| 1 | /* Ada language support routines for GDB, the GNU debugger. Copyright (C) |
| 2 | |
| 3 | 1992, 1993, 1994, 1997, 1998, 1999, 2000, 2003, 2004, 2005, 2007, 2008, |
| 4 | 2009 Free Software Foundation, Inc. |
| 5 | |
| 6 | This file is part of GDB. |
| 7 | |
| 8 | This program is free software; you can redistribute it and/or modify |
| 9 | it under the terms of the GNU General Public License as published by |
| 10 | the Free Software Foundation; either version 3 of the License, or |
| 11 | (at your option) any later version. |
| 12 | |
| 13 | This program is distributed in the hope that it will be useful, |
| 14 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 16 | GNU General Public License for more details. |
| 17 | |
| 18 | You should have received a copy of the GNU General Public License |
| 19 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
| 20 | |
| 21 | |
| 22 | #include "defs.h" |
| 23 | #include <stdio.h> |
| 24 | #include "gdb_string.h" |
| 25 | #include <ctype.h> |
| 26 | #include <stdarg.h> |
| 27 | #include "demangle.h" |
| 28 | #include "gdb_regex.h" |
| 29 | #include "frame.h" |
| 30 | #include "symtab.h" |
| 31 | #include "gdbtypes.h" |
| 32 | #include "gdbcmd.h" |
| 33 | #include "expression.h" |
| 34 | #include "parser-defs.h" |
| 35 | #include "language.h" |
| 36 | #include "c-lang.h" |
| 37 | #include "inferior.h" |
| 38 | #include "symfile.h" |
| 39 | #include "objfiles.h" |
| 40 | #include "breakpoint.h" |
| 41 | #include "gdbcore.h" |
| 42 | #include "hashtab.h" |
| 43 | #include "gdb_obstack.h" |
| 44 | #include "ada-lang.h" |
| 45 | #include "completer.h" |
| 46 | #include "gdb_stat.h" |
| 47 | #ifdef UI_OUT |
| 48 | #include "ui-out.h" |
| 49 | #endif |
| 50 | #include "block.h" |
| 51 | #include "infcall.h" |
| 52 | #include "dictionary.h" |
| 53 | #include "exceptions.h" |
| 54 | #include "annotate.h" |
| 55 | #include "valprint.h" |
| 56 | #include "source.h" |
| 57 | #include "observer.h" |
| 58 | #include "vec.h" |
| 59 | #include "stack.h" |
| 60 | |
| 61 | #include "psymtab.h" |
| 62 | #include "value.h" |
| 63 | #include "mi/mi-common.h" |
| 64 | |
| 65 | /* Define whether or not the C operator '/' truncates towards zero for |
| 66 | differently signed operands (truncation direction is undefined in C). |
| 67 | Copied from valarith.c. */ |
| 68 | |
| 69 | #ifndef TRUNCATION_TOWARDS_ZERO |
| 70 | #define TRUNCATION_TOWARDS_ZERO ((-5 / 2) == -2) |
| 71 | #endif |
| 72 | |
| 73 | static struct type *desc_base_type (struct type *); |
| 74 | |
| 75 | static struct type *desc_bounds_type (struct type *); |
| 76 | |
| 77 | static struct value *desc_bounds (struct value *); |
| 78 | |
| 79 | static int fat_pntr_bounds_bitpos (struct type *); |
| 80 | |
| 81 | static int fat_pntr_bounds_bitsize (struct type *); |
| 82 | |
| 83 | static struct type *desc_data_target_type (struct type *); |
| 84 | |
| 85 | static struct value *desc_data (struct value *); |
| 86 | |
| 87 | static int fat_pntr_data_bitpos (struct type *); |
| 88 | |
| 89 | static int fat_pntr_data_bitsize (struct type *); |
| 90 | |
| 91 | static struct value *desc_one_bound (struct value *, int, int); |
| 92 | |
| 93 | static int desc_bound_bitpos (struct type *, int, int); |
| 94 | |
| 95 | static int desc_bound_bitsize (struct type *, int, int); |
| 96 | |
| 97 | static struct type *desc_index_type (struct type *, int); |
| 98 | |
| 99 | static int desc_arity (struct type *); |
| 100 | |
| 101 | static int ada_type_match (struct type *, struct type *, int); |
| 102 | |
| 103 | static int ada_args_match (struct symbol *, struct value **, int); |
| 104 | |
| 105 | static int full_match (const char *, const char *); |
| 106 | |
| 107 | static struct value *make_array_descriptor (struct type *, struct value *); |
| 108 | |
| 109 | static void ada_add_block_symbols (struct obstack *, |
| 110 | struct block *, const char *, |
| 111 | domain_enum, struct objfile *, int); |
| 112 | |
| 113 | static int is_nonfunction (struct ada_symbol_info *, int); |
| 114 | |
| 115 | static void add_defn_to_vec (struct obstack *, struct symbol *, |
| 116 | struct block *); |
| 117 | |
| 118 | static int num_defns_collected (struct obstack *); |
| 119 | |
| 120 | static struct ada_symbol_info *defns_collected (struct obstack *, int); |
| 121 | |
| 122 | static struct value *resolve_subexp (struct expression **, int *, int, |
| 123 | struct type *); |
| 124 | |
| 125 | static void replace_operator_with_call (struct expression **, int, int, int, |
| 126 | struct symbol *, struct block *); |
| 127 | |
| 128 | static int possible_user_operator_p (enum exp_opcode, struct value **); |
| 129 | |
| 130 | static char *ada_op_name (enum exp_opcode); |
| 131 | |
| 132 | static const char *ada_decoded_op_name (enum exp_opcode); |
| 133 | |
| 134 | static int numeric_type_p (struct type *); |
| 135 | |
| 136 | static int integer_type_p (struct type *); |
| 137 | |
| 138 | static int scalar_type_p (struct type *); |
| 139 | |
| 140 | static int discrete_type_p (struct type *); |
| 141 | |
| 142 | static enum ada_renaming_category parse_old_style_renaming (struct type *, |
| 143 | const char **, |
| 144 | int *, |
| 145 | const char **); |
| 146 | |
| 147 | static struct symbol *find_old_style_renaming_symbol (const char *, |
| 148 | struct block *); |
| 149 | |
| 150 | static struct type *ada_lookup_struct_elt_type (struct type *, char *, |
| 151 | int, int, int *); |
| 152 | |
| 153 | static struct value *evaluate_subexp_type (struct expression *, int *); |
| 154 | |
| 155 | static struct type *ada_find_parallel_type_with_name (struct type *, |
| 156 | const char *); |
| 157 | |
| 158 | static int is_dynamic_field (struct type *, int); |
| 159 | |
| 160 | static struct type *to_fixed_variant_branch_type (struct type *, |
| 161 | const gdb_byte *, |
| 162 | CORE_ADDR, struct value *); |
| 163 | |
| 164 | static struct type *to_fixed_array_type (struct type *, struct value *, int); |
| 165 | |
| 166 | static struct type *to_fixed_range_type (struct type *, struct value *); |
| 167 | |
| 168 | static struct type *to_static_fixed_type (struct type *); |
| 169 | static struct type *static_unwrap_type (struct type *type); |
| 170 | |
| 171 | static struct value *unwrap_value (struct value *); |
| 172 | |
| 173 | static struct type *constrained_packed_array_type (struct type *, long *); |
| 174 | |
| 175 | static struct type *decode_constrained_packed_array_type (struct type *); |
| 176 | |
| 177 | static long decode_packed_array_bitsize (struct type *); |
| 178 | |
| 179 | static struct value *decode_constrained_packed_array (struct value *); |
| 180 | |
| 181 | static int ada_is_packed_array_type (struct type *); |
| 182 | |
| 183 | static int ada_is_unconstrained_packed_array_type (struct type *); |
| 184 | |
| 185 | static struct value *value_subscript_packed (struct value *, int, |
| 186 | struct value **); |
| 187 | |
| 188 | static void move_bits (gdb_byte *, int, const gdb_byte *, int, int, int); |
| 189 | |
| 190 | static struct value *coerce_unspec_val_to_type (struct value *, |
| 191 | struct type *); |
| 192 | |
| 193 | static struct value *get_var_value (char *, char *); |
| 194 | |
| 195 | static int lesseq_defined_than (struct symbol *, struct symbol *); |
| 196 | |
| 197 | static int equiv_types (struct type *, struct type *); |
| 198 | |
| 199 | static int is_name_suffix (const char *); |
| 200 | |
| 201 | static int advance_wild_match (const char **, const char *, int); |
| 202 | |
| 203 | static int wild_match (const char *, const char *); |
| 204 | |
| 205 | static struct value *ada_coerce_ref (struct value *); |
| 206 | |
| 207 | static LONGEST pos_atr (struct value *); |
| 208 | |
| 209 | static struct value *value_pos_atr (struct type *, struct value *); |
| 210 | |
| 211 | static struct value *value_val_atr (struct type *, struct value *); |
| 212 | |
| 213 | static struct symbol *standard_lookup (const char *, const struct block *, |
| 214 | domain_enum); |
| 215 | |
| 216 | static struct value *ada_search_struct_field (char *, struct value *, int, |
| 217 | struct type *); |
| 218 | |
| 219 | static struct value *ada_value_primitive_field (struct value *, int, int, |
| 220 | struct type *); |
| 221 | |
| 222 | static int find_struct_field (char *, struct type *, int, |
| 223 | struct type **, int *, int *, int *, int *); |
| 224 | |
| 225 | static struct value *ada_to_fixed_value_create (struct type *, CORE_ADDR, |
| 226 | struct value *); |
| 227 | |
| 228 | static int ada_resolve_function (struct ada_symbol_info *, int, |
| 229 | struct value **, int, const char *, |
| 230 | struct type *); |
| 231 | |
| 232 | static int ada_is_direct_array_type (struct type *); |
| 233 | |
| 234 | static void ada_language_arch_info (struct gdbarch *, |
| 235 | struct language_arch_info *); |
| 236 | |
| 237 | static void check_size (const struct type *); |
| 238 | |
| 239 | static struct value *ada_index_struct_field (int, struct value *, int, |
| 240 | struct type *); |
| 241 | |
| 242 | static struct value *assign_aggregate (struct value *, struct value *, |
| 243 | struct expression *, |
| 244 | int *, enum noside); |
| 245 | |
| 246 | static void aggregate_assign_from_choices (struct value *, struct value *, |
| 247 | struct expression *, |
| 248 | int *, LONGEST *, int *, |
| 249 | int, LONGEST, LONGEST); |
| 250 | |
| 251 | static void aggregate_assign_positional (struct value *, struct value *, |
| 252 | struct expression *, |
| 253 | int *, LONGEST *, int *, int, |
| 254 | LONGEST, LONGEST); |
| 255 | |
| 256 | |
| 257 | static void aggregate_assign_others (struct value *, struct value *, |
| 258 | struct expression *, |
| 259 | int *, LONGEST *, int, LONGEST, LONGEST); |
| 260 | |
| 261 | |
| 262 | static void add_component_interval (LONGEST, LONGEST, LONGEST *, int *, int); |
| 263 | |
| 264 | |
| 265 | static struct value *ada_evaluate_subexp (struct type *, struct expression *, |
| 266 | int *, enum noside); |
| 267 | |
| 268 | static void ada_forward_operator_length (struct expression *, int, int *, |
| 269 | int *); |
| 270 | \f |
| 271 | |
| 272 | |
| 273 | /* Maximum-sized dynamic type. */ |
| 274 | static unsigned int varsize_limit; |
| 275 | |
| 276 | /* FIXME: brobecker/2003-09-17: No longer a const because it is |
| 277 | returned by a function that does not return a const char *. */ |
| 278 | static char *ada_completer_word_break_characters = |
| 279 | #ifdef VMS |
| 280 | " \t\n!@#%^&*()+=|~`}{[]\";:?/,-"; |
| 281 | #else |
| 282 | " \t\n!@#$%^&*()+=|~`}{[]\";:?/,-"; |
| 283 | #endif |
| 284 | |
| 285 | /* The name of the symbol to use to get the name of the main subprogram. */ |
| 286 | static const char ADA_MAIN_PROGRAM_SYMBOL_NAME[] |
| 287 | = "__gnat_ada_main_program_name"; |
| 288 | |
| 289 | /* Limit on the number of warnings to raise per expression evaluation. */ |
| 290 | static int warning_limit = 2; |
| 291 | |
| 292 | /* Number of warning messages issued; reset to 0 by cleanups after |
| 293 | expression evaluation. */ |
| 294 | static int warnings_issued = 0; |
| 295 | |
| 296 | static const char *known_runtime_file_name_patterns[] = { |
| 297 | ADA_KNOWN_RUNTIME_FILE_NAME_PATTERNS NULL |
| 298 | }; |
| 299 | |
| 300 | static const char *known_auxiliary_function_name_patterns[] = { |
| 301 | ADA_KNOWN_AUXILIARY_FUNCTION_NAME_PATTERNS NULL |
| 302 | }; |
| 303 | |
| 304 | /* Space for allocating results of ada_lookup_symbol_list. */ |
| 305 | static struct obstack symbol_list_obstack; |
| 306 | |
| 307 | /* Inferior-specific data. */ |
| 308 | |
| 309 | /* Per-inferior data for this module. */ |
| 310 | |
| 311 | struct ada_inferior_data |
| 312 | { |
| 313 | /* The ada__tags__type_specific_data type, which is used when decoding |
| 314 | tagged types. With older versions of GNAT, this type was directly |
| 315 | accessible through a component ("tsd") in the object tag. But this |
| 316 | is no longer the case, so we cache it for each inferior. */ |
| 317 | struct type *tsd_type; |
| 318 | }; |
| 319 | |
| 320 | /* Our key to this module's inferior data. */ |
| 321 | static const struct inferior_data *ada_inferior_data; |
| 322 | |
| 323 | /* A cleanup routine for our inferior data. */ |
| 324 | static void |
| 325 | ada_inferior_data_cleanup (struct inferior *inf, void *arg) |
| 326 | { |
| 327 | struct ada_inferior_data *data; |
| 328 | |
| 329 | data = inferior_data (inf, ada_inferior_data); |
| 330 | if (data != NULL) |
| 331 | xfree (data); |
| 332 | } |
| 333 | |
| 334 | /* Return our inferior data for the given inferior (INF). |
| 335 | |
| 336 | This function always returns a valid pointer to an allocated |
| 337 | ada_inferior_data structure. If INF's inferior data has not |
| 338 | been previously set, this functions creates a new one with all |
| 339 | fields set to zero, sets INF's inferior to it, and then returns |
| 340 | a pointer to that newly allocated ada_inferior_data. */ |
| 341 | |
| 342 | static struct ada_inferior_data * |
| 343 | get_ada_inferior_data (struct inferior *inf) |
| 344 | { |
| 345 | struct ada_inferior_data *data; |
| 346 | |
| 347 | data = inferior_data (inf, ada_inferior_data); |
| 348 | if (data == NULL) |
| 349 | { |
| 350 | data = XZALLOC (struct ada_inferior_data); |
| 351 | set_inferior_data (inf, ada_inferior_data, data); |
| 352 | } |
| 353 | |
| 354 | return data; |
| 355 | } |
| 356 | |
| 357 | /* Perform all necessary cleanups regarding our module's inferior data |
| 358 | that is required after the inferior INF just exited. */ |
| 359 | |
| 360 | static void |
| 361 | ada_inferior_exit (struct inferior *inf) |
| 362 | { |
| 363 | ada_inferior_data_cleanup (inf, NULL); |
| 364 | set_inferior_data (inf, ada_inferior_data, NULL); |
| 365 | } |
| 366 | |
| 367 | /* Utilities */ |
| 368 | |
| 369 | /* If TYPE is a TYPE_CODE_TYPEDEF type, return the target type after |
| 370 | all typedef layers have been peeled. Otherwise, return TYPE. |
| 371 | |
| 372 | Normally, we really expect a typedef type to only have 1 typedef layer. |
| 373 | In other words, we really expect the target type of a typedef type to be |
| 374 | a non-typedef type. This is particularly true for Ada units, because |
| 375 | the language does not have a typedef vs not-typedef distinction. |
| 376 | In that respect, the Ada compiler has been trying to eliminate as many |
| 377 | typedef definitions in the debugging information, since they generally |
| 378 | do not bring any extra information (we still use typedef under certain |
| 379 | circumstances related mostly to the GNAT encoding). |
| 380 | |
| 381 | Unfortunately, we have seen situations where the debugging information |
| 382 | generated by the compiler leads to such multiple typedef layers. For |
| 383 | instance, consider the following example with stabs: |
| 384 | |
| 385 | .stabs "pck__float_array___XUP:Tt(0,46)=s16P_ARRAY:(0,47)=[...]"[...] |
| 386 | .stabs "pck__float_array___XUP:t(0,36)=(0,46)",128,0,6,0 |
| 387 | |
| 388 | This is an error in the debugging information which causes type |
| 389 | pck__float_array___XUP to be defined twice, and the second time, |
| 390 | it is defined as a typedef of a typedef. |
| 391 | |
| 392 | This is on the fringe of legality as far as debugging information is |
| 393 | concerned, and certainly unexpected. But it is easy to handle these |
| 394 | situations correctly, so we can afford to be lenient in this case. */ |
| 395 | |
| 396 | static struct type * |
| 397 | ada_typedef_target_type (struct type *type) |
| 398 | { |
| 399 | while (TYPE_CODE (type) == TYPE_CODE_TYPEDEF) |
| 400 | type = TYPE_TARGET_TYPE (type); |
| 401 | return type; |
| 402 | } |
| 403 | |
| 404 | /* Given DECODED_NAME a string holding a symbol name in its |
| 405 | decoded form (ie using the Ada dotted notation), returns |
| 406 | its unqualified name. */ |
| 407 | |
| 408 | static const char * |
| 409 | ada_unqualified_name (const char *decoded_name) |
| 410 | { |
| 411 | const char *result = strrchr (decoded_name, '.'); |
| 412 | |
| 413 | if (result != NULL) |
| 414 | result++; /* Skip the dot... */ |
| 415 | else |
| 416 | result = decoded_name; |
| 417 | |
| 418 | return result; |
| 419 | } |
| 420 | |
| 421 | /* Return a string starting with '<', followed by STR, and '>'. |
| 422 | The result is good until the next call. */ |
| 423 | |
| 424 | static char * |
| 425 | add_angle_brackets (const char *str) |
| 426 | { |
| 427 | static char *result = NULL; |
| 428 | |
| 429 | xfree (result); |
| 430 | result = xstrprintf ("<%s>", str); |
| 431 | return result; |
| 432 | } |
| 433 | |
| 434 | static char * |
| 435 | ada_get_gdb_completer_word_break_characters (void) |
| 436 | { |
| 437 | return ada_completer_word_break_characters; |
| 438 | } |
| 439 | |
| 440 | /* Print an array element index using the Ada syntax. */ |
| 441 | |
| 442 | static void |
| 443 | ada_print_array_index (struct value *index_value, struct ui_file *stream, |
| 444 | const struct value_print_options *options) |
| 445 | { |
| 446 | LA_VALUE_PRINT (index_value, stream, options); |
| 447 | fprintf_filtered (stream, " => "); |
| 448 | } |
| 449 | |
| 450 | /* Assuming VECT points to an array of *SIZE objects of size |
| 451 | ELEMENT_SIZE, grow it to contain at least MIN_SIZE objects, |
| 452 | updating *SIZE as necessary and returning the (new) array. */ |
| 453 | |
| 454 | void * |
| 455 | grow_vect (void *vect, size_t *size, size_t min_size, int element_size) |
| 456 | { |
| 457 | if (*size < min_size) |
| 458 | { |
| 459 | *size *= 2; |
| 460 | if (*size < min_size) |
| 461 | *size = min_size; |
| 462 | vect = xrealloc (vect, *size * element_size); |
| 463 | } |
| 464 | return vect; |
| 465 | } |
| 466 | |
| 467 | /* True (non-zero) iff TARGET matches FIELD_NAME up to any trailing |
| 468 | suffix of FIELD_NAME beginning "___". */ |
| 469 | |
| 470 | static int |
| 471 | field_name_match (const char *field_name, const char *target) |
| 472 | { |
| 473 | int len = strlen (target); |
| 474 | |
| 475 | return |
| 476 | (strncmp (field_name, target, len) == 0 |
| 477 | && (field_name[len] == '\0' |
| 478 | || (strncmp (field_name + len, "___", 3) == 0 |
| 479 | && strcmp (field_name + strlen (field_name) - 6, |
| 480 | "___XVN") != 0))); |
| 481 | } |
| 482 | |
| 483 | |
| 484 | /* Assuming TYPE is a TYPE_CODE_STRUCT or a TYPE_CODE_TYPDEF to |
| 485 | a TYPE_CODE_STRUCT, find the field whose name matches FIELD_NAME, |
| 486 | and return its index. This function also handles fields whose name |
| 487 | have ___ suffixes because the compiler sometimes alters their name |
| 488 | by adding such a suffix to represent fields with certain constraints. |
| 489 | If the field could not be found, return a negative number if |
| 490 | MAYBE_MISSING is set. Otherwise raise an error. */ |
| 491 | |
| 492 | int |
| 493 | ada_get_field_index (const struct type *type, const char *field_name, |
| 494 | int maybe_missing) |
| 495 | { |
| 496 | int fieldno; |
| 497 | struct type *struct_type = check_typedef ((struct type *) type); |
| 498 | |
| 499 | for (fieldno = 0; fieldno < TYPE_NFIELDS (struct_type); fieldno++) |
| 500 | if (field_name_match (TYPE_FIELD_NAME (struct_type, fieldno), field_name)) |
| 501 | return fieldno; |
| 502 | |
| 503 | if (!maybe_missing) |
| 504 | error (_("Unable to find field %s in struct %s. Aborting"), |
| 505 | field_name, TYPE_NAME (struct_type)); |
| 506 | |
| 507 | return -1; |
| 508 | } |
| 509 | |
| 510 | /* The length of the prefix of NAME prior to any "___" suffix. */ |
| 511 | |
| 512 | int |
| 513 | ada_name_prefix_len (const char *name) |
| 514 | { |
| 515 | if (name == NULL) |
| 516 | return 0; |
| 517 | else |
| 518 | { |
| 519 | const char *p = strstr (name, "___"); |
| 520 | |
| 521 | if (p == NULL) |
| 522 | return strlen (name); |
| 523 | else |
| 524 | return p - name; |
| 525 | } |
| 526 | } |
| 527 | |
| 528 | /* Return non-zero if SUFFIX is a suffix of STR. |
| 529 | Return zero if STR is null. */ |
| 530 | |
| 531 | static int |
| 532 | is_suffix (const char *str, const char *suffix) |
| 533 | { |
| 534 | int len1, len2; |
| 535 | |
| 536 | if (str == NULL) |
| 537 | return 0; |
| 538 | len1 = strlen (str); |
| 539 | len2 = strlen (suffix); |
| 540 | return (len1 >= len2 && strcmp (str + len1 - len2, suffix) == 0); |
| 541 | } |
| 542 | |
| 543 | /* The contents of value VAL, treated as a value of type TYPE. The |
| 544 | result is an lval in memory if VAL is. */ |
| 545 | |
| 546 | static struct value * |
| 547 | coerce_unspec_val_to_type (struct value *val, struct type *type) |
| 548 | { |
| 549 | type = ada_check_typedef (type); |
| 550 | if (value_type (val) == type) |
| 551 | return val; |
| 552 | else |
| 553 | { |
| 554 | struct value *result; |
| 555 | |
| 556 | /* Make sure that the object size is not unreasonable before |
| 557 | trying to allocate some memory for it. */ |
| 558 | check_size (type); |
| 559 | |
| 560 | if (value_lazy (val) |
| 561 | || TYPE_LENGTH (type) > TYPE_LENGTH (value_type (val))) |
| 562 | result = allocate_value_lazy (type); |
| 563 | else |
| 564 | { |
| 565 | result = allocate_value (type); |
| 566 | memcpy (value_contents_raw (result), value_contents (val), |
| 567 | TYPE_LENGTH (type)); |
| 568 | } |
| 569 | set_value_component_location (result, val); |
| 570 | set_value_bitsize (result, value_bitsize (val)); |
| 571 | set_value_bitpos (result, value_bitpos (val)); |
| 572 | set_value_address (result, value_address (val)); |
| 573 | return result; |
| 574 | } |
| 575 | } |
| 576 | |
| 577 | static const gdb_byte * |
| 578 | cond_offset_host (const gdb_byte *valaddr, long offset) |
| 579 | { |
| 580 | if (valaddr == NULL) |
| 581 | return NULL; |
| 582 | else |
| 583 | return valaddr + offset; |
| 584 | } |
| 585 | |
| 586 | static CORE_ADDR |
| 587 | cond_offset_target (CORE_ADDR address, long offset) |
| 588 | { |
| 589 | if (address == 0) |
| 590 | return 0; |
| 591 | else |
| 592 | return address + offset; |
| 593 | } |
| 594 | |
| 595 | /* Issue a warning (as for the definition of warning in utils.c, but |
| 596 | with exactly one argument rather than ...), unless the limit on the |
| 597 | number of warnings has passed during the evaluation of the current |
| 598 | expression. */ |
| 599 | |
| 600 | /* FIXME: cagney/2004-10-10: This function is mimicking the behavior |
| 601 | provided by "complaint". */ |
| 602 | static void lim_warning (const char *format, ...) ATTRIBUTE_PRINTF (1, 2); |
| 603 | |
| 604 | static void |
| 605 | lim_warning (const char *format, ...) |
| 606 | { |
| 607 | va_list args; |
| 608 | |
| 609 | va_start (args, format); |
| 610 | warnings_issued += 1; |
| 611 | if (warnings_issued <= warning_limit) |
| 612 | vwarning (format, args); |
| 613 | |
| 614 | va_end (args); |
| 615 | } |
| 616 | |
| 617 | /* Issue an error if the size of an object of type T is unreasonable, |
| 618 | i.e. if it would be a bad idea to allocate a value of this type in |
| 619 | GDB. */ |
| 620 | |
| 621 | static void |
| 622 | check_size (const struct type *type) |
| 623 | { |
| 624 | if (TYPE_LENGTH (type) > varsize_limit) |
| 625 | error (_("object size is larger than varsize-limit")); |
| 626 | } |
| 627 | |
| 628 | /* Maximum value of a SIZE-byte signed integer type. */ |
| 629 | static LONGEST |
| 630 | max_of_size (int size) |
| 631 | { |
| 632 | LONGEST top_bit = (LONGEST) 1 << (size * 8 - 2); |
| 633 | |
| 634 | return top_bit | (top_bit - 1); |
| 635 | } |
| 636 | |
| 637 | /* Minimum value of a SIZE-byte signed integer type. */ |
| 638 | static LONGEST |
| 639 | min_of_size (int size) |
| 640 | { |
| 641 | return -max_of_size (size) - 1; |
| 642 | } |
| 643 | |
| 644 | /* Maximum value of a SIZE-byte unsigned integer type. */ |
| 645 | static ULONGEST |
| 646 | umax_of_size (int size) |
| 647 | { |
| 648 | ULONGEST top_bit = (ULONGEST) 1 << (size * 8 - 1); |
| 649 | |
| 650 | return top_bit | (top_bit - 1); |
| 651 | } |
| 652 | |
| 653 | /* Maximum value of integral type T, as a signed quantity. */ |
| 654 | static LONGEST |
| 655 | max_of_type (struct type *t) |
| 656 | { |
| 657 | if (TYPE_UNSIGNED (t)) |
| 658 | return (LONGEST) umax_of_size (TYPE_LENGTH (t)); |
| 659 | else |
| 660 | return max_of_size (TYPE_LENGTH (t)); |
| 661 | } |
| 662 | |
| 663 | /* Minimum value of integral type T, as a signed quantity. */ |
| 664 | static LONGEST |
| 665 | min_of_type (struct type *t) |
| 666 | { |
| 667 | if (TYPE_UNSIGNED (t)) |
| 668 | return 0; |
| 669 | else |
| 670 | return min_of_size (TYPE_LENGTH (t)); |
| 671 | } |
| 672 | |
| 673 | /* The largest value in the domain of TYPE, a discrete type, as an integer. */ |
| 674 | LONGEST |
| 675 | ada_discrete_type_high_bound (struct type *type) |
| 676 | { |
| 677 | switch (TYPE_CODE (type)) |
| 678 | { |
| 679 | case TYPE_CODE_RANGE: |
| 680 | return TYPE_HIGH_BOUND (type); |
| 681 | case TYPE_CODE_ENUM: |
| 682 | return TYPE_FIELD_BITPOS (type, TYPE_NFIELDS (type) - 1); |
| 683 | case TYPE_CODE_BOOL: |
| 684 | return 1; |
| 685 | case TYPE_CODE_CHAR: |
| 686 | case TYPE_CODE_INT: |
| 687 | return max_of_type (type); |
| 688 | default: |
| 689 | error (_("Unexpected type in ada_discrete_type_high_bound.")); |
| 690 | } |
| 691 | } |
| 692 | |
| 693 | /* The largest value in the domain of TYPE, a discrete type, as an integer. */ |
| 694 | LONGEST |
| 695 | ada_discrete_type_low_bound (struct type *type) |
| 696 | { |
| 697 | switch (TYPE_CODE (type)) |
| 698 | { |
| 699 | case TYPE_CODE_RANGE: |
| 700 | return TYPE_LOW_BOUND (type); |
| 701 | case TYPE_CODE_ENUM: |
| 702 | return TYPE_FIELD_BITPOS (type, 0); |
| 703 | case TYPE_CODE_BOOL: |
| 704 | return 0; |
| 705 | case TYPE_CODE_CHAR: |
| 706 | case TYPE_CODE_INT: |
| 707 | return min_of_type (type); |
| 708 | default: |
| 709 | error (_("Unexpected type in ada_discrete_type_low_bound.")); |
| 710 | } |
| 711 | } |
| 712 | |
| 713 | /* The identity on non-range types. For range types, the underlying |
| 714 | non-range scalar type. */ |
| 715 | |
| 716 | static struct type * |
| 717 | base_type (struct type *type) |
| 718 | { |
| 719 | while (type != NULL && TYPE_CODE (type) == TYPE_CODE_RANGE) |
| 720 | { |
| 721 | if (type == TYPE_TARGET_TYPE (type) || TYPE_TARGET_TYPE (type) == NULL) |
| 722 | return type; |
| 723 | type = TYPE_TARGET_TYPE (type); |
| 724 | } |
| 725 | return type; |
| 726 | } |
| 727 | \f |
| 728 | |
| 729 | /* Language Selection */ |
| 730 | |
| 731 | /* If the main program is in Ada, return language_ada, otherwise return LANG |
| 732 | (the main program is in Ada iif the adainit symbol is found). */ |
| 733 | |
| 734 | enum language |
| 735 | ada_update_initial_language (enum language lang) |
| 736 | { |
| 737 | if (lookup_minimal_symbol ("adainit", (const char *) NULL, |
| 738 | (struct objfile *) NULL) != NULL) |
| 739 | return language_ada; |
| 740 | |
| 741 | return lang; |
| 742 | } |
| 743 | |
| 744 | /* If the main procedure is written in Ada, then return its name. |
| 745 | The result is good until the next call. Return NULL if the main |
| 746 | procedure doesn't appear to be in Ada. */ |
| 747 | |
| 748 | char * |
| 749 | ada_main_name (void) |
| 750 | { |
| 751 | struct minimal_symbol *msym; |
| 752 | static char *main_program_name = NULL; |
| 753 | |
| 754 | /* For Ada, the name of the main procedure is stored in a specific |
| 755 | string constant, generated by the binder. Look for that symbol, |
| 756 | extract its address, and then read that string. If we didn't find |
| 757 | that string, then most probably the main procedure is not written |
| 758 | in Ada. */ |
| 759 | msym = lookup_minimal_symbol (ADA_MAIN_PROGRAM_SYMBOL_NAME, NULL, NULL); |
| 760 | |
| 761 | if (msym != NULL) |
| 762 | { |
| 763 | CORE_ADDR main_program_name_addr; |
| 764 | int err_code; |
| 765 | |
| 766 | main_program_name_addr = SYMBOL_VALUE_ADDRESS (msym); |
| 767 | if (main_program_name_addr == 0) |
| 768 | error (_("Invalid address for Ada main program name.")); |
| 769 | |
| 770 | xfree (main_program_name); |
| 771 | target_read_string (main_program_name_addr, &main_program_name, |
| 772 | 1024, &err_code); |
| 773 | |
| 774 | if (err_code != 0) |
| 775 | return NULL; |
| 776 | return main_program_name; |
| 777 | } |
| 778 | |
| 779 | /* The main procedure doesn't seem to be in Ada. */ |
| 780 | return NULL; |
| 781 | } |
| 782 | \f |
| 783 | /* Symbols */ |
| 784 | |
| 785 | /* Table of Ada operators and their GNAT-encoded names. Last entry is pair |
| 786 | of NULLs. */ |
| 787 | |
| 788 | const struct ada_opname_map ada_opname_table[] = { |
| 789 | {"Oadd", "\"+\"", BINOP_ADD}, |
| 790 | {"Osubtract", "\"-\"", BINOP_SUB}, |
| 791 | {"Omultiply", "\"*\"", BINOP_MUL}, |
| 792 | {"Odivide", "\"/\"", BINOP_DIV}, |
| 793 | {"Omod", "\"mod\"", BINOP_MOD}, |
| 794 | {"Orem", "\"rem\"", BINOP_REM}, |
| 795 | {"Oexpon", "\"**\"", BINOP_EXP}, |
| 796 | {"Olt", "\"<\"", BINOP_LESS}, |
| 797 | {"Ole", "\"<=\"", BINOP_LEQ}, |
| 798 | {"Ogt", "\">\"", BINOP_GTR}, |
| 799 | {"Oge", "\">=\"", BINOP_GEQ}, |
| 800 | {"Oeq", "\"=\"", BINOP_EQUAL}, |
| 801 | {"One", "\"/=\"", BINOP_NOTEQUAL}, |
| 802 | {"Oand", "\"and\"", BINOP_BITWISE_AND}, |
| 803 | {"Oor", "\"or\"", BINOP_BITWISE_IOR}, |
| 804 | {"Oxor", "\"xor\"", BINOP_BITWISE_XOR}, |
| 805 | {"Oconcat", "\"&\"", BINOP_CONCAT}, |
| 806 | {"Oabs", "\"abs\"", UNOP_ABS}, |
| 807 | {"Onot", "\"not\"", UNOP_LOGICAL_NOT}, |
| 808 | {"Oadd", "\"+\"", UNOP_PLUS}, |
| 809 | {"Osubtract", "\"-\"", UNOP_NEG}, |
| 810 | {NULL, NULL} |
| 811 | }; |
| 812 | |
| 813 | /* The "encoded" form of DECODED, according to GNAT conventions. |
| 814 | The result is valid until the next call to ada_encode. */ |
| 815 | |
| 816 | char * |
| 817 | ada_encode (const char *decoded) |
| 818 | { |
| 819 | static char *encoding_buffer = NULL; |
| 820 | static size_t encoding_buffer_size = 0; |
| 821 | const char *p; |
| 822 | int k; |
| 823 | |
| 824 | if (decoded == NULL) |
| 825 | return NULL; |
| 826 | |
| 827 | GROW_VECT (encoding_buffer, encoding_buffer_size, |
| 828 | 2 * strlen (decoded) + 10); |
| 829 | |
| 830 | k = 0; |
| 831 | for (p = decoded; *p != '\0'; p += 1) |
| 832 | { |
| 833 | if (*p == '.') |
| 834 | { |
| 835 | encoding_buffer[k] = encoding_buffer[k + 1] = '_'; |
| 836 | k += 2; |
| 837 | } |
| 838 | else if (*p == '"') |
| 839 | { |
| 840 | const struct ada_opname_map *mapping; |
| 841 | |
| 842 | for (mapping = ada_opname_table; |
| 843 | mapping->encoded != NULL |
| 844 | && strncmp (mapping->decoded, p, |
| 845 | strlen (mapping->decoded)) != 0; mapping += 1) |
| 846 | ; |
| 847 | if (mapping->encoded == NULL) |
| 848 | error (_("invalid Ada operator name: %s"), p); |
| 849 | strcpy (encoding_buffer + k, mapping->encoded); |
| 850 | k += strlen (mapping->encoded); |
| 851 | break; |
| 852 | } |
| 853 | else |
| 854 | { |
| 855 | encoding_buffer[k] = *p; |
| 856 | k += 1; |
| 857 | } |
| 858 | } |
| 859 | |
| 860 | encoding_buffer[k] = '\0'; |
| 861 | return encoding_buffer; |
| 862 | } |
| 863 | |
| 864 | /* Return NAME folded to lower case, or, if surrounded by single |
| 865 | quotes, unfolded, but with the quotes stripped away. Result good |
| 866 | to next call. */ |
| 867 | |
| 868 | char * |
| 869 | ada_fold_name (const char *name) |
| 870 | { |
| 871 | static char *fold_buffer = NULL; |
| 872 | static size_t fold_buffer_size = 0; |
| 873 | |
| 874 | int len = strlen (name); |
| 875 | GROW_VECT (fold_buffer, fold_buffer_size, len + 1); |
| 876 | |
| 877 | if (name[0] == '\'') |
| 878 | { |
| 879 | strncpy (fold_buffer, name + 1, len - 2); |
| 880 | fold_buffer[len - 2] = '\000'; |
| 881 | } |
| 882 | else |
| 883 | { |
| 884 | int i; |
| 885 | |
| 886 | for (i = 0; i <= len; i += 1) |
| 887 | fold_buffer[i] = tolower (name[i]); |
| 888 | } |
| 889 | |
| 890 | return fold_buffer; |
| 891 | } |
| 892 | |
| 893 | /* Return nonzero if C is either a digit or a lowercase alphabet character. */ |
| 894 | |
| 895 | static int |
| 896 | is_lower_alphanum (const char c) |
| 897 | { |
| 898 | return (isdigit (c) || (isalpha (c) && islower (c))); |
| 899 | } |
| 900 | |
| 901 | /* Remove either of these suffixes: |
| 902 | . .{DIGIT}+ |
| 903 | . ${DIGIT}+ |
| 904 | . ___{DIGIT}+ |
| 905 | . __{DIGIT}+. |
| 906 | These are suffixes introduced by the compiler for entities such as |
| 907 | nested subprogram for instance, in order to avoid name clashes. |
| 908 | They do not serve any purpose for the debugger. */ |
| 909 | |
| 910 | static void |
| 911 | ada_remove_trailing_digits (const char *encoded, int *len) |
| 912 | { |
| 913 | if (*len > 1 && isdigit (encoded[*len - 1])) |
| 914 | { |
| 915 | int i = *len - 2; |
| 916 | |
| 917 | while (i > 0 && isdigit (encoded[i])) |
| 918 | i--; |
| 919 | if (i >= 0 && encoded[i] == '.') |
| 920 | *len = i; |
| 921 | else if (i >= 0 && encoded[i] == '$') |
| 922 | *len = i; |
| 923 | else if (i >= 2 && strncmp (encoded + i - 2, "___", 3) == 0) |
| 924 | *len = i - 2; |
| 925 | else if (i >= 1 && strncmp (encoded + i - 1, "__", 2) == 0) |
| 926 | *len = i - 1; |
| 927 | } |
| 928 | } |
| 929 | |
| 930 | /* Remove the suffix introduced by the compiler for protected object |
| 931 | subprograms. */ |
| 932 | |
| 933 | static void |
| 934 | ada_remove_po_subprogram_suffix (const char *encoded, int *len) |
| 935 | { |
| 936 | /* Remove trailing N. */ |
| 937 | |
| 938 | /* Protected entry subprograms are broken into two |
| 939 | separate subprograms: The first one is unprotected, and has |
| 940 | a 'N' suffix; the second is the protected version, and has |
| 941 | the 'P' suffix. The second calls the first one after handling |
| 942 | the protection. Since the P subprograms are internally generated, |
| 943 | we leave these names undecoded, giving the user a clue that this |
| 944 | entity is internal. */ |
| 945 | |
| 946 | if (*len > 1 |
| 947 | && encoded[*len - 1] == 'N' |
| 948 | && (isdigit (encoded[*len - 2]) || islower (encoded[*len - 2]))) |
| 949 | *len = *len - 1; |
| 950 | } |
| 951 | |
| 952 | /* Remove trailing X[bn]* suffixes (indicating names in package bodies). */ |
| 953 | |
| 954 | static void |
| 955 | ada_remove_Xbn_suffix (const char *encoded, int *len) |
| 956 | { |
| 957 | int i = *len - 1; |
| 958 | |
| 959 | while (i > 0 && (encoded[i] == 'b' || encoded[i] == 'n')) |
| 960 | i--; |
| 961 | |
| 962 | if (encoded[i] != 'X') |
| 963 | return; |
| 964 | |
| 965 | if (i == 0) |
| 966 | return; |
| 967 | |
| 968 | if (isalnum (encoded[i-1])) |
| 969 | *len = i; |
| 970 | } |
| 971 | |
| 972 | /* If ENCODED follows the GNAT entity encoding conventions, then return |
| 973 | the decoded form of ENCODED. Otherwise, return "<%s>" where "%s" is |
| 974 | replaced by ENCODED. |
| 975 | |
| 976 | The resulting string is valid until the next call of ada_decode. |
| 977 | If the string is unchanged by decoding, the original string pointer |
| 978 | is returned. */ |
| 979 | |
| 980 | const char * |
| 981 | ada_decode (const char *encoded) |
| 982 | { |
| 983 | int i, j; |
| 984 | int len0; |
| 985 | const char *p; |
| 986 | char *decoded; |
| 987 | int at_start_name; |
| 988 | static char *decoding_buffer = NULL; |
| 989 | static size_t decoding_buffer_size = 0; |
| 990 | |
| 991 | /* The name of the Ada main procedure starts with "_ada_". |
| 992 | This prefix is not part of the decoded name, so skip this part |
| 993 | if we see this prefix. */ |
| 994 | if (strncmp (encoded, "_ada_", 5) == 0) |
| 995 | encoded += 5; |
| 996 | |
| 997 | /* If the name starts with '_', then it is not a properly encoded |
| 998 | name, so do not attempt to decode it. Similarly, if the name |
| 999 | starts with '<', the name should not be decoded. */ |
| 1000 | if (encoded[0] == '_' || encoded[0] == '<') |
| 1001 | goto Suppress; |
| 1002 | |
| 1003 | len0 = strlen (encoded); |
| 1004 | |
| 1005 | ada_remove_trailing_digits (encoded, &len0); |
| 1006 | ada_remove_po_subprogram_suffix (encoded, &len0); |
| 1007 | |
| 1008 | /* Remove the ___X.* suffix if present. Do not forget to verify that |
| 1009 | the suffix is located before the current "end" of ENCODED. We want |
| 1010 | to avoid re-matching parts of ENCODED that have previously been |
| 1011 | marked as discarded (by decrementing LEN0). */ |
| 1012 | p = strstr (encoded, "___"); |
| 1013 | if (p != NULL && p - encoded < len0 - 3) |
| 1014 | { |
| 1015 | if (p[3] == 'X') |
| 1016 | len0 = p - encoded; |
| 1017 | else |
| 1018 | goto Suppress; |
| 1019 | } |
| 1020 | |
| 1021 | /* Remove any trailing TKB suffix. It tells us that this symbol |
| 1022 | is for the body of a task, but that information does not actually |
| 1023 | appear in the decoded name. */ |
| 1024 | |
| 1025 | if (len0 > 3 && strncmp (encoded + len0 - 3, "TKB", 3) == 0) |
| 1026 | len0 -= 3; |
| 1027 | |
| 1028 | /* Remove any trailing TB suffix. The TB suffix is slightly different |
| 1029 | from the TKB suffix because it is used for non-anonymous task |
| 1030 | bodies. */ |
| 1031 | |
| 1032 | if (len0 > 2 && strncmp (encoded + len0 - 2, "TB", 2) == 0) |
| 1033 | len0 -= 2; |
| 1034 | |
| 1035 | /* Remove trailing "B" suffixes. */ |
| 1036 | /* FIXME: brobecker/2006-04-19: Not sure what this are used for... */ |
| 1037 | |
| 1038 | if (len0 > 1 && strncmp (encoded + len0 - 1, "B", 1) == 0) |
| 1039 | len0 -= 1; |
| 1040 | |
| 1041 | /* Make decoded big enough for possible expansion by operator name. */ |
| 1042 | |
| 1043 | GROW_VECT (decoding_buffer, decoding_buffer_size, 2 * len0 + 1); |
| 1044 | decoded = decoding_buffer; |
| 1045 | |
| 1046 | /* Remove trailing __{digit}+ or trailing ${digit}+. */ |
| 1047 | |
| 1048 | if (len0 > 1 && isdigit (encoded[len0 - 1])) |
| 1049 | { |
| 1050 | i = len0 - 2; |
| 1051 | while ((i >= 0 && isdigit (encoded[i])) |
| 1052 | || (i >= 1 && encoded[i] == '_' && isdigit (encoded[i - 1]))) |
| 1053 | i -= 1; |
| 1054 | if (i > 1 && encoded[i] == '_' && encoded[i - 1] == '_') |
| 1055 | len0 = i - 1; |
| 1056 | else if (encoded[i] == '$') |
| 1057 | len0 = i; |
| 1058 | } |
| 1059 | |
| 1060 | /* The first few characters that are not alphabetic are not part |
| 1061 | of any encoding we use, so we can copy them over verbatim. */ |
| 1062 | |
| 1063 | for (i = 0, j = 0; i < len0 && !isalpha (encoded[i]); i += 1, j += 1) |
| 1064 | decoded[j] = encoded[i]; |
| 1065 | |
| 1066 | at_start_name = 1; |
| 1067 | while (i < len0) |
| 1068 | { |
| 1069 | /* Is this a symbol function? */ |
| 1070 | if (at_start_name && encoded[i] == 'O') |
| 1071 | { |
| 1072 | int k; |
| 1073 | |
| 1074 | for (k = 0; ada_opname_table[k].encoded != NULL; k += 1) |
| 1075 | { |
| 1076 | int op_len = strlen (ada_opname_table[k].encoded); |
| 1077 | if ((strncmp (ada_opname_table[k].encoded + 1, encoded + i + 1, |
| 1078 | op_len - 1) == 0) |
| 1079 | && !isalnum (encoded[i + op_len])) |
| 1080 | { |
| 1081 | strcpy (decoded + j, ada_opname_table[k].decoded); |
| 1082 | at_start_name = 0; |
| 1083 | i += op_len; |
| 1084 | j += strlen (ada_opname_table[k].decoded); |
| 1085 | break; |
| 1086 | } |
| 1087 | } |
| 1088 | if (ada_opname_table[k].encoded != NULL) |
| 1089 | continue; |
| 1090 | } |
| 1091 | at_start_name = 0; |
| 1092 | |
| 1093 | /* Replace "TK__" with "__", which will eventually be translated |
| 1094 | into "." (just below). */ |
| 1095 | |
| 1096 | if (i < len0 - 4 && strncmp (encoded + i, "TK__", 4) == 0) |
| 1097 | i += 2; |
| 1098 | |
| 1099 | /* Replace "__B_{DIGITS}+__" sequences by "__", which will eventually |
| 1100 | be translated into "." (just below). These are internal names |
| 1101 | generated for anonymous blocks inside which our symbol is nested. */ |
| 1102 | |
| 1103 | if (len0 - i > 5 && encoded [i] == '_' && encoded [i+1] == '_' |
| 1104 | && encoded [i+2] == 'B' && encoded [i+3] == '_' |
| 1105 | && isdigit (encoded [i+4])) |
| 1106 | { |
| 1107 | int k = i + 5; |
| 1108 | |
| 1109 | while (k < len0 && isdigit (encoded[k])) |
| 1110 | k++; /* Skip any extra digit. */ |
| 1111 | |
| 1112 | /* Double-check that the "__B_{DIGITS}+" sequence we found |
| 1113 | is indeed followed by "__". */ |
| 1114 | if (len0 - k > 2 && encoded [k] == '_' && encoded [k+1] == '_') |
| 1115 | i = k; |
| 1116 | } |
| 1117 | |
| 1118 | /* Remove _E{DIGITS}+[sb] */ |
| 1119 | |
| 1120 | /* Just as for protected object subprograms, there are 2 categories |
| 1121 | of subprograms created by the compiler for each entry. The first |
| 1122 | one implements the actual entry code, and has a suffix following |
| 1123 | the convention above; the second one implements the barrier and |
| 1124 | uses the same convention as above, except that the 'E' is replaced |
| 1125 | by a 'B'. |
| 1126 | |
| 1127 | Just as above, we do not decode the name of barrier functions |
| 1128 | to give the user a clue that the code he is debugging has been |
| 1129 | internally generated. */ |
| 1130 | |
| 1131 | if (len0 - i > 3 && encoded [i] == '_' && encoded[i+1] == 'E' |
| 1132 | && isdigit (encoded[i+2])) |
| 1133 | { |
| 1134 | int k = i + 3; |
| 1135 | |
| 1136 | while (k < len0 && isdigit (encoded[k])) |
| 1137 | k++; |
| 1138 | |
| 1139 | if (k < len0 |
| 1140 | && (encoded[k] == 'b' || encoded[k] == 's')) |
| 1141 | { |
| 1142 | k++; |
| 1143 | /* Just as an extra precaution, make sure that if this |
| 1144 | suffix is followed by anything else, it is a '_'. |
| 1145 | Otherwise, we matched this sequence by accident. */ |
| 1146 | if (k == len0 |
| 1147 | || (k < len0 && encoded[k] == '_')) |
| 1148 | i = k; |
| 1149 | } |
| 1150 | } |
| 1151 | |
| 1152 | /* Remove trailing "N" in [a-z0-9]+N__. The N is added by |
| 1153 | the GNAT front-end in protected object subprograms. */ |
| 1154 | |
| 1155 | if (i < len0 + 3 |
| 1156 | && encoded[i] == 'N' && encoded[i+1] == '_' && encoded[i+2] == '_') |
| 1157 | { |
| 1158 | /* Backtrack a bit up until we reach either the begining of |
| 1159 | the encoded name, or "__". Make sure that we only find |
| 1160 | digits or lowercase characters. */ |
| 1161 | const char *ptr = encoded + i - 1; |
| 1162 | |
| 1163 | while (ptr >= encoded && is_lower_alphanum (ptr[0])) |
| 1164 | ptr--; |
| 1165 | if (ptr < encoded |
| 1166 | || (ptr > encoded && ptr[0] == '_' && ptr[-1] == '_')) |
| 1167 | i++; |
| 1168 | } |
| 1169 | |
| 1170 | if (encoded[i] == 'X' && i != 0 && isalnum (encoded[i - 1])) |
| 1171 | { |
| 1172 | /* This is a X[bn]* sequence not separated from the previous |
| 1173 | part of the name with a non-alpha-numeric character (in other |
| 1174 | words, immediately following an alpha-numeric character), then |
| 1175 | verify that it is placed at the end of the encoded name. If |
| 1176 | not, then the encoding is not valid and we should abort the |
| 1177 | decoding. Otherwise, just skip it, it is used in body-nested |
| 1178 | package names. */ |
| 1179 | do |
| 1180 | i += 1; |
| 1181 | while (i < len0 && (encoded[i] == 'b' || encoded[i] == 'n')); |
| 1182 | if (i < len0) |
| 1183 | goto Suppress; |
| 1184 | } |
| 1185 | else if (i < len0 - 2 && encoded[i] == '_' && encoded[i + 1] == '_') |
| 1186 | { |
| 1187 | /* Replace '__' by '.'. */ |
| 1188 | decoded[j] = '.'; |
| 1189 | at_start_name = 1; |
| 1190 | i += 2; |
| 1191 | j += 1; |
| 1192 | } |
| 1193 | else |
| 1194 | { |
| 1195 | /* It's a character part of the decoded name, so just copy it |
| 1196 | over. */ |
| 1197 | decoded[j] = encoded[i]; |
| 1198 | i += 1; |
| 1199 | j += 1; |
| 1200 | } |
| 1201 | } |
| 1202 | decoded[j] = '\000'; |
| 1203 | |
| 1204 | /* Decoded names should never contain any uppercase character. |
| 1205 | Double-check this, and abort the decoding if we find one. */ |
| 1206 | |
| 1207 | for (i = 0; decoded[i] != '\0'; i += 1) |
| 1208 | if (isupper (decoded[i]) || decoded[i] == ' ') |
| 1209 | goto Suppress; |
| 1210 | |
| 1211 | if (strcmp (decoded, encoded) == 0) |
| 1212 | return encoded; |
| 1213 | else |
| 1214 | return decoded; |
| 1215 | |
| 1216 | Suppress: |
| 1217 | GROW_VECT (decoding_buffer, decoding_buffer_size, strlen (encoded) + 3); |
| 1218 | decoded = decoding_buffer; |
| 1219 | if (encoded[0] == '<') |
| 1220 | strcpy (decoded, encoded); |
| 1221 | else |
| 1222 | xsnprintf (decoded, decoding_buffer_size, "<%s>", encoded); |
| 1223 | return decoded; |
| 1224 | |
| 1225 | } |
| 1226 | |
| 1227 | /* Table for keeping permanent unique copies of decoded names. Once |
| 1228 | allocated, names in this table are never released. While this is a |
| 1229 | storage leak, it should not be significant unless there are massive |
| 1230 | changes in the set of decoded names in successive versions of a |
| 1231 | symbol table loaded during a single session. */ |
| 1232 | static struct htab *decoded_names_store; |
| 1233 | |
| 1234 | /* Returns the decoded name of GSYMBOL, as for ada_decode, caching it |
| 1235 | in the language-specific part of GSYMBOL, if it has not been |
| 1236 | previously computed. Tries to save the decoded name in the same |
| 1237 | obstack as GSYMBOL, if possible, and otherwise on the heap (so that, |
| 1238 | in any case, the decoded symbol has a lifetime at least that of |
| 1239 | GSYMBOL). |
| 1240 | The GSYMBOL parameter is "mutable" in the C++ sense: logically |
| 1241 | const, but nevertheless modified to a semantically equivalent form |
| 1242 | when a decoded name is cached in it. */ |
| 1243 | |
| 1244 | char * |
| 1245 | ada_decode_symbol (const struct general_symbol_info *gsymbol) |
| 1246 | { |
| 1247 | char **resultp = |
| 1248 | (char **) &gsymbol->language_specific.mangled_lang.demangled_name; |
| 1249 | |
| 1250 | if (*resultp == NULL) |
| 1251 | { |
| 1252 | const char *decoded = ada_decode (gsymbol->name); |
| 1253 | |
| 1254 | if (gsymbol->obj_section != NULL) |
| 1255 | { |
| 1256 | struct objfile *objf = gsymbol->obj_section->objfile; |
| 1257 | |
| 1258 | *resultp = obsavestring (decoded, strlen (decoded), |
| 1259 | &objf->objfile_obstack); |
| 1260 | } |
| 1261 | /* Sometimes, we can't find a corresponding objfile, in which |
| 1262 | case, we put the result on the heap. Since we only decode |
| 1263 | when needed, we hope this usually does not cause a |
| 1264 | significant memory leak (FIXME). */ |
| 1265 | if (*resultp == NULL) |
| 1266 | { |
| 1267 | char **slot = (char **) htab_find_slot (decoded_names_store, |
| 1268 | decoded, INSERT); |
| 1269 | |
| 1270 | if (*slot == NULL) |
| 1271 | *slot = xstrdup (decoded); |
| 1272 | *resultp = *slot; |
| 1273 | } |
| 1274 | } |
| 1275 | |
| 1276 | return *resultp; |
| 1277 | } |
| 1278 | |
| 1279 | static char * |
| 1280 | ada_la_decode (const char *encoded, int options) |
| 1281 | { |
| 1282 | return xstrdup (ada_decode (encoded)); |
| 1283 | } |
| 1284 | |
| 1285 | /* Returns non-zero iff SYM_NAME matches NAME, ignoring any trailing |
| 1286 | suffixes that encode debugging information or leading _ada_ on |
| 1287 | SYM_NAME (see is_name_suffix commentary for the debugging |
| 1288 | information that is ignored). If WILD, then NAME need only match a |
| 1289 | suffix of SYM_NAME minus the same suffixes. Also returns 0 if |
| 1290 | either argument is NULL. */ |
| 1291 | |
| 1292 | static int |
| 1293 | match_name (const char *sym_name, const char *name, int wild) |
| 1294 | { |
| 1295 | if (sym_name == NULL || name == NULL) |
| 1296 | return 0; |
| 1297 | else if (wild) |
| 1298 | return wild_match (sym_name, name) == 0; |
| 1299 | else |
| 1300 | { |
| 1301 | int len_name = strlen (name); |
| 1302 | |
| 1303 | return (strncmp (sym_name, name, len_name) == 0 |
| 1304 | && is_name_suffix (sym_name + len_name)) |
| 1305 | || (strncmp (sym_name, "_ada_", 5) == 0 |
| 1306 | && strncmp (sym_name + 5, name, len_name) == 0 |
| 1307 | && is_name_suffix (sym_name + len_name + 5)); |
| 1308 | } |
| 1309 | } |
| 1310 | \f |
| 1311 | |
| 1312 | /* Arrays */ |
| 1313 | |
| 1314 | /* Assuming that INDEX_DESC_TYPE is an ___XA structure, a structure |
| 1315 | generated by the GNAT compiler to describe the index type used |
| 1316 | for each dimension of an array, check whether it follows the latest |
| 1317 | known encoding. If not, fix it up to conform to the latest encoding. |
| 1318 | Otherwise, do nothing. This function also does nothing if |
| 1319 | INDEX_DESC_TYPE is NULL. |
| 1320 | |
| 1321 | The GNAT encoding used to describle the array index type evolved a bit. |
| 1322 | Initially, the information would be provided through the name of each |
| 1323 | field of the structure type only, while the type of these fields was |
| 1324 | described as unspecified and irrelevant. The debugger was then expected |
| 1325 | to perform a global type lookup using the name of that field in order |
| 1326 | to get access to the full index type description. Because these global |
| 1327 | lookups can be very expensive, the encoding was later enhanced to make |
| 1328 | the global lookup unnecessary by defining the field type as being |
| 1329 | the full index type description. |
| 1330 | |
| 1331 | The purpose of this routine is to allow us to support older versions |
| 1332 | of the compiler by detecting the use of the older encoding, and by |
| 1333 | fixing up the INDEX_DESC_TYPE to follow the new one (at this point, |
| 1334 | we essentially replace each field's meaningless type by the associated |
| 1335 | index subtype). */ |
| 1336 | |
| 1337 | void |
| 1338 | ada_fixup_array_indexes_type (struct type *index_desc_type) |
| 1339 | { |
| 1340 | int i; |
| 1341 | |
| 1342 | if (index_desc_type == NULL) |
| 1343 | return; |
| 1344 | gdb_assert (TYPE_NFIELDS (index_desc_type) > 0); |
| 1345 | |
| 1346 | /* Check if INDEX_DESC_TYPE follows the older encoding (it is sufficient |
| 1347 | to check one field only, no need to check them all). If not, return |
| 1348 | now. |
| 1349 | |
| 1350 | If our INDEX_DESC_TYPE was generated using the older encoding, |
| 1351 | the field type should be a meaningless integer type whose name |
| 1352 | is not equal to the field name. */ |
| 1353 | if (TYPE_NAME (TYPE_FIELD_TYPE (index_desc_type, 0)) != NULL |
| 1354 | && strcmp (TYPE_NAME (TYPE_FIELD_TYPE (index_desc_type, 0)), |
| 1355 | TYPE_FIELD_NAME (index_desc_type, 0)) == 0) |
| 1356 | return; |
| 1357 | |
| 1358 | /* Fixup each field of INDEX_DESC_TYPE. */ |
| 1359 | for (i = 0; i < TYPE_NFIELDS (index_desc_type); i++) |
| 1360 | { |
| 1361 | char *name = TYPE_FIELD_NAME (index_desc_type, i); |
| 1362 | struct type *raw_type = ada_check_typedef (ada_find_any_type (name)); |
| 1363 | |
| 1364 | if (raw_type) |
| 1365 | TYPE_FIELD_TYPE (index_desc_type, i) = raw_type; |
| 1366 | } |
| 1367 | } |
| 1368 | |
| 1369 | /* Names of MAX_ADA_DIMENS bounds in P_BOUNDS fields of array descriptors. */ |
| 1370 | |
| 1371 | static char *bound_name[] = { |
| 1372 | "LB0", "UB0", "LB1", "UB1", "LB2", "UB2", "LB3", "UB3", |
| 1373 | "LB4", "UB4", "LB5", "UB5", "LB6", "UB6", "LB7", "UB7" |
| 1374 | }; |
| 1375 | |
| 1376 | /* Maximum number of array dimensions we are prepared to handle. */ |
| 1377 | |
| 1378 | #define MAX_ADA_DIMENS (sizeof(bound_name) / (2*sizeof(char *))) |
| 1379 | |
| 1380 | |
| 1381 | /* The desc_* routines return primitive portions of array descriptors |
| 1382 | (fat pointers). */ |
| 1383 | |
| 1384 | /* The descriptor or array type, if any, indicated by TYPE; removes |
| 1385 | level of indirection, if needed. */ |
| 1386 | |
| 1387 | static struct type * |
| 1388 | desc_base_type (struct type *type) |
| 1389 | { |
| 1390 | if (type == NULL) |
| 1391 | return NULL; |
| 1392 | type = ada_check_typedef (type); |
| 1393 | if (TYPE_CODE (type) == TYPE_CODE_TYPEDEF) |
| 1394 | type = ada_typedef_target_type (type); |
| 1395 | |
| 1396 | if (type != NULL |
| 1397 | && (TYPE_CODE (type) == TYPE_CODE_PTR |
| 1398 | || TYPE_CODE (type) == TYPE_CODE_REF)) |
| 1399 | return ada_check_typedef (TYPE_TARGET_TYPE (type)); |
| 1400 | else |
| 1401 | return type; |
| 1402 | } |
| 1403 | |
| 1404 | /* True iff TYPE indicates a "thin" array pointer type. */ |
| 1405 | |
| 1406 | static int |
| 1407 | is_thin_pntr (struct type *type) |
| 1408 | { |
| 1409 | return |
| 1410 | is_suffix (ada_type_name (desc_base_type (type)), "___XUT") |
| 1411 | || is_suffix (ada_type_name (desc_base_type (type)), "___XUT___XVE"); |
| 1412 | } |
| 1413 | |
| 1414 | /* The descriptor type for thin pointer type TYPE. */ |
| 1415 | |
| 1416 | static struct type * |
| 1417 | thin_descriptor_type (struct type *type) |
| 1418 | { |
| 1419 | struct type *base_type = desc_base_type (type); |
| 1420 | |
| 1421 | if (base_type == NULL) |
| 1422 | return NULL; |
| 1423 | if (is_suffix (ada_type_name (base_type), "___XVE")) |
| 1424 | return base_type; |
| 1425 | else |
| 1426 | { |
| 1427 | struct type *alt_type = ada_find_parallel_type (base_type, "___XVE"); |
| 1428 | |
| 1429 | if (alt_type == NULL) |
| 1430 | return base_type; |
| 1431 | else |
| 1432 | return alt_type; |
| 1433 | } |
| 1434 | } |
| 1435 | |
| 1436 | /* A pointer to the array data for thin-pointer value VAL. */ |
| 1437 | |
| 1438 | static struct value * |
| 1439 | thin_data_pntr (struct value *val) |
| 1440 | { |
| 1441 | struct type *type = value_type (val); |
| 1442 | struct type *data_type = desc_data_target_type (thin_descriptor_type (type)); |
| 1443 | |
| 1444 | data_type = lookup_pointer_type (data_type); |
| 1445 | |
| 1446 | if (TYPE_CODE (type) == TYPE_CODE_PTR) |
| 1447 | return value_cast (data_type, value_copy (val)); |
| 1448 | else |
| 1449 | return value_from_longest (data_type, value_address (val)); |
| 1450 | } |
| 1451 | |
| 1452 | /* True iff TYPE indicates a "thick" array pointer type. */ |
| 1453 | |
| 1454 | static int |
| 1455 | is_thick_pntr (struct type *type) |
| 1456 | { |
| 1457 | type = desc_base_type (type); |
| 1458 | return (type != NULL && TYPE_CODE (type) == TYPE_CODE_STRUCT |
| 1459 | && lookup_struct_elt_type (type, "P_BOUNDS", 1) != NULL); |
| 1460 | } |
| 1461 | |
| 1462 | /* If TYPE is the type of an array descriptor (fat or thin pointer) or a |
| 1463 | pointer to one, the type of its bounds data; otherwise, NULL. */ |
| 1464 | |
| 1465 | static struct type * |
| 1466 | desc_bounds_type (struct type *type) |
| 1467 | { |
| 1468 | struct type *r; |
| 1469 | |
| 1470 | type = desc_base_type (type); |
| 1471 | |
| 1472 | if (type == NULL) |
| 1473 | return NULL; |
| 1474 | else if (is_thin_pntr (type)) |
| 1475 | { |
| 1476 | type = thin_descriptor_type (type); |
| 1477 | if (type == NULL) |
| 1478 | return NULL; |
| 1479 | r = lookup_struct_elt_type (type, "BOUNDS", 1); |
| 1480 | if (r != NULL) |
| 1481 | return ada_check_typedef (r); |
| 1482 | } |
| 1483 | else if (TYPE_CODE (type) == TYPE_CODE_STRUCT) |
| 1484 | { |
| 1485 | r = lookup_struct_elt_type (type, "P_BOUNDS", 1); |
| 1486 | if (r != NULL) |
| 1487 | return ada_check_typedef (TYPE_TARGET_TYPE (ada_check_typedef (r))); |
| 1488 | } |
| 1489 | return NULL; |
| 1490 | } |
| 1491 | |
| 1492 | /* If ARR is an array descriptor (fat or thin pointer), or pointer to |
| 1493 | one, a pointer to its bounds data. Otherwise NULL. */ |
| 1494 | |
| 1495 | static struct value * |
| 1496 | desc_bounds (struct value *arr) |
| 1497 | { |
| 1498 | struct type *type = ada_check_typedef (value_type (arr)); |
| 1499 | |
| 1500 | if (is_thin_pntr (type)) |
| 1501 | { |
| 1502 | struct type *bounds_type = |
| 1503 | desc_bounds_type (thin_descriptor_type (type)); |
| 1504 | LONGEST addr; |
| 1505 | |
| 1506 | if (bounds_type == NULL) |
| 1507 | error (_("Bad GNAT array descriptor")); |
| 1508 | |
| 1509 | /* NOTE: The following calculation is not really kosher, but |
| 1510 | since desc_type is an XVE-encoded type (and shouldn't be), |
| 1511 | the correct calculation is a real pain. FIXME (and fix GCC). */ |
| 1512 | if (TYPE_CODE (type) == TYPE_CODE_PTR) |
| 1513 | addr = value_as_long (arr); |
| 1514 | else |
| 1515 | addr = value_address (arr); |
| 1516 | |
| 1517 | return |
| 1518 | value_from_longest (lookup_pointer_type (bounds_type), |
| 1519 | addr - TYPE_LENGTH (bounds_type)); |
| 1520 | } |
| 1521 | |
| 1522 | else if (is_thick_pntr (type)) |
| 1523 | { |
| 1524 | struct value *p_bounds = value_struct_elt (&arr, NULL, "P_BOUNDS", NULL, |
| 1525 | _("Bad GNAT array descriptor")); |
| 1526 | struct type *p_bounds_type = value_type (p_bounds); |
| 1527 | |
| 1528 | if (p_bounds_type |
| 1529 | && TYPE_CODE (p_bounds_type) == TYPE_CODE_PTR) |
| 1530 | { |
| 1531 | struct type *target_type = TYPE_TARGET_TYPE (p_bounds_type); |
| 1532 | |
| 1533 | if (TYPE_STUB (target_type)) |
| 1534 | p_bounds = value_cast (lookup_pointer_type |
| 1535 | (ada_check_typedef (target_type)), |
| 1536 | p_bounds); |
| 1537 | } |
| 1538 | else |
| 1539 | error (_("Bad GNAT array descriptor")); |
| 1540 | |
| 1541 | return p_bounds; |
| 1542 | } |
| 1543 | else |
| 1544 | return NULL; |
| 1545 | } |
| 1546 | |
| 1547 | /* If TYPE is the type of an array-descriptor (fat pointer), the bit |
| 1548 | position of the field containing the address of the bounds data. */ |
| 1549 | |
| 1550 | static int |
| 1551 | fat_pntr_bounds_bitpos (struct type *type) |
| 1552 | { |
| 1553 | return TYPE_FIELD_BITPOS (desc_base_type (type), 1); |
| 1554 | } |
| 1555 | |
| 1556 | /* If TYPE is the type of an array-descriptor (fat pointer), the bit |
| 1557 | size of the field containing the address of the bounds data. */ |
| 1558 | |
| 1559 | static int |
| 1560 | fat_pntr_bounds_bitsize (struct type *type) |
| 1561 | { |
| 1562 | type = desc_base_type (type); |
| 1563 | |
| 1564 | if (TYPE_FIELD_BITSIZE (type, 1) > 0) |
| 1565 | return TYPE_FIELD_BITSIZE (type, 1); |
| 1566 | else |
| 1567 | return 8 * TYPE_LENGTH (ada_check_typedef (TYPE_FIELD_TYPE (type, 1))); |
| 1568 | } |
| 1569 | |
| 1570 | /* If TYPE is the type of an array descriptor (fat or thin pointer) or a |
| 1571 | pointer to one, the type of its array data (a array-with-no-bounds type); |
| 1572 | otherwise, NULL. Use ada_type_of_array to get an array type with bounds |
| 1573 | data. */ |
| 1574 | |
| 1575 | static struct type * |
| 1576 | desc_data_target_type (struct type *type) |
| 1577 | { |
| 1578 | type = desc_base_type (type); |
| 1579 | |
| 1580 | /* NOTE: The following is bogus; see comment in desc_bounds. */ |
| 1581 | if (is_thin_pntr (type)) |
| 1582 | return desc_base_type (TYPE_FIELD_TYPE (thin_descriptor_type (type), 1)); |
| 1583 | else if (is_thick_pntr (type)) |
| 1584 | { |
| 1585 | struct type *data_type = lookup_struct_elt_type (type, "P_ARRAY", 1); |
| 1586 | |
| 1587 | if (data_type |
| 1588 | && TYPE_CODE (ada_check_typedef (data_type)) == TYPE_CODE_PTR) |
| 1589 | return ada_check_typedef (TYPE_TARGET_TYPE (data_type)); |
| 1590 | } |
| 1591 | |
| 1592 | return NULL; |
| 1593 | } |
| 1594 | |
| 1595 | /* If ARR is an array descriptor (fat or thin pointer), a pointer to |
| 1596 | its array data. */ |
| 1597 | |
| 1598 | static struct value * |
| 1599 | desc_data (struct value *arr) |
| 1600 | { |
| 1601 | struct type *type = value_type (arr); |
| 1602 | |
| 1603 | if (is_thin_pntr (type)) |
| 1604 | return thin_data_pntr (arr); |
| 1605 | else if (is_thick_pntr (type)) |
| 1606 | return value_struct_elt (&arr, NULL, "P_ARRAY", NULL, |
| 1607 | _("Bad GNAT array descriptor")); |
| 1608 | else |
| 1609 | return NULL; |
| 1610 | } |
| 1611 | |
| 1612 | |
| 1613 | /* If TYPE is the type of an array-descriptor (fat pointer), the bit |
| 1614 | position of the field containing the address of the data. */ |
| 1615 | |
| 1616 | static int |
| 1617 | fat_pntr_data_bitpos (struct type *type) |
| 1618 | { |
| 1619 | return TYPE_FIELD_BITPOS (desc_base_type (type), 0); |
| 1620 | } |
| 1621 | |
| 1622 | /* If TYPE is the type of an array-descriptor (fat pointer), the bit |
| 1623 | size of the field containing the address of the data. */ |
| 1624 | |
| 1625 | static int |
| 1626 | fat_pntr_data_bitsize (struct type *type) |
| 1627 | { |
| 1628 | type = desc_base_type (type); |
| 1629 | |
| 1630 | if (TYPE_FIELD_BITSIZE (type, 0) > 0) |
| 1631 | return TYPE_FIELD_BITSIZE (type, 0); |
| 1632 | else |
| 1633 | return TARGET_CHAR_BIT * TYPE_LENGTH (TYPE_FIELD_TYPE (type, 0)); |
| 1634 | } |
| 1635 | |
| 1636 | /* If BOUNDS is an array-bounds structure (or pointer to one), return |
| 1637 | the Ith lower bound stored in it, if WHICH is 0, and the Ith upper |
| 1638 | bound, if WHICH is 1. The first bound is I=1. */ |
| 1639 | |
| 1640 | static struct value * |
| 1641 | desc_one_bound (struct value *bounds, int i, int which) |
| 1642 | { |
| 1643 | return value_struct_elt (&bounds, NULL, bound_name[2 * i + which - 2], NULL, |
| 1644 | _("Bad GNAT array descriptor bounds")); |
| 1645 | } |
| 1646 | |
| 1647 | /* If BOUNDS is an array-bounds structure type, return the bit position |
| 1648 | of the Ith lower bound stored in it, if WHICH is 0, and the Ith upper |
| 1649 | bound, if WHICH is 1. The first bound is I=1. */ |
| 1650 | |
| 1651 | static int |
| 1652 | desc_bound_bitpos (struct type *type, int i, int which) |
| 1653 | { |
| 1654 | return TYPE_FIELD_BITPOS (desc_base_type (type), 2 * i + which - 2); |
| 1655 | } |
| 1656 | |
| 1657 | /* If BOUNDS is an array-bounds structure type, return the bit field size |
| 1658 | of the Ith lower bound stored in it, if WHICH is 0, and the Ith upper |
| 1659 | bound, if WHICH is 1. The first bound is I=1. */ |
| 1660 | |
| 1661 | static int |
| 1662 | desc_bound_bitsize (struct type *type, int i, int which) |
| 1663 | { |
| 1664 | type = desc_base_type (type); |
| 1665 | |
| 1666 | if (TYPE_FIELD_BITSIZE (type, 2 * i + which - 2) > 0) |
| 1667 | return TYPE_FIELD_BITSIZE (type, 2 * i + which - 2); |
| 1668 | else |
| 1669 | return 8 * TYPE_LENGTH (TYPE_FIELD_TYPE (type, 2 * i + which - 2)); |
| 1670 | } |
| 1671 | |
| 1672 | /* If TYPE is the type of an array-bounds structure, the type of its |
| 1673 | Ith bound (numbering from 1). Otherwise, NULL. */ |
| 1674 | |
| 1675 | static struct type * |
| 1676 | desc_index_type (struct type *type, int i) |
| 1677 | { |
| 1678 | type = desc_base_type (type); |
| 1679 | |
| 1680 | if (TYPE_CODE (type) == TYPE_CODE_STRUCT) |
| 1681 | return lookup_struct_elt_type (type, bound_name[2 * i - 2], 1); |
| 1682 | else |
| 1683 | return NULL; |
| 1684 | } |
| 1685 | |
| 1686 | /* The number of index positions in the array-bounds type TYPE. |
| 1687 | Return 0 if TYPE is NULL. */ |
| 1688 | |
| 1689 | static int |
| 1690 | desc_arity (struct type *type) |
| 1691 | { |
| 1692 | type = desc_base_type (type); |
| 1693 | |
| 1694 | if (type != NULL) |
| 1695 | return TYPE_NFIELDS (type) / 2; |
| 1696 | return 0; |
| 1697 | } |
| 1698 | |
| 1699 | /* Non-zero iff TYPE is a simple array type (not a pointer to one) or |
| 1700 | an array descriptor type (representing an unconstrained array |
| 1701 | type). */ |
| 1702 | |
| 1703 | static int |
| 1704 | ada_is_direct_array_type (struct type *type) |
| 1705 | { |
| 1706 | if (type == NULL) |
| 1707 | return 0; |
| 1708 | type = ada_check_typedef (type); |
| 1709 | return (TYPE_CODE (type) == TYPE_CODE_ARRAY |
| 1710 | || ada_is_array_descriptor_type (type)); |
| 1711 | } |
| 1712 | |
| 1713 | /* Non-zero iff TYPE represents any kind of array in Ada, or a pointer |
| 1714 | * to one. */ |
| 1715 | |
| 1716 | static int |
| 1717 | ada_is_array_type (struct type *type) |
| 1718 | { |
| 1719 | while (type != NULL |
| 1720 | && (TYPE_CODE (type) == TYPE_CODE_PTR |
| 1721 | || TYPE_CODE (type) == TYPE_CODE_REF)) |
| 1722 | type = TYPE_TARGET_TYPE (type); |
| 1723 | return ada_is_direct_array_type (type); |
| 1724 | } |
| 1725 | |
| 1726 | /* Non-zero iff TYPE is a simple array type or pointer to one. */ |
| 1727 | |
| 1728 | int |
| 1729 | ada_is_simple_array_type (struct type *type) |
| 1730 | { |
| 1731 | if (type == NULL) |
| 1732 | return 0; |
| 1733 | type = ada_check_typedef (type); |
| 1734 | return (TYPE_CODE (type) == TYPE_CODE_ARRAY |
| 1735 | || (TYPE_CODE (type) == TYPE_CODE_PTR |
| 1736 | && TYPE_CODE (ada_check_typedef (TYPE_TARGET_TYPE (type))) |
| 1737 | == TYPE_CODE_ARRAY)); |
| 1738 | } |
| 1739 | |
| 1740 | /* Non-zero iff TYPE belongs to a GNAT array descriptor. */ |
| 1741 | |
| 1742 | int |
| 1743 | ada_is_array_descriptor_type (struct type *type) |
| 1744 | { |
| 1745 | struct type *data_type = desc_data_target_type (type); |
| 1746 | |
| 1747 | if (type == NULL) |
| 1748 | return 0; |
| 1749 | type = ada_check_typedef (type); |
| 1750 | return (data_type != NULL |
| 1751 | && TYPE_CODE (data_type) == TYPE_CODE_ARRAY |
| 1752 | && desc_arity (desc_bounds_type (type)) > 0); |
| 1753 | } |
| 1754 | |
| 1755 | /* Non-zero iff type is a partially mal-formed GNAT array |
| 1756 | descriptor. FIXME: This is to compensate for some problems with |
| 1757 | debugging output from GNAT. Re-examine periodically to see if it |
| 1758 | is still needed. */ |
| 1759 | |
| 1760 | int |
| 1761 | ada_is_bogus_array_descriptor (struct type *type) |
| 1762 | { |
| 1763 | return |
| 1764 | type != NULL |
| 1765 | && TYPE_CODE (type) == TYPE_CODE_STRUCT |
| 1766 | && (lookup_struct_elt_type (type, "P_BOUNDS", 1) != NULL |
| 1767 | || lookup_struct_elt_type (type, "P_ARRAY", 1) != NULL) |
| 1768 | && !ada_is_array_descriptor_type (type); |
| 1769 | } |
| 1770 | |
| 1771 | |
| 1772 | /* If ARR has a record type in the form of a standard GNAT array descriptor, |
| 1773 | (fat pointer) returns the type of the array data described---specifically, |
| 1774 | a pointer-to-array type. If BOUNDS is non-zero, the bounds data are filled |
| 1775 | in from the descriptor; otherwise, they are left unspecified. If |
| 1776 | the ARR denotes a null array descriptor and BOUNDS is non-zero, |
| 1777 | returns NULL. The result is simply the type of ARR if ARR is not |
| 1778 | a descriptor. */ |
| 1779 | struct type * |
| 1780 | ada_type_of_array (struct value *arr, int bounds) |
| 1781 | { |
| 1782 | if (ada_is_constrained_packed_array_type (value_type (arr))) |
| 1783 | return decode_constrained_packed_array_type (value_type (arr)); |
| 1784 | |
| 1785 | if (!ada_is_array_descriptor_type (value_type (arr))) |
| 1786 | return value_type (arr); |
| 1787 | |
| 1788 | if (!bounds) |
| 1789 | { |
| 1790 | struct type *array_type = |
| 1791 | ada_check_typedef (desc_data_target_type (value_type (arr))); |
| 1792 | |
| 1793 | if (ada_is_unconstrained_packed_array_type (value_type (arr))) |
| 1794 | TYPE_FIELD_BITSIZE (array_type, 0) = |
| 1795 | decode_packed_array_bitsize (value_type (arr)); |
| 1796 | |
| 1797 | return array_type; |
| 1798 | } |
| 1799 | else |
| 1800 | { |
| 1801 | struct type *elt_type; |
| 1802 | int arity; |
| 1803 | struct value *descriptor; |
| 1804 | |
| 1805 | elt_type = ada_array_element_type (value_type (arr), -1); |
| 1806 | arity = ada_array_arity (value_type (arr)); |
| 1807 | |
| 1808 | if (elt_type == NULL || arity == 0) |
| 1809 | return ada_check_typedef (value_type (arr)); |
| 1810 | |
| 1811 | descriptor = desc_bounds (arr); |
| 1812 | if (value_as_long (descriptor) == 0) |
| 1813 | return NULL; |
| 1814 | while (arity > 0) |
| 1815 | { |
| 1816 | struct type *range_type = alloc_type_copy (value_type (arr)); |
| 1817 | struct type *array_type = alloc_type_copy (value_type (arr)); |
| 1818 | struct value *low = desc_one_bound (descriptor, arity, 0); |
| 1819 | struct value *high = desc_one_bound (descriptor, arity, 1); |
| 1820 | |
| 1821 | arity -= 1; |
| 1822 | create_range_type (range_type, value_type (low), |
| 1823 | longest_to_int (value_as_long (low)), |
| 1824 | longest_to_int (value_as_long (high))); |
| 1825 | elt_type = create_array_type (array_type, elt_type, range_type); |
| 1826 | |
| 1827 | if (ada_is_unconstrained_packed_array_type (value_type (arr))) |
| 1828 | { |
| 1829 | /* We need to store the element packed bitsize, as well as |
| 1830 | recompute the array size, because it was previously |
| 1831 | computed based on the unpacked element size. */ |
| 1832 | LONGEST lo = value_as_long (low); |
| 1833 | LONGEST hi = value_as_long (high); |
| 1834 | |
| 1835 | TYPE_FIELD_BITSIZE (elt_type, 0) = |
| 1836 | decode_packed_array_bitsize (value_type (arr)); |
| 1837 | /* If the array has no element, then the size is already |
| 1838 | zero, and does not need to be recomputed. */ |
| 1839 | if (lo < hi) |
| 1840 | { |
| 1841 | int array_bitsize = |
| 1842 | (hi - lo + 1) * TYPE_FIELD_BITSIZE (elt_type, 0); |
| 1843 | |
| 1844 | TYPE_LENGTH (array_type) = (array_bitsize + 7) / 8; |
| 1845 | } |
| 1846 | } |
| 1847 | } |
| 1848 | |
| 1849 | return lookup_pointer_type (elt_type); |
| 1850 | } |
| 1851 | } |
| 1852 | |
| 1853 | /* If ARR does not represent an array, returns ARR unchanged. |
| 1854 | Otherwise, returns either a standard GDB array with bounds set |
| 1855 | appropriately or, if ARR is a non-null fat pointer, a pointer to a standard |
| 1856 | GDB array. Returns NULL if ARR is a null fat pointer. */ |
| 1857 | |
| 1858 | struct value * |
| 1859 | ada_coerce_to_simple_array_ptr (struct value *arr) |
| 1860 | { |
| 1861 | if (ada_is_array_descriptor_type (value_type (arr))) |
| 1862 | { |
| 1863 | struct type *arrType = ada_type_of_array (arr, 1); |
| 1864 | |
| 1865 | if (arrType == NULL) |
| 1866 | return NULL; |
| 1867 | return value_cast (arrType, value_copy (desc_data (arr))); |
| 1868 | } |
| 1869 | else if (ada_is_constrained_packed_array_type (value_type (arr))) |
| 1870 | return decode_constrained_packed_array (arr); |
| 1871 | else |
| 1872 | return arr; |
| 1873 | } |
| 1874 | |
| 1875 | /* If ARR does not represent an array, returns ARR unchanged. |
| 1876 | Otherwise, returns a standard GDB array describing ARR (which may |
| 1877 | be ARR itself if it already is in the proper form). */ |
| 1878 | |
| 1879 | struct value * |
| 1880 | ada_coerce_to_simple_array (struct value *arr) |
| 1881 | { |
| 1882 | if (ada_is_array_descriptor_type (value_type (arr))) |
| 1883 | { |
| 1884 | struct value *arrVal = ada_coerce_to_simple_array_ptr (arr); |
| 1885 | |
| 1886 | if (arrVal == NULL) |
| 1887 | error (_("Bounds unavailable for null array pointer.")); |
| 1888 | check_size (TYPE_TARGET_TYPE (value_type (arrVal))); |
| 1889 | return value_ind (arrVal); |
| 1890 | } |
| 1891 | else if (ada_is_constrained_packed_array_type (value_type (arr))) |
| 1892 | return decode_constrained_packed_array (arr); |
| 1893 | else |
| 1894 | return arr; |
| 1895 | } |
| 1896 | |
| 1897 | /* If TYPE represents a GNAT array type, return it translated to an |
| 1898 | ordinary GDB array type (possibly with BITSIZE fields indicating |
| 1899 | packing). For other types, is the identity. */ |
| 1900 | |
| 1901 | struct type * |
| 1902 | ada_coerce_to_simple_array_type (struct type *type) |
| 1903 | { |
| 1904 | if (ada_is_constrained_packed_array_type (type)) |
| 1905 | return decode_constrained_packed_array_type (type); |
| 1906 | |
| 1907 | if (ada_is_array_descriptor_type (type)) |
| 1908 | return ada_check_typedef (desc_data_target_type (type)); |
| 1909 | |
| 1910 | return type; |
| 1911 | } |
| 1912 | |
| 1913 | /* Non-zero iff TYPE represents a standard GNAT packed-array type. */ |
| 1914 | |
| 1915 | static int |
| 1916 | ada_is_packed_array_type (struct type *type) |
| 1917 | { |
| 1918 | if (type == NULL) |
| 1919 | return 0; |
| 1920 | type = desc_base_type (type); |
| 1921 | type = ada_check_typedef (type); |
| 1922 | return |
| 1923 | ada_type_name (type) != NULL |
| 1924 | && strstr (ada_type_name (type), "___XP") != NULL; |
| 1925 | } |
| 1926 | |
| 1927 | /* Non-zero iff TYPE represents a standard GNAT constrained |
| 1928 | packed-array type. */ |
| 1929 | |
| 1930 | int |
| 1931 | ada_is_constrained_packed_array_type (struct type *type) |
| 1932 | { |
| 1933 | return ada_is_packed_array_type (type) |
| 1934 | && !ada_is_array_descriptor_type (type); |
| 1935 | } |
| 1936 | |
| 1937 | /* Non-zero iff TYPE represents an array descriptor for a |
| 1938 | unconstrained packed-array type. */ |
| 1939 | |
| 1940 | static int |
| 1941 | ada_is_unconstrained_packed_array_type (struct type *type) |
| 1942 | { |
| 1943 | return ada_is_packed_array_type (type) |
| 1944 | && ada_is_array_descriptor_type (type); |
| 1945 | } |
| 1946 | |
| 1947 | /* Given that TYPE encodes a packed array type (constrained or unconstrained), |
| 1948 | return the size of its elements in bits. */ |
| 1949 | |
| 1950 | static long |
| 1951 | decode_packed_array_bitsize (struct type *type) |
| 1952 | { |
| 1953 | char *raw_name; |
| 1954 | char *tail; |
| 1955 | long bits; |
| 1956 | |
| 1957 | /* Access to arrays implemented as fat pointers are encoded as a typedef |
| 1958 | of the fat pointer type. We need the name of the fat pointer type |
| 1959 | to do the decoding, so strip the typedef layer. */ |
| 1960 | if (TYPE_CODE (type) == TYPE_CODE_TYPEDEF) |
| 1961 | type = ada_typedef_target_type (type); |
| 1962 | |
| 1963 | raw_name = ada_type_name (ada_check_typedef (type)); |
| 1964 | if (!raw_name) |
| 1965 | raw_name = ada_type_name (desc_base_type (type)); |
| 1966 | |
| 1967 | if (!raw_name) |
| 1968 | return 0; |
| 1969 | |
| 1970 | tail = strstr (raw_name, "___XP"); |
| 1971 | gdb_assert (tail != NULL); |
| 1972 | |
| 1973 | if (sscanf (tail + sizeof ("___XP") - 1, "%ld", &bits) != 1) |
| 1974 | { |
| 1975 | lim_warning |
| 1976 | (_("could not understand bit size information on packed array")); |
| 1977 | return 0; |
| 1978 | } |
| 1979 | |
| 1980 | return bits; |
| 1981 | } |
| 1982 | |
| 1983 | /* Given that TYPE is a standard GDB array type with all bounds filled |
| 1984 | in, and that the element size of its ultimate scalar constituents |
| 1985 | (that is, either its elements, or, if it is an array of arrays, its |
| 1986 | elements' elements, etc.) is *ELT_BITS, return an identical type, |
| 1987 | but with the bit sizes of its elements (and those of any |
| 1988 | constituent arrays) recorded in the BITSIZE components of its |
| 1989 | TYPE_FIELD_BITSIZE values, and with *ELT_BITS set to its total size |
| 1990 | in bits. */ |
| 1991 | |
| 1992 | static struct type * |
| 1993 | constrained_packed_array_type (struct type *type, long *elt_bits) |
| 1994 | { |
| 1995 | struct type *new_elt_type; |
| 1996 | struct type *new_type; |
| 1997 | LONGEST low_bound, high_bound; |
| 1998 | |
| 1999 | type = ada_check_typedef (type); |
| 2000 | if (TYPE_CODE (type) != TYPE_CODE_ARRAY) |
| 2001 | return type; |
| 2002 | |
| 2003 | new_type = alloc_type_copy (type); |
| 2004 | new_elt_type = |
| 2005 | constrained_packed_array_type (ada_check_typedef (TYPE_TARGET_TYPE (type)), |
| 2006 | elt_bits); |
| 2007 | create_array_type (new_type, new_elt_type, TYPE_INDEX_TYPE (type)); |
| 2008 | TYPE_FIELD_BITSIZE (new_type, 0) = *elt_bits; |
| 2009 | TYPE_NAME (new_type) = ada_type_name (type); |
| 2010 | |
| 2011 | if (get_discrete_bounds (TYPE_INDEX_TYPE (type), |
| 2012 | &low_bound, &high_bound) < 0) |
| 2013 | low_bound = high_bound = 0; |
| 2014 | if (high_bound < low_bound) |
| 2015 | *elt_bits = TYPE_LENGTH (new_type) = 0; |
| 2016 | else |
| 2017 | { |
| 2018 | *elt_bits *= (high_bound - low_bound + 1); |
| 2019 | TYPE_LENGTH (new_type) = |
| 2020 | (*elt_bits + HOST_CHAR_BIT - 1) / HOST_CHAR_BIT; |
| 2021 | } |
| 2022 | |
| 2023 | TYPE_FIXED_INSTANCE (new_type) = 1; |
| 2024 | return new_type; |
| 2025 | } |
| 2026 | |
| 2027 | /* The array type encoded by TYPE, where |
| 2028 | ada_is_constrained_packed_array_type (TYPE). */ |
| 2029 | |
| 2030 | static struct type * |
| 2031 | decode_constrained_packed_array_type (struct type *type) |
| 2032 | { |
| 2033 | char *raw_name = ada_type_name (ada_check_typedef (type)); |
| 2034 | char *name; |
| 2035 | char *tail; |
| 2036 | struct type *shadow_type; |
| 2037 | long bits; |
| 2038 | |
| 2039 | if (!raw_name) |
| 2040 | raw_name = ada_type_name (desc_base_type (type)); |
| 2041 | |
| 2042 | if (!raw_name) |
| 2043 | return NULL; |
| 2044 | |
| 2045 | name = (char *) alloca (strlen (raw_name) + 1); |
| 2046 | tail = strstr (raw_name, "___XP"); |
| 2047 | type = desc_base_type (type); |
| 2048 | |
| 2049 | memcpy (name, raw_name, tail - raw_name); |
| 2050 | name[tail - raw_name] = '\000'; |
| 2051 | |
| 2052 | shadow_type = ada_find_parallel_type_with_name (type, name); |
| 2053 | |
| 2054 | if (shadow_type == NULL) |
| 2055 | { |
| 2056 | lim_warning (_("could not find bounds information on packed array")); |
| 2057 | return NULL; |
| 2058 | } |
| 2059 | CHECK_TYPEDEF (shadow_type); |
| 2060 | |
| 2061 | if (TYPE_CODE (shadow_type) != TYPE_CODE_ARRAY) |
| 2062 | { |
| 2063 | lim_warning (_("could not understand bounds " |
| 2064 | "information on packed array")); |
| 2065 | return NULL; |
| 2066 | } |
| 2067 | |
| 2068 | bits = decode_packed_array_bitsize (type); |
| 2069 | return constrained_packed_array_type (shadow_type, &bits); |
| 2070 | } |
| 2071 | |
| 2072 | /* Given that ARR is a struct value *indicating a GNAT constrained packed |
| 2073 | array, returns a simple array that denotes that array. Its type is a |
| 2074 | standard GDB array type except that the BITSIZEs of the array |
| 2075 | target types are set to the number of bits in each element, and the |
| 2076 | type length is set appropriately. */ |
| 2077 | |
| 2078 | static struct value * |
| 2079 | decode_constrained_packed_array (struct value *arr) |
| 2080 | { |
| 2081 | struct type *type; |
| 2082 | |
| 2083 | arr = ada_coerce_ref (arr); |
| 2084 | |
| 2085 | /* If our value is a pointer, then dererence it. Make sure that |
| 2086 | this operation does not cause the target type to be fixed, as |
| 2087 | this would indirectly cause this array to be decoded. The rest |
| 2088 | of the routine assumes that the array hasn't been decoded yet, |
| 2089 | so we use the basic "value_ind" routine to perform the dereferencing, |
| 2090 | as opposed to using "ada_value_ind". */ |
| 2091 | if (TYPE_CODE (value_type (arr)) == TYPE_CODE_PTR) |
| 2092 | arr = value_ind (arr); |
| 2093 | |
| 2094 | type = decode_constrained_packed_array_type (value_type (arr)); |
| 2095 | if (type == NULL) |
| 2096 | { |
| 2097 | error (_("can't unpack array")); |
| 2098 | return NULL; |
| 2099 | } |
| 2100 | |
| 2101 | if (gdbarch_bits_big_endian (get_type_arch (value_type (arr))) |
| 2102 | && ada_is_modular_type (value_type (arr))) |
| 2103 | { |
| 2104 | /* This is a (right-justified) modular type representing a packed |
| 2105 | array with no wrapper. In order to interpret the value through |
| 2106 | the (left-justified) packed array type we just built, we must |
| 2107 | first left-justify it. */ |
| 2108 | int bit_size, bit_pos; |
| 2109 | ULONGEST mod; |
| 2110 | |
| 2111 | mod = ada_modulus (value_type (arr)) - 1; |
| 2112 | bit_size = 0; |
| 2113 | while (mod > 0) |
| 2114 | { |
| 2115 | bit_size += 1; |
| 2116 | mod >>= 1; |
| 2117 | } |
| 2118 | bit_pos = HOST_CHAR_BIT * TYPE_LENGTH (value_type (arr)) - bit_size; |
| 2119 | arr = ada_value_primitive_packed_val (arr, NULL, |
| 2120 | bit_pos / HOST_CHAR_BIT, |
| 2121 | bit_pos % HOST_CHAR_BIT, |
| 2122 | bit_size, |
| 2123 | type); |
| 2124 | } |
| 2125 | |
| 2126 | return coerce_unspec_val_to_type (arr, type); |
| 2127 | } |
| 2128 | |
| 2129 | |
| 2130 | /* The value of the element of packed array ARR at the ARITY indices |
| 2131 | given in IND. ARR must be a simple array. */ |
| 2132 | |
| 2133 | static struct value * |
| 2134 | value_subscript_packed (struct value *arr, int arity, struct value **ind) |
| 2135 | { |
| 2136 | int i; |
| 2137 | int bits, elt_off, bit_off; |
| 2138 | long elt_total_bit_offset; |
| 2139 | struct type *elt_type; |
| 2140 | struct value *v; |
| 2141 | |
| 2142 | bits = 0; |
| 2143 | elt_total_bit_offset = 0; |
| 2144 | elt_type = ada_check_typedef (value_type (arr)); |
| 2145 | for (i = 0; i < arity; i += 1) |
| 2146 | { |
| 2147 | if (TYPE_CODE (elt_type) != TYPE_CODE_ARRAY |
| 2148 | || TYPE_FIELD_BITSIZE (elt_type, 0) == 0) |
| 2149 | error |
| 2150 | (_("attempt to do packed indexing of " |
| 2151 | "something other than a packed array")); |
| 2152 | else |
| 2153 | { |
| 2154 | struct type *range_type = TYPE_INDEX_TYPE (elt_type); |
| 2155 | LONGEST lowerbound, upperbound; |
| 2156 | LONGEST idx; |
| 2157 | |
| 2158 | if (get_discrete_bounds (range_type, &lowerbound, &upperbound) < 0) |
| 2159 | { |
| 2160 | lim_warning (_("don't know bounds of array")); |
| 2161 | lowerbound = upperbound = 0; |
| 2162 | } |
| 2163 | |
| 2164 | idx = pos_atr (ind[i]); |
| 2165 | if (idx < lowerbound || idx > upperbound) |
| 2166 | lim_warning (_("packed array index %ld out of bounds"), |
| 2167 | (long) idx); |
| 2168 | bits = TYPE_FIELD_BITSIZE (elt_type, 0); |
| 2169 | elt_total_bit_offset += (idx - lowerbound) * bits; |
| 2170 | elt_type = ada_check_typedef (TYPE_TARGET_TYPE (elt_type)); |
| 2171 | } |
| 2172 | } |
| 2173 | elt_off = elt_total_bit_offset / HOST_CHAR_BIT; |
| 2174 | bit_off = elt_total_bit_offset % HOST_CHAR_BIT; |
| 2175 | |
| 2176 | v = ada_value_primitive_packed_val (arr, NULL, elt_off, bit_off, |
| 2177 | bits, elt_type); |
| 2178 | return v; |
| 2179 | } |
| 2180 | |
| 2181 | /* Non-zero iff TYPE includes negative integer values. */ |
| 2182 | |
| 2183 | static int |
| 2184 | has_negatives (struct type *type) |
| 2185 | { |
| 2186 | switch (TYPE_CODE (type)) |
| 2187 | { |
| 2188 | default: |
| 2189 | return 0; |
| 2190 | case TYPE_CODE_INT: |
| 2191 | return !TYPE_UNSIGNED (type); |
| 2192 | case TYPE_CODE_RANGE: |
| 2193 | return TYPE_LOW_BOUND (type) < 0; |
| 2194 | } |
| 2195 | } |
| 2196 | |
| 2197 | |
| 2198 | /* Create a new value of type TYPE from the contents of OBJ starting |
| 2199 | at byte OFFSET, and bit offset BIT_OFFSET within that byte, |
| 2200 | proceeding for BIT_SIZE bits. If OBJ is an lval in memory, then |
| 2201 | assigning through the result will set the field fetched from. |
| 2202 | VALADDR is ignored unless OBJ is NULL, in which case, |
| 2203 | VALADDR+OFFSET must address the start of storage containing the |
| 2204 | packed value. The value returned in this case is never an lval. |
| 2205 | Assumes 0 <= BIT_OFFSET < HOST_CHAR_BIT. */ |
| 2206 | |
| 2207 | struct value * |
| 2208 | ada_value_primitive_packed_val (struct value *obj, const gdb_byte *valaddr, |
| 2209 | long offset, int bit_offset, int bit_size, |
| 2210 | struct type *type) |
| 2211 | { |
| 2212 | struct value *v; |
| 2213 | int src, /* Index into the source area */ |
| 2214 | targ, /* Index into the target area */ |
| 2215 | srcBitsLeft, /* Number of source bits left to move */ |
| 2216 | nsrc, ntarg, /* Number of source and target bytes */ |
| 2217 | unusedLS, /* Number of bits in next significant |
| 2218 | byte of source that are unused */ |
| 2219 | accumSize; /* Number of meaningful bits in accum */ |
| 2220 | unsigned char *bytes; /* First byte containing data to unpack */ |
| 2221 | unsigned char *unpacked; |
| 2222 | unsigned long accum; /* Staging area for bits being transferred */ |
| 2223 | unsigned char sign; |
| 2224 | int len = (bit_size + bit_offset + HOST_CHAR_BIT - 1) / 8; |
| 2225 | /* Transmit bytes from least to most significant; delta is the direction |
| 2226 | the indices move. */ |
| 2227 | int delta = gdbarch_bits_big_endian (get_type_arch (type)) ? -1 : 1; |
| 2228 | |
| 2229 | type = ada_check_typedef (type); |
| 2230 | |
| 2231 | if (obj == NULL) |
| 2232 | { |
| 2233 | v = allocate_value (type); |
| 2234 | bytes = (unsigned char *) (valaddr + offset); |
| 2235 | } |
| 2236 | else if (VALUE_LVAL (obj) == lval_memory && value_lazy (obj)) |
| 2237 | { |
| 2238 | v = value_at (type, |
| 2239 | value_address (obj) + offset); |
| 2240 | bytes = (unsigned char *) alloca (len); |
| 2241 | read_memory (value_address (v), bytes, len); |
| 2242 | } |
| 2243 | else |
| 2244 | { |
| 2245 | v = allocate_value (type); |
| 2246 | bytes = (unsigned char *) value_contents (obj) + offset; |
| 2247 | } |
| 2248 | |
| 2249 | if (obj != NULL) |
| 2250 | { |
| 2251 | CORE_ADDR new_addr; |
| 2252 | |
| 2253 | set_value_component_location (v, obj); |
| 2254 | new_addr = value_address (obj) + offset; |
| 2255 | set_value_bitpos (v, bit_offset + value_bitpos (obj)); |
| 2256 | set_value_bitsize (v, bit_size); |
| 2257 | if (value_bitpos (v) >= HOST_CHAR_BIT) |
| 2258 | { |
| 2259 | ++new_addr; |
| 2260 | set_value_bitpos (v, value_bitpos (v) - HOST_CHAR_BIT); |
| 2261 | } |
| 2262 | set_value_address (v, new_addr); |
| 2263 | } |
| 2264 | else |
| 2265 | set_value_bitsize (v, bit_size); |
| 2266 | unpacked = (unsigned char *) value_contents (v); |
| 2267 | |
| 2268 | srcBitsLeft = bit_size; |
| 2269 | nsrc = len; |
| 2270 | ntarg = TYPE_LENGTH (type); |
| 2271 | sign = 0; |
| 2272 | if (bit_size == 0) |
| 2273 | { |
| 2274 | memset (unpacked, 0, TYPE_LENGTH (type)); |
| 2275 | return v; |
| 2276 | } |
| 2277 | else if (gdbarch_bits_big_endian (get_type_arch (type))) |
| 2278 | { |
| 2279 | src = len - 1; |
| 2280 | if (has_negatives (type) |
| 2281 | && ((bytes[0] << bit_offset) & (1 << (HOST_CHAR_BIT - 1)))) |
| 2282 | sign = ~0; |
| 2283 | |
| 2284 | unusedLS = |
| 2285 | (HOST_CHAR_BIT - (bit_size + bit_offset) % HOST_CHAR_BIT) |
| 2286 | % HOST_CHAR_BIT; |
| 2287 | |
| 2288 | switch (TYPE_CODE (type)) |
| 2289 | { |
| 2290 | case TYPE_CODE_ARRAY: |
| 2291 | case TYPE_CODE_UNION: |
| 2292 | case TYPE_CODE_STRUCT: |
| 2293 | /* Non-scalar values must be aligned at a byte boundary... */ |
| 2294 | accumSize = |
| 2295 | (HOST_CHAR_BIT - bit_size % HOST_CHAR_BIT) % HOST_CHAR_BIT; |
| 2296 | /* ... And are placed at the beginning (most-significant) bytes |
| 2297 | of the target. */ |
| 2298 | targ = (bit_size + HOST_CHAR_BIT - 1) / HOST_CHAR_BIT - 1; |
| 2299 | ntarg = targ + 1; |
| 2300 | break; |
| 2301 | default: |
| 2302 | accumSize = 0; |
| 2303 | targ = TYPE_LENGTH (type) - 1; |
| 2304 | break; |
| 2305 | } |
| 2306 | } |
| 2307 | else |
| 2308 | { |
| 2309 | int sign_bit_offset = (bit_size + bit_offset - 1) % 8; |
| 2310 | |
| 2311 | src = targ = 0; |
| 2312 | unusedLS = bit_offset; |
| 2313 | accumSize = 0; |
| 2314 | |
| 2315 | if (has_negatives (type) && (bytes[len - 1] & (1 << sign_bit_offset))) |
| 2316 | sign = ~0; |
| 2317 | } |
| 2318 | |
| 2319 | accum = 0; |
| 2320 | while (nsrc > 0) |
| 2321 | { |
| 2322 | /* Mask for removing bits of the next source byte that are not |
| 2323 | part of the value. */ |
| 2324 | unsigned int unusedMSMask = |
| 2325 | (1 << (srcBitsLeft >= HOST_CHAR_BIT ? HOST_CHAR_BIT : srcBitsLeft)) - |
| 2326 | 1; |
| 2327 | /* Sign-extend bits for this byte. */ |
| 2328 | unsigned int signMask = sign & ~unusedMSMask; |
| 2329 | |
| 2330 | accum |= |
| 2331 | (((bytes[src] >> unusedLS) & unusedMSMask) | signMask) << accumSize; |
| 2332 | accumSize += HOST_CHAR_BIT - unusedLS; |
| 2333 | if (accumSize >= HOST_CHAR_BIT) |
| 2334 | { |
| 2335 | unpacked[targ] = accum & ~(~0L << HOST_CHAR_BIT); |
| 2336 | accumSize -= HOST_CHAR_BIT; |
| 2337 | accum >>= HOST_CHAR_BIT; |
| 2338 | ntarg -= 1; |
| 2339 | targ += delta; |
| 2340 | } |
| 2341 | srcBitsLeft -= HOST_CHAR_BIT - unusedLS; |
| 2342 | unusedLS = 0; |
| 2343 | nsrc -= 1; |
| 2344 | src += delta; |
| 2345 | } |
| 2346 | while (ntarg > 0) |
| 2347 | { |
| 2348 | accum |= sign << accumSize; |
| 2349 | unpacked[targ] = accum & ~(~0L << HOST_CHAR_BIT); |
| 2350 | accumSize -= HOST_CHAR_BIT; |
| 2351 | accum >>= HOST_CHAR_BIT; |
| 2352 | ntarg -= 1; |
| 2353 | targ += delta; |
| 2354 | } |
| 2355 | |
| 2356 | return v; |
| 2357 | } |
| 2358 | |
| 2359 | /* Move N bits from SOURCE, starting at bit offset SRC_OFFSET to |
| 2360 | TARGET, starting at bit offset TARG_OFFSET. SOURCE and TARGET must |
| 2361 | not overlap. */ |
| 2362 | static void |
| 2363 | move_bits (gdb_byte *target, int targ_offset, const gdb_byte *source, |
| 2364 | int src_offset, int n, int bits_big_endian_p) |
| 2365 | { |
| 2366 | unsigned int accum, mask; |
| 2367 | int accum_bits, chunk_size; |
| 2368 | |
| 2369 | target += targ_offset / HOST_CHAR_BIT; |
| 2370 | targ_offset %= HOST_CHAR_BIT; |
| 2371 | source += src_offset / HOST_CHAR_BIT; |
| 2372 | src_offset %= HOST_CHAR_BIT; |
| 2373 | if (bits_big_endian_p) |
| 2374 | { |
| 2375 | accum = (unsigned char) *source; |
| 2376 | source += 1; |
| 2377 | accum_bits = HOST_CHAR_BIT - src_offset; |
| 2378 | |
| 2379 | while (n > 0) |
| 2380 | { |
| 2381 | int unused_right; |
| 2382 | |
| 2383 | accum = (accum << HOST_CHAR_BIT) + (unsigned char) *source; |
| 2384 | accum_bits += HOST_CHAR_BIT; |
| 2385 | source += 1; |
| 2386 | chunk_size = HOST_CHAR_BIT - targ_offset; |
| 2387 | if (chunk_size > n) |
| 2388 | chunk_size = n; |
| 2389 | unused_right = HOST_CHAR_BIT - (chunk_size + targ_offset); |
| 2390 | mask = ((1 << chunk_size) - 1) << unused_right; |
| 2391 | *target = |
| 2392 | (*target & ~mask) |
| 2393 | | ((accum >> (accum_bits - chunk_size - unused_right)) & mask); |
| 2394 | n -= chunk_size; |
| 2395 | accum_bits -= chunk_size; |
| 2396 | target += 1; |
| 2397 | targ_offset = 0; |
| 2398 | } |
| 2399 | } |
| 2400 | else |
| 2401 | { |
| 2402 | accum = (unsigned char) *source >> src_offset; |
| 2403 | source += 1; |
| 2404 | accum_bits = HOST_CHAR_BIT - src_offset; |
| 2405 | |
| 2406 | while (n > 0) |
| 2407 | { |
| 2408 | accum = accum + ((unsigned char) *source << accum_bits); |
| 2409 | accum_bits += HOST_CHAR_BIT; |
| 2410 | source += 1; |
| 2411 | chunk_size = HOST_CHAR_BIT - targ_offset; |
| 2412 | if (chunk_size > n) |
| 2413 | chunk_size = n; |
| 2414 | mask = ((1 << chunk_size) - 1) << targ_offset; |
| 2415 | *target = (*target & ~mask) | ((accum << targ_offset) & mask); |
| 2416 | n -= chunk_size; |
| 2417 | accum_bits -= chunk_size; |
| 2418 | accum >>= chunk_size; |
| 2419 | target += 1; |
| 2420 | targ_offset = 0; |
| 2421 | } |
| 2422 | } |
| 2423 | } |
| 2424 | |
| 2425 | /* Store the contents of FROMVAL into the location of TOVAL. |
| 2426 | Return a new value with the location of TOVAL and contents of |
| 2427 | FROMVAL. Handles assignment into packed fields that have |
| 2428 | floating-point or non-scalar types. */ |
| 2429 | |
| 2430 | static struct value * |
| 2431 | ada_value_assign (struct value *toval, struct value *fromval) |
| 2432 | { |
| 2433 | struct type *type = value_type (toval); |
| 2434 | int bits = value_bitsize (toval); |
| 2435 | |
| 2436 | toval = ada_coerce_ref (toval); |
| 2437 | fromval = ada_coerce_ref (fromval); |
| 2438 | |
| 2439 | if (ada_is_direct_array_type (value_type (toval))) |
| 2440 | toval = ada_coerce_to_simple_array (toval); |
| 2441 | if (ada_is_direct_array_type (value_type (fromval))) |
| 2442 | fromval = ada_coerce_to_simple_array (fromval); |
| 2443 | |
| 2444 | if (!deprecated_value_modifiable (toval)) |
| 2445 | error (_("Left operand of assignment is not a modifiable lvalue.")); |
| 2446 | |
| 2447 | if (VALUE_LVAL (toval) == lval_memory |
| 2448 | && bits > 0 |
| 2449 | && (TYPE_CODE (type) == TYPE_CODE_FLT |
| 2450 | || TYPE_CODE (type) == TYPE_CODE_STRUCT)) |
| 2451 | { |
| 2452 | int len = (value_bitpos (toval) |
| 2453 | + bits + HOST_CHAR_BIT - 1) / HOST_CHAR_BIT; |
| 2454 | int from_size; |
| 2455 | char *buffer = (char *) alloca (len); |
| 2456 | struct value *val; |
| 2457 | CORE_ADDR to_addr = value_address (toval); |
| 2458 | |
| 2459 | if (TYPE_CODE (type) == TYPE_CODE_FLT) |
| 2460 | fromval = value_cast (type, fromval); |
| 2461 | |
| 2462 | read_memory (to_addr, buffer, len); |
| 2463 | from_size = value_bitsize (fromval); |
| 2464 | if (from_size == 0) |
| 2465 | from_size = TYPE_LENGTH (value_type (fromval)) * TARGET_CHAR_BIT; |
| 2466 | if (gdbarch_bits_big_endian (get_type_arch (type))) |
| 2467 | move_bits (buffer, value_bitpos (toval), |
| 2468 | value_contents (fromval), from_size - bits, bits, 1); |
| 2469 | else |
| 2470 | move_bits (buffer, value_bitpos (toval), |
| 2471 | value_contents (fromval), 0, bits, 0); |
| 2472 | write_memory (to_addr, buffer, len); |
| 2473 | observer_notify_memory_changed (to_addr, len, buffer); |
| 2474 | |
| 2475 | val = value_copy (toval); |
| 2476 | memcpy (value_contents_raw (val), value_contents (fromval), |
| 2477 | TYPE_LENGTH (type)); |
| 2478 | deprecated_set_value_type (val, type); |
| 2479 | |
| 2480 | return val; |
| 2481 | } |
| 2482 | |
| 2483 | return value_assign (toval, fromval); |
| 2484 | } |
| 2485 | |
| 2486 | |
| 2487 | /* Given that COMPONENT is a memory lvalue that is part of the lvalue |
| 2488 | * CONTAINER, assign the contents of VAL to COMPONENTS's place in |
| 2489 | * CONTAINER. Modifies the VALUE_CONTENTS of CONTAINER only, not |
| 2490 | * COMPONENT, and not the inferior's memory. The current contents |
| 2491 | * of COMPONENT are ignored. */ |
| 2492 | static void |
| 2493 | value_assign_to_component (struct value *container, struct value *component, |
| 2494 | struct value *val) |
| 2495 | { |
| 2496 | LONGEST offset_in_container = |
| 2497 | (LONGEST) (value_address (component) - value_address (container)); |
| 2498 | int bit_offset_in_container = |
| 2499 | value_bitpos (component) - value_bitpos (container); |
| 2500 | int bits; |
| 2501 | |
| 2502 | val = value_cast (value_type (component), val); |
| 2503 | |
| 2504 | if (value_bitsize (component) == 0) |
| 2505 | bits = TARGET_CHAR_BIT * TYPE_LENGTH (value_type (component)); |
| 2506 | else |
| 2507 | bits = value_bitsize (component); |
| 2508 | |
| 2509 | if (gdbarch_bits_big_endian (get_type_arch (value_type (container)))) |
| 2510 | move_bits (value_contents_writeable (container) + offset_in_container, |
| 2511 | value_bitpos (container) + bit_offset_in_container, |
| 2512 | value_contents (val), |
| 2513 | TYPE_LENGTH (value_type (component)) * TARGET_CHAR_BIT - bits, |
| 2514 | bits, 1); |
| 2515 | else |
| 2516 | move_bits (value_contents_writeable (container) + offset_in_container, |
| 2517 | value_bitpos (container) + bit_offset_in_container, |
| 2518 | value_contents (val), 0, bits, 0); |
| 2519 | } |
| 2520 | |
| 2521 | /* The value of the element of array ARR at the ARITY indices given in IND. |
| 2522 | ARR may be either a simple array, GNAT array descriptor, or pointer |
| 2523 | thereto. */ |
| 2524 | |
| 2525 | struct value * |
| 2526 | ada_value_subscript (struct value *arr, int arity, struct value **ind) |
| 2527 | { |
| 2528 | int k; |
| 2529 | struct value *elt; |
| 2530 | struct type *elt_type; |
| 2531 | |
| 2532 | elt = ada_coerce_to_simple_array (arr); |
| 2533 | |
| 2534 | elt_type = ada_check_typedef (value_type (elt)); |
| 2535 | if (TYPE_CODE (elt_type) == TYPE_CODE_ARRAY |
| 2536 | && TYPE_FIELD_BITSIZE (elt_type, 0) > 0) |
| 2537 | return value_subscript_packed (elt, arity, ind); |
| 2538 | |
| 2539 | for (k = 0; k < arity; k += 1) |
| 2540 | { |
| 2541 | if (TYPE_CODE (elt_type) != TYPE_CODE_ARRAY) |
| 2542 | error (_("too many subscripts (%d expected)"), k); |
| 2543 | elt = value_subscript (elt, pos_atr (ind[k])); |
| 2544 | } |
| 2545 | return elt; |
| 2546 | } |
| 2547 | |
| 2548 | /* Assuming ARR is a pointer to a standard GDB array of type TYPE, the |
| 2549 | value of the element of *ARR at the ARITY indices given in |
| 2550 | IND. Does not read the entire array into memory. */ |
| 2551 | |
| 2552 | static struct value * |
| 2553 | ada_value_ptr_subscript (struct value *arr, struct type *type, int arity, |
| 2554 | struct value **ind) |
| 2555 | { |
| 2556 | int k; |
| 2557 | |
| 2558 | for (k = 0; k < arity; k += 1) |
| 2559 | { |
| 2560 | LONGEST lwb, upb; |
| 2561 | |
| 2562 | if (TYPE_CODE (type) != TYPE_CODE_ARRAY) |
| 2563 | error (_("too many subscripts (%d expected)"), k); |
| 2564 | arr = value_cast (lookup_pointer_type (TYPE_TARGET_TYPE (type)), |
| 2565 | value_copy (arr)); |
| 2566 | get_discrete_bounds (TYPE_INDEX_TYPE (type), &lwb, &upb); |
| 2567 | arr = value_ptradd (arr, pos_atr (ind[k]) - lwb); |
| 2568 | type = TYPE_TARGET_TYPE (type); |
| 2569 | } |
| 2570 | |
| 2571 | return value_ind (arr); |
| 2572 | } |
| 2573 | |
| 2574 | /* Given that ARRAY_PTR is a pointer or reference to an array of type TYPE (the |
| 2575 | actual type of ARRAY_PTR is ignored), returns the Ada slice of HIGH-LOW+1 |
| 2576 | elements starting at index LOW. The lower bound of this array is LOW, as |
| 2577 | per Ada rules. */ |
| 2578 | static struct value * |
| 2579 | ada_value_slice_from_ptr (struct value *array_ptr, struct type *type, |
| 2580 | int low, int high) |
| 2581 | { |
| 2582 | struct type *type0 = ada_check_typedef (type); |
| 2583 | CORE_ADDR base = value_as_address (array_ptr) |
| 2584 | + ((low - ada_discrete_type_low_bound (TYPE_INDEX_TYPE (type0))) |
| 2585 | * TYPE_LENGTH (TYPE_TARGET_TYPE (type0))); |
| 2586 | struct type *index_type = |
| 2587 | create_range_type (NULL, TYPE_TARGET_TYPE (TYPE_INDEX_TYPE (type0)), |
| 2588 | low, high); |
| 2589 | struct type *slice_type = |
| 2590 | create_array_type (NULL, TYPE_TARGET_TYPE (type0), index_type); |
| 2591 | |
| 2592 | return value_at_lazy (slice_type, base); |
| 2593 | } |
| 2594 | |
| 2595 | |
| 2596 | static struct value * |
| 2597 | ada_value_slice (struct value *array, int low, int high) |
| 2598 | { |
| 2599 | struct type *type = ada_check_typedef (value_type (array)); |
| 2600 | struct type *index_type = |
| 2601 | create_range_type (NULL, TYPE_INDEX_TYPE (type), low, high); |
| 2602 | struct type *slice_type = |
| 2603 | create_array_type (NULL, TYPE_TARGET_TYPE (type), index_type); |
| 2604 | |
| 2605 | return value_cast (slice_type, value_slice (array, low, high - low + 1)); |
| 2606 | } |
| 2607 | |
| 2608 | /* If type is a record type in the form of a standard GNAT array |
| 2609 | descriptor, returns the number of dimensions for type. If arr is a |
| 2610 | simple array, returns the number of "array of"s that prefix its |
| 2611 | type designation. Otherwise, returns 0. */ |
| 2612 | |
| 2613 | int |
| 2614 | ada_array_arity (struct type *type) |
| 2615 | { |
| 2616 | int arity; |
| 2617 | |
| 2618 | if (type == NULL) |
| 2619 | return 0; |
| 2620 | |
| 2621 | type = desc_base_type (type); |
| 2622 | |
| 2623 | arity = 0; |
| 2624 | if (TYPE_CODE (type) == TYPE_CODE_STRUCT) |
| 2625 | return desc_arity (desc_bounds_type (type)); |
| 2626 | else |
| 2627 | while (TYPE_CODE (type) == TYPE_CODE_ARRAY) |
| 2628 | { |
| 2629 | arity += 1; |
| 2630 | type = ada_check_typedef (TYPE_TARGET_TYPE (type)); |
| 2631 | } |
| 2632 | |
| 2633 | return arity; |
| 2634 | } |
| 2635 | |
| 2636 | /* If TYPE is a record type in the form of a standard GNAT array |
| 2637 | descriptor or a simple array type, returns the element type for |
| 2638 | TYPE after indexing by NINDICES indices, or by all indices if |
| 2639 | NINDICES is -1. Otherwise, returns NULL. */ |
| 2640 | |
| 2641 | struct type * |
| 2642 | ada_array_element_type (struct type *type, int nindices) |
| 2643 | { |
| 2644 | type = desc_base_type (type); |
| 2645 | |
| 2646 | if (TYPE_CODE (type) == TYPE_CODE_STRUCT) |
| 2647 | { |
| 2648 | int k; |
| 2649 | struct type *p_array_type; |
| 2650 | |
| 2651 | p_array_type = desc_data_target_type (type); |
| 2652 | |
| 2653 | k = ada_array_arity (type); |
| 2654 | if (k == 0) |
| 2655 | return NULL; |
| 2656 | |
| 2657 | /* Initially p_array_type = elt_type(*)[]...(k times)...[]. */ |
| 2658 | if (nindices >= 0 && k > nindices) |
| 2659 | k = nindices; |
| 2660 | while (k > 0 && p_array_type != NULL) |
| 2661 | { |
| 2662 | p_array_type = ada_check_typedef (TYPE_TARGET_TYPE (p_array_type)); |
| 2663 | k -= 1; |
| 2664 | } |
| 2665 | return p_array_type; |
| 2666 | } |
| 2667 | else if (TYPE_CODE (type) == TYPE_CODE_ARRAY) |
| 2668 | { |
| 2669 | while (nindices != 0 && TYPE_CODE (type) == TYPE_CODE_ARRAY) |
| 2670 | { |
| 2671 | type = TYPE_TARGET_TYPE (type); |
| 2672 | nindices -= 1; |
| 2673 | } |
| 2674 | return type; |
| 2675 | } |
| 2676 | |
| 2677 | return NULL; |
| 2678 | } |
| 2679 | |
| 2680 | /* The type of nth index in arrays of given type (n numbering from 1). |
| 2681 | Does not examine memory. Throws an error if N is invalid or TYPE |
| 2682 | is not an array type. NAME is the name of the Ada attribute being |
| 2683 | evaluated ('range, 'first, 'last, or 'length); it is used in building |
| 2684 | the error message. */ |
| 2685 | |
| 2686 | static struct type * |
| 2687 | ada_index_type (struct type *type, int n, const char *name) |
| 2688 | { |
| 2689 | struct type *result_type; |
| 2690 | |
| 2691 | type = desc_base_type (type); |
| 2692 | |
| 2693 | if (n < 0 || n > ada_array_arity (type)) |
| 2694 | error (_("invalid dimension number to '%s"), name); |
| 2695 | |
| 2696 | if (ada_is_simple_array_type (type)) |
| 2697 | { |
| 2698 | int i; |
| 2699 | |
| 2700 | for (i = 1; i < n; i += 1) |
| 2701 | type = TYPE_TARGET_TYPE (type); |
| 2702 | result_type = TYPE_TARGET_TYPE (TYPE_INDEX_TYPE (type)); |
| 2703 | /* FIXME: The stabs type r(0,0);bound;bound in an array type |
| 2704 | has a target type of TYPE_CODE_UNDEF. We compensate here, but |
| 2705 | perhaps stabsread.c would make more sense. */ |
| 2706 | if (result_type && TYPE_CODE (result_type) == TYPE_CODE_UNDEF) |
| 2707 | result_type = NULL; |
| 2708 | } |
| 2709 | else |
| 2710 | { |
| 2711 | result_type = desc_index_type (desc_bounds_type (type), n); |
| 2712 | if (result_type == NULL) |
| 2713 | error (_("attempt to take bound of something that is not an array")); |
| 2714 | } |
| 2715 | |
| 2716 | return result_type; |
| 2717 | } |
| 2718 | |
| 2719 | /* Given that arr is an array type, returns the lower bound of the |
| 2720 | Nth index (numbering from 1) if WHICH is 0, and the upper bound if |
| 2721 | WHICH is 1. This returns bounds 0 .. -1 if ARR_TYPE is an |
| 2722 | array-descriptor type. It works for other arrays with bounds supplied |
| 2723 | by run-time quantities other than discriminants. */ |
| 2724 | |
| 2725 | static LONGEST |
| 2726 | ada_array_bound_from_type (struct type * arr_type, int n, int which) |
| 2727 | { |
| 2728 | struct type *type, *elt_type, *index_type_desc, *index_type; |
| 2729 | int i; |
| 2730 | |
| 2731 | gdb_assert (which == 0 || which == 1); |
| 2732 | |
| 2733 | if (ada_is_constrained_packed_array_type (arr_type)) |
| 2734 | arr_type = decode_constrained_packed_array_type (arr_type); |
| 2735 | |
| 2736 | if (arr_type == NULL || !ada_is_simple_array_type (arr_type)) |
| 2737 | return (LONGEST) - which; |
| 2738 | |
| 2739 | if (TYPE_CODE (arr_type) == TYPE_CODE_PTR) |
| 2740 | type = TYPE_TARGET_TYPE (arr_type); |
| 2741 | else |
| 2742 | type = arr_type; |
| 2743 | |
| 2744 | elt_type = type; |
| 2745 | for (i = n; i > 1; i--) |
| 2746 | elt_type = TYPE_TARGET_TYPE (type); |
| 2747 | |
| 2748 | index_type_desc = ada_find_parallel_type (type, "___XA"); |
| 2749 | ada_fixup_array_indexes_type (index_type_desc); |
| 2750 | if (index_type_desc != NULL) |
| 2751 | index_type = to_fixed_range_type (TYPE_FIELD_TYPE (index_type_desc, n - 1), |
| 2752 | NULL); |
| 2753 | else |
| 2754 | index_type = TYPE_INDEX_TYPE (elt_type); |
| 2755 | |
| 2756 | return |
| 2757 | (LONGEST) (which == 0 |
| 2758 | ? ada_discrete_type_low_bound (index_type) |
| 2759 | : ada_discrete_type_high_bound (index_type)); |
| 2760 | } |
| 2761 | |
| 2762 | /* Given that arr is an array value, returns the lower bound of the |
| 2763 | nth index (numbering from 1) if WHICH is 0, and the upper bound if |
| 2764 | WHICH is 1. This routine will also work for arrays with bounds |
| 2765 | supplied by run-time quantities other than discriminants. */ |
| 2766 | |
| 2767 | static LONGEST |
| 2768 | ada_array_bound (struct value *arr, int n, int which) |
| 2769 | { |
| 2770 | struct type *arr_type = value_type (arr); |
| 2771 | |
| 2772 | if (ada_is_constrained_packed_array_type (arr_type)) |
| 2773 | return ada_array_bound (decode_constrained_packed_array (arr), n, which); |
| 2774 | else if (ada_is_simple_array_type (arr_type)) |
| 2775 | return ada_array_bound_from_type (arr_type, n, which); |
| 2776 | else |
| 2777 | return value_as_long (desc_one_bound (desc_bounds (arr), n, which)); |
| 2778 | } |
| 2779 | |
| 2780 | /* Given that arr is an array value, returns the length of the |
| 2781 | nth index. This routine will also work for arrays with bounds |
| 2782 | supplied by run-time quantities other than discriminants. |
| 2783 | Does not work for arrays indexed by enumeration types with representation |
| 2784 | clauses at the moment. */ |
| 2785 | |
| 2786 | static LONGEST |
| 2787 | ada_array_length (struct value *arr, int n) |
| 2788 | { |
| 2789 | struct type *arr_type = ada_check_typedef (value_type (arr)); |
| 2790 | |
| 2791 | if (ada_is_constrained_packed_array_type (arr_type)) |
| 2792 | return ada_array_length (decode_constrained_packed_array (arr), n); |
| 2793 | |
| 2794 | if (ada_is_simple_array_type (arr_type)) |
| 2795 | return (ada_array_bound_from_type (arr_type, n, 1) |
| 2796 | - ada_array_bound_from_type (arr_type, n, 0) + 1); |
| 2797 | else |
| 2798 | return (value_as_long (desc_one_bound (desc_bounds (arr), n, 1)) |
| 2799 | - value_as_long (desc_one_bound (desc_bounds (arr), n, 0)) + 1); |
| 2800 | } |
| 2801 | |
| 2802 | /* An empty array whose type is that of ARR_TYPE (an array type), |
| 2803 | with bounds LOW to LOW-1. */ |
| 2804 | |
| 2805 | static struct value * |
| 2806 | empty_array (struct type *arr_type, int low) |
| 2807 | { |
| 2808 | struct type *arr_type0 = ada_check_typedef (arr_type); |
| 2809 | struct type *index_type = |
| 2810 | create_range_type (NULL, TYPE_TARGET_TYPE (TYPE_INDEX_TYPE (arr_type0)), |
| 2811 | low, low - 1); |
| 2812 | struct type *elt_type = ada_array_element_type (arr_type0, 1); |
| 2813 | |
| 2814 | return allocate_value (create_array_type (NULL, elt_type, index_type)); |
| 2815 | } |
| 2816 | \f |
| 2817 | |
| 2818 | /* Name resolution */ |
| 2819 | |
| 2820 | /* The "decoded" name for the user-definable Ada operator corresponding |
| 2821 | to OP. */ |
| 2822 | |
| 2823 | static const char * |
| 2824 | ada_decoded_op_name (enum exp_opcode op) |
| 2825 | { |
| 2826 | int i; |
| 2827 | |
| 2828 | for (i = 0; ada_opname_table[i].encoded != NULL; i += 1) |
| 2829 | { |
| 2830 | if (ada_opname_table[i].op == op) |
| 2831 | return ada_opname_table[i].decoded; |
| 2832 | } |
| 2833 | error (_("Could not find operator name for opcode")); |
| 2834 | } |
| 2835 | |
| 2836 | |
| 2837 | /* Same as evaluate_type (*EXP), but resolves ambiguous symbol |
| 2838 | references (marked by OP_VAR_VALUE nodes in which the symbol has an |
| 2839 | undefined namespace) and converts operators that are |
| 2840 | user-defined into appropriate function calls. If CONTEXT_TYPE is |
| 2841 | non-null, it provides a preferred result type [at the moment, only |
| 2842 | type void has any effect---causing procedures to be preferred over |
| 2843 | functions in calls]. A null CONTEXT_TYPE indicates that a non-void |
| 2844 | return type is preferred. May change (expand) *EXP. */ |
| 2845 | |
| 2846 | static void |
| 2847 | resolve (struct expression **expp, int void_context_p) |
| 2848 | { |
| 2849 | struct type *context_type = NULL; |
| 2850 | int pc = 0; |
| 2851 | |
| 2852 | if (void_context_p) |
| 2853 | context_type = builtin_type ((*expp)->gdbarch)->builtin_void; |
| 2854 | |
| 2855 | resolve_subexp (expp, &pc, 1, context_type); |
| 2856 | } |
| 2857 | |
| 2858 | /* Resolve the operator of the subexpression beginning at |
| 2859 | position *POS of *EXPP. "Resolving" consists of replacing |
| 2860 | the symbols that have undefined namespaces in OP_VAR_VALUE nodes |
| 2861 | with their resolutions, replacing built-in operators with |
| 2862 | function calls to user-defined operators, where appropriate, and, |
| 2863 | when DEPROCEDURE_P is non-zero, converting function-valued variables |
| 2864 | into parameterless calls. May expand *EXPP. The CONTEXT_TYPE functions |
| 2865 | are as in ada_resolve, above. */ |
| 2866 | |
| 2867 | static struct value * |
| 2868 | resolve_subexp (struct expression **expp, int *pos, int deprocedure_p, |
| 2869 | struct type *context_type) |
| 2870 | { |
| 2871 | int pc = *pos; |
| 2872 | int i; |
| 2873 | struct expression *exp; /* Convenience: == *expp. */ |
| 2874 | enum exp_opcode op = (*expp)->elts[pc].opcode; |
| 2875 | struct value **argvec; /* Vector of operand types (alloca'ed). */ |
| 2876 | int nargs; /* Number of operands. */ |
| 2877 | int oplen; |
| 2878 | |
| 2879 | argvec = NULL; |
| 2880 | nargs = 0; |
| 2881 | exp = *expp; |
| 2882 | |
| 2883 | /* Pass one: resolve operands, saving their types and updating *pos, |
| 2884 | if needed. */ |
| 2885 | switch (op) |
| 2886 | { |
| 2887 | case OP_FUNCALL: |
| 2888 | if (exp->elts[pc + 3].opcode == OP_VAR_VALUE |
| 2889 | && SYMBOL_DOMAIN (exp->elts[pc + 5].symbol) == UNDEF_DOMAIN) |
| 2890 | *pos += 7; |
| 2891 | else |
| 2892 | { |
| 2893 | *pos += 3; |
| 2894 | resolve_subexp (expp, pos, 0, NULL); |
| 2895 | } |
| 2896 | nargs = longest_to_int (exp->elts[pc + 1].longconst); |
| 2897 | break; |
| 2898 | |
| 2899 | case UNOP_ADDR: |
| 2900 | *pos += 1; |
| 2901 | resolve_subexp (expp, pos, 0, NULL); |
| 2902 | break; |
| 2903 | |
| 2904 | case UNOP_QUAL: |
| 2905 | *pos += 3; |
| 2906 | resolve_subexp (expp, pos, 1, check_typedef (exp->elts[pc + 1].type)); |
| 2907 | break; |
| 2908 | |
| 2909 | case OP_ATR_MODULUS: |
| 2910 | case OP_ATR_SIZE: |
| 2911 | case OP_ATR_TAG: |
| 2912 | case OP_ATR_FIRST: |
| 2913 | case OP_ATR_LAST: |
| 2914 | case OP_ATR_LENGTH: |
| 2915 | case OP_ATR_POS: |
| 2916 | case OP_ATR_VAL: |
| 2917 | case OP_ATR_MIN: |
| 2918 | case OP_ATR_MAX: |
| 2919 | case TERNOP_IN_RANGE: |
| 2920 | case BINOP_IN_BOUNDS: |
| 2921 | case UNOP_IN_RANGE: |
| 2922 | case OP_AGGREGATE: |
| 2923 | case OP_OTHERS: |
| 2924 | case OP_CHOICES: |
| 2925 | case OP_POSITIONAL: |
| 2926 | case OP_DISCRETE_RANGE: |
| 2927 | case OP_NAME: |
| 2928 | ada_forward_operator_length (exp, pc, &oplen, &nargs); |
| 2929 | *pos += oplen; |
| 2930 | break; |
| 2931 | |
| 2932 | case BINOP_ASSIGN: |
| 2933 | { |
| 2934 | struct value *arg1; |
| 2935 | |
| 2936 | *pos += 1; |
| 2937 | arg1 = resolve_subexp (expp, pos, 0, NULL); |
| 2938 | if (arg1 == NULL) |
| 2939 | resolve_subexp (expp, pos, 1, NULL); |
| 2940 | else |
| 2941 | resolve_subexp (expp, pos, 1, value_type (arg1)); |
| 2942 | break; |
| 2943 | } |
| 2944 | |
| 2945 | case UNOP_CAST: |
| 2946 | *pos += 3; |
| 2947 | nargs = 1; |
| 2948 | break; |
| 2949 | |
| 2950 | case BINOP_ADD: |
| 2951 | case BINOP_SUB: |
| 2952 | case BINOP_MUL: |
| 2953 | case BINOP_DIV: |
| 2954 | case BINOP_REM: |
| 2955 | case BINOP_MOD: |
| 2956 | case BINOP_EXP: |
| 2957 | case BINOP_CONCAT: |
| 2958 | case BINOP_LOGICAL_AND: |
| 2959 | case BINOP_LOGICAL_OR: |
| 2960 | case BINOP_BITWISE_AND: |
| 2961 | case BINOP_BITWISE_IOR: |
| 2962 | case BINOP_BITWISE_XOR: |
| 2963 | |
| 2964 | case BINOP_EQUAL: |
| 2965 | case BINOP_NOTEQUAL: |
| 2966 | case BINOP_LESS: |
| 2967 | case BINOP_GTR: |
| 2968 | case BINOP_LEQ: |
| 2969 | case BINOP_GEQ: |
| 2970 | |
| 2971 | case BINOP_REPEAT: |
| 2972 | case BINOP_SUBSCRIPT: |
| 2973 | case BINOP_COMMA: |
| 2974 | *pos += 1; |
| 2975 | nargs = 2; |
| 2976 | break; |
| 2977 | |
| 2978 | case UNOP_NEG: |
| 2979 | case UNOP_PLUS: |
| 2980 | case UNOP_LOGICAL_NOT: |
| 2981 | case UNOP_ABS: |
| 2982 | case UNOP_IND: |
| 2983 | *pos += 1; |
| 2984 | nargs = 1; |
| 2985 | break; |
| 2986 | |
| 2987 | case OP_LONG: |
| 2988 | case OP_DOUBLE: |
| 2989 | case OP_VAR_VALUE: |
| 2990 | *pos += 4; |
| 2991 | break; |
| 2992 | |
| 2993 | case OP_TYPE: |
| 2994 | case OP_BOOL: |
| 2995 | case OP_LAST: |
| 2996 | case OP_INTERNALVAR: |
| 2997 | *pos += 3; |
| 2998 | break; |
| 2999 | |
| 3000 | case UNOP_MEMVAL: |
| 3001 | *pos += 3; |
| 3002 | nargs = 1; |
| 3003 | break; |
| 3004 | |
| 3005 | case OP_REGISTER: |
| 3006 | *pos += 4 + BYTES_TO_EXP_ELEM (exp->elts[pc + 1].longconst + 1); |
| 3007 | break; |
| 3008 | |
| 3009 | case STRUCTOP_STRUCT: |
| 3010 | *pos += 4 + BYTES_TO_EXP_ELEM (exp->elts[pc + 1].longconst + 1); |
| 3011 | nargs = 1; |
| 3012 | break; |
| 3013 | |
| 3014 | case TERNOP_SLICE: |
| 3015 | *pos += 1; |
| 3016 | nargs = 3; |
| 3017 | break; |
| 3018 | |
| 3019 | case OP_STRING: |
| 3020 | break; |
| 3021 | |
| 3022 | default: |
| 3023 | error (_("Unexpected operator during name resolution")); |
| 3024 | } |
| 3025 | |
| 3026 | argvec = (struct value * *) alloca (sizeof (struct value *) * (nargs + 1)); |
| 3027 | for (i = 0; i < nargs; i += 1) |
| 3028 | argvec[i] = resolve_subexp (expp, pos, 1, NULL); |
| 3029 | argvec[i] = NULL; |
| 3030 | exp = *expp; |
| 3031 | |
| 3032 | /* Pass two: perform any resolution on principal operator. */ |
| 3033 | switch (op) |
| 3034 | { |
| 3035 | default: |
| 3036 | break; |
| 3037 | |
| 3038 | case OP_VAR_VALUE: |
| 3039 | if (SYMBOL_DOMAIN (exp->elts[pc + 2].symbol) == UNDEF_DOMAIN) |
| 3040 | { |
| 3041 | struct ada_symbol_info *candidates; |
| 3042 | int n_candidates; |
| 3043 | |
| 3044 | n_candidates = |
| 3045 | ada_lookup_symbol_list (SYMBOL_LINKAGE_NAME |
| 3046 | (exp->elts[pc + 2].symbol), |
| 3047 | exp->elts[pc + 1].block, VAR_DOMAIN, |
| 3048 | &candidates); |
| 3049 | |
| 3050 | if (n_candidates > 1) |
| 3051 | { |
| 3052 | /* Types tend to get re-introduced locally, so if there |
| 3053 | are any local symbols that are not types, first filter |
| 3054 | out all types. */ |
| 3055 | int j; |
| 3056 | for (j = 0; j < n_candidates; j += 1) |
| 3057 | switch (SYMBOL_CLASS (candidates[j].sym)) |
| 3058 | { |
| 3059 | case LOC_REGISTER: |
| 3060 | case LOC_ARG: |
| 3061 | case LOC_REF_ARG: |
| 3062 | case LOC_REGPARM_ADDR: |
| 3063 | case LOC_LOCAL: |
| 3064 | case LOC_COMPUTED: |
| 3065 | goto FoundNonType; |
| 3066 | default: |
| 3067 | break; |
| 3068 | } |
| 3069 | FoundNonType: |
| 3070 | if (j < n_candidates) |
| 3071 | { |
| 3072 | j = 0; |
| 3073 | while (j < n_candidates) |
| 3074 | { |
| 3075 | if (SYMBOL_CLASS (candidates[j].sym) == LOC_TYPEDEF) |
| 3076 | { |
| 3077 | candidates[j] = candidates[n_candidates - 1]; |
| 3078 | n_candidates -= 1; |
| 3079 | } |
| 3080 | else |
| 3081 | j += 1; |
| 3082 | } |
| 3083 | } |
| 3084 | } |
| 3085 | |
| 3086 | if (n_candidates == 0) |
| 3087 | error (_("No definition found for %s"), |
| 3088 | SYMBOL_PRINT_NAME (exp->elts[pc + 2].symbol)); |
| 3089 | else if (n_candidates == 1) |
| 3090 | i = 0; |
| 3091 | else if (deprocedure_p |
| 3092 | && !is_nonfunction (candidates, n_candidates)) |
| 3093 | { |
| 3094 | i = ada_resolve_function |
| 3095 | (candidates, n_candidates, NULL, 0, |
| 3096 | SYMBOL_LINKAGE_NAME (exp->elts[pc + 2].symbol), |
| 3097 | context_type); |
| 3098 | if (i < 0) |
| 3099 | error (_("Could not find a match for %s"), |
| 3100 | SYMBOL_PRINT_NAME (exp->elts[pc + 2].symbol)); |
| 3101 | } |
| 3102 | else |
| 3103 | { |
| 3104 | printf_filtered (_("Multiple matches for %s\n"), |
| 3105 | SYMBOL_PRINT_NAME (exp->elts[pc + 2].symbol)); |
| 3106 | user_select_syms (candidates, n_candidates, 1); |
| 3107 | i = 0; |
| 3108 | } |
| 3109 | |
| 3110 | exp->elts[pc + 1].block = candidates[i].block; |
| 3111 | exp->elts[pc + 2].symbol = candidates[i].sym; |
| 3112 | if (innermost_block == NULL |
| 3113 | || contained_in (candidates[i].block, innermost_block)) |
| 3114 | innermost_block = candidates[i].block; |
| 3115 | } |
| 3116 | |
| 3117 | if (deprocedure_p |
| 3118 | && (TYPE_CODE (SYMBOL_TYPE (exp->elts[pc + 2].symbol)) |
| 3119 | == TYPE_CODE_FUNC)) |
| 3120 | { |
| 3121 | replace_operator_with_call (expp, pc, 0, 0, |
| 3122 | exp->elts[pc + 2].symbol, |
| 3123 | exp->elts[pc + 1].block); |
| 3124 | exp = *expp; |
| 3125 | } |
| 3126 | break; |
| 3127 | |
| 3128 | case OP_FUNCALL: |
| 3129 | { |
| 3130 | if (exp->elts[pc + 3].opcode == OP_VAR_VALUE |
| 3131 | && SYMBOL_DOMAIN (exp->elts[pc + 5].symbol) == UNDEF_DOMAIN) |
| 3132 | { |
| 3133 | struct ada_symbol_info *candidates; |
| 3134 | int n_candidates; |
| 3135 | |
| 3136 | n_candidates = |
| 3137 | ada_lookup_symbol_list (SYMBOL_LINKAGE_NAME |
| 3138 | (exp->elts[pc + 5].symbol), |
| 3139 | exp->elts[pc + 4].block, VAR_DOMAIN, |
| 3140 | &candidates); |
| 3141 | if (n_candidates == 1) |
| 3142 | i = 0; |
| 3143 | else |
| 3144 | { |
| 3145 | i = ada_resolve_function |
| 3146 | (candidates, n_candidates, |
| 3147 | argvec, nargs, |
| 3148 | SYMBOL_LINKAGE_NAME (exp->elts[pc + 5].symbol), |
| 3149 | context_type); |
| 3150 | if (i < 0) |
| 3151 | error (_("Could not find a match for %s"), |
| 3152 | SYMBOL_PRINT_NAME (exp->elts[pc + 5].symbol)); |
| 3153 | } |
| 3154 | |
| 3155 | exp->elts[pc + 4].block = candidates[i].block; |
| 3156 | exp->elts[pc + 5].symbol = candidates[i].sym; |
| 3157 | if (innermost_block == NULL |
| 3158 | || contained_in (candidates[i].block, innermost_block)) |
| 3159 | innermost_block = candidates[i].block; |
| 3160 | } |
| 3161 | } |
| 3162 | break; |
| 3163 | case BINOP_ADD: |
| 3164 | case BINOP_SUB: |
| 3165 | case BINOP_MUL: |
| 3166 | case BINOP_DIV: |
| 3167 | case BINOP_REM: |
| 3168 | case BINOP_MOD: |
| 3169 | case BINOP_CONCAT: |
| 3170 | case BINOP_BITWISE_AND: |
| 3171 | case BINOP_BITWISE_IOR: |
| 3172 | case BINOP_BITWISE_XOR: |
| 3173 | case BINOP_EQUAL: |
| 3174 | case BINOP_NOTEQUAL: |
| 3175 | case BINOP_LESS: |
| 3176 | case BINOP_GTR: |
| 3177 | case BINOP_LEQ: |
| 3178 | case BINOP_GEQ: |
| 3179 | case BINOP_EXP: |
| 3180 | case UNOP_NEG: |
| 3181 | case UNOP_PLUS: |
| 3182 | case UNOP_LOGICAL_NOT: |
| 3183 | case UNOP_ABS: |
| 3184 | if (possible_user_operator_p (op, argvec)) |
| 3185 | { |
| 3186 | struct ada_symbol_info *candidates; |
| 3187 | int n_candidates; |
| 3188 | |
| 3189 | n_candidates = |
| 3190 | ada_lookup_symbol_list (ada_encode (ada_decoded_op_name (op)), |
| 3191 | (struct block *) NULL, VAR_DOMAIN, |
| 3192 | &candidates); |
| 3193 | i = ada_resolve_function (candidates, n_candidates, argvec, nargs, |
| 3194 | ada_decoded_op_name (op), NULL); |
| 3195 | if (i < 0) |
| 3196 | break; |
| 3197 | |
| 3198 | replace_operator_with_call (expp, pc, nargs, 1, |
| 3199 | candidates[i].sym, candidates[i].block); |
| 3200 | exp = *expp; |
| 3201 | } |
| 3202 | break; |
| 3203 | |
| 3204 | case OP_TYPE: |
| 3205 | case OP_REGISTER: |
| 3206 | return NULL; |
| 3207 | } |
| 3208 | |
| 3209 | *pos = pc; |
| 3210 | return evaluate_subexp_type (exp, pos); |
| 3211 | } |
| 3212 | |
| 3213 | /* Return non-zero if formal type FTYPE matches actual type ATYPE. If |
| 3214 | MAY_DEREF is non-zero, the formal may be a pointer and the actual |
| 3215 | a non-pointer. */ |
| 3216 | /* The term "match" here is rather loose. The match is heuristic and |
| 3217 | liberal. */ |
| 3218 | |
| 3219 | static int |
| 3220 | ada_type_match (struct type *ftype, struct type *atype, int may_deref) |
| 3221 | { |
| 3222 | ftype = ada_check_typedef (ftype); |
| 3223 | atype = ada_check_typedef (atype); |
| 3224 | |
| 3225 | if (TYPE_CODE (ftype) == TYPE_CODE_REF) |
| 3226 | ftype = TYPE_TARGET_TYPE (ftype); |
| 3227 | if (TYPE_CODE (atype) == TYPE_CODE_REF) |
| 3228 | atype = TYPE_TARGET_TYPE (atype); |
| 3229 | |
| 3230 | switch (TYPE_CODE (ftype)) |
| 3231 | { |
| 3232 | default: |
| 3233 | return TYPE_CODE (ftype) == TYPE_CODE (atype); |
| 3234 | case TYPE_CODE_PTR: |
| 3235 | if (TYPE_CODE (atype) == TYPE_CODE_PTR) |
| 3236 | return ada_type_match (TYPE_TARGET_TYPE (ftype), |
| 3237 | TYPE_TARGET_TYPE (atype), 0); |
| 3238 | else |
| 3239 | return (may_deref |
| 3240 | && ada_type_match (TYPE_TARGET_TYPE (ftype), atype, 0)); |
| 3241 | case TYPE_CODE_INT: |
| 3242 | case TYPE_CODE_ENUM: |
| 3243 | case TYPE_CODE_RANGE: |
| 3244 | switch (TYPE_CODE (atype)) |
| 3245 | { |
| 3246 | case TYPE_CODE_INT: |
| 3247 | case TYPE_CODE_ENUM: |
| 3248 | case TYPE_CODE_RANGE: |
| 3249 | return 1; |
| 3250 | default: |
| 3251 | return 0; |
| 3252 | } |
| 3253 | |
| 3254 | case TYPE_CODE_ARRAY: |
| 3255 | return (TYPE_CODE (atype) == TYPE_CODE_ARRAY |
| 3256 | || ada_is_array_descriptor_type (atype)); |
| 3257 | |
| 3258 | case TYPE_CODE_STRUCT: |
| 3259 | if (ada_is_array_descriptor_type (ftype)) |
| 3260 | return (TYPE_CODE (atype) == TYPE_CODE_ARRAY |
| 3261 | || ada_is_array_descriptor_type (atype)); |
| 3262 | else |
| 3263 | return (TYPE_CODE (atype) == TYPE_CODE_STRUCT |
| 3264 | && !ada_is_array_descriptor_type (atype)); |
| 3265 | |
| 3266 | case TYPE_CODE_UNION: |
| 3267 | case TYPE_CODE_FLT: |
| 3268 | return (TYPE_CODE (atype) == TYPE_CODE (ftype)); |
| 3269 | } |
| 3270 | } |
| 3271 | |
| 3272 | /* Return non-zero if the formals of FUNC "sufficiently match" the |
| 3273 | vector of actual argument types ACTUALS of size N_ACTUALS. FUNC |
| 3274 | may also be an enumeral, in which case it is treated as a 0- |
| 3275 | argument function. */ |
| 3276 | |
| 3277 | static int |
| 3278 | ada_args_match (struct symbol *func, struct value **actuals, int n_actuals) |
| 3279 | { |
| 3280 | int i; |
| 3281 | struct type *func_type = SYMBOL_TYPE (func); |
| 3282 | |
| 3283 | if (SYMBOL_CLASS (func) == LOC_CONST |
| 3284 | && TYPE_CODE (func_type) == TYPE_CODE_ENUM) |
| 3285 | return (n_actuals == 0); |
| 3286 | else if (func_type == NULL || TYPE_CODE (func_type) != TYPE_CODE_FUNC) |
| 3287 | return 0; |
| 3288 | |
| 3289 | if (TYPE_NFIELDS (func_type) != n_actuals) |
| 3290 | return 0; |
| 3291 | |
| 3292 | for (i = 0; i < n_actuals; i += 1) |
| 3293 | { |
| 3294 | if (actuals[i] == NULL) |
| 3295 | return 0; |
| 3296 | else |
| 3297 | { |
| 3298 | struct type *ftype = ada_check_typedef (TYPE_FIELD_TYPE (func_type, |
| 3299 | i)); |
| 3300 | struct type *atype = ada_check_typedef (value_type (actuals[i])); |
| 3301 | |
| 3302 | if (!ada_type_match (ftype, atype, 1)) |
| 3303 | return 0; |
| 3304 | } |
| 3305 | } |
| 3306 | return 1; |
| 3307 | } |
| 3308 | |
| 3309 | /* False iff function type FUNC_TYPE definitely does not produce a value |
| 3310 | compatible with type CONTEXT_TYPE. Conservatively returns 1 if |
| 3311 | FUNC_TYPE is not a valid function type with a non-null return type |
| 3312 | or an enumerated type. A null CONTEXT_TYPE indicates any non-void type. */ |
| 3313 | |
| 3314 | static int |
| 3315 | return_match (struct type *func_type, struct type *context_type) |
| 3316 | { |
| 3317 | struct type *return_type; |
| 3318 | |
| 3319 | if (func_type == NULL) |
| 3320 | return 1; |
| 3321 | |
| 3322 | if (TYPE_CODE (func_type) == TYPE_CODE_FUNC) |
| 3323 | return_type = base_type (TYPE_TARGET_TYPE (func_type)); |
| 3324 | else |
| 3325 | return_type = base_type (func_type); |
| 3326 | if (return_type == NULL) |
| 3327 | return 1; |
| 3328 | |
| 3329 | context_type = base_type (context_type); |
| 3330 | |
| 3331 | if (TYPE_CODE (return_type) == TYPE_CODE_ENUM) |
| 3332 | return context_type == NULL || return_type == context_type; |
| 3333 | else if (context_type == NULL) |
| 3334 | return TYPE_CODE (return_type) != TYPE_CODE_VOID; |
| 3335 | else |
| 3336 | return TYPE_CODE (return_type) == TYPE_CODE (context_type); |
| 3337 | } |
| 3338 | |
| 3339 | |
| 3340 | /* Returns the index in SYMS[0..NSYMS-1] that contains the symbol for the |
| 3341 | function (if any) that matches the types of the NARGS arguments in |
| 3342 | ARGS. If CONTEXT_TYPE is non-null and there is at least one match |
| 3343 | that returns that type, then eliminate matches that don't. If |
| 3344 | CONTEXT_TYPE is void and there is at least one match that does not |
| 3345 | return void, eliminate all matches that do. |
| 3346 | |
| 3347 | Asks the user if there is more than one match remaining. Returns -1 |
| 3348 | if there is no such symbol or none is selected. NAME is used |
| 3349 | solely for messages. May re-arrange and modify SYMS in |
| 3350 | the process; the index returned is for the modified vector. */ |
| 3351 | |
| 3352 | static int |
| 3353 | ada_resolve_function (struct ada_symbol_info syms[], |
| 3354 | int nsyms, struct value **args, int nargs, |
| 3355 | const char *name, struct type *context_type) |
| 3356 | { |
| 3357 | int fallback; |
| 3358 | int k; |
| 3359 | int m; /* Number of hits */ |
| 3360 | |
| 3361 | m = 0; |
| 3362 | /* In the first pass of the loop, we only accept functions matching |
| 3363 | context_type. If none are found, we add a second pass of the loop |
| 3364 | where every function is accepted. */ |
| 3365 | for (fallback = 0; m == 0 && fallback < 2; fallback++) |
| 3366 | { |
| 3367 | for (k = 0; k < nsyms; k += 1) |
| 3368 | { |
| 3369 | struct type *type = ada_check_typedef (SYMBOL_TYPE (syms[k].sym)); |
| 3370 | |
| 3371 | if (ada_args_match (syms[k].sym, args, nargs) |
| 3372 | && (fallback || return_match (type, context_type))) |
| 3373 | { |
| 3374 | syms[m] = syms[k]; |
| 3375 | m += 1; |
| 3376 | } |
| 3377 | } |
| 3378 | } |
| 3379 | |
| 3380 | if (m == 0) |
| 3381 | return -1; |
| 3382 | else if (m > 1) |
| 3383 | { |
| 3384 | printf_filtered (_("Multiple matches for %s\n"), name); |
| 3385 | user_select_syms (syms, m, 1); |
| 3386 | return 0; |
| 3387 | } |
| 3388 | return 0; |
| 3389 | } |
| 3390 | |
| 3391 | /* Returns true (non-zero) iff decoded name N0 should appear before N1 |
| 3392 | in a listing of choices during disambiguation (see sort_choices, below). |
| 3393 | The idea is that overloadings of a subprogram name from the |
| 3394 | same package should sort in their source order. We settle for ordering |
| 3395 | such symbols by their trailing number (__N or $N). */ |
| 3396 | |
| 3397 | static int |
| 3398 | encoded_ordered_before (char *N0, char *N1) |
| 3399 | { |
| 3400 | if (N1 == NULL) |
| 3401 | return 0; |
| 3402 | else if (N0 == NULL) |
| 3403 | return 1; |
| 3404 | else |
| 3405 | { |
| 3406 | int k0, k1; |
| 3407 | |
| 3408 | for (k0 = strlen (N0) - 1; k0 > 0 && isdigit (N0[k0]); k0 -= 1) |
| 3409 | ; |
| 3410 | for (k1 = strlen (N1) - 1; k1 > 0 && isdigit (N1[k1]); k1 -= 1) |
| 3411 | ; |
| 3412 | if ((N0[k0] == '_' || N0[k0] == '$') && N0[k0 + 1] != '\000' |
| 3413 | && (N1[k1] == '_' || N1[k1] == '$') && N1[k1 + 1] != '\000') |
| 3414 | { |
| 3415 | int n0, n1; |
| 3416 | |
| 3417 | n0 = k0; |
| 3418 | while (N0[n0] == '_' && n0 > 0 && N0[n0 - 1] == '_') |
| 3419 | n0 -= 1; |
| 3420 | n1 = k1; |
| 3421 | while (N1[n1] == '_' && n1 > 0 && N1[n1 - 1] == '_') |
| 3422 | n1 -= 1; |
| 3423 | if (n0 == n1 && strncmp (N0, N1, n0) == 0) |
| 3424 | return (atoi (N0 + k0 + 1) < atoi (N1 + k1 + 1)); |
| 3425 | } |
| 3426 | return (strcmp (N0, N1) < 0); |
| 3427 | } |
| 3428 | } |
| 3429 | |
| 3430 | /* Sort SYMS[0..NSYMS-1] to put the choices in a canonical order by the |
| 3431 | encoded names. */ |
| 3432 | |
| 3433 | static void |
| 3434 | sort_choices (struct ada_symbol_info syms[], int nsyms) |
| 3435 | { |
| 3436 | int i; |
| 3437 | |
| 3438 | for (i = 1; i < nsyms; i += 1) |
| 3439 | { |
| 3440 | struct ada_symbol_info sym = syms[i]; |
| 3441 | int j; |
| 3442 | |
| 3443 | for (j = i - 1; j >= 0; j -= 1) |
| 3444 | { |
| 3445 | if (encoded_ordered_before (SYMBOL_LINKAGE_NAME (syms[j].sym), |
| 3446 | SYMBOL_LINKAGE_NAME (sym.sym))) |
| 3447 | break; |
| 3448 | syms[j + 1] = syms[j]; |
| 3449 | } |
| 3450 | syms[j + 1] = sym; |
| 3451 | } |
| 3452 | } |
| 3453 | |
| 3454 | /* Given a list of NSYMS symbols in SYMS, select up to MAX_RESULTS>0 |
| 3455 | by asking the user (if necessary), returning the number selected, |
| 3456 | and setting the first elements of SYMS items. Error if no symbols |
| 3457 | selected. */ |
| 3458 | |
| 3459 | /* NOTE: Adapted from decode_line_2 in symtab.c, with which it ought |
| 3460 | to be re-integrated one of these days. */ |
| 3461 | |
| 3462 | int |
| 3463 | user_select_syms (struct ada_symbol_info *syms, int nsyms, int max_results) |
| 3464 | { |
| 3465 | int i; |
| 3466 | int *chosen = (int *) alloca (sizeof (int) * nsyms); |
| 3467 | int n_chosen; |
| 3468 | int first_choice = (max_results == 1) ? 1 : 2; |
| 3469 | const char *select_mode = multiple_symbols_select_mode (); |
| 3470 | |
| 3471 | if (max_results < 1) |
| 3472 | error (_("Request to select 0 symbols!")); |
| 3473 | if (nsyms <= 1) |
| 3474 | return nsyms; |
| 3475 | |
| 3476 | if (select_mode == multiple_symbols_cancel) |
| 3477 | error (_("\ |
| 3478 | canceled because the command is ambiguous\n\ |
| 3479 | See set/show multiple-symbol.")); |
| 3480 | |
| 3481 | /* If select_mode is "all", then return all possible symbols. |
| 3482 | Only do that if more than one symbol can be selected, of course. |
| 3483 | Otherwise, display the menu as usual. */ |
| 3484 | if (select_mode == multiple_symbols_all && max_results > 1) |
| 3485 | return nsyms; |
| 3486 | |
| 3487 | printf_unfiltered (_("[0] cancel\n")); |
| 3488 | if (max_results > 1) |
| 3489 | printf_unfiltered (_("[1] all\n")); |
| 3490 | |
| 3491 | sort_choices (syms, nsyms); |
| 3492 | |
| 3493 | for (i = 0; i < nsyms; i += 1) |
| 3494 | { |
| 3495 | if (syms[i].sym == NULL) |
| 3496 | continue; |
| 3497 | |
| 3498 | if (SYMBOL_CLASS (syms[i].sym) == LOC_BLOCK) |
| 3499 | { |
| 3500 | struct symtab_and_line sal = |
| 3501 | find_function_start_sal (syms[i].sym, 1); |
| 3502 | |
| 3503 | if (sal.symtab == NULL) |
| 3504 | printf_unfiltered (_("[%d] %s at <no source file available>:%d\n"), |
| 3505 | i + first_choice, |
| 3506 | SYMBOL_PRINT_NAME (syms[i].sym), |
| 3507 | sal.line); |
| 3508 | else |
| 3509 | printf_unfiltered (_("[%d] %s at %s:%d\n"), i + first_choice, |
| 3510 | SYMBOL_PRINT_NAME (syms[i].sym), |
| 3511 | sal.symtab->filename, sal.line); |
| 3512 | continue; |
| 3513 | } |
| 3514 | else |
| 3515 | { |
| 3516 | int is_enumeral = |
| 3517 | (SYMBOL_CLASS (syms[i].sym) == LOC_CONST |
| 3518 | && SYMBOL_TYPE (syms[i].sym) != NULL |
| 3519 | && TYPE_CODE (SYMBOL_TYPE (syms[i].sym)) == TYPE_CODE_ENUM); |
| 3520 | struct symtab *symtab = syms[i].sym->symtab; |
| 3521 | |
| 3522 | if (SYMBOL_LINE (syms[i].sym) != 0 && symtab != NULL) |
| 3523 | printf_unfiltered (_("[%d] %s at %s:%d\n"), |
| 3524 | i + first_choice, |
| 3525 | SYMBOL_PRINT_NAME (syms[i].sym), |
| 3526 | symtab->filename, SYMBOL_LINE (syms[i].sym)); |
| 3527 | else if (is_enumeral |
| 3528 | && TYPE_NAME (SYMBOL_TYPE (syms[i].sym)) != NULL) |
| 3529 | { |
| 3530 | printf_unfiltered (("[%d] "), i + first_choice); |
| 3531 | ada_print_type (SYMBOL_TYPE (syms[i].sym), NULL, |
| 3532 | gdb_stdout, -1, 0); |
| 3533 | printf_unfiltered (_("'(%s) (enumeral)\n"), |
| 3534 | SYMBOL_PRINT_NAME (syms[i].sym)); |
| 3535 | } |
| 3536 | else if (symtab != NULL) |
| 3537 | printf_unfiltered (is_enumeral |
| 3538 | ? _("[%d] %s in %s (enumeral)\n") |
| 3539 | : _("[%d] %s at %s:?\n"), |
| 3540 | i + first_choice, |
| 3541 | SYMBOL_PRINT_NAME (syms[i].sym), |
| 3542 | symtab->filename); |
| 3543 | else |
| 3544 | printf_unfiltered (is_enumeral |
| 3545 | ? _("[%d] %s (enumeral)\n") |
| 3546 | : _("[%d] %s at ?\n"), |
| 3547 | i + first_choice, |
| 3548 | SYMBOL_PRINT_NAME (syms[i].sym)); |
| 3549 | } |
| 3550 | } |
| 3551 | |
| 3552 | n_chosen = get_selections (chosen, nsyms, max_results, max_results > 1, |
| 3553 | "overload-choice"); |
| 3554 | |
| 3555 | for (i = 0; i < n_chosen; i += 1) |
| 3556 | syms[i] = syms[chosen[i]]; |
| 3557 | |
| 3558 | return n_chosen; |
| 3559 | } |
| 3560 | |
| 3561 | /* Read and validate a set of numeric choices from the user in the |
| 3562 | range 0 .. N_CHOICES-1. Place the results in increasing |
| 3563 | order in CHOICES[0 .. N-1], and return N. |
| 3564 | |
| 3565 | The user types choices as a sequence of numbers on one line |
| 3566 | separated by blanks, encoding them as follows: |
| 3567 | |
| 3568 | + A choice of 0 means to cancel the selection, throwing an error. |
| 3569 | + If IS_ALL_CHOICE, a choice of 1 selects the entire set 0 .. N_CHOICES-1. |
| 3570 | + The user chooses k by typing k+IS_ALL_CHOICE+1. |
| 3571 | |
| 3572 | The user is not allowed to choose more than MAX_RESULTS values. |
| 3573 | |
| 3574 | ANNOTATION_SUFFIX, if present, is used to annotate the input |
| 3575 | prompts (for use with the -f switch). */ |
| 3576 | |
| 3577 | int |
| 3578 | get_selections (int *choices, int n_choices, int max_results, |
| 3579 | int is_all_choice, char *annotation_suffix) |
| 3580 | { |
| 3581 | char *args; |
| 3582 | char *prompt; |
| 3583 | int n_chosen; |
| 3584 | int first_choice = is_all_choice ? 2 : 1; |
| 3585 | |
| 3586 | prompt = getenv ("PS2"); |
| 3587 | if (prompt == NULL) |
| 3588 | prompt = "> "; |
| 3589 | |
| 3590 | args = command_line_input (prompt, 0, annotation_suffix); |
| 3591 | |
| 3592 | if (args == NULL) |
| 3593 | error_no_arg (_("one or more choice numbers")); |
| 3594 | |
| 3595 | n_chosen = 0; |
| 3596 | |
| 3597 | /* Set choices[0 .. n_chosen-1] to the users' choices in ascending |
| 3598 | order, as given in args. Choices are validated. */ |
| 3599 | while (1) |
| 3600 | { |
| 3601 | char *args2; |
| 3602 | int choice, j; |
| 3603 | |
| 3604 | while (isspace (*args)) |
| 3605 | args += 1; |
| 3606 | if (*args == '\0' && n_chosen == 0) |
| 3607 | error_no_arg (_("one or more choice numbers")); |
| 3608 | else if (*args == '\0') |
| 3609 | break; |
| 3610 | |
| 3611 | choice = strtol (args, &args2, 10); |
| 3612 | if (args == args2 || choice < 0 |
| 3613 | || choice > n_choices + first_choice - 1) |
| 3614 | error (_("Argument must be choice number")); |
| 3615 | args = args2; |
| 3616 | |
| 3617 | if (choice == 0) |
| 3618 | error (_("cancelled")); |
| 3619 | |
| 3620 | if (choice < first_choice) |
| 3621 | { |
| 3622 | n_chosen = n_choices; |
| 3623 | for (j = 0; j < n_choices; j += 1) |
| 3624 | choices[j] = j; |
| 3625 | break; |
| 3626 | } |
| 3627 | choice -= first_choice; |
| 3628 | |
| 3629 | for (j = n_chosen - 1; j >= 0 && choice < choices[j]; j -= 1) |
| 3630 | { |
| 3631 | } |
| 3632 | |
| 3633 | if (j < 0 || choice != choices[j]) |
| 3634 | { |
| 3635 | int k; |
| 3636 | |
| 3637 | for (k = n_chosen - 1; k > j; k -= 1) |
| 3638 | choices[k + 1] = choices[k]; |
| 3639 | choices[j + 1] = choice; |
| 3640 | n_chosen += 1; |
| 3641 | } |
| 3642 | } |
| 3643 | |
| 3644 | if (n_chosen > max_results) |
| 3645 | error (_("Select no more than %d of the above"), max_results); |
| 3646 | |
| 3647 | return n_chosen; |
| 3648 | } |
| 3649 | |
| 3650 | /* Replace the operator of length OPLEN at position PC in *EXPP with a call |
| 3651 | on the function identified by SYM and BLOCK, and taking NARGS |
| 3652 | arguments. Update *EXPP as needed to hold more space. */ |
| 3653 | |
| 3654 | static void |
| 3655 | replace_operator_with_call (struct expression **expp, int pc, int nargs, |
| 3656 | int oplen, struct symbol *sym, |
| 3657 | struct block *block) |
| 3658 | { |
| 3659 | /* A new expression, with 6 more elements (3 for funcall, 4 for function |
| 3660 | symbol, -oplen for operator being replaced). */ |
| 3661 | struct expression *newexp = (struct expression *) |
| 3662 | xzalloc (sizeof (struct expression) |
| 3663 | + EXP_ELEM_TO_BYTES ((*expp)->nelts + 7 - oplen)); |
| 3664 | struct expression *exp = *expp; |
| 3665 | |
| 3666 | newexp->nelts = exp->nelts + 7 - oplen; |
| 3667 | newexp->language_defn = exp->language_defn; |
| 3668 | newexp->gdbarch = exp->gdbarch; |
| 3669 | memcpy (newexp->elts, exp->elts, EXP_ELEM_TO_BYTES (pc)); |
| 3670 | memcpy (newexp->elts + pc + 7, exp->elts + pc + oplen, |
| 3671 | EXP_ELEM_TO_BYTES (exp->nelts - pc - oplen)); |
| 3672 | |
| 3673 | newexp->elts[pc].opcode = newexp->elts[pc + 2].opcode = OP_FUNCALL; |
| 3674 | newexp->elts[pc + 1].longconst = (LONGEST) nargs; |
| 3675 | |
| 3676 | newexp->elts[pc + 3].opcode = newexp->elts[pc + 6].opcode = OP_VAR_VALUE; |
| 3677 | newexp->elts[pc + 4].block = block; |
| 3678 | newexp->elts[pc + 5].symbol = sym; |
| 3679 | |
| 3680 | *expp = newexp; |
| 3681 | xfree (exp); |
| 3682 | } |
| 3683 | |
| 3684 | /* Type-class predicates */ |
| 3685 | |
| 3686 | /* True iff TYPE is numeric (i.e., an INT, RANGE (of numeric type), |
| 3687 | or FLOAT). */ |
| 3688 | |
| 3689 | static int |
| 3690 | numeric_type_p (struct type *type) |
| 3691 | { |
| 3692 | if (type == NULL) |
| 3693 | return 0; |
| 3694 | else |
| 3695 | { |
| 3696 | switch (TYPE_CODE (type)) |
| 3697 | { |
| 3698 | case TYPE_CODE_INT: |
| 3699 | case TYPE_CODE_FLT: |
| 3700 | return 1; |
| 3701 | case TYPE_CODE_RANGE: |
| 3702 | return (type == TYPE_TARGET_TYPE (type) |
| 3703 | || numeric_type_p (TYPE_TARGET_TYPE (type))); |
| 3704 | default: |
| 3705 | return 0; |
| 3706 | } |
| 3707 | } |
| 3708 | } |
| 3709 | |
| 3710 | /* True iff TYPE is integral (an INT or RANGE of INTs). */ |
| 3711 | |
| 3712 | static int |
| 3713 | integer_type_p (struct type *type) |
| 3714 | { |
| 3715 | if (type == NULL) |
| 3716 | return 0; |
| 3717 | else |
| 3718 | { |
| 3719 | switch (TYPE_CODE (type)) |
| 3720 | { |
| 3721 | case TYPE_CODE_INT: |
| 3722 | return 1; |
| 3723 | case TYPE_CODE_RANGE: |
| 3724 | return (type == TYPE_TARGET_TYPE (type) |
| 3725 | || integer_type_p (TYPE_TARGET_TYPE (type))); |
| 3726 | default: |
| 3727 | return 0; |
| 3728 | } |
| 3729 | } |
| 3730 | } |
| 3731 | |
| 3732 | /* True iff TYPE is scalar (INT, RANGE, FLOAT, ENUM). */ |
| 3733 | |
| 3734 | static int |
| 3735 | scalar_type_p (struct type *type) |
| 3736 | { |
| 3737 | if (type == NULL) |
| 3738 | return 0; |
| 3739 | else |
| 3740 | { |
| 3741 | switch (TYPE_CODE (type)) |
| 3742 | { |
| 3743 | case TYPE_CODE_INT: |
| 3744 | case TYPE_CODE_RANGE: |
| 3745 | case TYPE_CODE_ENUM: |
| 3746 | case TYPE_CODE_FLT: |
| 3747 | return 1; |
| 3748 | default: |
| 3749 | return 0; |
| 3750 | } |
| 3751 | } |
| 3752 | } |
| 3753 | |
| 3754 | /* True iff TYPE is discrete (INT, RANGE, ENUM). */ |
| 3755 | |
| 3756 | static int |
| 3757 | discrete_type_p (struct type *type) |
| 3758 | { |
| 3759 | if (type == NULL) |
| 3760 | return 0; |
| 3761 | else |
| 3762 | { |
| 3763 | switch (TYPE_CODE (type)) |
| 3764 | { |
| 3765 | case TYPE_CODE_INT: |
| 3766 | case TYPE_CODE_RANGE: |
| 3767 | case TYPE_CODE_ENUM: |
| 3768 | case TYPE_CODE_BOOL: |
| 3769 | return 1; |
| 3770 | default: |
| 3771 | return 0; |
| 3772 | } |
| 3773 | } |
| 3774 | } |
| 3775 | |
| 3776 | /* Returns non-zero if OP with operands in the vector ARGS could be |
| 3777 | a user-defined function. Errs on the side of pre-defined operators |
| 3778 | (i.e., result 0). */ |
| 3779 | |
| 3780 | static int |
| 3781 | possible_user_operator_p (enum exp_opcode op, struct value *args[]) |
| 3782 | { |
| 3783 | struct type *type0 = |
| 3784 | (args[0] == NULL) ? NULL : ada_check_typedef (value_type (args[0])); |
| 3785 | struct type *type1 = |
| 3786 | (args[1] == NULL) ? NULL : ada_check_typedef (value_type (args[1])); |
| 3787 | |
| 3788 | if (type0 == NULL) |
| 3789 | return 0; |
| 3790 | |
| 3791 | switch (op) |
| 3792 | { |
| 3793 | default: |
| 3794 | return 0; |
| 3795 | |
| 3796 | case BINOP_ADD: |
| 3797 | case BINOP_SUB: |
| 3798 | case BINOP_MUL: |
| 3799 | case BINOP_DIV: |
| 3800 | return (!(numeric_type_p (type0) && numeric_type_p (type1))); |
| 3801 | |
| 3802 | case BINOP_REM: |
| 3803 | case BINOP_MOD: |
| 3804 | case BINOP_BITWISE_AND: |
| 3805 | case BINOP_BITWISE_IOR: |
| 3806 | case BINOP_BITWISE_XOR: |
| 3807 | return (!(integer_type_p (type0) && integer_type_p (type1))); |
| 3808 | |
| 3809 | case BINOP_EQUAL: |
| 3810 | case BINOP_NOTEQUAL: |
| 3811 | case BINOP_LESS: |
| 3812 | case BINOP_GTR: |
| 3813 | case BINOP_LEQ: |
| 3814 | case BINOP_GEQ: |
| 3815 | return (!(scalar_type_p (type0) && scalar_type_p (type1))); |
| 3816 | |
| 3817 | case BINOP_CONCAT: |
| 3818 | return !ada_is_array_type (type0) || !ada_is_array_type (type1); |
| 3819 | |
| 3820 | case BINOP_EXP: |
| 3821 | return (!(numeric_type_p (type0) && integer_type_p (type1))); |
| 3822 | |
| 3823 | case UNOP_NEG: |
| 3824 | case UNOP_PLUS: |
| 3825 | case UNOP_LOGICAL_NOT: |
| 3826 | case UNOP_ABS: |
| 3827 | return (!numeric_type_p (type0)); |
| 3828 | |
| 3829 | } |
| 3830 | } |
| 3831 | \f |
| 3832 | /* Renaming */ |
| 3833 | |
| 3834 | /* NOTES: |
| 3835 | |
| 3836 | 1. In the following, we assume that a renaming type's name may |
| 3837 | have an ___XD suffix. It would be nice if this went away at some |
| 3838 | point. |
| 3839 | 2. We handle both the (old) purely type-based representation of |
| 3840 | renamings and the (new) variable-based encoding. At some point, |
| 3841 | it is devoutly to be hoped that the former goes away |
| 3842 | (FIXME: hilfinger-2007-07-09). |
| 3843 | 3. Subprogram renamings are not implemented, although the XRS |
| 3844 | suffix is recognized (FIXME: hilfinger-2007-07-09). */ |
| 3845 | |
| 3846 | /* If SYM encodes a renaming, |
| 3847 | |
| 3848 | <renaming> renames <renamed entity>, |
| 3849 | |
| 3850 | sets *LEN to the length of the renamed entity's name, |
| 3851 | *RENAMED_ENTITY to that name (not null-terminated), and *RENAMING_EXPR to |
| 3852 | the string describing the subcomponent selected from the renamed |
| 3853 | entity. Returns ADA_NOT_RENAMING if SYM does not encode a renaming |
| 3854 | (in which case, the values of *RENAMED_ENTITY, *LEN, and *RENAMING_EXPR |
| 3855 | are undefined). Otherwise, returns a value indicating the category |
| 3856 | of entity renamed: an object (ADA_OBJECT_RENAMING), exception |
| 3857 | (ADA_EXCEPTION_RENAMING), package (ADA_PACKAGE_RENAMING), or |
| 3858 | subprogram (ADA_SUBPROGRAM_RENAMING). Does no allocation; the |
| 3859 | strings returned in *RENAMED_ENTITY and *RENAMING_EXPR should not be |
| 3860 | deallocated. The values of RENAMED_ENTITY, LEN, or RENAMING_EXPR |
| 3861 | may be NULL, in which case they are not assigned. |
| 3862 | |
| 3863 | [Currently, however, GCC does not generate subprogram renamings.] */ |
| 3864 | |
| 3865 | enum ada_renaming_category |
| 3866 | ada_parse_renaming (struct symbol *sym, |
| 3867 | const char **renamed_entity, int *len, |
| 3868 | const char **renaming_expr) |
| 3869 | { |
| 3870 | enum ada_renaming_category kind; |
| 3871 | const char *info; |
| 3872 | const char *suffix; |
| 3873 | |
| 3874 | if (sym == NULL) |
| 3875 | return ADA_NOT_RENAMING; |
| 3876 | switch (SYMBOL_CLASS (sym)) |
| 3877 | { |
| 3878 | default: |
| 3879 | return ADA_NOT_RENAMING; |
| 3880 | case LOC_TYPEDEF: |
| 3881 | return parse_old_style_renaming (SYMBOL_TYPE (sym), |
| 3882 | renamed_entity, len, renaming_expr); |
| 3883 | case LOC_LOCAL: |
| 3884 | case LOC_STATIC: |
| 3885 | case LOC_COMPUTED: |
| 3886 | case LOC_OPTIMIZED_OUT: |
| 3887 | info = strstr (SYMBOL_LINKAGE_NAME (sym), "___XR"); |
| 3888 | if (info == NULL) |
| 3889 | return ADA_NOT_RENAMING; |
| 3890 | switch (info[5]) |
| 3891 | { |
| 3892 | case '_': |
| 3893 | kind = ADA_OBJECT_RENAMING; |
| 3894 | info += 6; |
| 3895 | break; |
| 3896 | case 'E': |
| 3897 | kind = ADA_EXCEPTION_RENAMING; |
| 3898 | info += 7; |
| 3899 | break; |
| 3900 | case 'P': |
| 3901 | kind = ADA_PACKAGE_RENAMING; |
| 3902 | info += 7; |
| 3903 | break; |
| 3904 | case 'S': |
| 3905 | kind = ADA_SUBPROGRAM_RENAMING; |
| 3906 | info += 7; |
| 3907 | break; |
| 3908 | default: |
| 3909 | return ADA_NOT_RENAMING; |
| 3910 | } |
| 3911 | } |
| 3912 | |
| 3913 | if (renamed_entity != NULL) |
| 3914 | *renamed_entity = info; |
| 3915 | suffix = strstr (info, "___XE"); |
| 3916 | if (suffix == NULL || suffix == info) |
| 3917 | return ADA_NOT_RENAMING; |
| 3918 | if (len != NULL) |
| 3919 | *len = strlen (info) - strlen (suffix); |
| 3920 | suffix += 5; |
| 3921 | if (renaming_expr != NULL) |
| 3922 | *renaming_expr = suffix; |
| 3923 | return kind; |
| 3924 | } |
| 3925 | |
| 3926 | /* Assuming TYPE encodes a renaming according to the old encoding in |
| 3927 | exp_dbug.ads, returns details of that renaming in *RENAMED_ENTITY, |
| 3928 | *LEN, and *RENAMING_EXPR, as for ada_parse_renaming, above. Returns |
| 3929 | ADA_NOT_RENAMING otherwise. */ |
| 3930 | static enum ada_renaming_category |
| 3931 | parse_old_style_renaming (struct type *type, |
| 3932 | const char **renamed_entity, int *len, |
| 3933 | const char **renaming_expr) |
| 3934 | { |
| 3935 | enum ada_renaming_category kind; |
| 3936 | const char *name; |
| 3937 | const char *info; |
| 3938 | const char *suffix; |
| 3939 | |
| 3940 | if (type == NULL || TYPE_CODE (type) != TYPE_CODE_ENUM |
| 3941 | || TYPE_NFIELDS (type) != 1) |
| 3942 | return ADA_NOT_RENAMING; |
| 3943 | |
| 3944 | name = type_name_no_tag (type); |
| 3945 | if (name == NULL) |
| 3946 | return ADA_NOT_RENAMING; |
| 3947 | |
| 3948 | name = strstr (name, "___XR"); |
| 3949 | if (name == NULL) |
| 3950 | return ADA_NOT_RENAMING; |
| 3951 | switch (name[5]) |
| 3952 | { |
| 3953 | case '\0': |
| 3954 | case '_': |
| 3955 | kind = ADA_OBJECT_RENAMING; |
| 3956 | break; |
| 3957 | case 'E': |
| 3958 | kind = ADA_EXCEPTION_RENAMING; |
| 3959 | break; |
| 3960 | case 'P': |
| 3961 | kind = ADA_PACKAGE_RENAMING; |
| 3962 | break; |
| 3963 | case 'S': |
| 3964 | kind = ADA_SUBPROGRAM_RENAMING; |
| 3965 | break; |
| 3966 | default: |
| 3967 | return ADA_NOT_RENAMING; |
| 3968 | } |
| 3969 | |
| 3970 | info = TYPE_FIELD_NAME (type, 0); |
| 3971 | if (info == NULL) |
| 3972 | return ADA_NOT_RENAMING; |
| 3973 | if (renamed_entity != NULL) |
| 3974 | *renamed_entity = info; |
| 3975 | suffix = strstr (info, "___XE"); |
| 3976 | if (renaming_expr != NULL) |
| 3977 | *renaming_expr = suffix + 5; |
| 3978 | if (suffix == NULL || suffix == info) |
| 3979 | return ADA_NOT_RENAMING; |
| 3980 | if (len != NULL) |
| 3981 | *len = suffix - info; |
| 3982 | return kind; |
| 3983 | } |
| 3984 | |
| 3985 | \f |
| 3986 | |
| 3987 | /* Evaluation: Function Calls */ |
| 3988 | |
| 3989 | /* Return an lvalue containing the value VAL. This is the identity on |
| 3990 | lvalues, and otherwise has the side-effect of allocating memory |
| 3991 | in the inferior where a copy of the value contents is copied. */ |
| 3992 | |
| 3993 | static struct value * |
| 3994 | ensure_lval (struct value *val) |
| 3995 | { |
| 3996 | if (VALUE_LVAL (val) == not_lval |
| 3997 | || VALUE_LVAL (val) == lval_internalvar) |
| 3998 | { |
| 3999 | int len = TYPE_LENGTH (ada_check_typedef (value_type (val))); |
| 4000 | const CORE_ADDR addr = |
| 4001 | value_as_long (value_allocate_space_in_inferior (len)); |
| 4002 | |
| 4003 | set_value_address (val, addr); |
| 4004 | VALUE_LVAL (val) = lval_memory; |
| 4005 | write_memory (addr, value_contents (val), len); |
| 4006 | } |
| 4007 | |
| 4008 | return val; |
| 4009 | } |
| 4010 | |
| 4011 | /* Return the value ACTUAL, converted to be an appropriate value for a |
| 4012 | formal of type FORMAL_TYPE. Use *SP as a stack pointer for |
| 4013 | allocating any necessary descriptors (fat pointers), or copies of |
| 4014 | values not residing in memory, updating it as needed. */ |
| 4015 | |
| 4016 | struct value * |
| 4017 | ada_convert_actual (struct value *actual, struct type *formal_type0) |
| 4018 | { |
| 4019 | struct type *actual_type = ada_check_typedef (value_type (actual)); |
| 4020 | struct type *formal_type = ada_check_typedef (formal_type0); |
| 4021 | struct type *formal_target = |
| 4022 | TYPE_CODE (formal_type) == TYPE_CODE_PTR |
| 4023 | ? ada_check_typedef (TYPE_TARGET_TYPE (formal_type)) : formal_type; |
| 4024 | struct type *actual_target = |
| 4025 | TYPE_CODE (actual_type) == TYPE_CODE_PTR |
| 4026 | ? ada_check_typedef (TYPE_TARGET_TYPE (actual_type)) : actual_type; |
| 4027 | |
| 4028 | if (ada_is_array_descriptor_type (formal_target) |
| 4029 | && TYPE_CODE (actual_target) == TYPE_CODE_ARRAY) |
| 4030 | return make_array_descriptor (formal_type, actual); |
| 4031 | else if (TYPE_CODE (formal_type) == TYPE_CODE_PTR |
| 4032 | || TYPE_CODE (formal_type) == TYPE_CODE_REF) |
| 4033 | { |
| 4034 | struct value *result; |
| 4035 | |
| 4036 | if (TYPE_CODE (formal_target) == TYPE_CODE_ARRAY |
| 4037 | && ada_is_array_descriptor_type (actual_target)) |
| 4038 | result = desc_data (actual); |
| 4039 | else if (TYPE_CODE (actual_type) != TYPE_CODE_PTR) |
| 4040 | { |
| 4041 | if (VALUE_LVAL (actual) != lval_memory) |
| 4042 | { |
| 4043 | struct value *val; |
| 4044 | |
| 4045 | actual_type = ada_check_typedef (value_type (actual)); |
| 4046 | val = allocate_value (actual_type); |
| 4047 | memcpy ((char *) value_contents_raw (val), |
| 4048 | (char *) value_contents (actual), |
| 4049 | TYPE_LENGTH (actual_type)); |
| 4050 | actual = ensure_lval (val); |
| 4051 | } |
| 4052 | result = value_addr (actual); |
| 4053 | } |
| 4054 | else |
| 4055 | return actual; |
| 4056 | return value_cast_pointers (formal_type, result); |
| 4057 | } |
| 4058 | else if (TYPE_CODE (actual_type) == TYPE_CODE_PTR) |
| 4059 | return ada_value_ind (actual); |
| 4060 | |
| 4061 | return actual; |
| 4062 | } |
| 4063 | |
| 4064 | /* Convert VALUE (which must be an address) to a CORE_ADDR that is a pointer of |
| 4065 | type TYPE. This is usually an inefficient no-op except on some targets |
| 4066 | (such as AVR) where the representation of a pointer and an address |
| 4067 | differs. */ |
| 4068 | |
| 4069 | static CORE_ADDR |
| 4070 | value_pointer (struct value *value, struct type *type) |
| 4071 | { |
| 4072 | struct gdbarch *gdbarch = get_type_arch (type); |
| 4073 | unsigned len = TYPE_LENGTH (type); |
| 4074 | gdb_byte *buf = alloca (len); |
| 4075 | CORE_ADDR addr; |
| 4076 | |
| 4077 | addr = value_address (value); |
| 4078 | gdbarch_address_to_pointer (gdbarch, type, buf, addr); |
| 4079 | addr = extract_unsigned_integer (buf, len, gdbarch_byte_order (gdbarch)); |
| 4080 | return addr; |
| 4081 | } |
| 4082 | |
| 4083 | |
| 4084 | /* Push a descriptor of type TYPE for array value ARR on the stack at |
| 4085 | *SP, updating *SP to reflect the new descriptor. Return either |
| 4086 | an lvalue representing the new descriptor, or (if TYPE is a pointer- |
| 4087 | to-descriptor type rather than a descriptor type), a struct value * |
| 4088 | representing a pointer to this descriptor. */ |
| 4089 | |
| 4090 | static struct value * |
| 4091 | make_array_descriptor (struct type *type, struct value *arr) |
| 4092 | { |
| 4093 | struct type *bounds_type = desc_bounds_type (type); |
| 4094 | struct type *desc_type = desc_base_type (type); |
| 4095 | struct value *descriptor = allocate_value (desc_type); |
| 4096 | struct value *bounds = allocate_value (bounds_type); |
| 4097 | int i; |
| 4098 | |
| 4099 | for (i = ada_array_arity (ada_check_typedef (value_type (arr))); |
| 4100 | i > 0; i -= 1) |
| 4101 | { |
| 4102 | modify_field (value_type (bounds), value_contents_writeable (bounds), |
| 4103 | ada_array_bound (arr, i, 0), |
| 4104 | desc_bound_bitpos (bounds_type, i, 0), |
| 4105 | desc_bound_bitsize (bounds_type, i, 0)); |
| 4106 | modify_field (value_type (bounds), value_contents_writeable (bounds), |
| 4107 | ada_array_bound (arr, i, 1), |
| 4108 | desc_bound_bitpos (bounds_type, i, 1), |
| 4109 | desc_bound_bitsize (bounds_type, i, 1)); |
| 4110 | } |
| 4111 | |
| 4112 | bounds = ensure_lval (bounds); |
| 4113 | |
| 4114 | modify_field (value_type (descriptor), |
| 4115 | value_contents_writeable (descriptor), |
| 4116 | value_pointer (ensure_lval (arr), |
| 4117 | TYPE_FIELD_TYPE (desc_type, 0)), |
| 4118 | fat_pntr_data_bitpos (desc_type), |
| 4119 | fat_pntr_data_bitsize (desc_type)); |
| 4120 | |
| 4121 | modify_field (value_type (descriptor), |
| 4122 | value_contents_writeable (descriptor), |
| 4123 | value_pointer (bounds, |
| 4124 | TYPE_FIELD_TYPE (desc_type, 1)), |
| 4125 | fat_pntr_bounds_bitpos (desc_type), |
| 4126 | fat_pntr_bounds_bitsize (desc_type)); |
| 4127 | |
| 4128 | descriptor = ensure_lval (descriptor); |
| 4129 | |
| 4130 | if (TYPE_CODE (type) == TYPE_CODE_PTR) |
| 4131 | return value_addr (descriptor); |
| 4132 | else |
| 4133 | return descriptor; |
| 4134 | } |
| 4135 | \f |
| 4136 | /* Dummy definitions for an experimental caching module that is not |
| 4137 | * used in the public sources. */ |
| 4138 | |
| 4139 | static int |
| 4140 | lookup_cached_symbol (const char *name, domain_enum namespace, |
| 4141 | struct symbol **sym, struct block **block) |
| 4142 | { |
| 4143 | return 0; |
| 4144 | } |
| 4145 | |
| 4146 | static void |
| 4147 | cache_symbol (const char *name, domain_enum namespace, struct symbol *sym, |
| 4148 | struct block *block) |
| 4149 | { |
| 4150 | } |
| 4151 | \f |
| 4152 | /* Symbol Lookup */ |
| 4153 | |
| 4154 | /* Return the result of a standard (literal, C-like) lookup of NAME in |
| 4155 | given DOMAIN, visible from lexical block BLOCK. */ |
| 4156 | |
| 4157 | static struct symbol * |
| 4158 | standard_lookup (const char *name, const struct block *block, |
| 4159 | domain_enum domain) |
| 4160 | { |
| 4161 | struct symbol *sym; |
| 4162 | |
| 4163 | if (lookup_cached_symbol (name, domain, &sym, NULL)) |
| 4164 | return sym; |
| 4165 | sym = lookup_symbol_in_language (name, block, domain, language_c, 0); |
| 4166 | cache_symbol (name, domain, sym, block_found); |
| 4167 | return sym; |
| 4168 | } |
| 4169 | |
| 4170 | |
| 4171 | /* Non-zero iff there is at least one non-function/non-enumeral symbol |
| 4172 | in the symbol fields of SYMS[0..N-1]. We treat enumerals as functions, |
| 4173 | since they contend in overloading in the same way. */ |
| 4174 | static int |
| 4175 | is_nonfunction (struct ada_symbol_info syms[], int n) |
| 4176 | { |
| 4177 | int i; |
| 4178 | |
| 4179 | for (i = 0; i < n; i += 1) |
| 4180 | if (TYPE_CODE (SYMBOL_TYPE (syms[i].sym)) != TYPE_CODE_FUNC |
| 4181 | && (TYPE_CODE (SYMBOL_TYPE (syms[i].sym)) != TYPE_CODE_ENUM |
| 4182 | || SYMBOL_CLASS (syms[i].sym) != LOC_CONST)) |
| 4183 | return 1; |
| 4184 | |
| 4185 | return 0; |
| 4186 | } |
| 4187 | |
| 4188 | /* If true (non-zero), then TYPE0 and TYPE1 represent equivalent |
| 4189 | struct types. Otherwise, they may not. */ |
| 4190 | |
| 4191 | static int |
| 4192 | equiv_types (struct type *type0, struct type *type1) |
| 4193 | { |
| 4194 | if (type0 == type1) |
| 4195 | return 1; |
| 4196 | if (type0 == NULL || type1 == NULL |
| 4197 | || TYPE_CODE (type0) != TYPE_CODE (type1)) |
| 4198 | return 0; |
| 4199 | if ((TYPE_CODE (type0) == TYPE_CODE_STRUCT |
| 4200 | || TYPE_CODE (type0) == TYPE_CODE_ENUM) |
| 4201 | && ada_type_name (type0) != NULL && ada_type_name (type1) != NULL |
| 4202 | && strcmp (ada_type_name (type0), ada_type_name (type1)) == 0) |
| 4203 | return 1; |
| 4204 | |
| 4205 | return 0; |
| 4206 | } |
| 4207 | |
| 4208 | /* True iff SYM0 represents the same entity as SYM1, or one that is |
| 4209 | no more defined than that of SYM1. */ |
| 4210 | |
| 4211 | static int |
| 4212 | lesseq_defined_than (struct symbol *sym0, struct symbol *sym1) |
| 4213 | { |
| 4214 | if (sym0 == sym1) |
| 4215 | return 1; |
| 4216 | if (SYMBOL_DOMAIN (sym0) != SYMBOL_DOMAIN (sym1) |
| 4217 | || SYMBOL_CLASS (sym0) != SYMBOL_CLASS (sym1)) |
| 4218 | return 0; |
| 4219 | |
| 4220 | switch (SYMBOL_CLASS (sym0)) |
| 4221 | { |
| 4222 | case LOC_UNDEF: |
| 4223 | return 1; |
| 4224 | case LOC_TYPEDEF: |
| 4225 | { |
| 4226 | struct type *type0 = SYMBOL_TYPE (sym0); |
| 4227 | struct type *type1 = SYMBOL_TYPE (sym1); |
| 4228 | char *name0 = SYMBOL_LINKAGE_NAME (sym0); |
| 4229 | char *name1 = SYMBOL_LINKAGE_NAME (sym1); |
| 4230 | int len0 = strlen (name0); |
| 4231 | |
| 4232 | return |
| 4233 | TYPE_CODE (type0) == TYPE_CODE (type1) |
| 4234 | && (equiv_types (type0, type1) |
| 4235 | || (len0 < strlen (name1) && strncmp (name0, name1, len0) == 0 |
| 4236 | && strncmp (name1 + len0, "___XV", 5) == 0)); |
| 4237 | } |
| 4238 | case LOC_CONST: |
| 4239 | return SYMBOL_VALUE (sym0) == SYMBOL_VALUE (sym1) |
| 4240 | && equiv_types (SYMBOL_TYPE (sym0), SYMBOL_TYPE (sym1)); |
| 4241 | default: |
| 4242 | return 0; |
| 4243 | } |
| 4244 | } |
| 4245 | |
| 4246 | /* Append (SYM,BLOCK,SYMTAB) to the end of the array of struct ada_symbol_info |
| 4247 | records in OBSTACKP. Do nothing if SYM is a duplicate. */ |
| 4248 | |
| 4249 | static void |
| 4250 | add_defn_to_vec (struct obstack *obstackp, |
| 4251 | struct symbol *sym, |
| 4252 | struct block *block) |
| 4253 | { |
| 4254 | int i; |
| 4255 | struct ada_symbol_info *prevDefns = defns_collected (obstackp, 0); |
| 4256 | |
| 4257 | /* Do not try to complete stub types, as the debugger is probably |
| 4258 | already scanning all symbols matching a certain name at the |
| 4259 | time when this function is called. Trying to replace the stub |
| 4260 | type by its associated full type will cause us to restart a scan |
| 4261 | which may lead to an infinite recursion. Instead, the client |
| 4262 | collecting the matching symbols will end up collecting several |
| 4263 | matches, with at least one of them complete. It can then filter |
| 4264 | out the stub ones if needed. */ |
| 4265 | |
| 4266 | for (i = num_defns_collected (obstackp) - 1; i >= 0; i -= 1) |
| 4267 | { |
| 4268 | if (lesseq_defined_than (sym, prevDefns[i].sym)) |
| 4269 | return; |
| 4270 | else if (lesseq_defined_than (prevDefns[i].sym, sym)) |
| 4271 | { |
| 4272 | prevDefns[i].sym = sym; |
| 4273 | prevDefns[i].block = block; |
| 4274 | return; |
| 4275 | } |
| 4276 | } |
| 4277 | |
| 4278 | { |
| 4279 | struct ada_symbol_info info; |
| 4280 | |
| 4281 | info.sym = sym; |
| 4282 | info.block = block; |
| 4283 | obstack_grow (obstackp, &info, sizeof (struct ada_symbol_info)); |
| 4284 | } |
| 4285 | } |
| 4286 | |
| 4287 | /* Number of ada_symbol_info structures currently collected in |
| 4288 | current vector in *OBSTACKP. */ |
| 4289 | |
| 4290 | static int |
| 4291 | num_defns_collected (struct obstack *obstackp) |
| 4292 | { |
| 4293 | return obstack_object_size (obstackp) / sizeof (struct ada_symbol_info); |
| 4294 | } |
| 4295 | |
| 4296 | /* Vector of ada_symbol_info structures currently collected in current |
| 4297 | vector in *OBSTACKP. If FINISH, close off the vector and return |
| 4298 | its final address. */ |
| 4299 | |
| 4300 | static struct ada_symbol_info * |
| 4301 | defns_collected (struct obstack *obstackp, int finish) |
| 4302 | { |
| 4303 | if (finish) |
| 4304 | return obstack_finish (obstackp); |
| 4305 | else |
| 4306 | return (struct ada_symbol_info *) obstack_base (obstackp); |
| 4307 | } |
| 4308 | |
| 4309 | /* Return a minimal symbol matching NAME according to Ada decoding |
| 4310 | rules. Returns NULL if there is no such minimal symbol. Names |
| 4311 | prefixed with "standard__" are handled specially: "standard__" is |
| 4312 | first stripped off, and only static and global symbols are searched. */ |
| 4313 | |
| 4314 | struct minimal_symbol * |
| 4315 | ada_lookup_simple_minsym (const char *name) |
| 4316 | { |
| 4317 | struct objfile *objfile; |
| 4318 | struct minimal_symbol *msymbol; |
| 4319 | int wild_match; |
| 4320 | |
| 4321 | if (strncmp (name, "standard__", sizeof ("standard__") - 1) == 0) |
| 4322 | { |
| 4323 | name += sizeof ("standard__") - 1; |
| 4324 | wild_match = 0; |
| 4325 | } |
| 4326 | else |
| 4327 | wild_match = (strstr (name, "__") == NULL); |
| 4328 | |
| 4329 | ALL_MSYMBOLS (objfile, msymbol) |
| 4330 | { |
| 4331 | if (match_name (SYMBOL_LINKAGE_NAME (msymbol), name, wild_match) |
| 4332 | && MSYMBOL_TYPE (msymbol) != mst_solib_trampoline) |
| 4333 | return msymbol; |
| 4334 | } |
| 4335 | |
| 4336 | return NULL; |
| 4337 | } |
| 4338 | |
| 4339 | /* For all subprograms that statically enclose the subprogram of the |
| 4340 | selected frame, add symbols matching identifier NAME in DOMAIN |
| 4341 | and their blocks to the list of data in OBSTACKP, as for |
| 4342 | ada_add_block_symbols (q.v.). If WILD, treat as NAME with a |
| 4343 | wildcard prefix. */ |
| 4344 | |
| 4345 | static void |
| 4346 | add_symbols_from_enclosing_procs (struct obstack *obstackp, |
| 4347 | const char *name, domain_enum namespace, |
| 4348 | int wild_match) |
| 4349 | { |
| 4350 | } |
| 4351 | |
| 4352 | /* True if TYPE is definitely an artificial type supplied to a symbol |
| 4353 | for which no debugging information was given in the symbol file. */ |
| 4354 | |
| 4355 | static int |
| 4356 | is_nondebugging_type (struct type *type) |
| 4357 | { |
| 4358 | char *name = ada_type_name (type); |
| 4359 | |
| 4360 | return (name != NULL && strcmp (name, "<variable, no debug info>") == 0); |
| 4361 | } |
| 4362 | |
| 4363 | /* Remove any non-debugging symbols in SYMS[0 .. NSYMS-1] that definitely |
| 4364 | duplicate other symbols in the list (The only case I know of where |
| 4365 | this happens is when object files containing stabs-in-ecoff are |
| 4366 | linked with files containing ordinary ecoff debugging symbols (or no |
| 4367 | debugging symbols)). Modifies SYMS to squeeze out deleted entries. |
| 4368 | Returns the number of items in the modified list. */ |
| 4369 | |
| 4370 | static int |
| 4371 | remove_extra_symbols (struct ada_symbol_info *syms, int nsyms) |
| 4372 | { |
| 4373 | int i, j; |
| 4374 | |
| 4375 | i = 0; |
| 4376 | while (i < nsyms) |
| 4377 | { |
| 4378 | int remove = 0; |
| 4379 | |
| 4380 | /* If two symbols have the same name and one of them is a stub type, |
| 4381 | the get rid of the stub. */ |
| 4382 | |
| 4383 | if (TYPE_STUB (SYMBOL_TYPE (syms[i].sym)) |
| 4384 | && SYMBOL_LINKAGE_NAME (syms[i].sym) != NULL) |
| 4385 | { |
| 4386 | for (j = 0; j < nsyms; j++) |
| 4387 | { |
| 4388 | if (j != i |
| 4389 | && !TYPE_STUB (SYMBOL_TYPE (syms[j].sym)) |
| 4390 | && SYMBOL_LINKAGE_NAME (syms[j].sym) != NULL |
| 4391 | && strcmp (SYMBOL_LINKAGE_NAME (syms[i].sym), |
| 4392 | SYMBOL_LINKAGE_NAME (syms[j].sym)) == 0) |
| 4393 | remove = 1; |
| 4394 | } |
| 4395 | } |
| 4396 | |
| 4397 | /* Two symbols with the same name, same class and same address |
| 4398 | should be identical. */ |
| 4399 | |
| 4400 | else if (SYMBOL_LINKAGE_NAME (syms[i].sym) != NULL |
| 4401 | && SYMBOL_CLASS (syms[i].sym) == LOC_STATIC |
| 4402 | && is_nondebugging_type (SYMBOL_TYPE (syms[i].sym))) |
| 4403 | { |
| 4404 | for (j = 0; j < nsyms; j += 1) |
| 4405 | { |
| 4406 | if (i != j |
| 4407 | && SYMBOL_LINKAGE_NAME (syms[j].sym) != NULL |
| 4408 | && strcmp (SYMBOL_LINKAGE_NAME (syms[i].sym), |
| 4409 | SYMBOL_LINKAGE_NAME (syms[j].sym)) == 0 |
| 4410 | && SYMBOL_CLASS (syms[i].sym) == SYMBOL_CLASS (syms[j].sym) |
| 4411 | && SYMBOL_VALUE_ADDRESS (syms[i].sym) |
| 4412 | == SYMBOL_VALUE_ADDRESS (syms[j].sym)) |
| 4413 | remove = 1; |
| 4414 | } |
| 4415 | } |
| 4416 | |
| 4417 | if (remove) |
| 4418 | { |
| 4419 | for (j = i + 1; j < nsyms; j += 1) |
| 4420 | syms[j - 1] = syms[j]; |
| 4421 | nsyms -= 1; |
| 4422 | } |
| 4423 | |
| 4424 | i += 1; |
| 4425 | } |
| 4426 | return nsyms; |
| 4427 | } |
| 4428 | |
| 4429 | /* Given a type that corresponds to a renaming entity, use the type name |
| 4430 | to extract the scope (package name or function name, fully qualified, |
| 4431 | and following the GNAT encoding convention) where this renaming has been |
| 4432 | defined. The string returned needs to be deallocated after use. */ |
| 4433 | |
| 4434 | static char * |
| 4435 | xget_renaming_scope (struct type *renaming_type) |
| 4436 | { |
| 4437 | /* The renaming types adhere to the following convention: |
| 4438 | <scope>__<rename>___<XR extension>. |
| 4439 | So, to extract the scope, we search for the "___XR" extension, |
| 4440 | and then backtrack until we find the first "__". */ |
| 4441 | |
| 4442 | const char *name = type_name_no_tag (renaming_type); |
| 4443 | char *suffix = strstr (name, "___XR"); |
| 4444 | char *last; |
| 4445 | int scope_len; |
| 4446 | char *scope; |
| 4447 | |
| 4448 | /* Now, backtrack a bit until we find the first "__". Start looking |
| 4449 | at suffix - 3, as the <rename> part is at least one character long. */ |
| 4450 | |
| 4451 | for (last = suffix - 3; last > name; last--) |
| 4452 | if (last[0] == '_' && last[1] == '_') |
| 4453 | break; |
| 4454 | |
| 4455 | /* Make a copy of scope and return it. */ |
| 4456 | |
| 4457 | scope_len = last - name; |
| 4458 | scope = (char *) xmalloc ((scope_len + 1) * sizeof (char)); |
| 4459 | |
| 4460 | strncpy (scope, name, scope_len); |
| 4461 | scope[scope_len] = '\0'; |
| 4462 | |
| 4463 | return scope; |
| 4464 | } |
| 4465 | |
| 4466 | /* Return nonzero if NAME corresponds to a package name. */ |
| 4467 | |
| 4468 | static int |
| 4469 | is_package_name (const char *name) |
| 4470 | { |
| 4471 | /* Here, We take advantage of the fact that no symbols are generated |
| 4472 | for packages, while symbols are generated for each function. |
| 4473 | So the condition for NAME represent a package becomes equivalent |
| 4474 | to NAME not existing in our list of symbols. There is only one |
| 4475 | small complication with library-level functions (see below). */ |
| 4476 | |
| 4477 | char *fun_name; |
| 4478 | |
| 4479 | /* If it is a function that has not been defined at library level, |
| 4480 | then we should be able to look it up in the symbols. */ |
| 4481 | if (standard_lookup (name, NULL, VAR_DOMAIN) != NULL) |
| 4482 | return 0; |
| 4483 | |
| 4484 | /* Library-level function names start with "_ada_". See if function |
| 4485 | "_ada_" followed by NAME can be found. */ |
| 4486 | |
| 4487 | /* Do a quick check that NAME does not contain "__", since library-level |
| 4488 | functions names cannot contain "__" in them. */ |
| 4489 | if (strstr (name, "__") != NULL) |
| 4490 | return 0; |
| 4491 | |
| 4492 | fun_name = xstrprintf ("_ada_%s", name); |
| 4493 | |
| 4494 | return (standard_lookup (fun_name, NULL, VAR_DOMAIN) == NULL); |
| 4495 | } |
| 4496 | |
| 4497 | /* Return nonzero if SYM corresponds to a renaming entity that is |
| 4498 | not visible from FUNCTION_NAME. */ |
| 4499 | |
| 4500 | static int |
| 4501 | old_renaming_is_invisible (const struct symbol *sym, char *function_name) |
| 4502 | { |
| 4503 | char *scope; |
| 4504 | |
| 4505 | if (SYMBOL_CLASS (sym) != LOC_TYPEDEF) |
| 4506 | return 0; |
| 4507 | |
| 4508 | scope = xget_renaming_scope (SYMBOL_TYPE (sym)); |
| 4509 | |
| 4510 | make_cleanup (xfree, scope); |
| 4511 | |
| 4512 | /* If the rename has been defined in a package, then it is visible. */ |
| 4513 | if (is_package_name (scope)) |
| 4514 | return 0; |
| 4515 | |
| 4516 | /* Check that the rename is in the current function scope by checking |
| 4517 | that its name starts with SCOPE. */ |
| 4518 | |
| 4519 | /* If the function name starts with "_ada_", it means that it is |
| 4520 | a library-level function. Strip this prefix before doing the |
| 4521 | comparison, as the encoding for the renaming does not contain |
| 4522 | this prefix. */ |
| 4523 | if (strncmp (function_name, "_ada_", 5) == 0) |
| 4524 | function_name += 5; |
| 4525 | |
| 4526 | return (strncmp (function_name, scope, strlen (scope)) != 0); |
| 4527 | } |
| 4528 | |
| 4529 | /* Remove entries from SYMS that corresponds to a renaming entity that |
| 4530 | is not visible from the function associated with CURRENT_BLOCK or |
| 4531 | that is superfluous due to the presence of more specific renaming |
| 4532 | information. Places surviving symbols in the initial entries of |
| 4533 | SYMS and returns the number of surviving symbols. |
| 4534 | |
| 4535 | Rationale: |
| 4536 | First, in cases where an object renaming is implemented as a |
| 4537 | reference variable, GNAT may produce both the actual reference |
| 4538 | variable and the renaming encoding. In this case, we discard the |
| 4539 | latter. |
| 4540 | |
| 4541 | Second, GNAT emits a type following a specified encoding for each renaming |
| 4542 | entity. Unfortunately, STABS currently does not support the definition |
| 4543 | of types that are local to a given lexical block, so all renamings types |
| 4544 | are emitted at library level. As a consequence, if an application |
| 4545 | contains two renaming entities using the same name, and a user tries to |
| 4546 | print the value of one of these entities, the result of the ada symbol |
| 4547 | lookup will also contain the wrong renaming type. |
| 4548 | |
| 4549 | This function partially covers for this limitation by attempting to |
| 4550 | remove from the SYMS list renaming symbols that should be visible |
| 4551 | from CURRENT_BLOCK. However, there does not seem be a 100% reliable |
| 4552 | method with the current information available. The implementation |
| 4553 | below has a couple of limitations (FIXME: brobecker-2003-05-12): |
| 4554 | |
| 4555 | - When the user tries to print a rename in a function while there |
| 4556 | is another rename entity defined in a package: Normally, the |
| 4557 | rename in the function has precedence over the rename in the |
| 4558 | package, so the latter should be removed from the list. This is |
| 4559 | currently not the case. |
| 4560 | |
| 4561 | - This function will incorrectly remove valid renames if |
| 4562 | the CURRENT_BLOCK corresponds to a function which symbol name |
| 4563 | has been changed by an "Export" pragma. As a consequence, |
| 4564 | the user will be unable to print such rename entities. */ |
| 4565 | |
| 4566 | static int |
| 4567 | remove_irrelevant_renamings (struct ada_symbol_info *syms, |
| 4568 | int nsyms, const struct block *current_block) |
| 4569 | { |
| 4570 | struct symbol *current_function; |
| 4571 | char *current_function_name; |
| 4572 | int i; |
| 4573 | int is_new_style_renaming; |
| 4574 | |
| 4575 | /* If there is both a renaming foo___XR... encoded as a variable and |
| 4576 | a simple variable foo in the same block, discard the latter. |
| 4577 | First, zero out such symbols, then compress. */ |
| 4578 | is_new_style_renaming = 0; |
| 4579 | for (i = 0; i < nsyms; i += 1) |
| 4580 | { |
| 4581 | struct symbol *sym = syms[i].sym; |
| 4582 | struct block *block = syms[i].block; |
| 4583 | const char *name; |
| 4584 | const char *suffix; |
| 4585 | |
| 4586 | if (sym == NULL || SYMBOL_CLASS (sym) == LOC_TYPEDEF) |
| 4587 | continue; |
| 4588 | name = SYMBOL_LINKAGE_NAME (sym); |
| 4589 | suffix = strstr (name, "___XR"); |
| 4590 | |
| 4591 | if (suffix != NULL) |
| 4592 | { |
| 4593 | int name_len = suffix - name; |
| 4594 | int j; |
| 4595 | |
| 4596 | is_new_style_renaming = 1; |
| 4597 | for (j = 0; j < nsyms; j += 1) |
| 4598 | if (i != j && syms[j].sym != NULL |
| 4599 | && strncmp (name, SYMBOL_LINKAGE_NAME (syms[j].sym), |
| 4600 | name_len) == 0 |
| 4601 | && block == syms[j].block) |
| 4602 | syms[j].sym = NULL; |
| 4603 | } |
| 4604 | } |
| 4605 | if (is_new_style_renaming) |
| 4606 | { |
| 4607 | int j, k; |
| 4608 | |
| 4609 | for (j = k = 0; j < nsyms; j += 1) |
| 4610 | if (syms[j].sym != NULL) |
| 4611 | { |
| 4612 | syms[k] = syms[j]; |
| 4613 | k += 1; |
| 4614 | } |
| 4615 | return k; |
| 4616 | } |
| 4617 | |
| 4618 | /* Extract the function name associated to CURRENT_BLOCK. |
| 4619 | Abort if unable to do so. */ |
| 4620 | |
| 4621 | if (current_block == NULL) |
| 4622 | return nsyms; |
| 4623 | |
| 4624 | current_function = block_linkage_function (current_block); |
| 4625 | if (current_function == NULL) |
| 4626 | return nsyms; |
| 4627 | |
| 4628 | current_function_name = SYMBOL_LINKAGE_NAME (current_function); |
| 4629 | if (current_function_name == NULL) |
| 4630 | return nsyms; |
| 4631 | |
| 4632 | /* Check each of the symbols, and remove it from the list if it is |
| 4633 | a type corresponding to a renaming that is out of the scope of |
| 4634 | the current block. */ |
| 4635 | |
| 4636 | i = 0; |
| 4637 | while (i < nsyms) |
| 4638 | { |
| 4639 | if (ada_parse_renaming (syms[i].sym, NULL, NULL, NULL) |
| 4640 | == ADA_OBJECT_RENAMING |
| 4641 | && old_renaming_is_invisible (syms[i].sym, current_function_name)) |
| 4642 | { |
| 4643 | int j; |
| 4644 | |
| 4645 | for (j = i + 1; j < nsyms; j += 1) |
| 4646 | syms[j - 1] = syms[j]; |
| 4647 | nsyms -= 1; |
| 4648 | } |
| 4649 | else |
| 4650 | i += 1; |
| 4651 | } |
| 4652 | |
| 4653 | return nsyms; |
| 4654 | } |
| 4655 | |
| 4656 | /* Add to OBSTACKP all symbols from BLOCK (and its super-blocks) |
| 4657 | whose name and domain match NAME and DOMAIN respectively. |
| 4658 | If no match was found, then extend the search to "enclosing" |
| 4659 | routines (in other words, if we're inside a nested function, |
| 4660 | search the symbols defined inside the enclosing functions). |
| 4661 | |
| 4662 | Note: This function assumes that OBSTACKP has 0 (zero) element in it. */ |
| 4663 | |
| 4664 | static void |
| 4665 | ada_add_local_symbols (struct obstack *obstackp, const char *name, |
| 4666 | struct block *block, domain_enum domain, |
| 4667 | int wild_match) |
| 4668 | { |
| 4669 | int block_depth = 0; |
| 4670 | |
| 4671 | while (block != NULL) |
| 4672 | { |
| 4673 | block_depth += 1; |
| 4674 | ada_add_block_symbols (obstackp, block, name, domain, NULL, wild_match); |
| 4675 | |
| 4676 | /* If we found a non-function match, assume that's the one. */ |
| 4677 | if (is_nonfunction (defns_collected (obstackp, 0), |
| 4678 | num_defns_collected (obstackp))) |
| 4679 | return; |
| 4680 | |
| 4681 | block = BLOCK_SUPERBLOCK (block); |
| 4682 | } |
| 4683 | |
| 4684 | /* If no luck so far, try to find NAME as a local symbol in some lexically |
| 4685 | enclosing subprogram. */ |
| 4686 | if (num_defns_collected (obstackp) == 0 && block_depth > 2) |
| 4687 | add_symbols_from_enclosing_procs (obstackp, name, domain, wild_match); |
| 4688 | } |
| 4689 | |
| 4690 | /* An object of this type is used as the user_data argument when |
| 4691 | calling the map_matching_symbols method. */ |
| 4692 | |
| 4693 | struct match_data |
| 4694 | { |
| 4695 | struct objfile *objfile; |
| 4696 | struct obstack *obstackp; |
| 4697 | struct symbol *arg_sym; |
| 4698 | int found_sym; |
| 4699 | }; |
| 4700 | |
| 4701 | /* A callback for add_matching_symbols that adds SYM, found in BLOCK, |
| 4702 | to a list of symbols. DATA0 is a pointer to a struct match_data * |
| 4703 | containing the obstack that collects the symbol list, the file that SYM |
| 4704 | must come from, a flag indicating whether a non-argument symbol has |
| 4705 | been found in the current block, and the last argument symbol |
| 4706 | passed in SYM within the current block (if any). When SYM is null, |
| 4707 | marking the end of a block, the argument symbol is added if no |
| 4708 | other has been found. */ |
| 4709 | |
| 4710 | static int |
| 4711 | aux_add_nonlocal_symbols (struct block *block, struct symbol *sym, void *data0) |
| 4712 | { |
| 4713 | struct match_data *data = (struct match_data *) data0; |
| 4714 | |
| 4715 | if (sym == NULL) |
| 4716 | { |
| 4717 | if (!data->found_sym && data->arg_sym != NULL) |
| 4718 | add_defn_to_vec (data->obstackp, |
| 4719 | fixup_symbol_section (data->arg_sym, data->objfile), |
| 4720 | block); |
| 4721 | data->found_sym = 0; |
| 4722 | data->arg_sym = NULL; |
| 4723 | } |
| 4724 | else |
| 4725 | { |
| 4726 | if (SYMBOL_CLASS (sym) == LOC_UNRESOLVED) |
| 4727 | return 0; |
| 4728 | else if (SYMBOL_IS_ARGUMENT (sym)) |
| 4729 | data->arg_sym = sym; |
| 4730 | else |
| 4731 | { |
| 4732 | data->found_sym = 1; |
| 4733 | add_defn_to_vec (data->obstackp, |
| 4734 | fixup_symbol_section (sym, data->objfile), |
| 4735 | block); |
| 4736 | } |
| 4737 | } |
| 4738 | return 0; |
| 4739 | } |
| 4740 | |
| 4741 | /* Compare STRING1 to STRING2, with results as for strcmp. |
| 4742 | Compatible with strcmp_iw in that strcmp_iw (STRING1, STRING2) <= 0 |
| 4743 | implies compare_names (STRING1, STRING2) (they may differ as to |
| 4744 | what symbols compare equal). */ |
| 4745 | |
| 4746 | static int |
| 4747 | compare_names (const char *string1, const char *string2) |
| 4748 | { |
| 4749 | while (*string1 != '\0' && *string2 != '\0') |
| 4750 | { |
| 4751 | if (isspace (*string1) || isspace (*string2)) |
| 4752 | return strcmp_iw_ordered (string1, string2); |
| 4753 | if (*string1 != *string2) |
| 4754 | break; |
| 4755 | string1 += 1; |
| 4756 | string2 += 1; |
| 4757 | } |
| 4758 | switch (*string1) |
| 4759 | { |
| 4760 | case '(': |
| 4761 | return strcmp_iw_ordered (string1, string2); |
| 4762 | case '_': |
| 4763 | if (*string2 == '\0') |
| 4764 | { |
| 4765 | if (is_name_suffix (string1)) |
| 4766 | return 0; |
| 4767 | else |
| 4768 | return -1; |
| 4769 | } |
| 4770 | /* FALLTHROUGH */ |
| 4771 | default: |
| 4772 | if (*string2 == '(') |
| 4773 | return strcmp_iw_ordered (string1, string2); |
| 4774 | else |
| 4775 | return *string1 - *string2; |
| 4776 | } |
| 4777 | } |
| 4778 | |
| 4779 | /* Add to OBSTACKP all non-local symbols whose name and domain match |
| 4780 | NAME and DOMAIN respectively. The search is performed on GLOBAL_BLOCK |
| 4781 | symbols if GLOBAL is non-zero, or on STATIC_BLOCK symbols otherwise. */ |
| 4782 | |
| 4783 | static void |
| 4784 | add_nonlocal_symbols (struct obstack *obstackp, const char *name, |
| 4785 | domain_enum domain, int global, |
| 4786 | int is_wild_match) |
| 4787 | { |
| 4788 | struct objfile *objfile; |
| 4789 | struct match_data data; |
| 4790 | |
| 4791 | data.obstackp = obstackp; |
| 4792 | data.arg_sym = NULL; |
| 4793 | |
| 4794 | ALL_OBJFILES (objfile) |
| 4795 | { |
| 4796 | data.objfile = objfile; |
| 4797 | |
| 4798 | if (is_wild_match) |
| 4799 | objfile->sf->qf->map_matching_symbols (name, domain, objfile, global, |
| 4800 | aux_add_nonlocal_symbols, &data, |
| 4801 | wild_match, NULL); |
| 4802 | else |
| 4803 | objfile->sf->qf->map_matching_symbols (name, domain, objfile, global, |
| 4804 | aux_add_nonlocal_symbols, &data, |
| 4805 | full_match, compare_names); |
| 4806 | } |
| 4807 | |
| 4808 | if (num_defns_collected (obstackp) == 0 && global && !is_wild_match) |
| 4809 | { |
| 4810 | ALL_OBJFILES (objfile) |
| 4811 | { |
| 4812 | char *name1 = alloca (strlen (name) + sizeof ("_ada_")); |
| 4813 | strcpy (name1, "_ada_"); |
| 4814 | strcpy (name1 + sizeof ("_ada_") - 1, name); |
| 4815 | data.objfile = objfile; |
| 4816 | objfile->sf->qf->map_matching_symbols (name1, domain, |
| 4817 | objfile, global, |
| 4818 | aux_add_nonlocal_symbols, |
| 4819 | &data, |
| 4820 | full_match, compare_names); |
| 4821 | } |
| 4822 | } |
| 4823 | } |
| 4824 | |
| 4825 | /* Find symbols in DOMAIN matching NAME0, in BLOCK0 and enclosing |
| 4826 | scope and in global scopes, returning the number of matches. Sets |
| 4827 | *RESULTS to point to a vector of (SYM,BLOCK) tuples, |
| 4828 | indicating the symbols found and the blocks and symbol tables (if |
| 4829 | any) in which they were found. This vector are transient---good only to |
| 4830 | the next call of ada_lookup_symbol_list. Any non-function/non-enumeral |
| 4831 | symbol match within the nest of blocks whose innermost member is BLOCK0, |
| 4832 | is the one match returned (no other matches in that or |
| 4833 | enclosing blocks is returned). If there are any matches in or |
| 4834 | surrounding BLOCK0, then these alone are returned. Otherwise, the |
| 4835 | search extends to global and file-scope (static) symbol tables. |
| 4836 | Names prefixed with "standard__" are handled specially: "standard__" |
| 4837 | is first stripped off, and only static and global symbols are searched. */ |
| 4838 | |
| 4839 | int |
| 4840 | ada_lookup_symbol_list (const char *name0, const struct block *block0, |
| 4841 | domain_enum namespace, |
| 4842 | struct ada_symbol_info **results) |
| 4843 | { |
| 4844 | struct symbol *sym; |
| 4845 | struct block *block; |
| 4846 | const char *name; |
| 4847 | int wild_match; |
| 4848 | int cacheIfUnique; |
| 4849 | int ndefns; |
| 4850 | |
| 4851 | obstack_free (&symbol_list_obstack, NULL); |
| 4852 | obstack_init (&symbol_list_obstack); |
| 4853 | |
| 4854 | cacheIfUnique = 0; |
| 4855 | |
| 4856 | /* Search specified block and its superiors. */ |
| 4857 | |
| 4858 | wild_match = (strstr (name0, "__") == NULL); |
| 4859 | name = name0; |
| 4860 | block = (struct block *) block0; /* FIXME: No cast ought to be |
| 4861 | needed, but adding const will |
| 4862 | have a cascade effect. */ |
| 4863 | |
| 4864 | /* Special case: If the user specifies a symbol name inside package |
| 4865 | Standard, do a non-wild matching of the symbol name without |
| 4866 | the "standard__" prefix. This was primarily introduced in order |
| 4867 | to allow the user to specifically access the standard exceptions |
| 4868 | using, for instance, Standard.Constraint_Error when Constraint_Error |
| 4869 | is ambiguous (due to the user defining its own Constraint_Error |
| 4870 | entity inside its program). */ |
| 4871 | if (strncmp (name0, "standard__", sizeof ("standard__") - 1) == 0) |
| 4872 | { |
| 4873 | wild_match = 0; |
| 4874 | block = NULL; |
| 4875 | name = name0 + sizeof ("standard__") - 1; |
| 4876 | } |
| 4877 | |
| 4878 | /* Check the non-global symbols. If we have ANY match, then we're done. */ |
| 4879 | |
| 4880 | ada_add_local_symbols (&symbol_list_obstack, name, block, namespace, |
| 4881 | wild_match); |
| 4882 | if (num_defns_collected (&symbol_list_obstack) > 0) |
| 4883 | goto done; |
| 4884 | |
| 4885 | /* No non-global symbols found. Check our cache to see if we have |
| 4886 | already performed this search before. If we have, then return |
| 4887 | the same result. */ |
| 4888 | |
| 4889 | cacheIfUnique = 1; |
| 4890 | if (lookup_cached_symbol (name0, namespace, &sym, &block)) |
| 4891 | { |
| 4892 | if (sym != NULL) |
| 4893 | add_defn_to_vec (&symbol_list_obstack, sym, block); |
| 4894 | goto done; |
| 4895 | } |
| 4896 | |
| 4897 | /* Search symbols from all global blocks. */ |
| 4898 | |
| 4899 | add_nonlocal_symbols (&symbol_list_obstack, name, namespace, 1, |
| 4900 | wild_match); |
| 4901 | |
| 4902 | /* Now add symbols from all per-file blocks if we've gotten no hits |
| 4903 | (not strictly correct, but perhaps better than an error). */ |
| 4904 | |
| 4905 | if (num_defns_collected (&symbol_list_obstack) == 0) |
| 4906 | add_nonlocal_symbols (&symbol_list_obstack, name, namespace, 0, |
| 4907 | wild_match); |
| 4908 | |
| 4909 | done: |
| 4910 | ndefns = num_defns_collected (&symbol_list_obstack); |
| 4911 | *results = defns_collected (&symbol_list_obstack, 1); |
| 4912 | |
| 4913 | ndefns = remove_extra_symbols (*results, ndefns); |
| 4914 | |
| 4915 | if (ndefns == 0) |
| 4916 | cache_symbol (name0, namespace, NULL, NULL); |
| 4917 | |
| 4918 | if (ndefns == 1 && cacheIfUnique) |
| 4919 | cache_symbol (name0, namespace, (*results)[0].sym, (*results)[0].block); |
| 4920 | |
| 4921 | ndefns = remove_irrelevant_renamings (*results, ndefns, block0); |
| 4922 | |
| 4923 | return ndefns; |
| 4924 | } |
| 4925 | |
| 4926 | struct symbol * |
| 4927 | ada_lookup_encoded_symbol (const char *name, const struct block *block0, |
| 4928 | domain_enum namespace, struct block **block_found) |
| 4929 | { |
| 4930 | struct ada_symbol_info *candidates; |
| 4931 | int n_candidates; |
| 4932 | |
| 4933 | n_candidates = ada_lookup_symbol_list (name, block0, namespace, &candidates); |
| 4934 | |
| 4935 | if (n_candidates == 0) |
| 4936 | return NULL; |
| 4937 | |
| 4938 | if (block_found != NULL) |
| 4939 | *block_found = candidates[0].block; |
| 4940 | |
| 4941 | return fixup_symbol_section (candidates[0].sym, NULL); |
| 4942 | } |
| 4943 | |
| 4944 | /* Return a symbol in DOMAIN matching NAME, in BLOCK0 and enclosing |
| 4945 | scope and in global scopes, or NULL if none. NAME is folded and |
| 4946 | encoded first. Otherwise, the result is as for ada_lookup_symbol_list, |
| 4947 | choosing the first symbol if there are multiple choices. |
| 4948 | *IS_A_FIELD_OF_THIS is set to 0 and *SYMTAB is set to the symbol |
| 4949 | table in which the symbol was found (in both cases, these |
| 4950 | assignments occur only if the pointers are non-null). */ |
| 4951 | struct symbol * |
| 4952 | ada_lookup_symbol (const char *name, const struct block *block0, |
| 4953 | domain_enum namespace, int *is_a_field_of_this) |
| 4954 | { |
| 4955 | if (is_a_field_of_this != NULL) |
| 4956 | *is_a_field_of_this = 0; |
| 4957 | |
| 4958 | return |
| 4959 | ada_lookup_encoded_symbol (ada_encode (ada_fold_name (name)), |
| 4960 | block0, namespace, NULL); |
| 4961 | } |
| 4962 | |
| 4963 | static struct symbol * |
| 4964 | ada_lookup_symbol_nonlocal (const char *name, |
| 4965 | const struct block *block, |
| 4966 | const domain_enum domain) |
| 4967 | { |
| 4968 | return ada_lookup_symbol (name, block_static_block (block), domain, NULL); |
| 4969 | } |
| 4970 | |
| 4971 | |
| 4972 | /* True iff STR is a possible encoded suffix of a normal Ada name |
| 4973 | that is to be ignored for matching purposes. Suffixes of parallel |
| 4974 | names (e.g., XVE) are not included here. Currently, the possible suffixes |
| 4975 | are given by any of the regular expressions: |
| 4976 | |
| 4977 | [.$][0-9]+ [nested subprogram suffix, on platforms such as GNU/Linux] |
| 4978 | ___[0-9]+ [nested subprogram suffix, on platforms such as HP/UX] |
| 4979 | _E[0-9]+[bs]$ [protected object entry suffixes] |
| 4980 | (X[nb]*)?((\$|__)[0-9](_?[0-9]+)|___(JM|LJM|X([FDBUP].*|R[^T]?)))?$ |
| 4981 | |
| 4982 | Also, any leading "__[0-9]+" sequence is skipped before the suffix |
| 4983 | match is performed. This sequence is used to differentiate homonyms, |
| 4984 | is an optional part of a valid name suffix. */ |
| 4985 | |
| 4986 | static int |
| 4987 | is_name_suffix (const char *str) |
| 4988 | { |
| 4989 | int k; |
| 4990 | const char *matching; |
| 4991 | const int len = strlen (str); |
| 4992 | |
| 4993 | /* Skip optional leading __[0-9]+. */ |
| 4994 | |
| 4995 | if (len > 3 && str[0] == '_' && str[1] == '_' && isdigit (str[2])) |
| 4996 | { |
| 4997 | str += 3; |
| 4998 | while (isdigit (str[0])) |
| 4999 | str += 1; |
| 5000 | } |
| 5001 | |
| 5002 | /* [.$][0-9]+ */ |
| 5003 | |
| 5004 | if (str[0] == '.' || str[0] == '$') |
| 5005 | { |
| 5006 | matching = str + 1; |
| 5007 | while (isdigit (matching[0])) |
| 5008 | matching += 1; |
| 5009 | if (matching[0] == '\0') |
| 5010 | return 1; |
| 5011 | } |
| 5012 | |
| 5013 | /* ___[0-9]+ */ |
| 5014 | |
| 5015 | if (len > 3 && str[0] == '_' && str[1] == '_' && str[2] == '_') |
| 5016 | { |
| 5017 | matching = str + 3; |
| 5018 | while (isdigit (matching[0])) |
| 5019 | matching += 1; |
| 5020 | if (matching[0] == '\0') |
| 5021 | return 1; |
| 5022 | } |
| 5023 | |
| 5024 | #if 0 |
| 5025 | /* FIXME: brobecker/2005-09-23: Protected Object subprograms end |
| 5026 | with a N at the end. Unfortunately, the compiler uses the same |
| 5027 | convention for other internal types it creates. So treating |
| 5028 | all entity names that end with an "N" as a name suffix causes |
| 5029 | some regressions. For instance, consider the case of an enumerated |
| 5030 | type. To support the 'Image attribute, it creates an array whose |
| 5031 | name ends with N. |
| 5032 | Having a single character like this as a suffix carrying some |
| 5033 | information is a bit risky. Perhaps we should change the encoding |
| 5034 | to be something like "_N" instead. In the meantime, do not do |
| 5035 | the following check. */ |
| 5036 | /* Protected Object Subprograms */ |
| 5037 | if (len == 1 && str [0] == 'N') |
| 5038 | return 1; |
| 5039 | #endif |
| 5040 | |
| 5041 | /* _E[0-9]+[bs]$ */ |
| 5042 | if (len > 3 && str[0] == '_' && str [1] == 'E' && isdigit (str[2])) |
| 5043 | { |
| 5044 | matching = str + 3; |
| 5045 | while (isdigit (matching[0])) |
| 5046 | matching += 1; |
| 5047 | if ((matching[0] == 'b' || matching[0] == 's') |
| 5048 | && matching [1] == '\0') |
| 5049 | return 1; |
| 5050 | } |
| 5051 | |
| 5052 | /* ??? We should not modify STR directly, as we are doing below. This |
| 5053 | is fine in this case, but may become problematic later if we find |
| 5054 | that this alternative did not work, and want to try matching |
| 5055 | another one from the begining of STR. Since we modified it, we |
| 5056 | won't be able to find the begining of the string anymore! */ |
| 5057 | if (str[0] == 'X') |
| 5058 | { |
| 5059 | str += 1; |
| 5060 | while (str[0] != '_' && str[0] != '\0') |
| 5061 | { |
| 5062 | if (str[0] != 'n' && str[0] != 'b') |
| 5063 | return 0; |
| 5064 | str += 1; |
| 5065 | } |
| 5066 | } |
| 5067 | |
| 5068 | if (str[0] == '\000') |
| 5069 | return 1; |
| 5070 | |
| 5071 | if (str[0] == '_') |
| 5072 | { |
| 5073 | if (str[1] != '_' || str[2] == '\000') |
| 5074 | return 0; |
| 5075 | if (str[2] == '_') |
| 5076 | { |
| 5077 | if (strcmp (str + 3, "JM") == 0) |
| 5078 | return 1; |
| 5079 | /* FIXME: brobecker/2004-09-30: GNAT will soon stop using |
| 5080 | the LJM suffix in favor of the JM one. But we will |
| 5081 | still accept LJM as a valid suffix for a reasonable |
| 5082 | amount of time, just to allow ourselves to debug programs |
| 5083 | compiled using an older version of GNAT. */ |
| 5084 | if (strcmp (str + 3, "LJM") == 0) |
| 5085 | return 1; |
| 5086 | if (str[3] != 'X') |
| 5087 | return 0; |
| 5088 | if (str[4] == 'F' || str[4] == 'D' || str[4] == 'B' |
| 5089 | || str[4] == 'U' || str[4] == 'P') |
| 5090 | return 1; |
| 5091 | if (str[4] == 'R' && str[5] != 'T') |
| 5092 | return 1; |
| 5093 | return 0; |
| 5094 | } |
| 5095 | if (!isdigit (str[2])) |
| 5096 | return 0; |
| 5097 | for (k = 3; str[k] != '\0'; k += 1) |
| 5098 | if (!isdigit (str[k]) && str[k] != '_') |
| 5099 | return 0; |
| 5100 | return 1; |
| 5101 | } |
| 5102 | if (str[0] == '$' && isdigit (str[1])) |
| 5103 | { |
| 5104 | for (k = 2; str[k] != '\0'; k += 1) |
| 5105 | if (!isdigit (str[k]) && str[k] != '_') |
| 5106 | return 0; |
| 5107 | return 1; |
| 5108 | } |
| 5109 | return 0; |
| 5110 | } |
| 5111 | |
| 5112 | /* Return non-zero if the string starting at NAME and ending before |
| 5113 | NAME_END contains no capital letters. */ |
| 5114 | |
| 5115 | static int |
| 5116 | is_valid_name_for_wild_match (const char *name0) |
| 5117 | { |
| 5118 | const char *decoded_name = ada_decode (name0); |
| 5119 | int i; |
| 5120 | |
| 5121 | /* If the decoded name starts with an angle bracket, it means that |
| 5122 | NAME0 does not follow the GNAT encoding format. It should then |
| 5123 | not be allowed as a possible wild match. */ |
| 5124 | if (decoded_name[0] == '<') |
| 5125 | return 0; |
| 5126 | |
| 5127 | for (i=0; decoded_name[i] != '\0'; i++) |
| 5128 | if (isalpha (decoded_name[i]) && !islower (decoded_name[i])) |
| 5129 | return 0; |
| 5130 | |
| 5131 | return 1; |
| 5132 | } |
| 5133 | |
| 5134 | /* Advance *NAMEP to next occurrence of TARGET0 in the string NAME0 |
| 5135 | that could start a simple name. Assumes that *NAMEP points into |
| 5136 | the string beginning at NAME0. */ |
| 5137 | |
| 5138 | static int |
| 5139 | advance_wild_match (const char **namep, const char *name0, int target0) |
| 5140 | { |
| 5141 | const char *name = *namep; |
| 5142 | |
| 5143 | while (1) |
| 5144 | { |
| 5145 | int t0, t1; |
| 5146 | |
| 5147 | t0 = *name; |
| 5148 | if (t0 == '_') |
| 5149 | { |
| 5150 | t1 = name[1]; |
| 5151 | if ((t1 >= 'a' && t1 <= 'z') || (t1 >= '0' && t1 <= '9')) |
| 5152 | { |
| 5153 | name += 1; |
| 5154 | if (name == name0 + 5 && strncmp (name0, "_ada", 4) == 0) |
| 5155 | break; |
| 5156 | else |
| 5157 | name += 1; |
| 5158 | } |
| 5159 | else if (t1 == '_' && ((name[2] >= 'a' && name[2] <= 'z') |
| 5160 | || name[2] == target0)) |
| 5161 | { |
| 5162 | name += 2; |
| 5163 | break; |
| 5164 | } |
| 5165 | else |
| 5166 | return 0; |
| 5167 | } |
| 5168 | else if ((t0 >= 'a' && t0 <= 'z') || (t0 >= '0' && t0 <= '9')) |
| 5169 | name += 1; |
| 5170 | else |
| 5171 | return 0; |
| 5172 | } |
| 5173 | |
| 5174 | *namep = name; |
| 5175 | return 1; |
| 5176 | } |
| 5177 | |
| 5178 | /* Return 0 iff NAME encodes a name of the form prefix.PATN. Ignores any |
| 5179 | informational suffixes of NAME (i.e., for which is_name_suffix is |
| 5180 | true). Assumes that PATN is a lower-cased Ada simple name. */ |
| 5181 | |
| 5182 | static int |
| 5183 | wild_match (const char *name, const char *patn) |
| 5184 | { |
| 5185 | const char *p, *n; |
| 5186 | const char *name0 = name; |
| 5187 | |
| 5188 | while (1) |
| 5189 | { |
| 5190 | const char *match = name; |
| 5191 | |
| 5192 | if (*name == *patn) |
| 5193 | { |
| 5194 | for (name += 1, p = patn + 1; *p != '\0'; name += 1, p += 1) |
| 5195 | if (*p != *name) |
| 5196 | break; |
| 5197 | if (*p == '\0' && is_name_suffix (name)) |
| 5198 | return match != name0 && !is_valid_name_for_wild_match (name0); |
| 5199 | |
| 5200 | if (name[-1] == '_') |
| 5201 | name -= 1; |
| 5202 | } |
| 5203 | if (!advance_wild_match (&name, name0, *patn)) |
| 5204 | return 1; |
| 5205 | } |
| 5206 | } |
| 5207 | |
| 5208 | /* Returns 0 iff symbol name SYM_NAME matches SEARCH_NAME, apart from |
| 5209 | informational suffix. */ |
| 5210 | |
| 5211 | static int |
| 5212 | full_match (const char *sym_name, const char *search_name) |
| 5213 | { |
| 5214 | return !match_name (sym_name, search_name, 0); |
| 5215 | } |
| 5216 | |
| 5217 | |
| 5218 | /* Add symbols from BLOCK matching identifier NAME in DOMAIN to |
| 5219 | vector *defn_symbols, updating the list of symbols in OBSTACKP |
| 5220 | (if necessary). If WILD, treat as NAME with a wildcard prefix. |
| 5221 | OBJFILE is the section containing BLOCK. |
| 5222 | SYMTAB is recorded with each symbol added. */ |
| 5223 | |
| 5224 | static void |
| 5225 | ada_add_block_symbols (struct obstack *obstackp, |
| 5226 | struct block *block, const char *name, |
| 5227 | domain_enum domain, struct objfile *objfile, |
| 5228 | int wild) |
| 5229 | { |
| 5230 | struct dict_iterator iter; |
| 5231 | int name_len = strlen (name); |
| 5232 | /* A matching argument symbol, if any. */ |
| 5233 | struct symbol *arg_sym; |
| 5234 | /* Set true when we find a matching non-argument symbol. */ |
| 5235 | int found_sym; |
| 5236 | struct symbol *sym; |
| 5237 | |
| 5238 | arg_sym = NULL; |
| 5239 | found_sym = 0; |
| 5240 | if (wild) |
| 5241 | { |
| 5242 | for (sym = dict_iter_match_first (BLOCK_DICT (block), name, |
| 5243 | wild_match, &iter); |
| 5244 | sym != NULL; sym = dict_iter_match_next (name, wild_match, &iter)) |
| 5245 | { |
| 5246 | if (symbol_matches_domain (SYMBOL_LANGUAGE (sym), |
| 5247 | SYMBOL_DOMAIN (sym), domain) |
| 5248 | && wild_match (SYMBOL_LINKAGE_NAME (sym), name) == 0) |
| 5249 | { |
| 5250 | if (SYMBOL_CLASS (sym) == LOC_UNRESOLVED) |
| 5251 | continue; |
| 5252 | else if (SYMBOL_IS_ARGUMENT (sym)) |
| 5253 | arg_sym = sym; |
| 5254 | else |
| 5255 | { |
| 5256 | found_sym = 1; |
| 5257 | add_defn_to_vec (obstackp, |
| 5258 | fixup_symbol_section (sym, objfile), |
| 5259 | block); |
| 5260 | } |
| 5261 | } |
| 5262 | } |
| 5263 | } |
| 5264 | else |
| 5265 | { |
| 5266 | for (sym = dict_iter_match_first (BLOCK_DICT (block), name, |
| 5267 | full_match, &iter); |
| 5268 | sym != NULL; sym = dict_iter_match_next (name, full_match, &iter)) |
| 5269 | { |
| 5270 | if (symbol_matches_domain (SYMBOL_LANGUAGE (sym), |
| 5271 | SYMBOL_DOMAIN (sym), domain)) |
| 5272 | { |
| 5273 | if (SYMBOL_CLASS (sym) != LOC_UNRESOLVED) |
| 5274 | { |
| 5275 | if (SYMBOL_IS_ARGUMENT (sym)) |
| 5276 | arg_sym = sym; |
| 5277 | else |
| 5278 | { |
| 5279 | found_sym = 1; |
| 5280 | add_defn_to_vec (obstackp, |
| 5281 | fixup_symbol_section (sym, objfile), |
| 5282 | block); |
| 5283 | } |
| 5284 | } |
| 5285 | } |
| 5286 | } |
| 5287 | } |
| 5288 | |
| 5289 | if (!found_sym && arg_sym != NULL) |
| 5290 | { |
| 5291 | add_defn_to_vec (obstackp, |
| 5292 | fixup_symbol_section (arg_sym, objfile), |
| 5293 | block); |
| 5294 | } |
| 5295 | |
| 5296 | if (!wild) |
| 5297 | { |
| 5298 | arg_sym = NULL; |
| 5299 | found_sym = 0; |
| 5300 | |
| 5301 | ALL_BLOCK_SYMBOLS (block, iter, sym) |
| 5302 | { |
| 5303 | if (symbol_matches_domain (SYMBOL_LANGUAGE (sym), |
| 5304 | SYMBOL_DOMAIN (sym), domain)) |
| 5305 | { |
| 5306 | int cmp; |
| 5307 | |
| 5308 | cmp = (int) '_' - (int) SYMBOL_LINKAGE_NAME (sym)[0]; |
| 5309 | if (cmp == 0) |
| 5310 | { |
| 5311 | cmp = strncmp ("_ada_", SYMBOL_LINKAGE_NAME (sym), 5); |
| 5312 | if (cmp == 0) |
| 5313 | cmp = strncmp (name, SYMBOL_LINKAGE_NAME (sym) + 5, |
| 5314 | name_len); |
| 5315 | } |
| 5316 | |
| 5317 | if (cmp == 0 |
| 5318 | && is_name_suffix (SYMBOL_LINKAGE_NAME (sym) + name_len + 5)) |
| 5319 | { |
| 5320 | if (SYMBOL_CLASS (sym) != LOC_UNRESOLVED) |
| 5321 | { |
| 5322 | if (SYMBOL_IS_ARGUMENT (sym)) |
| 5323 | arg_sym = sym; |
| 5324 | else |
| 5325 | { |
| 5326 | found_sym = 1; |
| 5327 | add_defn_to_vec (obstackp, |
| 5328 | fixup_symbol_section (sym, objfile), |
| 5329 | block); |
| 5330 | } |
| 5331 | } |
| 5332 | } |
| 5333 | } |
| 5334 | } |
| 5335 | |
| 5336 | /* NOTE: This really shouldn't be needed for _ada_ symbols. |
| 5337 | They aren't parameters, right? */ |
| 5338 | if (!found_sym && arg_sym != NULL) |
| 5339 | { |
| 5340 | add_defn_to_vec (obstackp, |
| 5341 | fixup_symbol_section (arg_sym, objfile), |
| 5342 | block); |
| 5343 | } |
| 5344 | } |
| 5345 | } |
| 5346 | \f |
| 5347 | |
| 5348 | /* Symbol Completion */ |
| 5349 | |
| 5350 | /* If SYM_NAME is a completion candidate for TEXT, return this symbol |
| 5351 | name in a form that's appropriate for the completion. The result |
| 5352 | does not need to be deallocated, but is only good until the next call. |
| 5353 | |
| 5354 | TEXT_LEN is equal to the length of TEXT. |
| 5355 | Perform a wild match if WILD_MATCH is set. |
| 5356 | ENCODED should be set if TEXT represents the start of a symbol name |
| 5357 | in its encoded form. */ |
| 5358 | |
| 5359 | static const char * |
| 5360 | symbol_completion_match (const char *sym_name, |
| 5361 | const char *text, int text_len, |
| 5362 | int wild_match, int encoded) |
| 5363 | { |
| 5364 | const int verbatim_match = (text[0] == '<'); |
| 5365 | int match = 0; |
| 5366 | |
| 5367 | if (verbatim_match) |
| 5368 | { |
| 5369 | /* Strip the leading angle bracket. */ |
| 5370 | text = text + 1; |
| 5371 | text_len--; |
| 5372 | } |
| 5373 | |
| 5374 | /* First, test against the fully qualified name of the symbol. */ |
| 5375 | |
| 5376 | if (strncmp (sym_name, text, text_len) == 0) |
| 5377 | match = 1; |
| 5378 | |
| 5379 | if (match && !encoded) |
| 5380 | { |
| 5381 | /* One needed check before declaring a positive match is to verify |
| 5382 | that iff we are doing a verbatim match, the decoded version |
| 5383 | of the symbol name starts with '<'. Otherwise, this symbol name |
| 5384 | is not a suitable completion. */ |
| 5385 | const char *sym_name_copy = sym_name; |
| 5386 | int has_angle_bracket; |
| 5387 | |
| 5388 | sym_name = ada_decode (sym_name); |
| 5389 | has_angle_bracket = (sym_name[0] == '<'); |
| 5390 | match = (has_angle_bracket == verbatim_match); |
| 5391 | sym_name = sym_name_copy; |
| 5392 | } |
| 5393 | |
| 5394 | if (match && !verbatim_match) |
| 5395 | { |
| 5396 | /* When doing non-verbatim match, another check that needs to |
| 5397 | be done is to verify that the potentially matching symbol name |
| 5398 | does not include capital letters, because the ada-mode would |
| 5399 | not be able to understand these symbol names without the |
| 5400 | angle bracket notation. */ |
| 5401 | const char *tmp; |
| 5402 | |
| 5403 | for (tmp = sym_name; *tmp != '\0' && !isupper (*tmp); tmp++); |
| 5404 | if (*tmp != '\0') |
| 5405 | match = 0; |
| 5406 | } |
| 5407 | |
| 5408 | /* Second: Try wild matching... */ |
| 5409 | |
| 5410 | if (!match && wild_match) |
| 5411 | { |
| 5412 | /* Since we are doing wild matching, this means that TEXT |
| 5413 | may represent an unqualified symbol name. We therefore must |
| 5414 | also compare TEXT against the unqualified name of the symbol. */ |
| 5415 | sym_name = ada_unqualified_name (ada_decode (sym_name)); |
| 5416 | |
| 5417 | if (strncmp (sym_name, text, text_len) == 0) |
| 5418 | match = 1; |
| 5419 | } |
| 5420 | |
| 5421 | /* Finally: If we found a mach, prepare the result to return. */ |
| 5422 | |
| 5423 | if (!match) |
| 5424 | return NULL; |
| 5425 | |
| 5426 | if (verbatim_match) |
| 5427 | sym_name = add_angle_brackets (sym_name); |
| 5428 | |
| 5429 | if (!encoded) |
| 5430 | sym_name = ada_decode (sym_name); |
| 5431 | |
| 5432 | return sym_name; |
| 5433 | } |
| 5434 | |
| 5435 | DEF_VEC_P (char_ptr); |
| 5436 | |
| 5437 | /* A companion function to ada_make_symbol_completion_list(). |
| 5438 | Check if SYM_NAME represents a symbol which name would be suitable |
| 5439 | to complete TEXT (TEXT_LEN is the length of TEXT), in which case |
| 5440 | it is appended at the end of the given string vector SV. |
| 5441 | |
| 5442 | ORIG_TEXT is the string original string from the user command |
| 5443 | that needs to be completed. WORD is the entire command on which |
| 5444 | completion should be performed. These two parameters are used to |
| 5445 | determine which part of the symbol name should be added to the |
| 5446 | completion vector. |
| 5447 | if WILD_MATCH is set, then wild matching is performed. |
| 5448 | ENCODED should be set if TEXT represents a symbol name in its |
| 5449 | encoded formed (in which case the completion should also be |
| 5450 | encoded). */ |
| 5451 | |
| 5452 | static void |
| 5453 | symbol_completion_add (VEC(char_ptr) **sv, |
| 5454 | const char *sym_name, |
| 5455 | const char *text, int text_len, |
| 5456 | const char *orig_text, const char *word, |
| 5457 | int wild_match, int encoded) |
| 5458 | { |
| 5459 | const char *match = symbol_completion_match (sym_name, text, text_len, |
| 5460 | wild_match, encoded); |
| 5461 | char *completion; |
| 5462 | |
| 5463 | if (match == NULL) |
| 5464 | return; |
| 5465 | |
| 5466 | /* We found a match, so add the appropriate completion to the given |
| 5467 | string vector. */ |
| 5468 | |
| 5469 | if (word == orig_text) |
| 5470 | { |
| 5471 | completion = xmalloc (strlen (match) + 5); |
| 5472 | strcpy (completion, match); |
| 5473 | } |
| 5474 | else if (word > orig_text) |
| 5475 | { |
| 5476 | /* Return some portion of sym_name. */ |
| 5477 | completion = xmalloc (strlen (match) + 5); |
| 5478 | strcpy (completion, match + (word - orig_text)); |
| 5479 | } |
| 5480 | else |
| 5481 | { |
| 5482 | /* Return some of ORIG_TEXT plus sym_name. */ |
| 5483 | completion = xmalloc (strlen (match) + (orig_text - word) + 5); |
| 5484 | strncpy (completion, word, orig_text - word); |
| 5485 | completion[orig_text - word] = '\0'; |
| 5486 | strcat (completion, match); |
| 5487 | } |
| 5488 | |
| 5489 | VEC_safe_push (char_ptr, *sv, completion); |
| 5490 | } |
| 5491 | |
| 5492 | /* An object of this type is passed as the user_data argument to the |
| 5493 | map_partial_symbol_names method. */ |
| 5494 | struct add_partial_datum |
| 5495 | { |
| 5496 | VEC(char_ptr) **completions; |
| 5497 | char *text; |
| 5498 | int text_len; |
| 5499 | char *text0; |
| 5500 | char *word; |
| 5501 | int wild_match; |
| 5502 | int encoded; |
| 5503 | }; |
| 5504 | |
| 5505 | /* A callback for map_partial_symbol_names. */ |
| 5506 | static void |
| 5507 | ada_add_partial_symbol_completions (const char *name, void *user_data) |
| 5508 | { |
| 5509 | struct add_partial_datum *data = user_data; |
| 5510 | |
| 5511 | symbol_completion_add (data->completions, name, |
| 5512 | data->text, data->text_len, data->text0, data->word, |
| 5513 | data->wild_match, data->encoded); |
| 5514 | } |
| 5515 | |
| 5516 | /* Return a list of possible symbol names completing TEXT0. The list |
| 5517 | is NULL terminated. WORD is the entire command on which completion |
| 5518 | is made. */ |
| 5519 | |
| 5520 | static char ** |
| 5521 | ada_make_symbol_completion_list (char *text0, char *word) |
| 5522 | { |
| 5523 | char *text; |
| 5524 | int text_len; |
| 5525 | int wild_match; |
| 5526 | int encoded; |
| 5527 | VEC(char_ptr) *completions = VEC_alloc (char_ptr, 128); |
| 5528 | struct symbol *sym; |
| 5529 | struct symtab *s; |
| 5530 | struct minimal_symbol *msymbol; |
| 5531 | struct objfile *objfile; |
| 5532 | struct block *b, *surrounding_static_block = 0; |
| 5533 | int i; |
| 5534 | struct dict_iterator iter; |
| 5535 | |
| 5536 | if (text0[0] == '<') |
| 5537 | { |
| 5538 | text = xstrdup (text0); |
| 5539 | make_cleanup (xfree, text); |
| 5540 | text_len = strlen (text); |
| 5541 | wild_match = 0; |
| 5542 | encoded = 1; |
| 5543 | } |
| 5544 | else |
| 5545 | { |
| 5546 | text = xstrdup (ada_encode (text0)); |
| 5547 | make_cleanup (xfree, text); |
| 5548 | text_len = strlen (text); |
| 5549 | for (i = 0; i < text_len; i++) |
| 5550 | text[i] = tolower (text[i]); |
| 5551 | |
| 5552 | encoded = (strstr (text0, "__") != NULL); |
| 5553 | /* If the name contains a ".", then the user is entering a fully |
| 5554 | qualified entity name, and the match must not be done in wild |
| 5555 | mode. Similarly, if the user wants to complete what looks like |
| 5556 | an encoded name, the match must not be done in wild mode. */ |
| 5557 | wild_match = (strchr (text0, '.') == NULL && !encoded); |
| 5558 | } |
| 5559 | |
| 5560 | /* First, look at the partial symtab symbols. */ |
| 5561 | { |
| 5562 | struct add_partial_datum data; |
| 5563 | |
| 5564 | data.completions = &completions; |
| 5565 | data.text = text; |
| 5566 | data.text_len = text_len; |
| 5567 | data.text0 = text0; |
| 5568 | data.word = word; |
| 5569 | data.wild_match = wild_match; |
| 5570 | data.encoded = encoded; |
| 5571 | map_partial_symbol_names (ada_add_partial_symbol_completions, &data); |
| 5572 | } |
| 5573 | |
| 5574 | /* At this point scan through the misc symbol vectors and add each |
| 5575 | symbol you find to the list. Eventually we want to ignore |
| 5576 | anything that isn't a text symbol (everything else will be |
| 5577 | handled by the psymtab code above). */ |
| 5578 | |
| 5579 | ALL_MSYMBOLS (objfile, msymbol) |
| 5580 | { |
| 5581 | QUIT; |
| 5582 | symbol_completion_add (&completions, SYMBOL_LINKAGE_NAME (msymbol), |
| 5583 | text, text_len, text0, word, wild_match, encoded); |
| 5584 | } |
| 5585 | |
| 5586 | /* Search upwards from currently selected frame (so that we can |
| 5587 | complete on local vars. */ |
| 5588 | |
| 5589 | for (b = get_selected_block (0); b != NULL; b = BLOCK_SUPERBLOCK (b)) |
| 5590 | { |
| 5591 | if (!BLOCK_SUPERBLOCK (b)) |
| 5592 | surrounding_static_block = b; /* For elmin of dups */ |
| 5593 | |
| 5594 | ALL_BLOCK_SYMBOLS (b, iter, sym) |
| 5595 | { |
| 5596 | symbol_completion_add (&completions, SYMBOL_LINKAGE_NAME (sym), |
| 5597 | text, text_len, text0, word, |
| 5598 | wild_match, encoded); |
| 5599 | } |
| 5600 | } |
| 5601 | |
| 5602 | /* Go through the symtabs and check the externs and statics for |
| 5603 | symbols which match. */ |
| 5604 | |
| 5605 | ALL_SYMTABS (objfile, s) |
| 5606 | { |
| 5607 | QUIT; |
| 5608 | b = BLOCKVECTOR_BLOCK (BLOCKVECTOR (s), GLOBAL_BLOCK); |
| 5609 | ALL_BLOCK_SYMBOLS (b, iter, sym) |
| 5610 | { |
| 5611 | symbol_completion_add (&completions, SYMBOL_LINKAGE_NAME (sym), |
| 5612 | text, text_len, text0, word, |
| 5613 | wild_match, encoded); |
| 5614 | } |
| 5615 | } |
| 5616 | |
| 5617 | ALL_SYMTABS (objfile, s) |
| 5618 | { |
| 5619 | QUIT; |
| 5620 | b = BLOCKVECTOR_BLOCK (BLOCKVECTOR (s), STATIC_BLOCK); |
| 5621 | /* Don't do this block twice. */ |
| 5622 | if (b == surrounding_static_block) |
| 5623 | continue; |
| 5624 | ALL_BLOCK_SYMBOLS (b, iter, sym) |
| 5625 | { |
| 5626 | symbol_completion_add (&completions, SYMBOL_LINKAGE_NAME (sym), |
| 5627 | text, text_len, text0, word, |
| 5628 | wild_match, encoded); |
| 5629 | } |
| 5630 | } |
| 5631 | |
| 5632 | /* Append the closing NULL entry. */ |
| 5633 | VEC_safe_push (char_ptr, completions, NULL); |
| 5634 | |
| 5635 | /* Make a copy of the COMPLETIONS VEC before we free it, and then |
| 5636 | return the copy. It's unfortunate that we have to make a copy |
| 5637 | of an array that we're about to destroy, but there is nothing much |
| 5638 | we can do about it. Fortunately, it's typically not a very large |
| 5639 | array. */ |
| 5640 | { |
| 5641 | const size_t completions_size = |
| 5642 | VEC_length (char_ptr, completions) * sizeof (char *); |
| 5643 | char **result = xmalloc (completions_size); |
| 5644 | |
| 5645 | memcpy (result, VEC_address (char_ptr, completions), completions_size); |
| 5646 | |
| 5647 | VEC_free (char_ptr, completions); |
| 5648 | return result; |
| 5649 | } |
| 5650 | } |
| 5651 | |
| 5652 | /* Field Access */ |
| 5653 | |
| 5654 | /* Return non-zero if TYPE is a pointer to the GNAT dispatch table used |
| 5655 | for tagged types. */ |
| 5656 | |
| 5657 | static int |
| 5658 | ada_is_dispatch_table_ptr_type (struct type *type) |
| 5659 | { |
| 5660 | char *name; |
| 5661 | |
| 5662 | if (TYPE_CODE (type) != TYPE_CODE_PTR) |
| 5663 | return 0; |
| 5664 | |
| 5665 | name = TYPE_NAME (TYPE_TARGET_TYPE (type)); |
| 5666 | if (name == NULL) |
| 5667 | return 0; |
| 5668 | |
| 5669 | return (strcmp (name, "ada__tags__dispatch_table") == 0); |
| 5670 | } |
| 5671 | |
| 5672 | /* True if field number FIELD_NUM in struct or union type TYPE is supposed |
| 5673 | to be invisible to users. */ |
| 5674 | |
| 5675 | int |
| 5676 | ada_is_ignored_field (struct type *type, int field_num) |
| 5677 | { |
| 5678 | if (field_num < 0 || field_num > TYPE_NFIELDS (type)) |
| 5679 | return 1; |
| 5680 | |
| 5681 | /* Check the name of that field. */ |
| 5682 | { |
| 5683 | const char *name = TYPE_FIELD_NAME (type, field_num); |
| 5684 | |
| 5685 | /* Anonymous field names should not be printed. |
| 5686 | brobecker/2007-02-20: I don't think this can actually happen |
| 5687 | but we don't want to print the value of annonymous fields anyway. */ |
| 5688 | if (name == NULL) |
| 5689 | return 1; |
| 5690 | |
| 5691 | /* A field named "_parent" is internally generated by GNAT for |
| 5692 | tagged types, and should not be printed either. */ |
| 5693 | if (name[0] == '_' && strncmp (name, "_parent", 7) != 0) |
| 5694 | return 1; |
| 5695 | } |
| 5696 | |
| 5697 | /* If this is the dispatch table of a tagged type, then ignore. */ |
| 5698 | if (ada_is_tagged_type (type, 1) |
| 5699 | && ada_is_dispatch_table_ptr_type (TYPE_FIELD_TYPE (type, field_num))) |
| 5700 | return 1; |
| 5701 | |
| 5702 | /* Not a special field, so it should not be ignored. */ |
| 5703 | return 0; |
| 5704 | } |
| 5705 | |
| 5706 | /* True iff TYPE has a tag field. If REFOK, then TYPE may also be a |
| 5707 | pointer or reference type whose ultimate target has a tag field. */ |
| 5708 | |
| 5709 | int |
| 5710 | ada_is_tagged_type (struct type *type, int refok) |
| 5711 | { |
| 5712 | return (ada_lookup_struct_elt_type (type, "_tag", refok, 1, NULL) != NULL); |
| 5713 | } |
| 5714 | |
| 5715 | /* True iff TYPE represents the type of X'Tag */ |
| 5716 | |
| 5717 | int |
| 5718 | ada_is_tag_type (struct type *type) |
| 5719 | { |
| 5720 | if (type == NULL || TYPE_CODE (type) != TYPE_CODE_PTR) |
| 5721 | return 0; |
| 5722 | else |
| 5723 | { |
| 5724 | const char *name = ada_type_name (TYPE_TARGET_TYPE (type)); |
| 5725 | |
| 5726 | return (name != NULL |
| 5727 | && strcmp (name, "ada__tags__dispatch_table") == 0); |
| 5728 | } |
| 5729 | } |
| 5730 | |
| 5731 | /* The type of the tag on VAL. */ |
| 5732 | |
| 5733 | struct type * |
| 5734 | ada_tag_type (struct value *val) |
| 5735 | { |
| 5736 | return ada_lookup_struct_elt_type (value_type (val), "_tag", 1, 0, NULL); |
| 5737 | } |
| 5738 | |
| 5739 | /* The value of the tag on VAL. */ |
| 5740 | |
| 5741 | struct value * |
| 5742 | ada_value_tag (struct value *val) |
| 5743 | { |
| 5744 | return ada_value_struct_elt (val, "_tag", 0); |
| 5745 | } |
| 5746 | |
| 5747 | /* The value of the tag on the object of type TYPE whose contents are |
| 5748 | saved at VALADDR, if it is non-null, or is at memory address |
| 5749 | ADDRESS. */ |
| 5750 | |
| 5751 | static struct value * |
| 5752 | value_tag_from_contents_and_address (struct type *type, |
| 5753 | const gdb_byte *valaddr, |
| 5754 | CORE_ADDR address) |
| 5755 | { |
| 5756 | int tag_byte_offset; |
| 5757 | struct type *tag_type; |
| 5758 | |
| 5759 | if (find_struct_field ("_tag", type, 0, &tag_type, &tag_byte_offset, |
| 5760 | NULL, NULL, NULL)) |
| 5761 | { |
| 5762 | const gdb_byte *valaddr1 = ((valaddr == NULL) |
| 5763 | ? NULL |
| 5764 | : valaddr + tag_byte_offset); |
| 5765 | CORE_ADDR address1 = (address == 0) ? 0 : address + tag_byte_offset; |
| 5766 | |
| 5767 | return value_from_contents_and_address (tag_type, valaddr1, address1); |
| 5768 | } |
| 5769 | return NULL; |
| 5770 | } |
| 5771 | |
| 5772 | static struct type * |
| 5773 | type_from_tag (struct value *tag) |
| 5774 | { |
| 5775 | const char *type_name = ada_tag_name (tag); |
| 5776 | |
| 5777 | if (type_name != NULL) |
| 5778 | return ada_find_any_type (ada_encode (type_name)); |
| 5779 | return NULL; |
| 5780 | } |
| 5781 | |
| 5782 | struct tag_args |
| 5783 | { |
| 5784 | struct value *tag; |
| 5785 | char *name; |
| 5786 | }; |
| 5787 | |
| 5788 | |
| 5789 | static int ada_tag_name_1 (void *); |
| 5790 | static int ada_tag_name_2 (struct tag_args *); |
| 5791 | |
| 5792 | /* Wrapper function used by ada_tag_name. Given a struct tag_args* |
| 5793 | value ARGS, sets ARGS->name to the tag name of ARGS->tag. |
| 5794 | The value stored in ARGS->name is valid until the next call to |
| 5795 | ada_tag_name_1. */ |
| 5796 | |
| 5797 | static int |
| 5798 | ada_tag_name_1 (void *args0) |
| 5799 | { |
| 5800 | struct tag_args *args = (struct tag_args *) args0; |
| 5801 | static char name[1024]; |
| 5802 | char *p; |
| 5803 | struct value *val; |
| 5804 | |
| 5805 | args->name = NULL; |
| 5806 | val = ada_value_struct_elt (args->tag, "tsd", 1); |
| 5807 | if (val == NULL) |
| 5808 | return ada_tag_name_2 (args); |
| 5809 | val = ada_value_struct_elt (val, "expanded_name", 1); |
| 5810 | if (val == NULL) |
| 5811 | return 0; |
| 5812 | read_memory_string (value_as_address (val), name, sizeof (name) - 1); |
| 5813 | for (p = name; *p != '\0'; p += 1) |
| 5814 | if (isalpha (*p)) |
| 5815 | *p = tolower (*p); |
| 5816 | args->name = name; |
| 5817 | return 0; |
| 5818 | } |
| 5819 | |
| 5820 | /* Return the "ada__tags__type_specific_data" type. */ |
| 5821 | |
| 5822 | static struct type * |
| 5823 | ada_get_tsd_type (struct inferior *inf) |
| 5824 | { |
| 5825 | struct ada_inferior_data *data = get_ada_inferior_data (inf); |
| 5826 | |
| 5827 | if (data->tsd_type == 0) |
| 5828 | data->tsd_type = ada_find_any_type ("ada__tags__type_specific_data"); |
| 5829 | return data->tsd_type; |
| 5830 | } |
| 5831 | |
| 5832 | /* Utility function for ada_tag_name_1 that tries the second |
| 5833 | representation for the dispatch table (in which there is no |
| 5834 | explicit 'tsd' field in the referent of the tag pointer, and instead |
| 5835 | the tsd pointer is stored just before the dispatch table. */ |
| 5836 | |
| 5837 | static int |
| 5838 | ada_tag_name_2 (struct tag_args *args) |
| 5839 | { |
| 5840 | struct type *info_type; |
| 5841 | static char name[1024]; |
| 5842 | char *p; |
| 5843 | struct value *val, *valp; |
| 5844 | |
| 5845 | args->name = NULL; |
| 5846 | info_type = ada_get_tsd_type (current_inferior()); |
| 5847 | if (info_type == NULL) |
| 5848 | return 0; |
| 5849 | info_type = lookup_pointer_type (lookup_pointer_type (info_type)); |
| 5850 | valp = value_cast (info_type, args->tag); |
| 5851 | if (valp == NULL) |
| 5852 | return 0; |
| 5853 | val = value_ind (value_ptradd (valp, -1)); |
| 5854 | if (val == NULL) |
| 5855 | return 0; |
| 5856 | val = ada_value_struct_elt (val, "expanded_name", 1); |
| 5857 | if (val == NULL) |
| 5858 | return 0; |
| 5859 | read_memory_string (value_as_address (val), name, sizeof (name) - 1); |
| 5860 | for (p = name; *p != '\0'; p += 1) |
| 5861 | if (isalpha (*p)) |
| 5862 | *p = tolower (*p); |
| 5863 | args->name = name; |
| 5864 | return 0; |
| 5865 | } |
| 5866 | |
| 5867 | /* The type name of the dynamic type denoted by the 'tag value TAG, as |
| 5868 | a C string. */ |
| 5869 | |
| 5870 | const char * |
| 5871 | ada_tag_name (struct value *tag) |
| 5872 | { |
| 5873 | struct tag_args args; |
| 5874 | |
| 5875 | if (!ada_is_tag_type (value_type (tag))) |
| 5876 | return NULL; |
| 5877 | args.tag = tag; |
| 5878 | args.name = NULL; |
| 5879 | catch_errors (ada_tag_name_1, &args, NULL, RETURN_MASK_ALL); |
| 5880 | return args.name; |
| 5881 | } |
| 5882 | |
| 5883 | /* The parent type of TYPE, or NULL if none. */ |
| 5884 | |
| 5885 | struct type * |
| 5886 | ada_parent_type (struct type *type) |
| 5887 | { |
| 5888 | int i; |
| 5889 | |
| 5890 | type = ada_check_typedef (type); |
| 5891 | |
| 5892 | if (type == NULL || TYPE_CODE (type) != TYPE_CODE_STRUCT) |
| 5893 | return NULL; |
| 5894 | |
| 5895 | for (i = 0; i < TYPE_NFIELDS (type); i += 1) |
| 5896 | if (ada_is_parent_field (type, i)) |
| 5897 | { |
| 5898 | struct type *parent_type = TYPE_FIELD_TYPE (type, i); |
| 5899 | |
| 5900 | /* If the _parent field is a pointer, then dereference it. */ |
| 5901 | if (TYPE_CODE (parent_type) == TYPE_CODE_PTR) |
| 5902 | parent_type = TYPE_TARGET_TYPE (parent_type); |
| 5903 | /* If there is a parallel XVS type, get the actual base type. */ |
| 5904 | parent_type = ada_get_base_type (parent_type); |
| 5905 | |
| 5906 | return ada_check_typedef (parent_type); |
| 5907 | } |
| 5908 | |
| 5909 | return NULL; |
| 5910 | } |
| 5911 | |
| 5912 | /* True iff field number FIELD_NUM of structure type TYPE contains the |
| 5913 | parent-type (inherited) fields of a derived type. Assumes TYPE is |
| 5914 | a structure type with at least FIELD_NUM+1 fields. */ |
| 5915 | |
| 5916 | int |
| 5917 | ada_is_parent_field (struct type *type, int field_num) |
| 5918 | { |
| 5919 | const char *name = TYPE_FIELD_NAME (ada_check_typedef (type), field_num); |
| 5920 | |
| 5921 | return (name != NULL |
| 5922 | && (strncmp (name, "PARENT", 6) == 0 |
| 5923 | || strncmp (name, "_parent", 7) == 0)); |
| 5924 | } |
| 5925 | |
| 5926 | /* True iff field number FIELD_NUM of structure type TYPE is a |
| 5927 | transparent wrapper field (which should be silently traversed when doing |
| 5928 | field selection and flattened when printing). Assumes TYPE is a |
| 5929 | structure type with at least FIELD_NUM+1 fields. Such fields are always |
| 5930 | structures. */ |
| 5931 | |
| 5932 | int |
| 5933 | ada_is_wrapper_field (struct type *type, int field_num) |
| 5934 | { |
| 5935 | const char *name = TYPE_FIELD_NAME (type, field_num); |
| 5936 | |
| 5937 | return (name != NULL |
| 5938 | && (strncmp (name, "PARENT", 6) == 0 |
| 5939 | || strcmp (name, "REP") == 0 |
| 5940 | || strncmp (name, "_parent", 7) == 0 |
| 5941 | || name[0] == 'S' || name[0] == 'R' || name[0] == 'O')); |
| 5942 | } |
| 5943 | |
| 5944 | /* True iff field number FIELD_NUM of structure or union type TYPE |
| 5945 | is a variant wrapper. Assumes TYPE is a structure type with at least |
| 5946 | FIELD_NUM+1 fields. */ |
| 5947 | |
| 5948 | int |
| 5949 | ada_is_variant_part (struct type *type, int field_num) |
| 5950 | { |
| 5951 | struct type *field_type = TYPE_FIELD_TYPE (type, field_num); |
| 5952 | |
| 5953 | return (TYPE_CODE (field_type) == TYPE_CODE_UNION |
| 5954 | || (is_dynamic_field (type, field_num) |
| 5955 | && (TYPE_CODE (TYPE_TARGET_TYPE (field_type)) |
| 5956 | == TYPE_CODE_UNION))); |
| 5957 | } |
| 5958 | |
| 5959 | /* Assuming that VAR_TYPE is a variant wrapper (type of the variant part) |
| 5960 | whose discriminants are contained in the record type OUTER_TYPE, |
| 5961 | returns the type of the controlling discriminant for the variant. |
| 5962 | May return NULL if the type could not be found. */ |
| 5963 | |
| 5964 | struct type * |
| 5965 | ada_variant_discrim_type (struct type *var_type, struct type *outer_type) |
| 5966 | { |
| 5967 | char *name = ada_variant_discrim_name (var_type); |
| 5968 | |
| 5969 | return ada_lookup_struct_elt_type (outer_type, name, 1, 1, NULL); |
| 5970 | } |
| 5971 | |
| 5972 | /* Assuming that TYPE is the type of a variant wrapper, and FIELD_NUM is a |
| 5973 | valid field number within it, returns 1 iff field FIELD_NUM of TYPE |
| 5974 | represents a 'when others' clause; otherwise 0. */ |
| 5975 | |
| 5976 | int |
| 5977 | ada_is_others_clause (struct type *type, int field_num) |
| 5978 | { |
| 5979 | const char *name = TYPE_FIELD_NAME (type, field_num); |
| 5980 | |
| 5981 | return (name != NULL && name[0] == 'O'); |
| 5982 | } |
| 5983 | |
| 5984 | /* Assuming that TYPE0 is the type of the variant part of a record, |
| 5985 | returns the name of the discriminant controlling the variant. |
| 5986 | The value is valid until the next call to ada_variant_discrim_name. */ |
| 5987 | |
| 5988 | char * |
| 5989 | ada_variant_discrim_name (struct type *type0) |
| 5990 | { |
| 5991 | static char *result = NULL; |
| 5992 | static size_t result_len = 0; |
| 5993 | struct type *type; |
| 5994 | const char *name; |
| 5995 | const char *discrim_end; |
| 5996 | const char *discrim_start; |
| 5997 | |
| 5998 | if (TYPE_CODE (type0) == TYPE_CODE_PTR) |
| 5999 | type = TYPE_TARGET_TYPE (type0); |
| 6000 | else |
| 6001 | type = type0; |
| 6002 | |
| 6003 | name = ada_type_name (type); |
| 6004 | |
| 6005 | if (name == NULL || name[0] == '\000') |
| 6006 | return ""; |
| 6007 | |
| 6008 | for (discrim_end = name + strlen (name) - 6; discrim_end != name; |
| 6009 | discrim_end -= 1) |
| 6010 | { |
| 6011 | if (strncmp (discrim_end, "___XVN", 6) == 0) |
| 6012 | break; |
| 6013 | } |
| 6014 | if (discrim_end == name) |
| 6015 | return ""; |
| 6016 | |
| 6017 | for (discrim_start = discrim_end; discrim_start != name + 3; |
| 6018 | discrim_start -= 1) |
| 6019 | { |
| 6020 | if (discrim_start == name + 1) |
| 6021 | return ""; |
| 6022 | if ((discrim_start > name + 3 |
| 6023 | && strncmp (discrim_start - 3, "___", 3) == 0) |
| 6024 | || discrim_start[-1] == '.') |
| 6025 | break; |
| 6026 | } |
| 6027 | |
| 6028 | GROW_VECT (result, result_len, discrim_end - discrim_start + 1); |
| 6029 | strncpy (result, discrim_start, discrim_end - discrim_start); |
| 6030 | result[discrim_end - discrim_start] = '\0'; |
| 6031 | return result; |
| 6032 | } |
| 6033 | |
| 6034 | /* Scan STR for a subtype-encoded number, beginning at position K. |
| 6035 | Put the position of the character just past the number scanned in |
| 6036 | *NEW_K, if NEW_K!=NULL. Put the scanned number in *R, if R!=NULL. |
| 6037 | Return 1 if there was a valid number at the given position, and 0 |
| 6038 | otherwise. A "subtype-encoded" number consists of the absolute value |
| 6039 | in decimal, followed by the letter 'm' to indicate a negative number. |
| 6040 | Assumes 0m does not occur. */ |
| 6041 | |
| 6042 | int |
| 6043 | ada_scan_number (const char str[], int k, LONGEST * R, int *new_k) |
| 6044 | { |
| 6045 | ULONGEST RU; |
| 6046 | |
| 6047 | if (!isdigit (str[k])) |
| 6048 | return 0; |
| 6049 | |
| 6050 | /* Do it the hard way so as not to make any assumption about |
| 6051 | the relationship of unsigned long (%lu scan format code) and |
| 6052 | LONGEST. */ |
| 6053 | RU = 0; |
| 6054 | while (isdigit (str[k])) |
| 6055 | { |
| 6056 | RU = RU * 10 + (str[k] - '0'); |
| 6057 | k += 1; |
| 6058 | } |
| 6059 | |
| 6060 | if (str[k] == 'm') |
| 6061 | { |
| 6062 | if (R != NULL) |
| 6063 | *R = (-(LONGEST) (RU - 1)) - 1; |
| 6064 | k += 1; |
| 6065 | } |
| 6066 | else if (R != NULL) |
| 6067 | *R = (LONGEST) RU; |
| 6068 | |
| 6069 | /* NOTE on the above: Technically, C does not say what the results of |
| 6070 | - (LONGEST) RU or (LONGEST) -RU are for RU == largest positive |
| 6071 | number representable as a LONGEST (although either would probably work |
| 6072 | in most implementations). When RU>0, the locution in the then branch |
| 6073 | above is always equivalent to the negative of RU. */ |
| 6074 | |
| 6075 | if (new_k != NULL) |
| 6076 | *new_k = k; |
| 6077 | return 1; |
| 6078 | } |
| 6079 | |
| 6080 | /* Assuming that TYPE is a variant part wrapper type (a VARIANTS field), |
| 6081 | and FIELD_NUM is a valid field number within it, returns 1 iff VAL is |
| 6082 | in the range encoded by field FIELD_NUM of TYPE; otherwise 0. */ |
| 6083 | |
| 6084 | int |
| 6085 | ada_in_variant (LONGEST val, struct type *type, int field_num) |
| 6086 | { |
| 6087 | const char *name = TYPE_FIELD_NAME (type, field_num); |
| 6088 | int p; |
| 6089 | |
| 6090 | p = 0; |
| 6091 | while (1) |
| 6092 | { |
| 6093 | switch (name[p]) |
| 6094 | { |
| 6095 | case '\0': |
| 6096 | return 0; |
| 6097 | case 'S': |
| 6098 | { |
| 6099 | LONGEST W; |
| 6100 | |
| 6101 | if (!ada_scan_number (name, p + 1, &W, &p)) |
| 6102 | return 0; |
| 6103 | if (val == W) |
| 6104 | return 1; |
| 6105 | break; |
| 6106 | } |
| 6107 | case 'R': |
| 6108 | { |
| 6109 | LONGEST L, U; |
| 6110 | |
| 6111 | if (!ada_scan_number (name, p + 1, &L, &p) |
| 6112 | || name[p] != 'T' || !ada_scan_number (name, p + 1, &U, &p)) |
| 6113 | return 0; |
| 6114 | if (val >= L && val <= U) |
| 6115 | return 1; |
| 6116 | break; |
| 6117 | } |
| 6118 | case 'O': |
| 6119 | return 1; |
| 6120 | default: |
| 6121 | return 0; |
| 6122 | } |
| 6123 | } |
| 6124 | } |
| 6125 | |
| 6126 | /* FIXME: Lots of redundancy below. Try to consolidate. */ |
| 6127 | |
| 6128 | /* Given a value ARG1 (offset by OFFSET bytes) of a struct or union type |
| 6129 | ARG_TYPE, extract and return the value of one of its (non-static) |
| 6130 | fields. FIELDNO says which field. Differs from value_primitive_field |
| 6131 | only in that it can handle packed values of arbitrary type. */ |
| 6132 | |
| 6133 | static struct value * |
| 6134 | ada_value_primitive_field (struct value *arg1, int offset, int fieldno, |
| 6135 | struct type *arg_type) |
| 6136 | { |
| 6137 | struct type *type; |
| 6138 | |
| 6139 | arg_type = ada_check_typedef (arg_type); |
| 6140 | type = TYPE_FIELD_TYPE (arg_type, fieldno); |
| 6141 | |
| 6142 | /* Handle packed fields. */ |
| 6143 | |
| 6144 | if (TYPE_FIELD_BITSIZE (arg_type, fieldno) != 0) |
| 6145 | { |
| 6146 | int bit_pos = TYPE_FIELD_BITPOS (arg_type, fieldno); |
| 6147 | int bit_size = TYPE_FIELD_BITSIZE (arg_type, fieldno); |
| 6148 | |
| 6149 | return ada_value_primitive_packed_val (arg1, value_contents (arg1), |
| 6150 | offset + bit_pos / 8, |
| 6151 | bit_pos % 8, bit_size, type); |
| 6152 | } |
| 6153 | else |
| 6154 | return value_primitive_field (arg1, offset, fieldno, arg_type); |
| 6155 | } |
| 6156 | |
| 6157 | /* Find field with name NAME in object of type TYPE. If found, |
| 6158 | set the following for each argument that is non-null: |
| 6159 | - *FIELD_TYPE_P to the field's type; |
| 6160 | - *BYTE_OFFSET_P to OFFSET + the byte offset of the field within |
| 6161 | an object of that type; |
| 6162 | - *BIT_OFFSET_P to the bit offset modulo byte size of the field; |
| 6163 | - *BIT_SIZE_P to its size in bits if the field is packed, and |
| 6164 | 0 otherwise; |
| 6165 | If INDEX_P is non-null, increment *INDEX_P by the number of source-visible |
| 6166 | fields up to but not including the desired field, or by the total |
| 6167 | number of fields if not found. A NULL value of NAME never |
| 6168 | matches; the function just counts visible fields in this case. |
| 6169 | |
| 6170 | Returns 1 if found, 0 otherwise. */ |
| 6171 | |
| 6172 | static int |
| 6173 | find_struct_field (char *name, struct type *type, int offset, |
| 6174 | struct type **field_type_p, |
| 6175 | int *byte_offset_p, int *bit_offset_p, int *bit_size_p, |
| 6176 | int *index_p) |
| 6177 | { |
| 6178 | int i; |
| 6179 | |
| 6180 | type = ada_check_typedef (type); |
| 6181 | |
| 6182 | if (field_type_p != NULL) |
| 6183 | *field_type_p = NULL; |
| 6184 | if (byte_offset_p != NULL) |
| 6185 | *byte_offset_p = 0; |
| 6186 | if (bit_offset_p != NULL) |
| 6187 | *bit_offset_p = 0; |
| 6188 | if (bit_size_p != NULL) |
| 6189 | *bit_size_p = 0; |
| 6190 | |
| 6191 | for (i = 0; i < TYPE_NFIELDS (type); i += 1) |
| 6192 | { |
| 6193 | int bit_pos = TYPE_FIELD_BITPOS (type, i); |
| 6194 | int fld_offset = offset + bit_pos / 8; |
| 6195 | char *t_field_name = TYPE_FIELD_NAME (type, i); |
| 6196 | |
| 6197 | if (t_field_name == NULL) |
| 6198 | continue; |
| 6199 | |
| 6200 | else if (name != NULL && field_name_match (t_field_name, name)) |
| 6201 | { |
| 6202 | int bit_size = TYPE_FIELD_BITSIZE (type, i); |
| 6203 | |
| 6204 | if (field_type_p != NULL) |
| 6205 | *field_type_p = TYPE_FIELD_TYPE (type, i); |
| 6206 | if (byte_offset_p != NULL) |
| 6207 | *byte_offset_p = fld_offset; |
| 6208 | if (bit_offset_p != NULL) |
| 6209 | *bit_offset_p = bit_pos % 8; |
| 6210 | if (bit_size_p != NULL) |
| 6211 | *bit_size_p = bit_size; |
| 6212 | return 1; |
| 6213 | } |
| 6214 | else if (ada_is_wrapper_field (type, i)) |
| 6215 | { |
| 6216 | if (find_struct_field (name, TYPE_FIELD_TYPE (type, i), fld_offset, |
| 6217 | field_type_p, byte_offset_p, bit_offset_p, |
| 6218 | bit_size_p, index_p)) |
| 6219 | return 1; |
| 6220 | } |
| 6221 | else if (ada_is_variant_part (type, i)) |
| 6222 | { |
| 6223 | /* PNH: Wait. Do we ever execute this section, or is ARG always of |
| 6224 | fixed type?? */ |
| 6225 | int j; |
| 6226 | struct type *field_type |
| 6227 | = ada_check_typedef (TYPE_FIELD_TYPE (type, i)); |
| 6228 | |
| 6229 | for (j = 0; j < TYPE_NFIELDS (field_type); j += 1) |
| 6230 | { |
| 6231 | if (find_struct_field (name, TYPE_FIELD_TYPE (field_type, j), |
| 6232 | fld_offset |
| 6233 | + TYPE_FIELD_BITPOS (field_type, j) / 8, |
| 6234 | field_type_p, byte_offset_p, |
| 6235 | bit_offset_p, bit_size_p, index_p)) |
| 6236 | return 1; |
| 6237 | } |
| 6238 | } |
| 6239 | else if (index_p != NULL) |
| 6240 | *index_p += 1; |
| 6241 | } |
| 6242 | return 0; |
| 6243 | } |
| 6244 | |
| 6245 | /* Number of user-visible fields in record type TYPE. */ |
| 6246 | |
| 6247 | static int |
| 6248 | num_visible_fields (struct type *type) |
| 6249 | { |
| 6250 | int n; |
| 6251 | |
| 6252 | n = 0; |
| 6253 | find_struct_field (NULL, type, 0, NULL, NULL, NULL, NULL, &n); |
| 6254 | return n; |
| 6255 | } |
| 6256 | |
| 6257 | /* Look for a field NAME in ARG. Adjust the address of ARG by OFFSET bytes, |
| 6258 | and search in it assuming it has (class) type TYPE. |
| 6259 | If found, return value, else return NULL. |
| 6260 | |
| 6261 | Searches recursively through wrapper fields (e.g., '_parent'). */ |
| 6262 | |
| 6263 | static struct value * |
| 6264 | ada_search_struct_field (char *name, struct value *arg, int offset, |
| 6265 | struct type *type) |
| 6266 | { |
| 6267 | int i; |
| 6268 | |
| 6269 | type = ada_check_typedef (type); |
| 6270 | for (i = 0; i < TYPE_NFIELDS (type); i += 1) |
| 6271 | { |
| 6272 | char *t_field_name = TYPE_FIELD_NAME (type, i); |
| 6273 | |
| 6274 | if (t_field_name == NULL) |
| 6275 | continue; |
| 6276 | |
| 6277 | else if (field_name_match (t_field_name, name)) |
| 6278 | return ada_value_primitive_field (arg, offset, i, type); |
| 6279 | |
| 6280 | else if (ada_is_wrapper_field (type, i)) |
| 6281 | { |
| 6282 | struct value *v = /* Do not let indent join lines here. */ |
| 6283 | ada_search_struct_field (name, arg, |
| 6284 | offset + TYPE_FIELD_BITPOS (type, i) / 8, |
| 6285 | TYPE_FIELD_TYPE (type, i)); |
| 6286 | |
| 6287 | if (v != NULL) |
| 6288 | return v; |
| 6289 | } |
| 6290 | |
| 6291 | else if (ada_is_variant_part (type, i)) |
| 6292 | { |
| 6293 | /* PNH: Do we ever get here? See find_struct_field. */ |
| 6294 | int j; |
| 6295 | struct type *field_type = ada_check_typedef (TYPE_FIELD_TYPE (type, |
| 6296 | i)); |
| 6297 | int var_offset = offset + TYPE_FIELD_BITPOS (type, i) / 8; |
| 6298 | |
| 6299 | for (j = 0; j < TYPE_NFIELDS (field_type); j += 1) |
| 6300 | { |
| 6301 | struct value *v = ada_search_struct_field /* Force line |
| 6302 | break. */ |
| 6303 | (name, arg, |
| 6304 | var_offset + TYPE_FIELD_BITPOS (field_type, j) / 8, |
| 6305 | TYPE_FIELD_TYPE (field_type, j)); |
| 6306 | |
| 6307 | if (v != NULL) |
| 6308 | return v; |
| 6309 | } |
| 6310 | } |
| 6311 | } |
| 6312 | return NULL; |
| 6313 | } |
| 6314 | |
| 6315 | static struct value *ada_index_struct_field_1 (int *, struct value *, |
| 6316 | int, struct type *); |
| 6317 | |
| 6318 | |
| 6319 | /* Return field #INDEX in ARG, where the index is that returned by |
| 6320 | * find_struct_field through its INDEX_P argument. Adjust the address |
| 6321 | * of ARG by OFFSET bytes, and search in it assuming it has (class) type TYPE. |
| 6322 | * If found, return value, else return NULL. */ |
| 6323 | |
| 6324 | static struct value * |
| 6325 | ada_index_struct_field (int index, struct value *arg, int offset, |
| 6326 | struct type *type) |
| 6327 | { |
| 6328 | return ada_index_struct_field_1 (&index, arg, offset, type); |
| 6329 | } |
| 6330 | |
| 6331 | |
| 6332 | /* Auxiliary function for ada_index_struct_field. Like |
| 6333 | * ada_index_struct_field, but takes index from *INDEX_P and modifies |
| 6334 | * *INDEX_P. */ |
| 6335 | |
| 6336 | static struct value * |
| 6337 | ada_index_struct_field_1 (int *index_p, struct value *arg, int offset, |
| 6338 | struct type *type) |
| 6339 | { |
| 6340 | int i; |
| 6341 | type = ada_check_typedef (type); |
| 6342 | |
| 6343 | for (i = 0; i < TYPE_NFIELDS (type); i += 1) |
| 6344 | { |
| 6345 | if (TYPE_FIELD_NAME (type, i) == NULL) |
| 6346 | continue; |
| 6347 | else if (ada_is_wrapper_field (type, i)) |
| 6348 | { |
| 6349 | struct value *v = /* Do not let indent join lines here. */ |
| 6350 | ada_index_struct_field_1 (index_p, arg, |
| 6351 | offset + TYPE_FIELD_BITPOS (type, i) / 8, |
| 6352 | TYPE_FIELD_TYPE (type, i)); |
| 6353 | |
| 6354 | if (v != NULL) |
| 6355 | return v; |
| 6356 | } |
| 6357 | |
| 6358 | else if (ada_is_variant_part (type, i)) |
| 6359 | { |
| 6360 | /* PNH: Do we ever get here? See ada_search_struct_field, |
| 6361 | find_struct_field. */ |
| 6362 | error (_("Cannot assign this kind of variant record")); |
| 6363 | } |
| 6364 | else if (*index_p == 0) |
| 6365 | return ada_value_primitive_field (arg, offset, i, type); |
| 6366 | else |
| 6367 | *index_p -= 1; |
| 6368 | } |
| 6369 | return NULL; |
| 6370 | } |
| 6371 | |
| 6372 | /* Given ARG, a value of type (pointer or reference to a)* |
| 6373 | structure/union, extract the component named NAME from the ultimate |
| 6374 | target structure/union and return it as a value with its |
| 6375 | appropriate type. |
| 6376 | |
| 6377 | The routine searches for NAME among all members of the structure itself |
| 6378 | and (recursively) among all members of any wrapper members |
| 6379 | (e.g., '_parent'). |
| 6380 | |
| 6381 | If NO_ERR, then simply return NULL in case of error, rather than |
| 6382 | calling error. */ |
| 6383 | |
| 6384 | struct value * |
| 6385 | ada_value_struct_elt (struct value *arg, char *name, int no_err) |
| 6386 | { |
| 6387 | struct type *t, *t1; |
| 6388 | struct value *v; |
| 6389 | |
| 6390 | v = NULL; |
| 6391 | t1 = t = ada_check_typedef (value_type (arg)); |
| 6392 | if (TYPE_CODE (t) == TYPE_CODE_REF) |
| 6393 | { |
| 6394 | t1 = TYPE_TARGET_TYPE (t); |
| 6395 | if (t1 == NULL) |
| 6396 | goto BadValue; |
| 6397 | t1 = ada_check_typedef (t1); |
| 6398 | if (TYPE_CODE (t1) == TYPE_CODE_PTR) |
| 6399 | { |
| 6400 | arg = coerce_ref (arg); |
| 6401 | t = t1; |
| 6402 | } |
| 6403 | } |
| 6404 | |
| 6405 | while (TYPE_CODE (t) == TYPE_CODE_PTR) |
| 6406 | { |
| 6407 | t1 = TYPE_TARGET_TYPE (t); |
| 6408 | if (t1 == NULL) |
| 6409 | goto BadValue; |
| 6410 | t1 = ada_check_typedef (t1); |
| 6411 | if (TYPE_CODE (t1) == TYPE_CODE_PTR) |
| 6412 | { |
| 6413 | arg = value_ind (arg); |
| 6414 | t = t1; |
| 6415 | } |
| 6416 | else |
| 6417 | break; |
| 6418 | } |
| 6419 | |
| 6420 | if (TYPE_CODE (t1) != TYPE_CODE_STRUCT && TYPE_CODE (t1) != TYPE_CODE_UNION) |
| 6421 | goto BadValue; |
| 6422 | |
| 6423 | if (t1 == t) |
| 6424 | v = ada_search_struct_field (name, arg, 0, t); |
| 6425 | else |
| 6426 | { |
| 6427 | int bit_offset, bit_size, byte_offset; |
| 6428 | struct type *field_type; |
| 6429 | CORE_ADDR address; |
| 6430 | |
| 6431 | if (TYPE_CODE (t) == TYPE_CODE_PTR) |
| 6432 | address = value_as_address (arg); |
| 6433 | else |
| 6434 | address = unpack_pointer (t, value_contents (arg)); |
| 6435 | |
| 6436 | t1 = ada_to_fixed_type (ada_get_base_type (t1), NULL, address, NULL, 1); |
| 6437 | if (find_struct_field (name, t1, 0, |
| 6438 | &field_type, &byte_offset, &bit_offset, |
| 6439 | &bit_size, NULL)) |
| 6440 | { |
| 6441 | if (bit_size != 0) |
| 6442 | { |
| 6443 | if (TYPE_CODE (t) == TYPE_CODE_REF) |
| 6444 | arg = ada_coerce_ref (arg); |
| 6445 | else |
| 6446 | arg = ada_value_ind (arg); |
| 6447 | v = ada_value_primitive_packed_val (arg, NULL, byte_offset, |
| 6448 | bit_offset, bit_size, |
| 6449 | field_type); |
| 6450 | } |
| 6451 | else |
| 6452 | v = value_at_lazy (field_type, address + byte_offset); |
| 6453 | } |
| 6454 | } |
| 6455 | |
| 6456 | if (v != NULL || no_err) |
| 6457 | return v; |
| 6458 | else |
| 6459 | error (_("There is no member named %s."), name); |
| 6460 | |
| 6461 | BadValue: |
| 6462 | if (no_err) |
| 6463 | return NULL; |
| 6464 | else |
| 6465 | error (_("Attempt to extract a component of " |
| 6466 | "a value that is not a record.")); |
| 6467 | } |
| 6468 | |
| 6469 | /* Given a type TYPE, look up the type of the component of type named NAME. |
| 6470 | If DISPP is non-null, add its byte displacement from the beginning of a |
| 6471 | structure (pointed to by a value) of type TYPE to *DISPP (does not |
| 6472 | work for packed fields). |
| 6473 | |
| 6474 | Matches any field whose name has NAME as a prefix, possibly |
| 6475 | followed by "___". |
| 6476 | |
| 6477 | TYPE can be either a struct or union. If REFOK, TYPE may also |
| 6478 | be a (pointer or reference)+ to a struct or union, and the |
| 6479 | ultimate target type will be searched. |
| 6480 | |
| 6481 | Looks recursively into variant clauses and parent types. |
| 6482 | |
| 6483 | If NOERR is nonzero, return NULL if NAME is not suitably defined or |
| 6484 | TYPE is not a type of the right kind. */ |
| 6485 | |
| 6486 | static struct type * |
| 6487 | ada_lookup_struct_elt_type (struct type *type, char *name, int refok, |
| 6488 | int noerr, int *dispp) |
| 6489 | { |
| 6490 | int i; |
| 6491 | |
| 6492 | if (name == NULL) |
| 6493 | goto BadName; |
| 6494 | |
| 6495 | if (refok && type != NULL) |
| 6496 | while (1) |
| 6497 | { |
| 6498 | type = ada_check_typedef (type); |
| 6499 | if (TYPE_CODE (type) != TYPE_CODE_PTR |
| 6500 | && TYPE_CODE (type) != TYPE_CODE_REF) |
| 6501 | break; |
| 6502 | type = TYPE_TARGET_TYPE (type); |
| 6503 | } |
| 6504 | |
| 6505 | if (type == NULL |
| 6506 | || (TYPE_CODE (type) != TYPE_CODE_STRUCT |
| 6507 | && TYPE_CODE (type) != TYPE_CODE_UNION)) |
| 6508 | { |
| 6509 | if (noerr) |
| 6510 | return NULL; |
| 6511 | else |
| 6512 | { |
| 6513 | target_terminal_ours (); |
| 6514 | gdb_flush (gdb_stdout); |
| 6515 | if (type == NULL) |
| 6516 | error (_("Type (null) is not a structure or union type")); |
| 6517 | else |
| 6518 | { |
| 6519 | /* XXX: type_sprint */ |
| 6520 | fprintf_unfiltered (gdb_stderr, _("Type ")); |
| 6521 | type_print (type, "", gdb_stderr, -1); |
| 6522 | error (_(" is not a structure or union type")); |
| 6523 | } |
| 6524 | } |
| 6525 | } |
| 6526 | |
| 6527 | type = to_static_fixed_type (type); |
| 6528 | |
| 6529 | for (i = 0; i < TYPE_NFIELDS (type); i += 1) |
| 6530 | { |
| 6531 | char *t_field_name = TYPE_FIELD_NAME (type, i); |
| 6532 | struct type *t; |
| 6533 | int disp; |
| 6534 | |
| 6535 | if (t_field_name == NULL) |
| 6536 | continue; |
| 6537 | |
| 6538 | else if (field_name_match (t_field_name, name)) |
| 6539 | { |
| 6540 | if (dispp != NULL) |
| 6541 | *dispp += TYPE_FIELD_BITPOS (type, i) / 8; |
| 6542 | return ada_check_typedef (TYPE_FIELD_TYPE (type, i)); |
| 6543 | } |
| 6544 | |
| 6545 | else if (ada_is_wrapper_field (type, i)) |
| 6546 | { |
| 6547 | disp = 0; |
| 6548 | t = ada_lookup_struct_elt_type (TYPE_FIELD_TYPE (type, i), name, |
| 6549 | 0, 1, &disp); |
| 6550 | if (t != NULL) |
| 6551 | { |
| 6552 | if (dispp != NULL) |
| 6553 | *dispp += disp + TYPE_FIELD_BITPOS (type, i) / 8; |
| 6554 | return t; |
| 6555 | } |
| 6556 | } |
| 6557 | |
| 6558 | else if (ada_is_variant_part (type, i)) |
| 6559 | { |
| 6560 | int j; |
| 6561 | struct type *field_type = ada_check_typedef (TYPE_FIELD_TYPE (type, |
| 6562 | i)); |
| 6563 | |
| 6564 | for (j = TYPE_NFIELDS (field_type) - 1; j >= 0; j -= 1) |
| 6565 | { |
| 6566 | /* FIXME pnh 2008/01/26: We check for a field that is |
| 6567 | NOT wrapped in a struct, since the compiler sometimes |
| 6568 | generates these for unchecked variant types. Revisit |
| 6569 | if the compiler changes this practice. */ |
| 6570 | char *v_field_name = TYPE_FIELD_NAME (field_type, j); |
| 6571 | disp = 0; |
| 6572 | if (v_field_name != NULL |
| 6573 | && field_name_match (v_field_name, name)) |
| 6574 | t = ada_check_typedef (TYPE_FIELD_TYPE (field_type, j)); |
| 6575 | else |
| 6576 | t = ada_lookup_struct_elt_type (TYPE_FIELD_TYPE (field_type, |
| 6577 | j), |
| 6578 | name, 0, 1, &disp); |
| 6579 | |
| 6580 | if (t != NULL) |
| 6581 | { |
| 6582 | if (dispp != NULL) |
| 6583 | *dispp += disp + TYPE_FIELD_BITPOS (type, i) / 8; |
| 6584 | return t; |
| 6585 | } |
| 6586 | } |
| 6587 | } |
| 6588 | |
| 6589 | } |
| 6590 | |
| 6591 | BadName: |
| 6592 | if (!noerr) |
| 6593 | { |
| 6594 | target_terminal_ours (); |
| 6595 | gdb_flush (gdb_stdout); |
| 6596 | if (name == NULL) |
| 6597 | { |
| 6598 | /* XXX: type_sprint */ |
| 6599 | fprintf_unfiltered (gdb_stderr, _("Type ")); |
| 6600 | type_print (type, "", gdb_stderr, -1); |
| 6601 | error (_(" has no component named <null>")); |
| 6602 | } |
| 6603 | else |
| 6604 | { |
| 6605 | /* XXX: type_sprint */ |
| 6606 | fprintf_unfiltered (gdb_stderr, _("Type ")); |
| 6607 | type_print (type, "", gdb_stderr, -1); |
| 6608 | error (_(" has no component named %s"), name); |
| 6609 | } |
| 6610 | } |
| 6611 | |
| 6612 | return NULL; |
| 6613 | } |
| 6614 | |
| 6615 | /* Assuming that VAR_TYPE is the type of a variant part of a record (a union), |
| 6616 | within a value of type OUTER_TYPE, return true iff VAR_TYPE |
| 6617 | represents an unchecked union (that is, the variant part of a |
| 6618 | record that is named in an Unchecked_Union pragma). */ |
| 6619 | |
| 6620 | static int |
| 6621 | is_unchecked_variant (struct type *var_type, struct type *outer_type) |
| 6622 | { |
| 6623 | char *discrim_name = ada_variant_discrim_name (var_type); |
| 6624 | |
| 6625 | return (ada_lookup_struct_elt_type (outer_type, discrim_name, 0, 1, NULL) |
| 6626 | == NULL); |
| 6627 | } |
| 6628 | |
| 6629 | |
| 6630 | /* Assuming that VAR_TYPE is the type of a variant part of a record (a union), |
| 6631 | within a value of type OUTER_TYPE that is stored in GDB at |
| 6632 | OUTER_VALADDR, determine which variant clause (field number in VAR_TYPE, |
| 6633 | numbering from 0) is applicable. Returns -1 if none are. */ |
| 6634 | |
| 6635 | int |
| 6636 | ada_which_variant_applies (struct type *var_type, struct type *outer_type, |
| 6637 | const gdb_byte *outer_valaddr) |
| 6638 | { |
| 6639 | int others_clause; |
| 6640 | int i; |
| 6641 | char *discrim_name = ada_variant_discrim_name (var_type); |
| 6642 | struct value *outer; |
| 6643 | struct value *discrim; |
| 6644 | LONGEST discrim_val; |
| 6645 | |
| 6646 | outer = value_from_contents_and_address (outer_type, outer_valaddr, 0); |
| 6647 | discrim = ada_value_struct_elt (outer, discrim_name, 1); |
| 6648 | if (discrim == NULL) |
| 6649 | return -1; |
| 6650 | discrim_val = value_as_long (discrim); |
| 6651 | |
| 6652 | others_clause = -1; |
| 6653 | for (i = 0; i < TYPE_NFIELDS (var_type); i += 1) |
| 6654 | { |
| 6655 | if (ada_is_others_clause (var_type, i)) |
| 6656 | others_clause = i; |
| 6657 | else if (ada_in_variant (discrim_val, var_type, i)) |
| 6658 | return i; |
| 6659 | } |
| 6660 | |
| 6661 | return others_clause; |
| 6662 | } |
| 6663 | \f |
| 6664 | |
| 6665 | |
| 6666 | /* Dynamic-Sized Records */ |
| 6667 | |
| 6668 | /* Strategy: The type ostensibly attached to a value with dynamic size |
| 6669 | (i.e., a size that is not statically recorded in the debugging |
| 6670 | data) does not accurately reflect the size or layout of the value. |
| 6671 | Our strategy is to convert these values to values with accurate, |
| 6672 | conventional types that are constructed on the fly. */ |
| 6673 | |
| 6674 | /* There is a subtle and tricky problem here. In general, we cannot |
| 6675 | determine the size of dynamic records without its data. However, |
| 6676 | the 'struct value' data structure, which GDB uses to represent |
| 6677 | quantities in the inferior process (the target), requires the size |
| 6678 | of the type at the time of its allocation in order to reserve space |
| 6679 | for GDB's internal copy of the data. That's why the |
| 6680 | 'to_fixed_xxx_type' routines take (target) addresses as parameters, |
| 6681 | rather than struct value*s. |
| 6682 | |
| 6683 | However, GDB's internal history variables ($1, $2, etc.) are |
| 6684 | struct value*s containing internal copies of the data that are not, in |
| 6685 | general, the same as the data at their corresponding addresses in |
| 6686 | the target. Fortunately, the types we give to these values are all |
| 6687 | conventional, fixed-size types (as per the strategy described |
| 6688 | above), so that we don't usually have to perform the |
| 6689 | 'to_fixed_xxx_type' conversions to look at their values. |
| 6690 | Unfortunately, there is one exception: if one of the internal |
| 6691 | history variables is an array whose elements are unconstrained |
| 6692 | records, then we will need to create distinct fixed types for each |
| 6693 | element selected. */ |
| 6694 | |
| 6695 | /* The upshot of all of this is that many routines take a (type, host |
| 6696 | address, target address) triple as arguments to represent a value. |
| 6697 | The host address, if non-null, is supposed to contain an internal |
| 6698 | copy of the relevant data; otherwise, the program is to consult the |
| 6699 | target at the target address. */ |
| 6700 | |
| 6701 | /* Assuming that VAL0 represents a pointer value, the result of |
| 6702 | dereferencing it. Differs from value_ind in its treatment of |
| 6703 | dynamic-sized types. */ |
| 6704 | |
| 6705 | struct value * |
| 6706 | ada_value_ind (struct value *val0) |
| 6707 | { |
| 6708 | struct value *val = unwrap_value (value_ind (val0)); |
| 6709 | |
| 6710 | return ada_to_fixed_value (val); |
| 6711 | } |
| 6712 | |
| 6713 | /* The value resulting from dereferencing any "reference to" |
| 6714 | qualifiers on VAL0. */ |
| 6715 | |
| 6716 | static struct value * |
| 6717 | ada_coerce_ref (struct value *val0) |
| 6718 | { |
| 6719 | if (TYPE_CODE (value_type (val0)) == TYPE_CODE_REF) |
| 6720 | { |
| 6721 | struct value *val = val0; |
| 6722 | |
| 6723 | val = coerce_ref (val); |
| 6724 | val = unwrap_value (val); |
| 6725 | return ada_to_fixed_value (val); |
| 6726 | } |
| 6727 | else |
| 6728 | return val0; |
| 6729 | } |
| 6730 | |
| 6731 | /* Return OFF rounded upward if necessary to a multiple of |
| 6732 | ALIGNMENT (a power of 2). */ |
| 6733 | |
| 6734 | static unsigned int |
| 6735 | align_value (unsigned int off, unsigned int alignment) |
| 6736 | { |
| 6737 | return (off + alignment - 1) & ~(alignment - 1); |
| 6738 | } |
| 6739 | |
| 6740 | /* Return the bit alignment required for field #F of template type TYPE. */ |
| 6741 | |
| 6742 | static unsigned int |
| 6743 | field_alignment (struct type *type, int f) |
| 6744 | { |
| 6745 | const char *name = TYPE_FIELD_NAME (type, f); |
| 6746 | int len; |
| 6747 | int align_offset; |
| 6748 | |
| 6749 | /* The field name should never be null, unless the debugging information |
| 6750 | is somehow malformed. In this case, we assume the field does not |
| 6751 | require any alignment. */ |
| 6752 | if (name == NULL) |
| 6753 | return 1; |
| 6754 | |
| 6755 | len = strlen (name); |
| 6756 | |
| 6757 | if (!isdigit (name[len - 1])) |
| 6758 | return 1; |
| 6759 | |
| 6760 | if (isdigit (name[len - 2])) |
| 6761 | align_offset = len - 2; |
| 6762 | else |
| 6763 | align_offset = len - 1; |
| 6764 | |
| 6765 | if (align_offset < 7 || strncmp ("___XV", name + align_offset - 6, 5) != 0) |
| 6766 | return TARGET_CHAR_BIT; |
| 6767 | |
| 6768 | return atoi (name + align_offset) * TARGET_CHAR_BIT; |
| 6769 | } |
| 6770 | |
| 6771 | /* Find a symbol named NAME. Ignores ambiguity. */ |
| 6772 | |
| 6773 | struct symbol * |
| 6774 | ada_find_any_symbol (const char *name) |
| 6775 | { |
| 6776 | struct symbol *sym; |
| 6777 | |
| 6778 | sym = standard_lookup (name, get_selected_block (NULL), VAR_DOMAIN); |
| 6779 | if (sym != NULL && SYMBOL_CLASS (sym) == LOC_TYPEDEF) |
| 6780 | return sym; |
| 6781 | |
| 6782 | sym = standard_lookup (name, NULL, STRUCT_DOMAIN); |
| 6783 | return sym; |
| 6784 | } |
| 6785 | |
| 6786 | /* Find a type named NAME. Ignores ambiguity. This routine will look |
| 6787 | solely for types defined by debug info, it will not search the GDB |
| 6788 | primitive types. */ |
| 6789 | |
| 6790 | struct type * |
| 6791 | ada_find_any_type (const char *name) |
| 6792 | { |
| 6793 | struct symbol *sym = ada_find_any_symbol (name); |
| 6794 | |
| 6795 | if (sym != NULL) |
| 6796 | return SYMBOL_TYPE (sym); |
| 6797 | |
| 6798 | return NULL; |
| 6799 | } |
| 6800 | |
| 6801 | /* Given NAME and an associated BLOCK, search all symbols for |
| 6802 | NAME suffixed with "___XR", which is the ``renaming'' symbol |
| 6803 | associated to NAME. Return this symbol if found, return |
| 6804 | NULL otherwise. */ |
| 6805 | |
| 6806 | struct symbol * |
| 6807 | ada_find_renaming_symbol (const char *name, struct block *block) |
| 6808 | { |
| 6809 | struct symbol *sym; |
| 6810 | |
| 6811 | sym = find_old_style_renaming_symbol (name, block); |
| 6812 | |
| 6813 | if (sym != NULL) |
| 6814 | return sym; |
| 6815 | |
| 6816 | /* Not right yet. FIXME pnh 7/20/2007. */ |
| 6817 | sym = ada_find_any_symbol (name); |
| 6818 | if (sym != NULL && strstr (SYMBOL_LINKAGE_NAME (sym), "___XR") != NULL) |
| 6819 | return sym; |
| 6820 | else |
| 6821 | return NULL; |
| 6822 | } |
| 6823 | |
| 6824 | static struct symbol * |
| 6825 | find_old_style_renaming_symbol (const char *name, struct block *block) |
| 6826 | { |
| 6827 | const struct symbol *function_sym = block_linkage_function (block); |
| 6828 | char *rename; |
| 6829 | |
| 6830 | if (function_sym != NULL) |
| 6831 | { |
| 6832 | /* If the symbol is defined inside a function, NAME is not fully |
| 6833 | qualified. This means we need to prepend the function name |
| 6834 | as well as adding the ``___XR'' suffix to build the name of |
| 6835 | the associated renaming symbol. */ |
| 6836 | char *function_name = SYMBOL_LINKAGE_NAME (function_sym); |
| 6837 | /* Function names sometimes contain suffixes used |
| 6838 | for instance to qualify nested subprograms. When building |
| 6839 | the XR type name, we need to make sure that this suffix is |
| 6840 | not included. So do not include any suffix in the function |
| 6841 | name length below. */ |
| 6842 | int function_name_len = ada_name_prefix_len (function_name); |
| 6843 | const int rename_len = function_name_len + 2 /* "__" */ |
| 6844 | + strlen (name) + 6 /* "___XR\0" */ ; |
| 6845 | |
| 6846 | /* Strip the suffix if necessary. */ |
| 6847 | ada_remove_trailing_digits (function_name, &function_name_len); |
| 6848 | ada_remove_po_subprogram_suffix (function_name, &function_name_len); |
| 6849 | ada_remove_Xbn_suffix (function_name, &function_name_len); |
| 6850 | |
| 6851 | /* Library-level functions are a special case, as GNAT adds |
| 6852 | a ``_ada_'' prefix to the function name to avoid namespace |
| 6853 | pollution. However, the renaming symbols themselves do not |
| 6854 | have this prefix, so we need to skip this prefix if present. */ |
| 6855 | if (function_name_len > 5 /* "_ada_" */ |
| 6856 | && strstr (function_name, "_ada_") == function_name) |
| 6857 | { |
| 6858 | function_name += 5; |
| 6859 | function_name_len -= 5; |
| 6860 | } |
| 6861 | |
| 6862 | rename = (char *) alloca (rename_len * sizeof (char)); |
| 6863 | strncpy (rename, function_name, function_name_len); |
| 6864 | xsnprintf (rename + function_name_len, rename_len - function_name_len, |
| 6865 | "__%s___XR", name); |
| 6866 | } |
| 6867 | else |
| 6868 | { |
| 6869 | const int rename_len = strlen (name) + 6; |
| 6870 | |
| 6871 | rename = (char *) alloca (rename_len * sizeof (char)); |
| 6872 | xsnprintf (rename, rename_len * sizeof (char), "%s___XR", name); |
| 6873 | } |
| 6874 | |
| 6875 | return ada_find_any_symbol (rename); |
| 6876 | } |
| 6877 | |
| 6878 | /* Because of GNAT encoding conventions, several GDB symbols may match a |
| 6879 | given type name. If the type denoted by TYPE0 is to be preferred to |
| 6880 | that of TYPE1 for purposes of type printing, return non-zero; |
| 6881 | otherwise return 0. */ |
| 6882 | |
| 6883 | int |
| 6884 | ada_prefer_type (struct type *type0, struct type *type1) |
| 6885 | { |
| 6886 | if (type1 == NULL) |
| 6887 | return 1; |
| 6888 | else if (type0 == NULL) |
| 6889 | return 0; |
| 6890 | else if (TYPE_CODE (type1) == TYPE_CODE_VOID) |
| 6891 | return 1; |
| 6892 | else if (TYPE_CODE (type0) == TYPE_CODE_VOID) |
| 6893 | return 0; |
| 6894 | else if (TYPE_NAME (type1) == NULL && TYPE_NAME (type0) != NULL) |
| 6895 | return 1; |
| 6896 | else if (ada_is_constrained_packed_array_type (type0)) |
| 6897 | return 1; |
| 6898 | else if (ada_is_array_descriptor_type (type0) |
| 6899 | && !ada_is_array_descriptor_type (type1)) |
| 6900 | return 1; |
| 6901 | else |
| 6902 | { |
| 6903 | const char *type0_name = type_name_no_tag (type0); |
| 6904 | const char *type1_name = type_name_no_tag (type1); |
| 6905 | |
| 6906 | if (type0_name != NULL && strstr (type0_name, "___XR") != NULL |
| 6907 | && (type1_name == NULL || strstr (type1_name, "___XR") == NULL)) |
| 6908 | return 1; |
| 6909 | } |
| 6910 | return 0; |
| 6911 | } |
| 6912 | |
| 6913 | /* The name of TYPE, which is either its TYPE_NAME, or, if that is |
| 6914 | null, its TYPE_TAG_NAME. Null if TYPE is null. */ |
| 6915 | |
| 6916 | char * |
| 6917 | ada_type_name (struct type *type) |
| 6918 | { |
| 6919 | if (type == NULL) |
| 6920 | return NULL; |
| 6921 | else if (TYPE_NAME (type) != NULL) |
| 6922 | return TYPE_NAME (type); |
| 6923 | else |
| 6924 | return TYPE_TAG_NAME (type); |
| 6925 | } |
| 6926 | |
| 6927 | /* Search the list of "descriptive" types associated to TYPE for a type |
| 6928 | whose name is NAME. */ |
| 6929 | |
| 6930 | static struct type * |
| 6931 | find_parallel_type_by_descriptive_type (struct type *type, const char *name) |
| 6932 | { |
| 6933 | struct type *result; |
| 6934 | |
| 6935 | /* If there no descriptive-type info, then there is no parallel type |
| 6936 | to be found. */ |
| 6937 | if (!HAVE_GNAT_AUX_INFO (type)) |
| 6938 | return NULL; |
| 6939 | |
| 6940 | result = TYPE_DESCRIPTIVE_TYPE (type); |
| 6941 | while (result != NULL) |
| 6942 | { |
| 6943 | char *result_name = ada_type_name (result); |
| 6944 | |
| 6945 | if (result_name == NULL) |
| 6946 | { |
| 6947 | warning (_("unexpected null name on descriptive type")); |
| 6948 | return NULL; |
| 6949 | } |
| 6950 | |
| 6951 | /* If the names match, stop. */ |
| 6952 | if (strcmp (result_name, name) == 0) |
| 6953 | break; |
| 6954 | |
| 6955 | /* Otherwise, look at the next item on the list, if any. */ |
| 6956 | if (HAVE_GNAT_AUX_INFO (result)) |
| 6957 | result = TYPE_DESCRIPTIVE_TYPE (result); |
| 6958 | else |
| 6959 | result = NULL; |
| 6960 | } |
| 6961 | |
| 6962 | /* If we didn't find a match, see whether this is a packed array. With |
| 6963 | older compilers, the descriptive type information is either absent or |
| 6964 | irrelevant when it comes to packed arrays so the above lookup fails. |
| 6965 | Fall back to using a parallel lookup by name in this case. */ |
| 6966 | if (result == NULL && ada_is_constrained_packed_array_type (type)) |
| 6967 | return ada_find_any_type (name); |
| 6968 | |
| 6969 | return result; |
| 6970 | } |
| 6971 | |
| 6972 | /* Find a parallel type to TYPE with the specified NAME, using the |
| 6973 | descriptive type taken from the debugging information, if available, |
| 6974 | and otherwise using the (slower) name-based method. */ |
| 6975 | |
| 6976 | static struct type * |
| 6977 | ada_find_parallel_type_with_name (struct type *type, const char *name) |
| 6978 | { |
| 6979 | struct type *result = NULL; |
| 6980 | |
| 6981 | if (HAVE_GNAT_AUX_INFO (type)) |
| 6982 | result = find_parallel_type_by_descriptive_type (type, name); |
| 6983 | else |
| 6984 | result = ada_find_any_type (name); |
| 6985 | |
| 6986 | return result; |
| 6987 | } |
| 6988 | |
| 6989 | /* Same as above, but specify the name of the parallel type by appending |
| 6990 | SUFFIX to the name of TYPE. */ |
| 6991 | |
| 6992 | struct type * |
| 6993 | ada_find_parallel_type (struct type *type, const char *suffix) |
| 6994 | { |
| 6995 | char *name, *typename = ada_type_name (type); |
| 6996 | int len; |
| 6997 | |
| 6998 | if (typename == NULL) |
| 6999 | return NULL; |
| 7000 | |
| 7001 | len = strlen (typename); |
| 7002 | |
| 7003 | name = (char *) alloca (len + strlen (suffix) + 1); |
| 7004 | |
| 7005 | strcpy (name, typename); |
| 7006 | strcpy (name + len, suffix); |
| 7007 | |
| 7008 | return ada_find_parallel_type_with_name (type, name); |
| 7009 | } |
| 7010 | |
| 7011 | /* If TYPE is a variable-size record type, return the corresponding template |
| 7012 | type describing its fields. Otherwise, return NULL. */ |
| 7013 | |
| 7014 | static struct type * |
| 7015 | dynamic_template_type (struct type *type) |
| 7016 | { |
| 7017 | type = ada_check_typedef (type); |
| 7018 | |
| 7019 | if (type == NULL || TYPE_CODE (type) != TYPE_CODE_STRUCT |
| 7020 | || ada_type_name (type) == NULL) |
| 7021 | return NULL; |
| 7022 | else |
| 7023 | { |
| 7024 | int len = strlen (ada_type_name (type)); |
| 7025 | |
| 7026 | if (len > 6 && strcmp (ada_type_name (type) + len - 6, "___XVE") == 0) |
| 7027 | return type; |
| 7028 | else |
| 7029 | return ada_find_parallel_type (type, "___XVE"); |
| 7030 | } |
| 7031 | } |
| 7032 | |
| 7033 | /* Assuming that TEMPL_TYPE is a union or struct type, returns |
| 7034 | non-zero iff field FIELD_NUM of TEMPL_TYPE has dynamic size. */ |
| 7035 | |
| 7036 | static int |
| 7037 | is_dynamic_field (struct type *templ_type, int field_num) |
| 7038 | { |
| 7039 | const char *name = TYPE_FIELD_NAME (templ_type, field_num); |
| 7040 | |
| 7041 | return name != NULL |
| 7042 | && TYPE_CODE (TYPE_FIELD_TYPE (templ_type, field_num)) == TYPE_CODE_PTR |
| 7043 | && strstr (name, "___XVL") != NULL; |
| 7044 | } |
| 7045 | |
| 7046 | /* The index of the variant field of TYPE, or -1 if TYPE does not |
| 7047 | represent a variant record type. */ |
| 7048 | |
| 7049 | static int |
| 7050 | variant_field_index (struct type *type) |
| 7051 | { |
| 7052 | int f; |
| 7053 | |
| 7054 | if (type == NULL || TYPE_CODE (type) != TYPE_CODE_STRUCT) |
| 7055 | return -1; |
| 7056 | |
| 7057 | for (f = 0; f < TYPE_NFIELDS (type); f += 1) |
| 7058 | { |
| 7059 | if (ada_is_variant_part (type, f)) |
| 7060 | return f; |
| 7061 | } |
| 7062 | return -1; |
| 7063 | } |
| 7064 | |
| 7065 | /* A record type with no fields. */ |
| 7066 | |
| 7067 | static struct type * |
| 7068 | empty_record (struct type *template) |
| 7069 | { |
| 7070 | struct type *type = alloc_type_copy (template); |
| 7071 | |
| 7072 | TYPE_CODE (type) = TYPE_CODE_STRUCT; |
| 7073 | TYPE_NFIELDS (type) = 0; |
| 7074 | TYPE_FIELDS (type) = NULL; |
| 7075 | INIT_CPLUS_SPECIFIC (type); |
| 7076 | TYPE_NAME (type) = "<empty>"; |
| 7077 | TYPE_TAG_NAME (type) = NULL; |
| 7078 | TYPE_LENGTH (type) = 0; |
| 7079 | return type; |
| 7080 | } |
| 7081 | |
| 7082 | /* An ordinary record type (with fixed-length fields) that describes |
| 7083 | the value of type TYPE at VALADDR or ADDRESS (see comments at |
| 7084 | the beginning of this section) VAL according to GNAT conventions. |
| 7085 | DVAL0 should describe the (portion of a) record that contains any |
| 7086 | necessary discriminants. It should be NULL if value_type (VAL) is |
| 7087 | an outer-level type (i.e., as opposed to a branch of a variant.) A |
| 7088 | variant field (unless unchecked) is replaced by a particular branch |
| 7089 | of the variant. |
| 7090 | |
| 7091 | If not KEEP_DYNAMIC_FIELDS, then all fields whose position or |
| 7092 | length are not statically known are discarded. As a consequence, |
| 7093 | VALADDR, ADDRESS and DVAL0 are ignored. |
| 7094 | |
| 7095 | NOTE: Limitations: For now, we assume that dynamic fields and |
| 7096 | variants occupy whole numbers of bytes. However, they need not be |
| 7097 | byte-aligned. */ |
| 7098 | |
| 7099 | struct type * |
| 7100 | ada_template_to_fixed_record_type_1 (struct type *type, |
| 7101 | const gdb_byte *valaddr, |
| 7102 | CORE_ADDR address, struct value *dval0, |
| 7103 | int keep_dynamic_fields) |
| 7104 | { |
| 7105 | struct value *mark = value_mark (); |
| 7106 | struct value *dval; |
| 7107 | struct type *rtype; |
| 7108 | int nfields, bit_len; |
| 7109 | int variant_field; |
| 7110 | long off; |
| 7111 | int fld_bit_len; |
| 7112 | int f; |
| 7113 | |
| 7114 | /* Compute the number of fields in this record type that are going |
| 7115 | to be processed: unless keep_dynamic_fields, this includes only |
| 7116 | fields whose position and length are static will be processed. */ |
| 7117 | if (keep_dynamic_fields) |
| 7118 | nfields = TYPE_NFIELDS (type); |
| 7119 | else |
| 7120 | { |
| 7121 | nfields = 0; |
| 7122 | while (nfields < TYPE_NFIELDS (type) |
| 7123 | && !ada_is_variant_part (type, nfields) |
| 7124 | && !is_dynamic_field (type, nfields)) |
| 7125 | nfields++; |
| 7126 | } |
| 7127 | |
| 7128 | rtype = alloc_type_copy (type); |
| 7129 | TYPE_CODE (rtype) = TYPE_CODE_STRUCT; |
| 7130 | INIT_CPLUS_SPECIFIC (rtype); |
| 7131 | TYPE_NFIELDS (rtype) = nfields; |
| 7132 | TYPE_FIELDS (rtype) = (struct field *) |
| 7133 | TYPE_ALLOC (rtype, nfields * sizeof (struct field)); |
| 7134 | memset (TYPE_FIELDS (rtype), 0, sizeof (struct field) * nfields); |
| 7135 | TYPE_NAME (rtype) = ada_type_name (type); |
| 7136 | TYPE_TAG_NAME (rtype) = NULL; |
| 7137 | TYPE_FIXED_INSTANCE (rtype) = 1; |
| 7138 | |
| 7139 | off = 0; |
| 7140 | bit_len = 0; |
| 7141 | variant_field = -1; |
| 7142 | |
| 7143 | for (f = 0; f < nfields; f += 1) |
| 7144 | { |
| 7145 | off = align_value (off, field_alignment (type, f)) |
| 7146 | + TYPE_FIELD_BITPOS (type, f); |
| 7147 | TYPE_FIELD_BITPOS (rtype, f) = off; |
| 7148 | TYPE_FIELD_BITSIZE (rtype, f) = 0; |
| 7149 | |
| 7150 | if (ada_is_variant_part (type, f)) |
| 7151 | { |
| 7152 | variant_field = f; |
| 7153 | fld_bit_len = 0; |
| 7154 | } |
| 7155 | else if (is_dynamic_field (type, f)) |
| 7156 | { |
| 7157 | const gdb_byte *field_valaddr = valaddr; |
| 7158 | CORE_ADDR field_address = address; |
| 7159 | struct type *field_type = |
| 7160 | TYPE_TARGET_TYPE (TYPE_FIELD_TYPE (type, f)); |
| 7161 | |
| 7162 | if (dval0 == NULL) |
| 7163 | { |
| 7164 | /* rtype's length is computed based on the run-time |
| 7165 | value of discriminants. If the discriminants are not |
| 7166 | initialized, the type size may be completely bogus and |
| 7167 | GDB may fail to allocate a value for it. So check the |
| 7168 | size first before creating the value. */ |
| 7169 | check_size (rtype); |
| 7170 | dval = value_from_contents_and_address (rtype, valaddr, address); |
| 7171 | } |
| 7172 | else |
| 7173 | dval = dval0; |
| 7174 | |
| 7175 | /* If the type referenced by this field is an aligner type, we need |
| 7176 | to unwrap that aligner type, because its size might not be set. |
| 7177 | Keeping the aligner type would cause us to compute the wrong |
| 7178 | size for this field, impacting the offset of the all the fields |
| 7179 | that follow this one. */ |
| 7180 | if (ada_is_aligner_type (field_type)) |
| 7181 | { |
| 7182 | long field_offset = TYPE_FIELD_BITPOS (field_type, f); |
| 7183 | |
| 7184 | field_valaddr = cond_offset_host (field_valaddr, field_offset); |
| 7185 | field_address = cond_offset_target (field_address, field_offset); |
| 7186 | field_type = ada_aligned_type (field_type); |
| 7187 | } |
| 7188 | |
| 7189 | field_valaddr = cond_offset_host (field_valaddr, |
| 7190 | off / TARGET_CHAR_BIT); |
| 7191 | field_address = cond_offset_target (field_address, |
| 7192 | off / TARGET_CHAR_BIT); |
| 7193 | |
| 7194 | /* Get the fixed type of the field. Note that, in this case, |
| 7195 | we do not want to get the real type out of the tag: if |
| 7196 | the current field is the parent part of a tagged record, |
| 7197 | we will get the tag of the object. Clearly wrong: the real |
| 7198 | type of the parent is not the real type of the child. We |
| 7199 | would end up in an infinite loop. */ |
| 7200 | field_type = ada_get_base_type (field_type); |
| 7201 | field_type = ada_to_fixed_type (field_type, field_valaddr, |
| 7202 | field_address, dval, 0); |
| 7203 | /* If the field size is already larger than the maximum |
| 7204 | object size, then the record itself will necessarily |
| 7205 | be larger than the maximum object size. We need to make |
| 7206 | this check now, because the size might be so ridiculously |
| 7207 | large (due to an uninitialized variable in the inferior) |
| 7208 | that it would cause an overflow when adding it to the |
| 7209 | record size. */ |
| 7210 | check_size (field_type); |
| 7211 | |
| 7212 | TYPE_FIELD_TYPE (rtype, f) = field_type; |
| 7213 | TYPE_FIELD_NAME (rtype, f) = TYPE_FIELD_NAME (type, f); |
| 7214 | /* The multiplication can potentially overflow. But because |
| 7215 | the field length has been size-checked just above, and |
| 7216 | assuming that the maximum size is a reasonable value, |
| 7217 | an overflow should not happen in practice. So rather than |
| 7218 | adding overflow recovery code to this already complex code, |
| 7219 | we just assume that it's not going to happen. */ |
| 7220 | fld_bit_len = |
| 7221 | TYPE_LENGTH (TYPE_FIELD_TYPE (rtype, f)) * TARGET_CHAR_BIT; |
| 7222 | } |
| 7223 | else |
| 7224 | { |
| 7225 | struct type *field_type = TYPE_FIELD_TYPE (type, f); |
| 7226 | |
| 7227 | /* If our field is a typedef type (most likely a typedef of |
| 7228 | a fat pointer, encoding an array access), then we need to |
| 7229 | look at its target type to determine its characteristics. |
| 7230 | In particular, we would miscompute the field size if we took |
| 7231 | the size of the typedef (zero), instead of the size of |
| 7232 | the target type. */ |
| 7233 | if (TYPE_CODE (field_type) == TYPE_CODE_TYPEDEF) |
| 7234 | field_type = ada_typedef_target_type (field_type); |
| 7235 | |
| 7236 | TYPE_FIELD_TYPE (rtype, f) = field_type; |
| 7237 | TYPE_FIELD_NAME (rtype, f) = TYPE_FIELD_NAME (type, f); |
| 7238 | if (TYPE_FIELD_BITSIZE (type, f) > 0) |
| 7239 | fld_bit_len = |
| 7240 | TYPE_FIELD_BITSIZE (rtype, f) = TYPE_FIELD_BITSIZE (type, f); |
| 7241 | else |
| 7242 | fld_bit_len = |
| 7243 | TYPE_LENGTH (ada_check_typedef (field_type)) * TARGET_CHAR_BIT; |
| 7244 | } |
| 7245 | if (off + fld_bit_len > bit_len) |
| 7246 | bit_len = off + fld_bit_len; |
| 7247 | off += fld_bit_len; |
| 7248 | TYPE_LENGTH (rtype) = |
| 7249 | align_value (bit_len, TARGET_CHAR_BIT) / TARGET_CHAR_BIT; |
| 7250 | } |
| 7251 | |
| 7252 | /* We handle the variant part, if any, at the end because of certain |
| 7253 | odd cases in which it is re-ordered so as NOT to be the last field of |
| 7254 | the record. This can happen in the presence of representation |
| 7255 | clauses. */ |
| 7256 | if (variant_field >= 0) |
| 7257 | { |
| 7258 | struct type *branch_type; |
| 7259 | |
| 7260 | off = TYPE_FIELD_BITPOS (rtype, variant_field); |
| 7261 | |
| 7262 | if (dval0 == NULL) |
| 7263 | dval = value_from_contents_and_address (rtype, valaddr, address); |
| 7264 | else |
| 7265 | dval = dval0; |
| 7266 | |
| 7267 | branch_type = |
| 7268 | to_fixed_variant_branch_type |
| 7269 | (TYPE_FIELD_TYPE (type, variant_field), |
| 7270 | cond_offset_host (valaddr, off / TARGET_CHAR_BIT), |
| 7271 | cond_offset_target (address, off / TARGET_CHAR_BIT), dval); |
| 7272 | if (branch_type == NULL) |
| 7273 | { |
| 7274 | for (f = variant_field + 1; f < TYPE_NFIELDS (rtype); f += 1) |
| 7275 | TYPE_FIELDS (rtype)[f - 1] = TYPE_FIELDS (rtype)[f]; |
| 7276 | TYPE_NFIELDS (rtype) -= 1; |
| 7277 | } |
| 7278 | else |
| 7279 | { |
| 7280 | TYPE_FIELD_TYPE (rtype, variant_field) = branch_type; |
| 7281 | TYPE_FIELD_NAME (rtype, variant_field) = "S"; |
| 7282 | fld_bit_len = |
| 7283 | TYPE_LENGTH (TYPE_FIELD_TYPE (rtype, variant_field)) * |
| 7284 | TARGET_CHAR_BIT; |
| 7285 | if (off + fld_bit_len > bit_len) |
| 7286 | bit_len = off + fld_bit_len; |
| 7287 | TYPE_LENGTH (rtype) = |
| 7288 | align_value (bit_len, TARGET_CHAR_BIT) / TARGET_CHAR_BIT; |
| 7289 | } |
| 7290 | } |
| 7291 | |
| 7292 | /* According to exp_dbug.ads, the size of TYPE for variable-size records |
| 7293 | should contain the alignment of that record, which should be a strictly |
| 7294 | positive value. If null or negative, then something is wrong, most |
| 7295 | probably in the debug info. In that case, we don't round up the size |
| 7296 | of the resulting type. If this record is not part of another structure, |
| 7297 | the current RTYPE length might be good enough for our purposes. */ |
| 7298 | if (TYPE_LENGTH (type) <= 0) |
| 7299 | { |
| 7300 | if (TYPE_NAME (rtype)) |
| 7301 | warning (_("Invalid type size for `%s' detected: %d."), |
| 7302 | TYPE_NAME (rtype), TYPE_LENGTH (type)); |
| 7303 | else |
| 7304 | warning (_("Invalid type size for <unnamed> detected: %d."), |
| 7305 | TYPE_LENGTH (type)); |
| 7306 | } |
| 7307 | else |
| 7308 | { |
| 7309 | TYPE_LENGTH (rtype) = align_value (TYPE_LENGTH (rtype), |
| 7310 | TYPE_LENGTH (type)); |
| 7311 | } |
| 7312 | |
| 7313 | value_free_to_mark (mark); |
| 7314 | if (TYPE_LENGTH (rtype) > varsize_limit) |
| 7315 | error (_("record type with dynamic size is larger than varsize-limit")); |
| 7316 | return rtype; |
| 7317 | } |
| 7318 | |
| 7319 | /* As for ada_template_to_fixed_record_type_1 with KEEP_DYNAMIC_FIELDS |
| 7320 | of 1. */ |
| 7321 | |
| 7322 | static struct type * |
| 7323 | template_to_fixed_record_type (struct type *type, const gdb_byte *valaddr, |
| 7324 | CORE_ADDR address, struct value *dval0) |
| 7325 | { |
| 7326 | return ada_template_to_fixed_record_type_1 (type, valaddr, |
| 7327 | address, dval0, 1); |
| 7328 | } |
| 7329 | |
| 7330 | /* An ordinary record type in which ___XVL-convention fields and |
| 7331 | ___XVU- and ___XVN-convention field types in TYPE0 are replaced with |
| 7332 | static approximations, containing all possible fields. Uses |
| 7333 | no runtime values. Useless for use in values, but that's OK, |
| 7334 | since the results are used only for type determinations. Works on both |
| 7335 | structs and unions. Representation note: to save space, we memorize |
| 7336 | the result of this function in the TYPE_TARGET_TYPE of the |
| 7337 | template type. */ |
| 7338 | |
| 7339 | static struct type * |
| 7340 | template_to_static_fixed_type (struct type *type0) |
| 7341 | { |
| 7342 | struct type *type; |
| 7343 | int nfields; |
| 7344 | int f; |
| 7345 | |
| 7346 | if (TYPE_TARGET_TYPE (type0) != NULL) |
| 7347 | return TYPE_TARGET_TYPE (type0); |
| 7348 | |
| 7349 | nfields = TYPE_NFIELDS (type0); |
| 7350 | type = type0; |
| 7351 | |
| 7352 | for (f = 0; f < nfields; f += 1) |
| 7353 | { |
| 7354 | struct type *field_type = ada_check_typedef (TYPE_FIELD_TYPE (type0, f)); |
| 7355 | struct type *new_type; |
| 7356 | |
| 7357 | if (is_dynamic_field (type0, f)) |
| 7358 | new_type = to_static_fixed_type (TYPE_TARGET_TYPE (field_type)); |
| 7359 | else |
| 7360 | new_type = static_unwrap_type (field_type); |
| 7361 | if (type == type0 && new_type != field_type) |
| 7362 | { |
| 7363 | TYPE_TARGET_TYPE (type0) = type = alloc_type_copy (type0); |
| 7364 | TYPE_CODE (type) = TYPE_CODE (type0); |
| 7365 | INIT_CPLUS_SPECIFIC (type); |
| 7366 | TYPE_NFIELDS (type) = nfields; |
| 7367 | TYPE_FIELDS (type) = (struct field *) |
| 7368 | TYPE_ALLOC (type, nfields * sizeof (struct field)); |
| 7369 | memcpy (TYPE_FIELDS (type), TYPE_FIELDS (type0), |
| 7370 | sizeof (struct field) * nfields); |
| 7371 | TYPE_NAME (type) = ada_type_name (type0); |
| 7372 | TYPE_TAG_NAME (type) = NULL; |
| 7373 | TYPE_FIXED_INSTANCE (type) = 1; |
| 7374 | TYPE_LENGTH (type) = 0; |
| 7375 | } |
| 7376 | TYPE_FIELD_TYPE (type, f) = new_type; |
| 7377 | TYPE_FIELD_NAME (type, f) = TYPE_FIELD_NAME (type0, f); |
| 7378 | } |
| 7379 | return type; |
| 7380 | } |
| 7381 | |
| 7382 | /* Given an object of type TYPE whose contents are at VALADDR and |
| 7383 | whose address in memory is ADDRESS, returns a revision of TYPE, |
| 7384 | which should be a non-dynamic-sized record, in which the variant |
| 7385 | part, if any, is replaced with the appropriate branch. Looks |
| 7386 | for discriminant values in DVAL0, which can be NULL if the record |
| 7387 | contains the necessary discriminant values. */ |
| 7388 | |
| 7389 | static struct type * |
| 7390 | to_record_with_fixed_variant_part (struct type *type, const gdb_byte *valaddr, |
| 7391 | CORE_ADDR address, struct value *dval0) |
| 7392 | { |
| 7393 | struct value *mark = value_mark (); |
| 7394 | struct value *dval; |
| 7395 | struct type *rtype; |
| 7396 | struct type *branch_type; |
| 7397 | int nfields = TYPE_NFIELDS (type); |
| 7398 | int variant_field = variant_field_index (type); |
| 7399 | |
| 7400 | if (variant_field == -1) |
| 7401 | return type; |
| 7402 | |
| 7403 | if (dval0 == NULL) |
| 7404 | dval = value_from_contents_and_address (type, valaddr, address); |
| 7405 | else |
| 7406 | dval = dval0; |
| 7407 | |
| 7408 | rtype = alloc_type_copy (type); |
| 7409 | TYPE_CODE (rtype) = TYPE_CODE_STRUCT; |
| 7410 | INIT_CPLUS_SPECIFIC (rtype); |
| 7411 | TYPE_NFIELDS (rtype) = nfields; |
| 7412 | TYPE_FIELDS (rtype) = |
| 7413 | (struct field *) TYPE_ALLOC (rtype, nfields * sizeof (struct field)); |
| 7414 | memcpy (TYPE_FIELDS (rtype), TYPE_FIELDS (type), |
| 7415 | sizeof (struct field) * nfields); |
| 7416 | TYPE_NAME (rtype) = ada_type_name (type); |
| 7417 | TYPE_TAG_NAME (rtype) = NULL; |
| 7418 | TYPE_FIXED_INSTANCE (rtype) = 1; |
| 7419 | TYPE_LENGTH (rtype) = TYPE_LENGTH (type); |
| 7420 | |
| 7421 | branch_type = to_fixed_variant_branch_type |
| 7422 | (TYPE_FIELD_TYPE (type, variant_field), |
| 7423 | cond_offset_host (valaddr, |
| 7424 | TYPE_FIELD_BITPOS (type, variant_field) |
| 7425 | / TARGET_CHAR_BIT), |
| 7426 | cond_offset_target (address, |
| 7427 | TYPE_FIELD_BITPOS (type, variant_field) |
| 7428 | / TARGET_CHAR_BIT), dval); |
| 7429 | if (branch_type == NULL) |
| 7430 | { |
| 7431 | int f; |
| 7432 | |
| 7433 | for (f = variant_field + 1; f < nfields; f += 1) |
| 7434 | TYPE_FIELDS (rtype)[f - 1] = TYPE_FIELDS (rtype)[f]; |
| 7435 | TYPE_NFIELDS (rtype) -= 1; |
| 7436 | } |
| 7437 | else |
| 7438 | { |
| 7439 | TYPE_FIELD_TYPE (rtype, variant_field) = branch_type; |
| 7440 | TYPE_FIELD_NAME (rtype, variant_field) = "S"; |
| 7441 | TYPE_FIELD_BITSIZE (rtype, variant_field) = 0; |
| 7442 | TYPE_LENGTH (rtype) += TYPE_LENGTH (branch_type); |
| 7443 | } |
| 7444 | TYPE_LENGTH (rtype) -= TYPE_LENGTH (TYPE_FIELD_TYPE (type, variant_field)); |
| 7445 | |
| 7446 | value_free_to_mark (mark); |
| 7447 | return rtype; |
| 7448 | } |
| 7449 | |
| 7450 | /* An ordinary record type (with fixed-length fields) that describes |
| 7451 | the value at (TYPE0, VALADDR, ADDRESS) [see explanation at |
| 7452 | beginning of this section]. Any necessary discriminants' values |
| 7453 | should be in DVAL, a record value; it may be NULL if the object |
| 7454 | at ADDR itself contains any necessary discriminant values. |
| 7455 | Additionally, VALADDR and ADDRESS may also be NULL if no discriminant |
| 7456 | values from the record are needed. Except in the case that DVAL, |
| 7457 | VALADDR, and ADDRESS are all 0 or NULL, a variant field (unless |
| 7458 | unchecked) is replaced by a particular branch of the variant. |
| 7459 | |
| 7460 | NOTE: the case in which DVAL and VALADDR are NULL and ADDRESS is 0 |
| 7461 | is questionable and may be removed. It can arise during the |
| 7462 | processing of an unconstrained-array-of-record type where all the |
| 7463 | variant branches have exactly the same size. This is because in |
| 7464 | such cases, the compiler does not bother to use the XVS convention |
| 7465 | when encoding the record. I am currently dubious of this |
| 7466 | shortcut and suspect the compiler should be altered. FIXME. */ |
| 7467 | |
| 7468 | static struct type * |
| 7469 | to_fixed_record_type (struct type *type0, const gdb_byte *valaddr, |
| 7470 | CORE_ADDR address, struct value *dval) |
| 7471 | { |
| 7472 | struct type *templ_type; |
| 7473 | |
| 7474 | if (TYPE_FIXED_INSTANCE (type0)) |
| 7475 | return type0; |
| 7476 | |
| 7477 | templ_type = dynamic_template_type (type0); |
| 7478 | |
| 7479 | if (templ_type != NULL) |
| 7480 | return template_to_fixed_record_type (templ_type, valaddr, address, dval); |
| 7481 | else if (variant_field_index (type0) >= 0) |
| 7482 | { |
| 7483 | if (dval == NULL && valaddr == NULL && address == 0) |
| 7484 | return type0; |
| 7485 | return to_record_with_fixed_variant_part (type0, valaddr, address, |
| 7486 | dval); |
| 7487 | } |
| 7488 | else |
| 7489 | { |
| 7490 | TYPE_FIXED_INSTANCE (type0) = 1; |
| 7491 | return type0; |
| 7492 | } |
| 7493 | |
| 7494 | } |
| 7495 | |
| 7496 | /* An ordinary record type (with fixed-length fields) that describes |
| 7497 | the value at (VAR_TYPE0, VALADDR, ADDRESS), where VAR_TYPE0 is a |
| 7498 | union type. Any necessary discriminants' values should be in DVAL, |
| 7499 | a record value. That is, this routine selects the appropriate |
| 7500 | branch of the union at ADDR according to the discriminant value |
| 7501 | indicated in the union's type name. Returns VAR_TYPE0 itself if |
| 7502 | it represents a variant subject to a pragma Unchecked_Union. */ |
| 7503 | |
| 7504 | static struct type * |
| 7505 | to_fixed_variant_branch_type (struct type *var_type0, const gdb_byte *valaddr, |
| 7506 | CORE_ADDR address, struct value *dval) |
| 7507 | { |
| 7508 | int which; |
| 7509 | struct type *templ_type; |
| 7510 | struct type *var_type; |
| 7511 | |
| 7512 | if (TYPE_CODE (var_type0) == TYPE_CODE_PTR) |
| 7513 | var_type = TYPE_TARGET_TYPE (var_type0); |
| 7514 | else |
| 7515 | var_type = var_type0; |
| 7516 | |
| 7517 | templ_type = ada_find_parallel_type (var_type, "___XVU"); |
| 7518 | |
| 7519 | if (templ_type != NULL) |
| 7520 | var_type = templ_type; |
| 7521 | |
| 7522 | if (is_unchecked_variant (var_type, value_type (dval))) |
| 7523 | return var_type0; |
| 7524 | which = |
| 7525 | ada_which_variant_applies (var_type, |
| 7526 | value_type (dval), value_contents (dval)); |
| 7527 | |
| 7528 | if (which < 0) |
| 7529 | return empty_record (var_type); |
| 7530 | else if (is_dynamic_field (var_type, which)) |
| 7531 | return to_fixed_record_type |
| 7532 | (TYPE_TARGET_TYPE (TYPE_FIELD_TYPE (var_type, which)), |
| 7533 | valaddr, address, dval); |
| 7534 | else if (variant_field_index (TYPE_FIELD_TYPE (var_type, which)) >= 0) |
| 7535 | return |
| 7536 | to_fixed_record_type |
| 7537 | (TYPE_FIELD_TYPE (var_type, which), valaddr, address, dval); |
| 7538 | else |
| 7539 | return TYPE_FIELD_TYPE (var_type, which); |
| 7540 | } |
| 7541 | |
| 7542 | /* Assuming that TYPE0 is an array type describing the type of a value |
| 7543 | at ADDR, and that DVAL describes a record containing any |
| 7544 | discriminants used in TYPE0, returns a type for the value that |
| 7545 | contains no dynamic components (that is, no components whose sizes |
| 7546 | are determined by run-time quantities). Unless IGNORE_TOO_BIG is |
| 7547 | true, gives an error message if the resulting type's size is over |
| 7548 | varsize_limit. */ |
| 7549 | |
| 7550 | static struct type * |
| 7551 | to_fixed_array_type (struct type *type0, struct value *dval, |
| 7552 | int ignore_too_big) |
| 7553 | { |
| 7554 | struct type *index_type_desc; |
| 7555 | struct type *result; |
| 7556 | int constrained_packed_array_p; |
| 7557 | |
| 7558 | type0 = ada_check_typedef (type0); |
| 7559 | if (TYPE_FIXED_INSTANCE (type0)) |
| 7560 | return type0; |
| 7561 | |
| 7562 | constrained_packed_array_p = ada_is_constrained_packed_array_type (type0); |
| 7563 | if (constrained_packed_array_p) |
| 7564 | type0 = decode_constrained_packed_array_type (type0); |
| 7565 | |
| 7566 | index_type_desc = ada_find_parallel_type (type0, "___XA"); |
| 7567 | ada_fixup_array_indexes_type (index_type_desc); |
| 7568 | if (index_type_desc == NULL) |
| 7569 | { |
| 7570 | struct type *elt_type0 = ada_check_typedef (TYPE_TARGET_TYPE (type0)); |
| 7571 | |
| 7572 | /* NOTE: elt_type---the fixed version of elt_type0---should never |
| 7573 | depend on the contents of the array in properly constructed |
| 7574 | debugging data. */ |
| 7575 | /* Create a fixed version of the array element type. |
| 7576 | We're not providing the address of an element here, |
| 7577 | and thus the actual object value cannot be inspected to do |
| 7578 | the conversion. This should not be a problem, since arrays of |
| 7579 | unconstrained objects are not allowed. In particular, all |
| 7580 | the elements of an array of a tagged type should all be of |
| 7581 | the same type specified in the debugging info. No need to |
| 7582 | consult the object tag. */ |
| 7583 | struct type *elt_type = ada_to_fixed_type (elt_type0, 0, 0, dval, 1); |
| 7584 | |
| 7585 | /* Make sure we always create a new array type when dealing with |
| 7586 | packed array types, since we're going to fix-up the array |
| 7587 | type length and element bitsize a little further down. */ |
| 7588 | if (elt_type0 == elt_type && !constrained_packed_array_p) |
| 7589 | result = type0; |
| 7590 | else |
| 7591 | result = create_array_type (alloc_type_copy (type0), |
| 7592 | elt_type, TYPE_INDEX_TYPE (type0)); |
| 7593 | } |
| 7594 | else |
| 7595 | { |
| 7596 | int i; |
| 7597 | struct type *elt_type0; |
| 7598 | |
| 7599 | elt_type0 = type0; |
| 7600 | for (i = TYPE_NFIELDS (index_type_desc); i > 0; i -= 1) |
| 7601 | elt_type0 = TYPE_TARGET_TYPE (elt_type0); |
| 7602 | |
| 7603 | /* NOTE: result---the fixed version of elt_type0---should never |
| 7604 | depend on the contents of the array in properly constructed |
| 7605 | debugging data. */ |
| 7606 | /* Create a fixed version of the array element type. |
| 7607 | We're not providing the address of an element here, |
| 7608 | and thus the actual object value cannot be inspected to do |
| 7609 | the conversion. This should not be a problem, since arrays of |
| 7610 | unconstrained objects are not allowed. In particular, all |
| 7611 | the elements of an array of a tagged type should all be of |
| 7612 | the same type specified in the debugging info. No need to |
| 7613 | consult the object tag. */ |
| 7614 | result = |
| 7615 | ada_to_fixed_type (ada_check_typedef (elt_type0), 0, 0, dval, 1); |
| 7616 | |
| 7617 | elt_type0 = type0; |
| 7618 | for (i = TYPE_NFIELDS (index_type_desc) - 1; i >= 0; i -= 1) |
| 7619 | { |
| 7620 | struct type *range_type = |
| 7621 | to_fixed_range_type (TYPE_FIELD_TYPE (index_type_desc, i), dval); |
| 7622 | |
| 7623 | result = create_array_type (alloc_type_copy (elt_type0), |
| 7624 | result, range_type); |
| 7625 | elt_type0 = TYPE_TARGET_TYPE (elt_type0); |
| 7626 | } |
| 7627 | if (!ignore_too_big && TYPE_LENGTH (result) > varsize_limit) |
| 7628 | error (_("array type with dynamic size is larger than varsize-limit")); |
| 7629 | } |
| 7630 | |
| 7631 | if (constrained_packed_array_p) |
| 7632 | { |
| 7633 | /* So far, the resulting type has been created as if the original |
| 7634 | type was a regular (non-packed) array type. As a result, the |
| 7635 | bitsize of the array elements needs to be set again, and the array |
| 7636 | length needs to be recomputed based on that bitsize. */ |
| 7637 | int len = TYPE_LENGTH (result) / TYPE_LENGTH (TYPE_TARGET_TYPE (result)); |
| 7638 | int elt_bitsize = TYPE_FIELD_BITSIZE (type0, 0); |
| 7639 | |
| 7640 | TYPE_FIELD_BITSIZE (result, 0) = TYPE_FIELD_BITSIZE (type0, 0); |
| 7641 | TYPE_LENGTH (result) = len * elt_bitsize / HOST_CHAR_BIT; |
| 7642 | if (TYPE_LENGTH (result) * HOST_CHAR_BIT < len * elt_bitsize) |
| 7643 | TYPE_LENGTH (result)++; |
| 7644 | } |
| 7645 | |
| 7646 | TYPE_FIXED_INSTANCE (result) = 1; |
| 7647 | return result; |
| 7648 | } |
| 7649 | |
| 7650 | |
| 7651 | /* A standard type (containing no dynamically sized components) |
| 7652 | corresponding to TYPE for the value (TYPE, VALADDR, ADDRESS) |
| 7653 | DVAL describes a record containing any discriminants used in TYPE0, |
| 7654 | and may be NULL if there are none, or if the object of type TYPE at |
| 7655 | ADDRESS or in VALADDR contains these discriminants. |
| 7656 | |
| 7657 | If CHECK_TAG is not null, in the case of tagged types, this function |
| 7658 | attempts to locate the object's tag and use it to compute the actual |
| 7659 | type. However, when ADDRESS is null, we cannot use it to determine the |
| 7660 | location of the tag, and therefore compute the tagged type's actual type. |
| 7661 | So we return the tagged type without consulting the tag. */ |
| 7662 | |
| 7663 | static struct type * |
| 7664 | ada_to_fixed_type_1 (struct type *type, const gdb_byte *valaddr, |
| 7665 | CORE_ADDR address, struct value *dval, int check_tag) |
| 7666 | { |
| 7667 | type = ada_check_typedef (type); |
| 7668 | switch (TYPE_CODE (type)) |
| 7669 | { |
| 7670 | default: |
| 7671 | return type; |
| 7672 | case TYPE_CODE_STRUCT: |
| 7673 | { |
| 7674 | struct type *static_type = to_static_fixed_type (type); |
| 7675 | struct type *fixed_record_type = |
| 7676 | to_fixed_record_type (type, valaddr, address, NULL); |
| 7677 | |
| 7678 | /* If STATIC_TYPE is a tagged type and we know the object's address, |
| 7679 | then we can determine its tag, and compute the object's actual |
| 7680 | type from there. Note that we have to use the fixed record |
| 7681 | type (the parent part of the record may have dynamic fields |
| 7682 | and the way the location of _tag is expressed may depend on |
| 7683 | them). */ |
| 7684 | |
| 7685 | if (check_tag && address != 0 && ada_is_tagged_type (static_type, 0)) |
| 7686 | { |
| 7687 | struct type *real_type = |
| 7688 | type_from_tag (value_tag_from_contents_and_address |
| 7689 | (fixed_record_type, |
| 7690 | valaddr, |
| 7691 | address)); |
| 7692 | |
| 7693 | if (real_type != NULL) |
| 7694 | return to_fixed_record_type (real_type, valaddr, address, NULL); |
| 7695 | } |
| 7696 | |
| 7697 | /* Check to see if there is a parallel ___XVZ variable. |
| 7698 | If there is, then it provides the actual size of our type. */ |
| 7699 | else if (ada_type_name (fixed_record_type) != NULL) |
| 7700 | { |
| 7701 | char *name = ada_type_name (fixed_record_type); |
| 7702 | char *xvz_name = alloca (strlen (name) + 7 /* "___XVZ\0" */); |
| 7703 | int xvz_found = 0; |
| 7704 | LONGEST size; |
| 7705 | |
| 7706 | xsnprintf (xvz_name, strlen (name) + 7, "%s___XVZ", name); |
| 7707 | size = get_int_var_value (xvz_name, &xvz_found); |
| 7708 | if (xvz_found && TYPE_LENGTH (fixed_record_type) != size) |
| 7709 | { |
| 7710 | fixed_record_type = copy_type (fixed_record_type); |
| 7711 | TYPE_LENGTH (fixed_record_type) = size; |
| 7712 | |
| 7713 | /* The FIXED_RECORD_TYPE may have be a stub. We have |
| 7714 | observed this when the debugging info is STABS, and |
| 7715 | apparently it is something that is hard to fix. |
| 7716 | |
| 7717 | In practice, we don't need the actual type definition |
| 7718 | at all, because the presence of the XVZ variable allows us |
| 7719 | to assume that there must be a XVS type as well, which we |
| 7720 | should be able to use later, when we need the actual type |
| 7721 | definition. |
| 7722 | |
| 7723 | In the meantime, pretend that the "fixed" type we are |
| 7724 | returning is NOT a stub, because this can cause trouble |
| 7725 | when using this type to create new types targeting it. |
| 7726 | Indeed, the associated creation routines often check |
| 7727 | whether the target type is a stub and will try to replace |
| 7728 | it, thus using a type with the wrong size. This, in turn, |
| 7729 | might cause the new type to have the wrong size too. |
| 7730 | Consider the case of an array, for instance, where the size |
| 7731 | of the array is computed from the number of elements in |
| 7732 | our array multiplied by the size of its element. */ |
| 7733 | TYPE_STUB (fixed_record_type) = 0; |
| 7734 | } |
| 7735 | } |
| 7736 | return fixed_record_type; |
| 7737 | } |
| 7738 | case TYPE_CODE_ARRAY: |
| 7739 | return to_fixed_array_type (type, dval, 1); |
| 7740 | case TYPE_CODE_UNION: |
| 7741 | if (dval == NULL) |
| 7742 | return type; |
| 7743 | else |
| 7744 | return to_fixed_variant_branch_type (type, valaddr, address, dval); |
| 7745 | } |
| 7746 | } |
| 7747 | |
| 7748 | /* The same as ada_to_fixed_type_1, except that it preserves the type |
| 7749 | if it is a TYPE_CODE_TYPEDEF of a type that is already fixed. |
| 7750 | |
| 7751 | The typedef layer needs be preserved in order to differentiate between |
| 7752 | arrays and array pointers when both types are implemented using the same |
| 7753 | fat pointer. In the array pointer case, the pointer is encoded as |
| 7754 | a typedef of the pointer type. For instance, considering: |
| 7755 | |
| 7756 | type String_Access is access String; |
| 7757 | S1 : String_Access := null; |
| 7758 | |
| 7759 | To the debugger, S1 is defined as a typedef of type String. But |
| 7760 | to the user, it is a pointer. So if the user tries to print S1, |
| 7761 | we should not dereference the array, but print the array address |
| 7762 | instead. |
| 7763 | |
| 7764 | If we didn't preserve the typedef layer, we would lose the fact that |
| 7765 | the type is to be presented as a pointer (needs de-reference before |
| 7766 | being printed). And we would also use the source-level type name. */ |
| 7767 | |
| 7768 | struct type * |
| 7769 | ada_to_fixed_type (struct type *type, const gdb_byte *valaddr, |
| 7770 | CORE_ADDR address, struct value *dval, int check_tag) |
| 7771 | |
| 7772 | { |
| 7773 | struct type *fixed_type = |
| 7774 | ada_to_fixed_type_1 (type, valaddr, address, dval, check_tag); |
| 7775 | |
| 7776 | /* If TYPE is a typedef and its target type is the same as the FIXED_TYPE, |
| 7777 | then preserve the typedef layer. |
| 7778 | |
| 7779 | Implementation note: We can only check the main-type portion of |
| 7780 | the TYPE and FIXED_TYPE, because eliminating the typedef layer |
| 7781 | from TYPE now returns a type that has the same instance flags |
| 7782 | as TYPE. For instance, if TYPE is a "typedef const", and its |
| 7783 | target type is a "struct", then the typedef elimination will return |
| 7784 | a "const" version of the target type. See check_typedef for more |
| 7785 | details about how the typedef layer elimination is done. |
| 7786 | |
| 7787 | brobecker/2010-11-19: It seems to me that the only case where it is |
| 7788 | useful to preserve the typedef layer is when dealing with fat pointers. |
| 7789 | Perhaps, we could add a check for that and preserve the typedef layer |
| 7790 | only in that situation. But this seems unecessary so far, probably |
| 7791 | because we call check_typedef/ada_check_typedef pretty much everywhere. |
| 7792 | */ |
| 7793 | if (TYPE_CODE (type) == TYPE_CODE_TYPEDEF |
| 7794 | && (TYPE_MAIN_TYPE (ada_typedef_target_type (type)) |
| 7795 | == TYPE_MAIN_TYPE (fixed_type))) |
| 7796 | return type; |
| 7797 | |
| 7798 | return fixed_type; |
| 7799 | } |
| 7800 | |
| 7801 | /* A standard (static-sized) type corresponding as well as possible to |
| 7802 | TYPE0, but based on no runtime data. */ |
| 7803 | |
| 7804 | static struct type * |
| 7805 | to_static_fixed_type (struct type *type0) |
| 7806 | { |
| 7807 | struct type *type; |
| 7808 | |
| 7809 | if (type0 == NULL) |
| 7810 | return NULL; |
| 7811 | |
| 7812 | if (TYPE_FIXED_INSTANCE (type0)) |
| 7813 | return type0; |
| 7814 | |
| 7815 | type0 = ada_check_typedef (type0); |
| 7816 | |
| 7817 | switch (TYPE_CODE (type0)) |
| 7818 | { |
| 7819 | default: |
| 7820 | return type0; |
| 7821 | case TYPE_CODE_STRUCT: |
| 7822 | type = dynamic_template_type (type0); |
| 7823 | if (type != NULL) |
| 7824 | return template_to_static_fixed_type (type); |
| 7825 | else |
| 7826 | return template_to_static_fixed_type (type0); |
| 7827 | case TYPE_CODE_UNION: |
| 7828 | type = ada_find_parallel_type (type0, "___XVU"); |
| 7829 | if (type != NULL) |
| 7830 | return template_to_static_fixed_type (type); |
| 7831 | else |
| 7832 | return template_to_static_fixed_type (type0); |
| 7833 | } |
| 7834 | } |
| 7835 | |
| 7836 | /* A static approximation of TYPE with all type wrappers removed. */ |
| 7837 | |
| 7838 | static struct type * |
| 7839 | static_unwrap_type (struct type *type) |
| 7840 | { |
| 7841 | if (ada_is_aligner_type (type)) |
| 7842 | { |
| 7843 | struct type *type1 = TYPE_FIELD_TYPE (ada_check_typedef (type), 0); |
| 7844 | if (ada_type_name (type1) == NULL) |
| 7845 | TYPE_NAME (type1) = ada_type_name (type); |
| 7846 | |
| 7847 | return static_unwrap_type (type1); |
| 7848 | } |
| 7849 | else |
| 7850 | { |
| 7851 | struct type *raw_real_type = ada_get_base_type (type); |
| 7852 | |
| 7853 | if (raw_real_type == type) |
| 7854 | return type; |
| 7855 | else |
| 7856 | return to_static_fixed_type (raw_real_type); |
| 7857 | } |
| 7858 | } |
| 7859 | |
| 7860 | /* In some cases, incomplete and private types require |
| 7861 | cross-references that are not resolved as records (for example, |
| 7862 | type Foo; |
| 7863 | type FooP is access Foo; |
| 7864 | V: FooP; |
| 7865 | type Foo is array ...; |
| 7866 | ). In these cases, since there is no mechanism for producing |
| 7867 | cross-references to such types, we instead substitute for FooP a |
| 7868 | stub enumeration type that is nowhere resolved, and whose tag is |
| 7869 | the name of the actual type. Call these types "non-record stubs". */ |
| 7870 | |
| 7871 | /* A type equivalent to TYPE that is not a non-record stub, if one |
| 7872 | exists, otherwise TYPE. */ |
| 7873 | |
| 7874 | struct type * |
| 7875 | ada_check_typedef (struct type *type) |
| 7876 | { |
| 7877 | if (type == NULL) |
| 7878 | return NULL; |
| 7879 | |
| 7880 | /* If our type is a typedef type of a fat pointer, then we're done. |
| 7881 | We don't want to strip the TYPE_CODE_TYPDEF layer, because this is |
| 7882 | what allows us to distinguish between fat pointers that represent |
| 7883 | array types, and fat pointers that represent array access types |
| 7884 | (in both cases, the compiler implements them as fat pointers). */ |
| 7885 | if (TYPE_CODE (type) == TYPE_CODE_TYPEDEF |
| 7886 | && is_thick_pntr (ada_typedef_target_type (type))) |
| 7887 | return type; |
| 7888 | |
| 7889 | CHECK_TYPEDEF (type); |
| 7890 | if (type == NULL || TYPE_CODE (type) != TYPE_CODE_ENUM |
| 7891 | || !TYPE_STUB (type) |
| 7892 | || TYPE_TAG_NAME (type) == NULL) |
| 7893 | return type; |
| 7894 | else |
| 7895 | { |
| 7896 | char *name = TYPE_TAG_NAME (type); |
| 7897 | struct type *type1 = ada_find_any_type (name); |
| 7898 | |
| 7899 | if (type1 == NULL) |
| 7900 | return type; |
| 7901 | |
| 7902 | /* TYPE1 might itself be a TYPE_CODE_TYPEDEF (this can happen with |
| 7903 | stubs pointing to arrays, as we don't create symbols for array |
| 7904 | types, only for the typedef-to-array types). If that's the case, |
| 7905 | strip the typedef layer. */ |
| 7906 | if (TYPE_CODE (type1) == TYPE_CODE_TYPEDEF) |
| 7907 | type1 = ada_check_typedef (type1); |
| 7908 | |
| 7909 | return type1; |
| 7910 | } |
| 7911 | } |
| 7912 | |
| 7913 | /* A value representing the data at VALADDR/ADDRESS as described by |
| 7914 | type TYPE0, but with a standard (static-sized) type that correctly |
| 7915 | describes it. If VAL0 is not NULL and TYPE0 already is a standard |
| 7916 | type, then return VAL0 [this feature is simply to avoid redundant |
| 7917 | creation of struct values]. */ |
| 7918 | |
| 7919 | static struct value * |
| 7920 | ada_to_fixed_value_create (struct type *type0, CORE_ADDR address, |
| 7921 | struct value *val0) |
| 7922 | { |
| 7923 | struct type *type = ada_to_fixed_type (type0, 0, address, NULL, 1); |
| 7924 | |
| 7925 | if (type == type0 && val0 != NULL) |
| 7926 | return val0; |
| 7927 | else |
| 7928 | return value_from_contents_and_address (type, 0, address); |
| 7929 | } |
| 7930 | |
| 7931 | /* A value representing VAL, but with a standard (static-sized) type |
| 7932 | that correctly describes it. Does not necessarily create a new |
| 7933 | value. */ |
| 7934 | |
| 7935 | struct value * |
| 7936 | ada_to_fixed_value (struct value *val) |
| 7937 | { |
| 7938 | return ada_to_fixed_value_create (value_type (val), |
| 7939 | value_address (val), |
| 7940 | val); |
| 7941 | } |
| 7942 | \f |
| 7943 | |
| 7944 | /* Attributes */ |
| 7945 | |
| 7946 | /* Table mapping attribute numbers to names. |
| 7947 | NOTE: Keep up to date with enum ada_attribute definition in ada-lang.h. */ |
| 7948 | |
| 7949 | static const char *attribute_names[] = { |
| 7950 | "<?>", |
| 7951 | |
| 7952 | "first", |
| 7953 | "last", |
| 7954 | "length", |
| 7955 | "image", |
| 7956 | "max", |
| 7957 | "min", |
| 7958 | "modulus", |
| 7959 | "pos", |
| 7960 | "size", |
| 7961 | "tag", |
| 7962 | "val", |
| 7963 | 0 |
| 7964 | }; |
| 7965 | |
| 7966 | const char * |
| 7967 | ada_attribute_name (enum exp_opcode n) |
| 7968 | { |
| 7969 | if (n >= OP_ATR_FIRST && n <= (int) OP_ATR_VAL) |
| 7970 | return attribute_names[n - OP_ATR_FIRST + 1]; |
| 7971 | else |
| 7972 | return attribute_names[0]; |
| 7973 | } |
| 7974 | |
| 7975 | /* Evaluate the 'POS attribute applied to ARG. */ |
| 7976 | |
| 7977 | static LONGEST |
| 7978 | pos_atr (struct value *arg) |
| 7979 | { |
| 7980 | struct value *val = coerce_ref (arg); |
| 7981 | struct type *type = value_type (val); |
| 7982 | |
| 7983 | if (!discrete_type_p (type)) |
| 7984 | error (_("'POS only defined on discrete types")); |
| 7985 | |
| 7986 | if (TYPE_CODE (type) == TYPE_CODE_ENUM) |
| 7987 | { |
| 7988 | int i; |
| 7989 | LONGEST v = value_as_long (val); |
| 7990 | |
| 7991 | for (i = 0; i < TYPE_NFIELDS (type); i += 1) |
| 7992 | { |
| 7993 | if (v == TYPE_FIELD_BITPOS (type, i)) |
| 7994 | return i; |
| 7995 | } |
| 7996 | error (_("enumeration value is invalid: can't find 'POS")); |
| 7997 | } |
| 7998 | else |
| 7999 | return value_as_long (val); |
| 8000 | } |
| 8001 | |
| 8002 | static struct value * |
| 8003 | value_pos_atr (struct type *type, struct value *arg) |
| 8004 | { |
| 8005 | return value_from_longest (type, pos_atr (arg)); |
| 8006 | } |
| 8007 | |
| 8008 | /* Evaluate the TYPE'VAL attribute applied to ARG. */ |
| 8009 | |
| 8010 | static struct value * |
| 8011 | value_val_atr (struct type *type, struct value *arg) |
| 8012 | { |
| 8013 | if (!discrete_type_p (type)) |
| 8014 | error (_("'VAL only defined on discrete types")); |
| 8015 | if (!integer_type_p (value_type (arg))) |
| 8016 | error (_("'VAL requires integral argument")); |
| 8017 | |
| 8018 | if (TYPE_CODE (type) == TYPE_CODE_ENUM) |
| 8019 | { |
| 8020 | long pos = value_as_long (arg); |
| 8021 | |
| 8022 | if (pos < 0 || pos >= TYPE_NFIELDS (type)) |
| 8023 | error (_("argument to 'VAL out of range")); |
| 8024 | return value_from_longest (type, TYPE_FIELD_BITPOS (type, pos)); |
| 8025 | } |
| 8026 | else |
| 8027 | return value_from_longest (type, value_as_long (arg)); |
| 8028 | } |
| 8029 | \f |
| 8030 | |
| 8031 | /* Evaluation */ |
| 8032 | |
| 8033 | /* True if TYPE appears to be an Ada character type. |
| 8034 | [At the moment, this is true only for Character and Wide_Character; |
| 8035 | It is a heuristic test that could stand improvement]. */ |
| 8036 | |
| 8037 | int |
| 8038 | ada_is_character_type (struct type *type) |
| 8039 | { |
| 8040 | const char *name; |
| 8041 | |
| 8042 | /* If the type code says it's a character, then assume it really is, |
| 8043 | and don't check any further. */ |
| 8044 | if (TYPE_CODE (type) == TYPE_CODE_CHAR) |
| 8045 | return 1; |
| 8046 | |
| 8047 | /* Otherwise, assume it's a character type iff it is a discrete type |
| 8048 | with a known character type name. */ |
| 8049 | name = ada_type_name (type); |
| 8050 | return (name != NULL |
| 8051 | && (TYPE_CODE (type) == TYPE_CODE_INT |
| 8052 | || TYPE_CODE (type) == TYPE_CODE_RANGE) |
| 8053 | && (strcmp (name, "character") == 0 |
| 8054 | || strcmp (name, "wide_character") == 0 |
| 8055 | || strcmp (name, "wide_wide_character") == 0 |
| 8056 | || strcmp (name, "unsigned char") == 0)); |
| 8057 | } |
| 8058 | |
| 8059 | /* True if TYPE appears to be an Ada string type. */ |
| 8060 | |
| 8061 | int |
| 8062 | ada_is_string_type (struct type *type) |
| 8063 | { |
| 8064 | type = ada_check_typedef (type); |
| 8065 | if (type != NULL |
| 8066 | && TYPE_CODE (type) != TYPE_CODE_PTR |
| 8067 | && (ada_is_simple_array_type (type) |
| 8068 | || ada_is_array_descriptor_type (type)) |
| 8069 | && ada_array_arity (type) == 1) |
| 8070 | { |
| 8071 | struct type *elttype = ada_array_element_type (type, 1); |
| 8072 | |
| 8073 | return ada_is_character_type (elttype); |
| 8074 | } |
| 8075 | else |
| 8076 | return 0; |
| 8077 | } |
| 8078 | |
| 8079 | /* The compiler sometimes provides a parallel XVS type for a given |
| 8080 | PAD type. Normally, it is safe to follow the PAD type directly, |
| 8081 | but older versions of the compiler have a bug that causes the offset |
| 8082 | of its "F" field to be wrong. Following that field in that case |
| 8083 | would lead to incorrect results, but this can be worked around |
| 8084 | by ignoring the PAD type and using the associated XVS type instead. |
| 8085 | |
| 8086 | Set to True if the debugger should trust the contents of PAD types. |
| 8087 | Otherwise, ignore the PAD type if there is a parallel XVS type. */ |
| 8088 | static int trust_pad_over_xvs = 1; |
| 8089 | |
| 8090 | /* True if TYPE is a struct type introduced by the compiler to force the |
| 8091 | alignment of a value. Such types have a single field with a |
| 8092 | distinctive name. */ |
| 8093 | |
| 8094 | int |
| 8095 | ada_is_aligner_type (struct type *type) |
| 8096 | { |
| 8097 | type = ada_check_typedef (type); |
| 8098 | |
| 8099 | if (!trust_pad_over_xvs && ada_find_parallel_type (type, "___XVS") != NULL) |
| 8100 | return 0; |
| 8101 | |
| 8102 | return (TYPE_CODE (type) == TYPE_CODE_STRUCT |
| 8103 | && TYPE_NFIELDS (type) == 1 |
| 8104 | && strcmp (TYPE_FIELD_NAME (type, 0), "F") == 0); |
| 8105 | } |
| 8106 | |
| 8107 | /* If there is an ___XVS-convention type parallel to SUBTYPE, return |
| 8108 | the parallel type. */ |
| 8109 | |
| 8110 | struct type * |
| 8111 | ada_get_base_type (struct type *raw_type) |
| 8112 | { |
| 8113 | struct type *real_type_namer; |
| 8114 | struct type *raw_real_type; |
| 8115 | |
| 8116 | if (raw_type == NULL || TYPE_CODE (raw_type) != TYPE_CODE_STRUCT) |
| 8117 | return raw_type; |
| 8118 | |
| 8119 | if (ada_is_aligner_type (raw_type)) |
| 8120 | /* The encoding specifies that we should always use the aligner type. |
| 8121 | So, even if this aligner type has an associated XVS type, we should |
| 8122 | simply ignore it. |
| 8123 | |
| 8124 | According to the compiler gurus, an XVS type parallel to an aligner |
| 8125 | type may exist because of a stabs limitation. In stabs, aligner |
| 8126 | types are empty because the field has a variable-sized type, and |
| 8127 | thus cannot actually be used as an aligner type. As a result, |
| 8128 | we need the associated parallel XVS type to decode the type. |
| 8129 | Since the policy in the compiler is to not change the internal |
| 8130 | representation based on the debugging info format, we sometimes |
| 8131 | end up having a redundant XVS type parallel to the aligner type. */ |
| 8132 | return raw_type; |
| 8133 | |
| 8134 | real_type_namer = ada_find_parallel_type (raw_type, "___XVS"); |
| 8135 | if (real_type_namer == NULL |
| 8136 | || TYPE_CODE (real_type_namer) != TYPE_CODE_STRUCT |
| 8137 | || TYPE_NFIELDS (real_type_namer) != 1) |
| 8138 | return raw_type; |
| 8139 | |
| 8140 | if (TYPE_CODE (TYPE_FIELD_TYPE (real_type_namer, 0)) != TYPE_CODE_REF) |
| 8141 | { |
| 8142 | /* This is an older encoding form where the base type needs to be |
| 8143 | looked up by name. We prefer the newer enconding because it is |
| 8144 | more efficient. */ |
| 8145 | raw_real_type = ada_find_any_type (TYPE_FIELD_NAME (real_type_namer, 0)); |
| 8146 | if (raw_real_type == NULL) |
| 8147 | return raw_type; |
| 8148 | else |
| 8149 | return raw_real_type; |
| 8150 | } |
| 8151 | |
| 8152 | /* The field in our XVS type is a reference to the base type. */ |
| 8153 | return TYPE_TARGET_TYPE (TYPE_FIELD_TYPE (real_type_namer, 0)); |
| 8154 | } |
| 8155 | |
| 8156 | /* The type of value designated by TYPE, with all aligners removed. */ |
| 8157 | |
| 8158 | struct type * |
| 8159 | ada_aligned_type (struct type *type) |
| 8160 | { |
| 8161 | if (ada_is_aligner_type (type)) |
| 8162 | return ada_aligned_type (TYPE_FIELD_TYPE (type, 0)); |
| 8163 | else |
| 8164 | return ada_get_base_type (type); |
| 8165 | } |
| 8166 | |
| 8167 | |
| 8168 | /* The address of the aligned value in an object at address VALADDR |
| 8169 | having type TYPE. Assumes ada_is_aligner_type (TYPE). */ |
| 8170 | |
| 8171 | const gdb_byte * |
| 8172 | ada_aligned_value_addr (struct type *type, const gdb_byte *valaddr) |
| 8173 | { |
| 8174 | if (ada_is_aligner_type (type)) |
| 8175 | return ada_aligned_value_addr (TYPE_FIELD_TYPE (type, 0), |
| 8176 | valaddr + |
| 8177 | TYPE_FIELD_BITPOS (type, |
| 8178 | 0) / TARGET_CHAR_BIT); |
| 8179 | else |
| 8180 | return valaddr; |
| 8181 | } |
| 8182 | |
| 8183 | |
| 8184 | |
| 8185 | /* The printed representation of an enumeration literal with encoded |
| 8186 | name NAME. The value is good to the next call of ada_enum_name. */ |
| 8187 | const char * |
| 8188 | ada_enum_name (const char *name) |
| 8189 | { |
| 8190 | static char *result; |
| 8191 | static size_t result_len = 0; |
| 8192 | char *tmp; |
| 8193 | |
| 8194 | /* First, unqualify the enumeration name: |
| 8195 | 1. Search for the last '.' character. If we find one, then skip |
| 8196 | all the preceeding characters, the unqualified name starts |
| 8197 | right after that dot. |
| 8198 | 2. Otherwise, we may be debugging on a target where the compiler |
| 8199 | translates dots into "__". Search forward for double underscores, |
| 8200 | but stop searching when we hit an overloading suffix, which is |
| 8201 | of the form "__" followed by digits. */ |
| 8202 | |
| 8203 | tmp = strrchr (name, '.'); |
| 8204 | if (tmp != NULL) |
| 8205 | name = tmp + 1; |
| 8206 | else |
| 8207 | { |
| 8208 | while ((tmp = strstr (name, "__")) != NULL) |
| 8209 | { |
| 8210 | if (isdigit (tmp[2])) |
| 8211 | break; |
| 8212 | else |
| 8213 | name = tmp + 2; |
| 8214 | } |
| 8215 | } |
| 8216 | |
| 8217 | if (name[0] == 'Q') |
| 8218 | { |
| 8219 | int v; |
| 8220 | |
| 8221 | if (name[1] == 'U' || name[1] == 'W') |
| 8222 | { |
| 8223 | if (sscanf (name + 2, "%x", &v) != 1) |
| 8224 | return name; |
| 8225 | } |
| 8226 | else |
| 8227 | return name; |
| 8228 | |
| 8229 | GROW_VECT (result, result_len, 16); |
| 8230 | if (isascii (v) && isprint (v)) |
| 8231 | xsnprintf (result, result_len, "'%c'", v); |
| 8232 | else if (name[1] == 'U') |
| 8233 | xsnprintf (result, result_len, "[\"%02x\"]", v); |
| 8234 | else |
| 8235 | xsnprintf (result, result_len, "[\"%04x\"]", v); |
| 8236 | |
| 8237 | return result; |
| 8238 | } |
| 8239 | else |
| 8240 | { |
| 8241 | tmp = strstr (name, "__"); |
| 8242 | if (tmp == NULL) |
| 8243 | tmp = strstr (name, "$"); |
| 8244 | if (tmp != NULL) |
| 8245 | { |
| 8246 | GROW_VECT (result, result_len, tmp - name + 1); |
| 8247 | strncpy (result, name, tmp - name); |
| 8248 | result[tmp - name] = '\0'; |
| 8249 | return result; |
| 8250 | } |
| 8251 | |
| 8252 | return name; |
| 8253 | } |
| 8254 | } |
| 8255 | |
| 8256 | /* Evaluate the subexpression of EXP starting at *POS as for |
| 8257 | evaluate_type, updating *POS to point just past the evaluated |
| 8258 | expression. */ |
| 8259 | |
| 8260 | static struct value * |
| 8261 | evaluate_subexp_type (struct expression *exp, int *pos) |
| 8262 | { |
| 8263 | return evaluate_subexp (NULL_TYPE, exp, pos, EVAL_AVOID_SIDE_EFFECTS); |
| 8264 | } |
| 8265 | |
| 8266 | /* If VAL is wrapped in an aligner or subtype wrapper, return the |
| 8267 | value it wraps. */ |
| 8268 | |
| 8269 | static struct value * |
| 8270 | unwrap_value (struct value *val) |
| 8271 | { |
| 8272 | struct type *type = ada_check_typedef (value_type (val)); |
| 8273 | |
| 8274 | if (ada_is_aligner_type (type)) |
| 8275 | { |
| 8276 | struct value *v = ada_value_struct_elt (val, "F", 0); |
| 8277 | struct type *val_type = ada_check_typedef (value_type (v)); |
| 8278 | |
| 8279 | if (ada_type_name (val_type) == NULL) |
| 8280 | TYPE_NAME (val_type) = ada_type_name (type); |
| 8281 | |
| 8282 | return unwrap_value (v); |
| 8283 | } |
| 8284 | else |
| 8285 | { |
| 8286 | struct type *raw_real_type = |
| 8287 | ada_check_typedef (ada_get_base_type (type)); |
| 8288 | |
| 8289 | /* If there is no parallel XVS or XVE type, then the value is |
| 8290 | already unwrapped. Return it without further modification. */ |
| 8291 | if ((type == raw_real_type) |
| 8292 | && ada_find_parallel_type (type, "___XVE") == NULL) |
| 8293 | return val; |
| 8294 | |
| 8295 | return |
| 8296 | coerce_unspec_val_to_type |
| 8297 | (val, ada_to_fixed_type (raw_real_type, 0, |
| 8298 | value_address (val), |
| 8299 | NULL, 1)); |
| 8300 | } |
| 8301 | } |
| 8302 | |
| 8303 | static struct value * |
| 8304 | cast_to_fixed (struct type *type, struct value *arg) |
| 8305 | { |
| 8306 | LONGEST val; |
| 8307 | |
| 8308 | if (type == value_type (arg)) |
| 8309 | return arg; |
| 8310 | else if (ada_is_fixed_point_type (value_type (arg))) |
| 8311 | val = ada_float_to_fixed (type, |
| 8312 | ada_fixed_to_float (value_type (arg), |
| 8313 | value_as_long (arg))); |
| 8314 | else |
| 8315 | { |
| 8316 | DOUBLEST argd = value_as_double (arg); |
| 8317 | |
| 8318 | val = ada_float_to_fixed (type, argd); |
| 8319 | } |
| 8320 | |
| 8321 | return value_from_longest (type, val); |
| 8322 | } |
| 8323 | |
| 8324 | static struct value * |
| 8325 | cast_from_fixed (struct type *type, struct value *arg) |
| 8326 | { |
| 8327 | DOUBLEST val = ada_fixed_to_float (value_type (arg), |
| 8328 | value_as_long (arg)); |
| 8329 | |
| 8330 | return value_from_double (type, val); |
| 8331 | } |
| 8332 | |
| 8333 | /* Coerce VAL as necessary for assignment to an lval of type TYPE, and |
| 8334 | return the converted value. */ |
| 8335 | |
| 8336 | static struct value * |
| 8337 | coerce_for_assign (struct type *type, struct value *val) |
| 8338 | { |
| 8339 | struct type *type2 = value_type (val); |
| 8340 | |
| 8341 | if (type == type2) |
| 8342 | return val; |
| 8343 | |
| 8344 | type2 = ada_check_typedef (type2); |
| 8345 | type = ada_check_typedef (type); |
| 8346 | |
| 8347 | if (TYPE_CODE (type2) == TYPE_CODE_PTR |
| 8348 | && TYPE_CODE (type) == TYPE_CODE_ARRAY) |
| 8349 | { |
| 8350 | val = ada_value_ind (val); |
| 8351 | type2 = value_type (val); |
| 8352 | } |
| 8353 | |
| 8354 | if (TYPE_CODE (type2) == TYPE_CODE_ARRAY |
| 8355 | && TYPE_CODE (type) == TYPE_CODE_ARRAY) |
| 8356 | { |
| 8357 | if (TYPE_LENGTH (type2) != TYPE_LENGTH (type) |
| 8358 | || TYPE_LENGTH (TYPE_TARGET_TYPE (type2)) |
| 8359 | != TYPE_LENGTH (TYPE_TARGET_TYPE (type2))) |
| 8360 | error (_("Incompatible types in assignment")); |
| 8361 | deprecated_set_value_type (val, type); |
| 8362 | } |
| 8363 | return val; |
| 8364 | } |
| 8365 | |
| 8366 | static struct value * |
| 8367 | ada_value_binop (struct value *arg1, struct value *arg2, enum exp_opcode op) |
| 8368 | { |
| 8369 | struct value *val; |
| 8370 | struct type *type1, *type2; |
| 8371 | LONGEST v, v1, v2; |
| 8372 | |
| 8373 | arg1 = coerce_ref (arg1); |
| 8374 | arg2 = coerce_ref (arg2); |
| 8375 | type1 = base_type (ada_check_typedef (value_type (arg1))); |
| 8376 | type2 = base_type (ada_check_typedef (value_type (arg2))); |
| 8377 | |
| 8378 | if (TYPE_CODE (type1) != TYPE_CODE_INT |
| 8379 | || TYPE_CODE (type2) != TYPE_CODE_INT) |
| 8380 | return value_binop (arg1, arg2, op); |
| 8381 | |
| 8382 | switch (op) |
| 8383 | { |
| 8384 | case BINOP_MOD: |
| 8385 | case BINOP_DIV: |
| 8386 | case BINOP_REM: |
| 8387 | break; |
| 8388 | default: |
| 8389 | return value_binop (arg1, arg2, op); |
| 8390 | } |
| 8391 | |
| 8392 | v2 = value_as_long (arg2); |
| 8393 | if (v2 == 0) |
| 8394 | error (_("second operand of %s must not be zero."), op_string (op)); |
| 8395 | |
| 8396 | if (TYPE_UNSIGNED (type1) || op == BINOP_MOD) |
| 8397 | return value_binop (arg1, arg2, op); |
| 8398 | |
| 8399 | v1 = value_as_long (arg1); |
| 8400 | switch (op) |
| 8401 | { |
| 8402 | case BINOP_DIV: |
| 8403 | v = v1 / v2; |
| 8404 | if (!TRUNCATION_TOWARDS_ZERO && v1 * (v1 % v2) < 0) |
| 8405 | v += v > 0 ? -1 : 1; |
| 8406 | break; |
| 8407 | case BINOP_REM: |
| 8408 | v = v1 % v2; |
| 8409 | if (v * v1 < 0) |
| 8410 | v -= v2; |
| 8411 | break; |
| 8412 | default: |
| 8413 | /* Should not reach this point. */ |
| 8414 | v = 0; |
| 8415 | } |
| 8416 | |
| 8417 | val = allocate_value (type1); |
| 8418 | store_unsigned_integer (value_contents_raw (val), |
| 8419 | TYPE_LENGTH (value_type (val)), |
| 8420 | gdbarch_byte_order (get_type_arch (type1)), v); |
| 8421 | return val; |
| 8422 | } |
| 8423 | |
| 8424 | static int |
| 8425 | ada_value_equal (struct value *arg1, struct value *arg2) |
| 8426 | { |
| 8427 | if (ada_is_direct_array_type (value_type (arg1)) |
| 8428 | || ada_is_direct_array_type (value_type (arg2))) |
| 8429 | { |
| 8430 | /* Automatically dereference any array reference before |
| 8431 | we attempt to perform the comparison. */ |
| 8432 | arg1 = ada_coerce_ref (arg1); |
| 8433 | arg2 = ada_coerce_ref (arg2); |
| 8434 | |
| 8435 | arg1 = ada_coerce_to_simple_array (arg1); |
| 8436 | arg2 = ada_coerce_to_simple_array (arg2); |
| 8437 | if (TYPE_CODE (value_type (arg1)) != TYPE_CODE_ARRAY |
| 8438 | || TYPE_CODE (value_type (arg2)) != TYPE_CODE_ARRAY) |
| 8439 | error (_("Attempt to compare array with non-array")); |
| 8440 | /* FIXME: The following works only for types whose |
| 8441 | representations use all bits (no padding or undefined bits) |
| 8442 | and do not have user-defined equality. */ |
| 8443 | return |
| 8444 | TYPE_LENGTH (value_type (arg1)) == TYPE_LENGTH (value_type (arg2)) |
| 8445 | && memcmp (value_contents (arg1), value_contents (arg2), |
| 8446 | TYPE_LENGTH (value_type (arg1))) == 0; |
| 8447 | } |
| 8448 | return value_equal (arg1, arg2); |
| 8449 | } |
| 8450 | |
| 8451 | /* Total number of component associations in the aggregate starting at |
| 8452 | index PC in EXP. Assumes that index PC is the start of an |
| 8453 | OP_AGGREGATE. */ |
| 8454 | |
| 8455 | static int |
| 8456 | num_component_specs (struct expression *exp, int pc) |
| 8457 | { |
| 8458 | int n, m, i; |
| 8459 | |
| 8460 | m = exp->elts[pc + 1].longconst; |
| 8461 | pc += 3; |
| 8462 | n = 0; |
| 8463 | for (i = 0; i < m; i += 1) |
| 8464 | { |
| 8465 | switch (exp->elts[pc].opcode) |
| 8466 | { |
| 8467 | default: |
| 8468 | n += 1; |
| 8469 | break; |
| 8470 | case OP_CHOICES: |
| 8471 | n += exp->elts[pc + 1].longconst; |
| 8472 | break; |
| 8473 | } |
| 8474 | ada_evaluate_subexp (NULL, exp, &pc, EVAL_SKIP); |
| 8475 | } |
| 8476 | return n; |
| 8477 | } |
| 8478 | |
| 8479 | /* Assign the result of evaluating EXP starting at *POS to the INDEXth |
| 8480 | component of LHS (a simple array or a record), updating *POS past |
| 8481 | the expression, assuming that LHS is contained in CONTAINER. Does |
| 8482 | not modify the inferior's memory, nor does it modify LHS (unless |
| 8483 | LHS == CONTAINER). */ |
| 8484 | |
| 8485 | static void |
| 8486 | assign_component (struct value *container, struct value *lhs, LONGEST index, |
| 8487 | struct expression *exp, int *pos) |
| 8488 | { |
| 8489 | struct value *mark = value_mark (); |
| 8490 | struct value *elt; |
| 8491 | |
| 8492 | if (TYPE_CODE (value_type (lhs)) == TYPE_CODE_ARRAY) |
| 8493 | { |
| 8494 | struct type *index_type = builtin_type (exp->gdbarch)->builtin_int; |
| 8495 | struct value *index_val = value_from_longest (index_type, index); |
| 8496 | |
| 8497 | elt = unwrap_value (ada_value_subscript (lhs, 1, &index_val)); |
| 8498 | } |
| 8499 | else |
| 8500 | { |
| 8501 | elt = ada_index_struct_field (index, lhs, 0, value_type (lhs)); |
| 8502 | elt = ada_to_fixed_value (unwrap_value (elt)); |
| 8503 | } |
| 8504 | |
| 8505 | if (exp->elts[*pos].opcode == OP_AGGREGATE) |
| 8506 | assign_aggregate (container, elt, exp, pos, EVAL_NORMAL); |
| 8507 | else |
| 8508 | value_assign_to_component (container, elt, |
| 8509 | ada_evaluate_subexp (NULL, exp, pos, |
| 8510 | EVAL_NORMAL)); |
| 8511 | |
| 8512 | value_free_to_mark (mark); |
| 8513 | } |
| 8514 | |
| 8515 | /* Assuming that LHS represents an lvalue having a record or array |
| 8516 | type, and EXP->ELTS[*POS] is an OP_AGGREGATE, evaluate an assignment |
| 8517 | of that aggregate's value to LHS, advancing *POS past the |
| 8518 | aggregate. NOSIDE is as for evaluate_subexp. CONTAINER is an |
| 8519 | lvalue containing LHS (possibly LHS itself). Does not modify |
| 8520 | the inferior's memory, nor does it modify the contents of |
| 8521 | LHS (unless == CONTAINER). Returns the modified CONTAINER. */ |
| 8522 | |
| 8523 | static struct value * |
| 8524 | assign_aggregate (struct value *container, |
| 8525 | struct value *lhs, struct expression *exp, |
| 8526 | int *pos, enum noside noside) |
| 8527 | { |
| 8528 | struct type *lhs_type; |
| 8529 | int n = exp->elts[*pos+1].longconst; |
| 8530 | LONGEST low_index, high_index; |
| 8531 | int num_specs; |
| 8532 | LONGEST *indices; |
| 8533 | int max_indices, num_indices; |
| 8534 | int is_array_aggregate; |
| 8535 | int i; |
| 8536 | |
| 8537 | *pos += 3; |
| 8538 | if (noside != EVAL_NORMAL) |
| 8539 | { |
| 8540 | int i; |
| 8541 | |
| 8542 | for (i = 0; i < n; i += 1) |
| 8543 | ada_evaluate_subexp (NULL, exp, pos, noside); |
| 8544 | return container; |
| 8545 | } |
| 8546 | |
| 8547 | container = ada_coerce_ref (container); |
| 8548 | if (ada_is_direct_array_type (value_type (container))) |
| 8549 | container = ada_coerce_to_simple_array (container); |
| 8550 | lhs = ada_coerce_ref (lhs); |
| 8551 | if (!deprecated_value_modifiable (lhs)) |
| 8552 | error (_("Left operand of assignment is not a modifiable lvalue.")); |
| 8553 | |
| 8554 | lhs_type = value_type (lhs); |
| 8555 | if (ada_is_direct_array_type (lhs_type)) |
| 8556 | { |
| 8557 | lhs = ada_coerce_to_simple_array (lhs); |
| 8558 | lhs_type = value_type (lhs); |
| 8559 | low_index = TYPE_ARRAY_LOWER_BOUND_VALUE (lhs_type); |
| 8560 | high_index = TYPE_ARRAY_UPPER_BOUND_VALUE (lhs_type); |
| 8561 | is_array_aggregate = 1; |
| 8562 | } |
| 8563 | else if (TYPE_CODE (lhs_type) == TYPE_CODE_STRUCT) |
| 8564 | { |
| 8565 | low_index = 0; |
| 8566 | high_index = num_visible_fields (lhs_type) - 1; |
| 8567 | is_array_aggregate = 0; |
| 8568 | } |
| 8569 | else |
| 8570 | error (_("Left-hand side must be array or record.")); |
| 8571 | |
| 8572 | num_specs = num_component_specs (exp, *pos - 3); |
| 8573 | max_indices = 4 * num_specs + 4; |
| 8574 | indices = alloca (max_indices * sizeof (indices[0])); |
| 8575 | indices[0] = indices[1] = low_index - 1; |
| 8576 | indices[2] = indices[3] = high_index + 1; |
| 8577 | num_indices = 4; |
| 8578 | |
| 8579 | for (i = 0; i < n; i += 1) |
| 8580 | { |
| 8581 | switch (exp->elts[*pos].opcode) |
| 8582 | { |
| 8583 | case OP_CHOICES: |
| 8584 | aggregate_assign_from_choices (container, lhs, exp, pos, indices, |
| 8585 | &num_indices, max_indices, |
| 8586 | low_index, high_index); |
| 8587 | break; |
| 8588 | case OP_POSITIONAL: |
| 8589 | aggregate_assign_positional (container, lhs, exp, pos, indices, |
| 8590 | &num_indices, max_indices, |
| 8591 | low_index, high_index); |
| 8592 | break; |
| 8593 | case OP_OTHERS: |
| 8594 | if (i != n-1) |
| 8595 | error (_("Misplaced 'others' clause")); |
| 8596 | aggregate_assign_others (container, lhs, exp, pos, indices, |
| 8597 | num_indices, low_index, high_index); |
| 8598 | break; |
| 8599 | default: |
| 8600 | error (_("Internal error: bad aggregate clause")); |
| 8601 | } |
| 8602 | } |
| 8603 | |
| 8604 | return container; |
| 8605 | } |
| 8606 | |
| 8607 | /* Assign into the component of LHS indexed by the OP_POSITIONAL |
| 8608 | construct at *POS, updating *POS past the construct, given that |
| 8609 | the positions are relative to lower bound LOW, where HIGH is the |
| 8610 | upper bound. Record the position in INDICES[0 .. MAX_INDICES-1] |
| 8611 | updating *NUM_INDICES as needed. CONTAINER is as for |
| 8612 | assign_aggregate. */ |
| 8613 | static void |
| 8614 | aggregate_assign_positional (struct value *container, |
| 8615 | struct value *lhs, struct expression *exp, |
| 8616 | int *pos, LONGEST *indices, int *num_indices, |
| 8617 | int max_indices, LONGEST low, LONGEST high) |
| 8618 | { |
| 8619 | LONGEST ind = longest_to_int (exp->elts[*pos + 1].longconst) + low; |
| 8620 | |
| 8621 | if (ind - 1 == high) |
| 8622 | warning (_("Extra components in aggregate ignored.")); |
| 8623 | if (ind <= high) |
| 8624 | { |
| 8625 | add_component_interval (ind, ind, indices, num_indices, max_indices); |
| 8626 | *pos += 3; |
| 8627 | assign_component (container, lhs, ind, exp, pos); |
| 8628 | } |
| 8629 | else |
| 8630 | ada_evaluate_subexp (NULL, exp, pos, EVAL_SKIP); |
| 8631 | } |
| 8632 | |
| 8633 | /* Assign into the components of LHS indexed by the OP_CHOICES |
| 8634 | construct at *POS, updating *POS past the construct, given that |
| 8635 | the allowable indices are LOW..HIGH. Record the indices assigned |
| 8636 | to in INDICES[0 .. MAX_INDICES-1], updating *NUM_INDICES as |
| 8637 | needed. CONTAINER is as for assign_aggregate. */ |
| 8638 | static void |
| 8639 | aggregate_assign_from_choices (struct value *container, |
| 8640 | struct value *lhs, struct expression *exp, |
| 8641 | int *pos, LONGEST *indices, int *num_indices, |
| 8642 | int max_indices, LONGEST low, LONGEST high) |
| 8643 | { |
| 8644 | int j; |
| 8645 | int n_choices = longest_to_int (exp->elts[*pos+1].longconst); |
| 8646 | int choice_pos, expr_pc; |
| 8647 | int is_array = ada_is_direct_array_type (value_type (lhs)); |
| 8648 | |
| 8649 | choice_pos = *pos += 3; |
| 8650 | |
| 8651 | for (j = 0; j < n_choices; j += 1) |
| 8652 | ada_evaluate_subexp (NULL, exp, pos, EVAL_SKIP); |
| 8653 | expr_pc = *pos; |
| 8654 | ada_evaluate_subexp (NULL, exp, pos, EVAL_SKIP); |
| 8655 | |
| 8656 | for (j = 0; j < n_choices; j += 1) |
| 8657 | { |
| 8658 | LONGEST lower, upper; |
| 8659 | enum exp_opcode op = exp->elts[choice_pos].opcode; |
| 8660 | |
| 8661 | if (op == OP_DISCRETE_RANGE) |
| 8662 | { |
| 8663 | choice_pos += 1; |
| 8664 | lower = value_as_long (ada_evaluate_subexp (NULL, exp, pos, |
| 8665 | EVAL_NORMAL)); |
| 8666 | upper = value_as_long (ada_evaluate_subexp (NULL, exp, pos, |
| 8667 | EVAL_NORMAL)); |
| 8668 | } |
| 8669 | else if (is_array) |
| 8670 | { |
| 8671 | lower = value_as_long (ada_evaluate_subexp (NULL, exp, &choice_pos, |
| 8672 | EVAL_NORMAL)); |
| 8673 | upper = lower; |
| 8674 | } |
| 8675 | else |
| 8676 | { |
| 8677 | int ind; |
| 8678 | char *name; |
| 8679 | |
| 8680 | switch (op) |
| 8681 | { |
| 8682 | case OP_NAME: |
| 8683 | name = &exp->elts[choice_pos + 2].string; |
| 8684 | break; |
| 8685 | case OP_VAR_VALUE: |
| 8686 | name = SYMBOL_NATURAL_NAME (exp->elts[choice_pos + 2].symbol); |
| 8687 | break; |
| 8688 | default: |
| 8689 | error (_("Invalid record component association.")); |
| 8690 | } |
| 8691 | ada_evaluate_subexp (NULL, exp, &choice_pos, EVAL_SKIP); |
| 8692 | ind = 0; |
| 8693 | if (! find_struct_field (name, value_type (lhs), 0, |
| 8694 | NULL, NULL, NULL, NULL, &ind)) |
| 8695 | error (_("Unknown component name: %s."), name); |
| 8696 | lower = upper = ind; |
| 8697 | } |
| 8698 | |
| 8699 | if (lower <= upper && (lower < low || upper > high)) |
| 8700 | error (_("Index in component association out of bounds.")); |
| 8701 | |
| 8702 | add_component_interval (lower, upper, indices, num_indices, |
| 8703 | max_indices); |
| 8704 | while (lower <= upper) |
| 8705 | { |
| 8706 | int pos1; |
| 8707 | |
| 8708 | pos1 = expr_pc; |
| 8709 | assign_component (container, lhs, lower, exp, &pos1); |
| 8710 | lower += 1; |
| 8711 | } |
| 8712 | } |
| 8713 | } |
| 8714 | |
| 8715 | /* Assign the value of the expression in the OP_OTHERS construct in |
| 8716 | EXP at *POS into the components of LHS indexed from LOW .. HIGH that |
| 8717 | have not been previously assigned. The index intervals already assigned |
| 8718 | are in INDICES[0 .. NUM_INDICES-1]. Updates *POS to after the |
| 8719 | OP_OTHERS clause. CONTAINER is as for assign_aggregate. */ |
| 8720 | static void |
| 8721 | aggregate_assign_others (struct value *container, |
| 8722 | struct value *lhs, struct expression *exp, |
| 8723 | int *pos, LONGEST *indices, int num_indices, |
| 8724 | LONGEST low, LONGEST high) |
| 8725 | { |
| 8726 | int i; |
| 8727 | int expr_pc = *pos + 1; |
| 8728 | |
| 8729 | for (i = 0; i < num_indices - 2; i += 2) |
| 8730 | { |
| 8731 | LONGEST ind; |
| 8732 | |
| 8733 | for (ind = indices[i + 1] + 1; ind < indices[i + 2]; ind += 1) |
| 8734 | { |
| 8735 | int localpos; |
| 8736 | |
| 8737 | localpos = expr_pc; |
| 8738 | assign_component (container, lhs, ind, exp, &localpos); |
| 8739 | } |
| 8740 | } |
| 8741 | ada_evaluate_subexp (NULL, exp, pos, EVAL_SKIP); |
| 8742 | } |
| 8743 | |
| 8744 | /* Add the interval [LOW .. HIGH] to the sorted set of intervals |
| 8745 | [ INDICES[0] .. INDICES[1] ],..., [ INDICES[*SIZE-2] .. INDICES[*SIZE-1] ], |
| 8746 | modifying *SIZE as needed. It is an error if *SIZE exceeds |
| 8747 | MAX_SIZE. The resulting intervals do not overlap. */ |
| 8748 | static void |
| 8749 | add_component_interval (LONGEST low, LONGEST high, |
| 8750 | LONGEST* indices, int *size, int max_size) |
| 8751 | { |
| 8752 | int i, j; |
| 8753 | |
| 8754 | for (i = 0; i < *size; i += 2) { |
| 8755 | if (high >= indices[i] && low <= indices[i + 1]) |
| 8756 | { |
| 8757 | int kh; |
| 8758 | |
| 8759 | for (kh = i + 2; kh < *size; kh += 2) |
| 8760 | if (high < indices[kh]) |
| 8761 | break; |
| 8762 | if (low < indices[i]) |
| 8763 | indices[i] = low; |
| 8764 | indices[i + 1] = indices[kh - 1]; |
| 8765 | if (high > indices[i + 1]) |
| 8766 | indices[i + 1] = high; |
| 8767 | memcpy (indices + i + 2, indices + kh, *size - kh); |
| 8768 | *size -= kh - i - 2; |
| 8769 | return; |
| 8770 | } |
| 8771 | else if (high < indices[i]) |
| 8772 | break; |
| 8773 | } |
| 8774 | |
| 8775 | if (*size == max_size) |
| 8776 | error (_("Internal error: miscounted aggregate components.")); |
| 8777 | *size += 2; |
| 8778 | for (j = *size-1; j >= i+2; j -= 1) |
| 8779 | indices[j] = indices[j - 2]; |
| 8780 | indices[i] = low; |
| 8781 | indices[i + 1] = high; |
| 8782 | } |
| 8783 | |
| 8784 | /* Perform and Ada cast of ARG2 to type TYPE if the type of ARG2 |
| 8785 | is different. */ |
| 8786 | |
| 8787 | static struct value * |
| 8788 | ada_value_cast (struct type *type, struct value *arg2, enum noside noside) |
| 8789 | { |
| 8790 | if (type == ada_check_typedef (value_type (arg2))) |
| 8791 | return arg2; |
| 8792 | |
| 8793 | if (ada_is_fixed_point_type (type)) |
| 8794 | return (cast_to_fixed (type, arg2)); |
| 8795 | |
| 8796 | if (ada_is_fixed_point_type (value_type (arg2))) |
| 8797 | return cast_from_fixed (type, arg2); |
| 8798 | |
| 8799 | return value_cast (type, arg2); |
| 8800 | } |
| 8801 | |
| 8802 | /* Evaluating Ada expressions, and printing their result. |
| 8803 | ------------------------------------------------------ |
| 8804 | |
| 8805 | 1. Introduction: |
| 8806 | ---------------- |
| 8807 | |
| 8808 | We usually evaluate an Ada expression in order to print its value. |
| 8809 | We also evaluate an expression in order to print its type, which |
| 8810 | happens during the EVAL_AVOID_SIDE_EFFECTS phase of the evaluation, |
| 8811 | but we'll focus mostly on the EVAL_NORMAL phase. In practice, the |
| 8812 | EVAL_AVOID_SIDE_EFFECTS phase allows us to simplify certain aspects of |
| 8813 | the evaluation compared to the EVAL_NORMAL, but is otherwise very |
| 8814 | similar. |
| 8815 | |
| 8816 | Evaluating expressions is a little more complicated for Ada entities |
| 8817 | than it is for entities in languages such as C. The main reason for |
| 8818 | this is that Ada provides types whose definition might be dynamic. |
| 8819 | One example of such types is variant records. Or another example |
| 8820 | would be an array whose bounds can only be known at run time. |
| 8821 | |
| 8822 | The following description is a general guide as to what should be |
| 8823 | done (and what should NOT be done) in order to evaluate an expression |
| 8824 | involving such types, and when. This does not cover how the semantic |
| 8825 | information is encoded by GNAT as this is covered separatly. For the |
| 8826 | document used as the reference for the GNAT encoding, see exp_dbug.ads |
| 8827 | in the GNAT sources. |
| 8828 | |
| 8829 | Ideally, we should embed each part of this description next to its |
| 8830 | associated code. Unfortunately, the amount of code is so vast right |
| 8831 | now that it's hard to see whether the code handling a particular |
| 8832 | situation might be duplicated or not. One day, when the code is |
| 8833 | cleaned up, this guide might become redundant with the comments |
| 8834 | inserted in the code, and we might want to remove it. |
| 8835 | |
| 8836 | 2. ``Fixing'' an Entity, the Simple Case: |
| 8837 | ----------------------------------------- |
| 8838 | |
| 8839 | When evaluating Ada expressions, the tricky issue is that they may |
| 8840 | reference entities whose type contents and size are not statically |
| 8841 | known. Consider for instance a variant record: |
| 8842 | |
| 8843 | type Rec (Empty : Boolean := True) is record |
| 8844 | case Empty is |
| 8845 | when True => null; |
| 8846 | when False => Value : Integer; |
| 8847 | end case; |
| 8848 | end record; |
| 8849 | Yes : Rec := (Empty => False, Value => 1); |
| 8850 | No : Rec := (empty => True); |
| 8851 | |
| 8852 | The size and contents of that record depends on the value of the |
| 8853 | descriminant (Rec.Empty). At this point, neither the debugging |
| 8854 | information nor the associated type structure in GDB are able to |
| 8855 | express such dynamic types. So what the debugger does is to create |
| 8856 | "fixed" versions of the type that applies to the specific object. |
| 8857 | We also informally refer to this opperation as "fixing" an object, |
| 8858 | which means creating its associated fixed type. |
| 8859 | |
| 8860 | Example: when printing the value of variable "Yes" above, its fixed |
| 8861 | type would look like this: |
| 8862 | |
| 8863 | type Rec is record |
| 8864 | Empty : Boolean; |
| 8865 | Value : Integer; |
| 8866 | end record; |
| 8867 | |
| 8868 | On the other hand, if we printed the value of "No", its fixed type |
| 8869 | would become: |
| 8870 | |
| 8871 | type Rec is record |
| 8872 | Empty : Boolean; |
| 8873 | end record; |
| 8874 | |
| 8875 | Things become a little more complicated when trying to fix an entity |
| 8876 | with a dynamic type that directly contains another dynamic type, |
| 8877 | such as an array of variant records, for instance. There are |
| 8878 | two possible cases: Arrays, and records. |
| 8879 | |
| 8880 | 3. ``Fixing'' Arrays: |
| 8881 | --------------------- |
| 8882 | |
| 8883 | The type structure in GDB describes an array in terms of its bounds, |
| 8884 | and the type of its elements. By design, all elements in the array |
| 8885 | have the same type and we cannot represent an array of variant elements |
| 8886 | using the current type structure in GDB. When fixing an array, |
| 8887 | we cannot fix the array element, as we would potentially need one |
| 8888 | fixed type per element of the array. As a result, the best we can do |
| 8889 | when fixing an array is to produce an array whose bounds and size |
| 8890 | are correct (allowing us to read it from memory), but without having |
| 8891 | touched its element type. Fixing each element will be done later, |
| 8892 | when (if) necessary. |
| 8893 | |
| 8894 | Arrays are a little simpler to handle than records, because the same |
| 8895 | amount of memory is allocated for each element of the array, even if |
| 8896 | the amount of space actually used by each element differs from element |
| 8897 | to element. Consider for instance the following array of type Rec: |
| 8898 | |
| 8899 | type Rec_Array is array (1 .. 2) of Rec; |
| 8900 | |
| 8901 | The actual amount of memory occupied by each element might be different |
| 8902 | from element to element, depending on the value of their discriminant. |
| 8903 | But the amount of space reserved for each element in the array remains |
| 8904 | fixed regardless. So we simply need to compute that size using |
| 8905 | the debugging information available, from which we can then determine |
| 8906 | the array size (we multiply the number of elements of the array by |
| 8907 | the size of each element). |
| 8908 | |
| 8909 | The simplest case is when we have an array of a constrained element |
| 8910 | type. For instance, consider the following type declarations: |
| 8911 | |
| 8912 | type Bounded_String (Max_Size : Integer) is |
| 8913 | Length : Integer; |
| 8914 | Buffer : String (1 .. Max_Size); |
| 8915 | end record; |
| 8916 | type Bounded_String_Array is array (1 ..2) of Bounded_String (80); |
| 8917 | |
| 8918 | In this case, the compiler describes the array as an array of |
| 8919 | variable-size elements (identified by its XVS suffix) for which |
| 8920 | the size can be read in the parallel XVZ variable. |
| 8921 | |
| 8922 | In the case of an array of an unconstrained element type, the compiler |
| 8923 | wraps the array element inside a private PAD type. This type should not |
| 8924 | be shown to the user, and must be "unwrap"'ed before printing. Note |
| 8925 | that we also use the adjective "aligner" in our code to designate |
| 8926 | these wrapper types. |
| 8927 | |
| 8928 | In some cases, the size allocated for each element is statically |
| 8929 | known. In that case, the PAD type already has the correct size, |
| 8930 | and the array element should remain unfixed. |
| 8931 | |
| 8932 | But there are cases when this size is not statically known. |
| 8933 | For instance, assuming that "Five" is an integer variable: |
| 8934 | |
| 8935 | type Dynamic is array (1 .. Five) of Integer; |
| 8936 | type Wrapper (Has_Length : Boolean := False) is record |
| 8937 | Data : Dynamic; |
| 8938 | case Has_Length is |
| 8939 | when True => Length : Integer; |
| 8940 | when False => null; |
| 8941 | end case; |
| 8942 | end record; |
| 8943 | type Wrapper_Array is array (1 .. 2) of Wrapper; |
| 8944 | |
| 8945 | Hello : Wrapper_Array := (others => (Has_Length => True, |
| 8946 | Data => (others => 17), |
| 8947 | Length => 1)); |
| 8948 | |
| 8949 | |
| 8950 | The debugging info would describe variable Hello as being an |
| 8951 | array of a PAD type. The size of that PAD type is not statically |
| 8952 | known, but can be determined using a parallel XVZ variable. |
| 8953 | In that case, a copy of the PAD type with the correct size should |
| 8954 | be used for the fixed array. |
| 8955 | |
| 8956 | 3. ``Fixing'' record type objects: |
| 8957 | ---------------------------------- |
| 8958 | |
| 8959 | Things are slightly different from arrays in the case of dynamic |
| 8960 | record types. In this case, in order to compute the associated |
| 8961 | fixed type, we need to determine the size and offset of each of |
| 8962 | its components. This, in turn, requires us to compute the fixed |
| 8963 | type of each of these components. |
| 8964 | |
| 8965 | Consider for instance the example: |
| 8966 | |
| 8967 | type Bounded_String (Max_Size : Natural) is record |
| 8968 | Str : String (1 .. Max_Size); |
| 8969 | Length : Natural; |
| 8970 | end record; |
| 8971 | My_String : Bounded_String (Max_Size => 10); |
| 8972 | |
| 8973 | In that case, the position of field "Length" depends on the size |
| 8974 | of field Str, which itself depends on the value of the Max_Size |
| 8975 | discriminant. In order to fix the type of variable My_String, |
| 8976 | we need to fix the type of field Str. Therefore, fixing a variant |
| 8977 | record requires us to fix each of its components. |
| 8978 | |
| 8979 | However, if a component does not have a dynamic size, the component |
| 8980 | should not be fixed. In particular, fields that use a PAD type |
| 8981 | should not fixed. Here is an example where this might happen |
| 8982 | (assuming type Rec above): |
| 8983 | |
| 8984 | type Container (Big : Boolean) is record |
| 8985 | First : Rec; |
| 8986 | After : Integer; |
| 8987 | case Big is |
| 8988 | when True => Another : Integer; |
| 8989 | when False => null; |
| 8990 | end case; |
| 8991 | end record; |
| 8992 | My_Container : Container := (Big => False, |
| 8993 | First => (Empty => True), |
| 8994 | After => 42); |
| 8995 | |
| 8996 | In that example, the compiler creates a PAD type for component First, |
| 8997 | whose size is constant, and then positions the component After just |
| 8998 | right after it. The offset of component After is therefore constant |
| 8999 | in this case. |
| 9000 | |
| 9001 | The debugger computes the position of each field based on an algorithm |
| 9002 | that uses, among other things, the actual position and size of the field |
| 9003 | preceding it. Let's now imagine that the user is trying to print |
| 9004 | the value of My_Container. If the type fixing was recursive, we would |
| 9005 | end up computing the offset of field After based on the size of the |
| 9006 | fixed version of field First. And since in our example First has |
| 9007 | only one actual field, the size of the fixed type is actually smaller |
| 9008 | than the amount of space allocated to that field, and thus we would |
| 9009 | compute the wrong offset of field After. |
| 9010 | |
| 9011 | To make things more complicated, we need to watch out for dynamic |
| 9012 | components of variant records (identified by the ___XVL suffix in |
| 9013 | the component name). Even if the target type is a PAD type, the size |
| 9014 | of that type might not be statically known. So the PAD type needs |
| 9015 | to be unwrapped and the resulting type needs to be fixed. Otherwise, |
| 9016 | we might end up with the wrong size for our component. This can be |
| 9017 | observed with the following type declarations: |
| 9018 | |
| 9019 | type Octal is new Integer range 0 .. 7; |
| 9020 | type Octal_Array is array (Positive range <>) of Octal; |
| 9021 | pragma Pack (Octal_Array); |
| 9022 | |
| 9023 | type Octal_Buffer (Size : Positive) is record |
| 9024 | Buffer : Octal_Array (1 .. Size); |
| 9025 | Length : Integer; |
| 9026 | end record; |
| 9027 | |
| 9028 | In that case, Buffer is a PAD type whose size is unset and needs |
| 9029 | to be computed by fixing the unwrapped type. |
| 9030 | |
| 9031 | 4. When to ``Fix'' un-``Fixed'' sub-elements of an entity: |
| 9032 | ---------------------------------------------------------- |
| 9033 | |
| 9034 | Lastly, when should the sub-elements of an entity that remained unfixed |
| 9035 | thus far, be actually fixed? |
| 9036 | |
| 9037 | The answer is: Only when referencing that element. For instance |
| 9038 | when selecting one component of a record, this specific component |
| 9039 | should be fixed at that point in time. Or when printing the value |
| 9040 | of a record, each component should be fixed before its value gets |
| 9041 | printed. Similarly for arrays, the element of the array should be |
| 9042 | fixed when printing each element of the array, or when extracting |
| 9043 | one element out of that array. On the other hand, fixing should |
| 9044 | not be performed on the elements when taking a slice of an array! |
| 9045 | |
| 9046 | Note that one of the side-effects of miscomputing the offset and |
| 9047 | size of each field is that we end up also miscomputing the size |
| 9048 | of the containing type. This can have adverse results when computing |
| 9049 | the value of an entity. GDB fetches the value of an entity based |
| 9050 | on the size of its type, and thus a wrong size causes GDB to fetch |
| 9051 | the wrong amount of memory. In the case where the computed size is |
| 9052 | too small, GDB fetches too little data to print the value of our |
| 9053 | entiry. Results in this case as unpredicatble, as we usually read |
| 9054 | past the buffer containing the data =:-o. */ |
| 9055 | |
| 9056 | /* Implement the evaluate_exp routine in the exp_descriptor structure |
| 9057 | for the Ada language. */ |
| 9058 | |
| 9059 | static struct value * |
| 9060 | ada_evaluate_subexp (struct type *expect_type, struct expression *exp, |
| 9061 | int *pos, enum noside noside) |
| 9062 | { |
| 9063 | enum exp_opcode op; |
| 9064 | int tem; |
| 9065 | int pc; |
| 9066 | struct value *arg1 = NULL, *arg2 = NULL, *arg3; |
| 9067 | struct type *type; |
| 9068 | int nargs, oplen; |
| 9069 | struct value **argvec; |
| 9070 | |
| 9071 | pc = *pos; |
| 9072 | *pos += 1; |
| 9073 | op = exp->elts[pc].opcode; |
| 9074 | |
| 9075 | switch (op) |
| 9076 | { |
| 9077 | default: |
| 9078 | *pos -= 1; |
| 9079 | arg1 = evaluate_subexp_standard (expect_type, exp, pos, noside); |
| 9080 | arg1 = unwrap_value (arg1); |
| 9081 | |
| 9082 | /* If evaluating an OP_DOUBLE and an EXPECT_TYPE was provided, |
| 9083 | then we need to perform the conversion manually, because |
| 9084 | evaluate_subexp_standard doesn't do it. This conversion is |
| 9085 | necessary in Ada because the different kinds of float/fixed |
| 9086 | types in Ada have different representations. |
| 9087 | |
| 9088 | Similarly, we need to perform the conversion from OP_LONG |
| 9089 | ourselves. */ |
| 9090 | if ((op == OP_DOUBLE || op == OP_LONG) && expect_type != NULL) |
| 9091 | arg1 = ada_value_cast (expect_type, arg1, noside); |
| 9092 | |
| 9093 | return arg1; |
| 9094 | |
| 9095 | case OP_STRING: |
| 9096 | { |
| 9097 | struct value *result; |
| 9098 | |
| 9099 | *pos -= 1; |
| 9100 | result = evaluate_subexp_standard (expect_type, exp, pos, noside); |
| 9101 | /* The result type will have code OP_STRING, bashed there from |
| 9102 | OP_ARRAY. Bash it back. */ |
| 9103 | if (TYPE_CODE (value_type (result)) == TYPE_CODE_STRING) |
| 9104 | TYPE_CODE (value_type (result)) = TYPE_CODE_ARRAY; |
| 9105 | return result; |
| 9106 | } |
| 9107 | |
| 9108 | case UNOP_CAST: |
| 9109 | (*pos) += 2; |
| 9110 | type = exp->elts[pc + 1].type; |
| 9111 | arg1 = evaluate_subexp (type, exp, pos, noside); |
| 9112 | if (noside == EVAL_SKIP) |
| 9113 | goto nosideret; |
| 9114 | arg1 = ada_value_cast (type, arg1, noside); |
| 9115 | return arg1; |
| 9116 | |
| 9117 | case UNOP_QUAL: |
| 9118 | (*pos) += 2; |
| 9119 | type = exp->elts[pc + 1].type; |
| 9120 | return ada_evaluate_subexp (type, exp, pos, noside); |
| 9121 | |
| 9122 | case BINOP_ASSIGN: |
| 9123 | arg1 = evaluate_subexp (NULL_TYPE, exp, pos, noside); |
| 9124 | if (exp->elts[*pos].opcode == OP_AGGREGATE) |
| 9125 | { |
| 9126 | arg1 = assign_aggregate (arg1, arg1, exp, pos, noside); |
| 9127 | if (noside == EVAL_SKIP || noside == EVAL_AVOID_SIDE_EFFECTS) |
| 9128 | return arg1; |
| 9129 | return ada_value_assign (arg1, arg1); |
| 9130 | } |
| 9131 | /* Force the evaluation of the rhs ARG2 to the type of the lhs ARG1, |
| 9132 | except if the lhs of our assignment is a convenience variable. |
| 9133 | In the case of assigning to a convenience variable, the lhs |
| 9134 | should be exactly the result of the evaluation of the rhs. */ |
| 9135 | type = value_type (arg1); |
| 9136 | if (VALUE_LVAL (arg1) == lval_internalvar) |
| 9137 | type = NULL; |
| 9138 | arg2 = evaluate_subexp (type, exp, pos, noside); |
| 9139 | if (noside == EVAL_SKIP || noside == EVAL_AVOID_SIDE_EFFECTS) |
| 9140 | return arg1; |
| 9141 | if (ada_is_fixed_point_type (value_type (arg1))) |
| 9142 | arg2 = cast_to_fixed (value_type (arg1), arg2); |
| 9143 | else if (ada_is_fixed_point_type (value_type (arg2))) |
| 9144 | error |
| 9145 | (_("Fixed-point values must be assigned to fixed-point variables")); |
| 9146 | else |
| 9147 | arg2 = coerce_for_assign (value_type (arg1), arg2); |
| 9148 | return ada_value_assign (arg1, arg2); |
| 9149 | |
| 9150 | case BINOP_ADD: |
| 9151 | arg1 = evaluate_subexp_with_coercion (exp, pos, noside); |
| 9152 | arg2 = evaluate_subexp_with_coercion (exp, pos, noside); |
| 9153 | if (noside == EVAL_SKIP) |
| 9154 | goto nosideret; |
| 9155 | if (TYPE_CODE (value_type (arg1)) == TYPE_CODE_PTR) |
| 9156 | return (value_from_longest |
| 9157 | (value_type (arg1), |
| 9158 | value_as_long (arg1) + value_as_long (arg2))); |
| 9159 | if ((ada_is_fixed_point_type (value_type (arg1)) |
| 9160 | || ada_is_fixed_point_type (value_type (arg2))) |
| 9161 | && value_type (arg1) != value_type (arg2)) |
| 9162 | error (_("Operands of fixed-point addition must have the same type")); |
| 9163 | /* Do the addition, and cast the result to the type of the first |
| 9164 | argument. We cannot cast the result to a reference type, so if |
| 9165 | ARG1 is a reference type, find its underlying type. */ |
| 9166 | type = value_type (arg1); |
| 9167 | while (TYPE_CODE (type) == TYPE_CODE_REF) |
| 9168 | type = TYPE_TARGET_TYPE (type); |
| 9169 | binop_promote (exp->language_defn, exp->gdbarch, &arg1, &arg2); |
| 9170 | return value_cast (type, value_binop (arg1, arg2, BINOP_ADD)); |
| 9171 | |
| 9172 | case BINOP_SUB: |
| 9173 | arg1 = evaluate_subexp_with_coercion (exp, pos, noside); |
| 9174 | arg2 = evaluate_subexp_with_coercion (exp, pos, noside); |
| 9175 | if (noside == EVAL_SKIP) |
| 9176 | goto nosideret; |
| 9177 | if (TYPE_CODE (value_type (arg1)) == TYPE_CODE_PTR) |
| 9178 | return (value_from_longest |
| 9179 | (value_type (arg1), |
| 9180 | value_as_long (arg1) - value_as_long (arg2))); |
| 9181 | if ((ada_is_fixed_point_type (value_type (arg1)) |
| 9182 | || ada_is_fixed_point_type (value_type (arg2))) |
| 9183 | && value_type (arg1) != value_type (arg2)) |
| 9184 | error (_("Operands of fixed-point subtraction " |
| 9185 | "must have the same type")); |
| 9186 | /* Do the substraction, and cast the result to the type of the first |
| 9187 | argument. We cannot cast the result to a reference type, so if |
| 9188 | ARG1 is a reference type, find its underlying type. */ |
| 9189 | type = value_type (arg1); |
| 9190 | while (TYPE_CODE (type) == TYPE_CODE_REF) |
| 9191 | type = TYPE_TARGET_TYPE (type); |
| 9192 | binop_promote (exp->language_defn, exp->gdbarch, &arg1, &arg2); |
| 9193 | return value_cast (type, value_binop (arg1, arg2, BINOP_SUB)); |
| 9194 | |
| 9195 | case BINOP_MUL: |
| 9196 | case BINOP_DIV: |
| 9197 | case BINOP_REM: |
| 9198 | case BINOP_MOD: |
| 9199 | arg1 = evaluate_subexp (NULL_TYPE, exp, pos, noside); |
| 9200 | arg2 = evaluate_subexp (NULL_TYPE, exp, pos, noside); |
| 9201 | if (noside == EVAL_SKIP) |
| 9202 | goto nosideret; |
| 9203 | else if (noside == EVAL_AVOID_SIDE_EFFECTS) |
| 9204 | { |
| 9205 | binop_promote (exp->language_defn, exp->gdbarch, &arg1, &arg2); |
| 9206 | return value_zero (value_type (arg1), not_lval); |
| 9207 | } |
| 9208 | else |
| 9209 | { |
| 9210 | type = builtin_type (exp->gdbarch)->builtin_double; |
| 9211 | if (ada_is_fixed_point_type (value_type (arg1))) |
| 9212 | arg1 = cast_from_fixed (type, arg1); |
| 9213 | if (ada_is_fixed_point_type (value_type (arg2))) |
| 9214 | arg2 = cast_from_fixed (type, arg2); |
| 9215 | binop_promote (exp->language_defn, exp->gdbarch, &arg1, &arg2); |
| 9216 | return ada_value_binop (arg1, arg2, op); |
| 9217 | } |
| 9218 | |
| 9219 | case BINOP_EQUAL: |
| 9220 | case BINOP_NOTEQUAL: |
| 9221 | arg1 = evaluate_subexp (NULL_TYPE, exp, pos, noside); |
| 9222 | arg2 = evaluate_subexp (value_type (arg1), exp, pos, noside); |
| 9223 | if (noside == EVAL_SKIP) |
| 9224 | goto nosideret; |
| 9225 | if (noside == EVAL_AVOID_SIDE_EFFECTS) |
| 9226 | tem = 0; |
| 9227 | else |
| 9228 | { |
| 9229 | binop_promote (exp->language_defn, exp->gdbarch, &arg1, &arg2); |
| 9230 | tem = ada_value_equal (arg1, arg2); |
| 9231 | } |
| 9232 | if (op == BINOP_NOTEQUAL) |
| 9233 | tem = !tem; |
| 9234 | type = language_bool_type (exp->language_defn, exp->gdbarch); |
| 9235 | return value_from_longest (type, (LONGEST) tem); |
| 9236 | |
| 9237 | case UNOP_NEG: |
| 9238 | arg1 = evaluate_subexp (NULL_TYPE, exp, pos, noside); |
| 9239 | if (noside == EVAL_SKIP) |
| 9240 | goto nosideret; |
| 9241 | else if (ada_is_fixed_point_type (value_type (arg1))) |
| 9242 | return value_cast (value_type (arg1), value_neg (arg1)); |
| 9243 | else |
| 9244 | { |
| 9245 | unop_promote (exp->language_defn, exp->gdbarch, &arg1); |
| 9246 | return value_neg (arg1); |
| 9247 | } |
| 9248 | |
| 9249 | case BINOP_LOGICAL_AND: |
| 9250 | case BINOP_LOGICAL_OR: |
| 9251 | case UNOP_LOGICAL_NOT: |
| 9252 | { |
| 9253 | struct value *val; |
| 9254 | |
| 9255 | *pos -= 1; |
| 9256 | val = evaluate_subexp_standard (expect_type, exp, pos, noside); |
| 9257 | type = language_bool_type (exp->language_defn, exp->gdbarch); |
| 9258 | return value_cast (type, val); |
| 9259 | } |
| 9260 | |
| 9261 | case BINOP_BITWISE_AND: |
| 9262 | case BINOP_BITWISE_IOR: |
| 9263 | case BINOP_BITWISE_XOR: |
| 9264 | { |
| 9265 | struct value *val; |
| 9266 | |
| 9267 | arg1 = evaluate_subexp (NULL_TYPE, exp, pos, EVAL_AVOID_SIDE_EFFECTS); |
| 9268 | *pos = pc; |
| 9269 | val = evaluate_subexp_standard (expect_type, exp, pos, noside); |
| 9270 | |
| 9271 | return value_cast (value_type (arg1), val); |
| 9272 | } |
| 9273 | |
| 9274 | case OP_VAR_VALUE: |
| 9275 | *pos -= 1; |
| 9276 | |
| 9277 | if (noside == EVAL_SKIP) |
| 9278 | { |
| 9279 | *pos += 4; |
| 9280 | goto nosideret; |
| 9281 | } |
| 9282 | else if (SYMBOL_DOMAIN (exp->elts[pc + 2].symbol) == UNDEF_DOMAIN) |
| 9283 | /* Only encountered when an unresolved symbol occurs in a |
| 9284 | context other than a function call, in which case, it is |
| 9285 | invalid. */ |
| 9286 | error (_("Unexpected unresolved symbol, %s, during evaluation"), |
| 9287 | SYMBOL_PRINT_NAME (exp->elts[pc + 2].symbol)); |
| 9288 | else if (noside == EVAL_AVOID_SIDE_EFFECTS) |
| 9289 | { |
| 9290 | type = static_unwrap_type (SYMBOL_TYPE (exp->elts[pc + 2].symbol)); |
| 9291 | /* Check to see if this is a tagged type. We also need to handle |
| 9292 | the case where the type is a reference to a tagged type, but |
| 9293 | we have to be careful to exclude pointers to tagged types. |
| 9294 | The latter should be shown as usual (as a pointer), whereas |
| 9295 | a reference should mostly be transparent to the user. */ |
| 9296 | if (ada_is_tagged_type (type, 0) |
| 9297 | || (TYPE_CODE(type) == TYPE_CODE_REF |
| 9298 | && ada_is_tagged_type (TYPE_TARGET_TYPE (type), 0))) |
| 9299 | { |
| 9300 | /* Tagged types are a little special in the fact that the real |
| 9301 | type is dynamic and can only be determined by inspecting the |
| 9302 | object's tag. This means that we need to get the object's |
| 9303 | value first (EVAL_NORMAL) and then extract the actual object |
| 9304 | type from its tag. |
| 9305 | |
| 9306 | Note that we cannot skip the final step where we extract |
| 9307 | the object type from its tag, because the EVAL_NORMAL phase |
| 9308 | results in dynamic components being resolved into fixed ones. |
| 9309 | This can cause problems when trying to print the type |
| 9310 | description of tagged types whose parent has a dynamic size: |
| 9311 | We use the type name of the "_parent" component in order |
| 9312 | to print the name of the ancestor type in the type description. |
| 9313 | If that component had a dynamic size, the resolution into |
| 9314 | a fixed type would result in the loss of that type name, |
| 9315 | thus preventing us from printing the name of the ancestor |
| 9316 | type in the type description. */ |
| 9317 | struct type *actual_type; |
| 9318 | |
| 9319 | arg1 = evaluate_subexp (NULL_TYPE, exp, pos, EVAL_NORMAL); |
| 9320 | actual_type = type_from_tag (ada_value_tag (arg1)); |
| 9321 | if (actual_type == NULL) |
| 9322 | /* If, for some reason, we were unable to determine |
| 9323 | the actual type from the tag, then use the static |
| 9324 | approximation that we just computed as a fallback. |
| 9325 | This can happen if the debugging information is |
| 9326 | incomplete, for instance. */ |
| 9327 | actual_type = type; |
| 9328 | |
| 9329 | return value_zero (actual_type, not_lval); |
| 9330 | } |
| 9331 | |
| 9332 | *pos += 4; |
| 9333 | return value_zero |
| 9334 | (to_static_fixed_type |
| 9335 | (static_unwrap_type (SYMBOL_TYPE (exp->elts[pc + 2].symbol))), |
| 9336 | not_lval); |
| 9337 | } |
| 9338 | else |
| 9339 | { |
| 9340 | arg1 = evaluate_subexp_standard (expect_type, exp, pos, noside); |
| 9341 | arg1 = unwrap_value (arg1); |
| 9342 | return ada_to_fixed_value (arg1); |
| 9343 | } |
| 9344 | |
| 9345 | case OP_FUNCALL: |
| 9346 | (*pos) += 2; |
| 9347 | |
| 9348 | /* Allocate arg vector, including space for the function to be |
| 9349 | called in argvec[0] and a terminating NULL. */ |
| 9350 | nargs = longest_to_int (exp->elts[pc + 1].longconst); |
| 9351 | argvec = |
| 9352 | (struct value **) alloca (sizeof (struct value *) * (nargs + 2)); |
| 9353 | |
| 9354 | if (exp->elts[*pos].opcode == OP_VAR_VALUE |
| 9355 | && SYMBOL_DOMAIN (exp->elts[pc + 5].symbol) == UNDEF_DOMAIN) |
| 9356 | error (_("Unexpected unresolved symbol, %s, during evaluation"), |
| 9357 | SYMBOL_PRINT_NAME (exp->elts[pc + 5].symbol)); |
| 9358 | else |
| 9359 | { |
| 9360 | for (tem = 0; tem <= nargs; tem += 1) |
| 9361 | argvec[tem] = evaluate_subexp (NULL_TYPE, exp, pos, noside); |
| 9362 | argvec[tem] = 0; |
| 9363 | |
| 9364 | if (noside == EVAL_SKIP) |
| 9365 | goto nosideret; |
| 9366 | } |
| 9367 | |
| 9368 | if (ada_is_constrained_packed_array_type |
| 9369 | (desc_base_type (value_type (argvec[0])))) |
| 9370 | argvec[0] = ada_coerce_to_simple_array (argvec[0]); |
| 9371 | else if (TYPE_CODE (value_type (argvec[0])) == TYPE_CODE_ARRAY |
| 9372 | && TYPE_FIELD_BITSIZE (value_type (argvec[0]), 0) != 0) |
| 9373 | /* This is a packed array that has already been fixed, and |
| 9374 | therefore already coerced to a simple array. Nothing further |
| 9375 | to do. */ |
| 9376 | ; |
| 9377 | else if (TYPE_CODE (value_type (argvec[0])) == TYPE_CODE_REF |
| 9378 | || (TYPE_CODE (value_type (argvec[0])) == TYPE_CODE_ARRAY |
| 9379 | && VALUE_LVAL (argvec[0]) == lval_memory)) |
| 9380 | argvec[0] = value_addr (argvec[0]); |
| 9381 | |
| 9382 | type = ada_check_typedef (value_type (argvec[0])); |
| 9383 | |
| 9384 | /* Ada allows us to implicitly dereference arrays when subscripting |
| 9385 | them. So, if this is an typedef (encoding use for array access |
| 9386 | types encoded as fat pointers), strip it now. */ |
| 9387 | if (TYPE_CODE (type) == TYPE_CODE_TYPEDEF) |
| 9388 | type = ada_typedef_target_type (type); |
| 9389 | |
| 9390 | if (TYPE_CODE (type) == TYPE_CODE_PTR) |
| 9391 | { |
| 9392 | switch (TYPE_CODE (ada_check_typedef (TYPE_TARGET_TYPE (type)))) |
| 9393 | { |
| 9394 | case TYPE_CODE_FUNC: |
| 9395 | type = ada_check_typedef (TYPE_TARGET_TYPE (type)); |
| 9396 | break; |
| 9397 | case TYPE_CODE_ARRAY: |
| 9398 | break; |
| 9399 | case TYPE_CODE_STRUCT: |
| 9400 | if (noside != EVAL_AVOID_SIDE_EFFECTS) |
| 9401 | argvec[0] = ada_value_ind (argvec[0]); |
| 9402 | type = ada_check_typedef (TYPE_TARGET_TYPE (type)); |
| 9403 | break; |
| 9404 | default: |
| 9405 | error (_("cannot subscript or call something of type `%s'"), |
| 9406 | ada_type_name (value_type (argvec[0]))); |
| 9407 | break; |
| 9408 | } |
| 9409 | } |
| 9410 | |
| 9411 | switch (TYPE_CODE (type)) |
| 9412 | { |
| 9413 | case TYPE_CODE_FUNC: |
| 9414 | if (noside == EVAL_AVOID_SIDE_EFFECTS) |
| 9415 | return allocate_value (TYPE_TARGET_TYPE (type)); |
| 9416 | return call_function_by_hand (argvec[0], nargs, argvec + 1); |
| 9417 | case TYPE_CODE_STRUCT: |
| 9418 | { |
| 9419 | int arity; |
| 9420 | |
| 9421 | arity = ada_array_arity (type); |
| 9422 | type = ada_array_element_type (type, nargs); |
| 9423 | if (type == NULL) |
| 9424 | error (_("cannot subscript or call a record")); |
| 9425 | if (arity != nargs) |
| 9426 | error (_("wrong number of subscripts; expecting %d"), arity); |
| 9427 | if (noside == EVAL_AVOID_SIDE_EFFECTS) |
| 9428 | return value_zero (ada_aligned_type (type), lval_memory); |
| 9429 | return |
| 9430 | unwrap_value (ada_value_subscript |
| 9431 | (argvec[0], nargs, argvec + 1)); |
| 9432 | } |
| 9433 | case TYPE_CODE_ARRAY: |
| 9434 | if (noside == EVAL_AVOID_SIDE_EFFECTS) |
| 9435 | { |
| 9436 | type = ada_array_element_type (type, nargs); |
| 9437 | if (type == NULL) |
| 9438 | error (_("element type of array unknown")); |
| 9439 | else |
| 9440 | return value_zero (ada_aligned_type (type), lval_memory); |
| 9441 | } |
| 9442 | return |
| 9443 | unwrap_value (ada_value_subscript |
| 9444 | (ada_coerce_to_simple_array (argvec[0]), |
| 9445 | nargs, argvec + 1)); |
| 9446 | case TYPE_CODE_PTR: /* Pointer to array */ |
| 9447 | type = to_fixed_array_type (TYPE_TARGET_TYPE (type), NULL, 1); |
| 9448 | if (noside == EVAL_AVOID_SIDE_EFFECTS) |
| 9449 | { |
| 9450 | type = ada_array_element_type (type, nargs); |
| 9451 | if (type == NULL) |
| 9452 | error (_("element type of array unknown")); |
| 9453 | else |
| 9454 | return value_zero (ada_aligned_type (type), lval_memory); |
| 9455 | } |
| 9456 | return |
| 9457 | unwrap_value (ada_value_ptr_subscript (argvec[0], type, |
| 9458 | nargs, argvec + 1)); |
| 9459 | |
| 9460 | default: |
| 9461 | error (_("Attempt to index or call something other than an " |
| 9462 | "array or function")); |
| 9463 | } |
| 9464 | |
| 9465 | case TERNOP_SLICE: |
| 9466 | { |
| 9467 | struct value *array = evaluate_subexp (NULL_TYPE, exp, pos, noside); |
| 9468 | struct value *low_bound_val = |
| 9469 | evaluate_subexp (NULL_TYPE, exp, pos, noside); |
| 9470 | struct value *high_bound_val = |
| 9471 | evaluate_subexp (NULL_TYPE, exp, pos, noside); |
| 9472 | LONGEST low_bound; |
| 9473 | LONGEST high_bound; |
| 9474 | |
| 9475 | low_bound_val = coerce_ref (low_bound_val); |
| 9476 | high_bound_val = coerce_ref (high_bound_val); |
| 9477 | low_bound = pos_atr (low_bound_val); |
| 9478 | high_bound = pos_atr (high_bound_val); |
| 9479 | |
| 9480 | if (noside == EVAL_SKIP) |
| 9481 | goto nosideret; |
| 9482 | |
| 9483 | /* If this is a reference to an aligner type, then remove all |
| 9484 | the aligners. */ |
| 9485 | if (TYPE_CODE (value_type (array)) == TYPE_CODE_REF |
| 9486 | && ada_is_aligner_type (TYPE_TARGET_TYPE (value_type (array)))) |
| 9487 | TYPE_TARGET_TYPE (value_type (array)) = |
| 9488 | ada_aligned_type (TYPE_TARGET_TYPE (value_type (array))); |
| 9489 | |
| 9490 | if (ada_is_constrained_packed_array_type (value_type (array))) |
| 9491 | error (_("cannot slice a packed array")); |
| 9492 | |
| 9493 | /* If this is a reference to an array or an array lvalue, |
| 9494 | convert to a pointer. */ |
| 9495 | if (TYPE_CODE (value_type (array)) == TYPE_CODE_REF |
| 9496 | || (TYPE_CODE (value_type (array)) == TYPE_CODE_ARRAY |
| 9497 | && VALUE_LVAL (array) == lval_memory)) |
| 9498 | array = value_addr (array); |
| 9499 | |
| 9500 | if (noside == EVAL_AVOID_SIDE_EFFECTS |
| 9501 | && ada_is_array_descriptor_type (ada_check_typedef |
| 9502 | (value_type (array)))) |
| 9503 | return empty_array (ada_type_of_array (array, 0), low_bound); |
| 9504 | |
| 9505 | array = ada_coerce_to_simple_array_ptr (array); |
| 9506 | |
| 9507 | /* If we have more than one level of pointer indirection, |
| 9508 | dereference the value until we get only one level. */ |
| 9509 | while (TYPE_CODE (value_type (array)) == TYPE_CODE_PTR |
| 9510 | && (TYPE_CODE (TYPE_TARGET_TYPE (value_type (array))) |
| 9511 | == TYPE_CODE_PTR)) |
| 9512 | array = value_ind (array); |
| 9513 | |
| 9514 | /* Make sure we really do have an array type before going further, |
| 9515 | to avoid a SEGV when trying to get the index type or the target |
| 9516 | type later down the road if the debug info generated by |
| 9517 | the compiler is incorrect or incomplete. */ |
| 9518 | if (!ada_is_simple_array_type (value_type (array))) |
| 9519 | error (_("cannot take slice of non-array")); |
| 9520 | |
| 9521 | if (TYPE_CODE (value_type (array)) == TYPE_CODE_PTR) |
| 9522 | { |
| 9523 | if (high_bound < low_bound || noside == EVAL_AVOID_SIDE_EFFECTS) |
| 9524 | return empty_array (TYPE_TARGET_TYPE (value_type (array)), |
| 9525 | low_bound); |
| 9526 | else |
| 9527 | { |
| 9528 | struct type *arr_type0 = |
| 9529 | to_fixed_array_type (TYPE_TARGET_TYPE (value_type (array)), |
| 9530 | NULL, 1); |
| 9531 | |
| 9532 | return ada_value_slice_from_ptr (array, arr_type0, |
| 9533 | longest_to_int (low_bound), |
| 9534 | longest_to_int (high_bound)); |
| 9535 | } |
| 9536 | } |
| 9537 | else if (noside == EVAL_AVOID_SIDE_EFFECTS) |
| 9538 | return array; |
| 9539 | else if (high_bound < low_bound) |
| 9540 | return empty_array (value_type (array), low_bound); |
| 9541 | else |
| 9542 | return ada_value_slice (array, longest_to_int (low_bound), |
| 9543 | longest_to_int (high_bound)); |
| 9544 | } |
| 9545 | |
| 9546 | case UNOP_IN_RANGE: |
| 9547 | (*pos) += 2; |
| 9548 | arg1 = evaluate_subexp (NULL_TYPE, exp, pos, noside); |
| 9549 | type = check_typedef (exp->elts[pc + 1].type); |
| 9550 | |
| 9551 | if (noside == EVAL_SKIP) |
| 9552 | goto nosideret; |
| 9553 | |
| 9554 | switch (TYPE_CODE (type)) |
| 9555 | { |
| 9556 | default: |
| 9557 | lim_warning (_("Membership test incompletely implemented; " |
| 9558 | "always returns true")); |
| 9559 | type = language_bool_type (exp->language_defn, exp->gdbarch); |
| 9560 | return value_from_longest (type, (LONGEST) 1); |
| 9561 | |
| 9562 | case TYPE_CODE_RANGE: |
| 9563 | arg2 = value_from_longest (type, TYPE_LOW_BOUND (type)); |
| 9564 | arg3 = value_from_longest (type, TYPE_HIGH_BOUND (type)); |
| 9565 | binop_promote (exp->language_defn, exp->gdbarch, &arg1, &arg2); |
| 9566 | binop_promote (exp->language_defn, exp->gdbarch, &arg1, &arg3); |
| 9567 | type = language_bool_type (exp->language_defn, exp->gdbarch); |
| 9568 | return |
| 9569 | value_from_longest (type, |
| 9570 | (value_less (arg1, arg3) |
| 9571 | || value_equal (arg1, arg3)) |
| 9572 | && (value_less (arg2, arg1) |
| 9573 | || value_equal (arg2, arg1))); |
| 9574 | } |
| 9575 | |
| 9576 | case BINOP_IN_BOUNDS: |
| 9577 | (*pos) += 2; |
| 9578 | arg1 = evaluate_subexp (NULL_TYPE, exp, pos, noside); |
| 9579 | arg2 = evaluate_subexp (NULL_TYPE, exp, pos, noside); |
| 9580 | |
| 9581 | if (noside == EVAL_SKIP) |
| 9582 | goto nosideret; |
| 9583 | |
| 9584 | if (noside == EVAL_AVOID_SIDE_EFFECTS) |
| 9585 | { |
| 9586 | type = language_bool_type (exp->language_defn, exp->gdbarch); |
| 9587 | return value_zero (type, not_lval); |
| 9588 | } |
| 9589 | |
| 9590 | tem = longest_to_int (exp->elts[pc + 1].longconst); |
| 9591 | |
| 9592 | type = ada_index_type (value_type (arg2), tem, "range"); |
| 9593 | if (!type) |
| 9594 | type = value_type (arg1); |
| 9595 | |
| 9596 | arg3 = value_from_longest (type, ada_array_bound (arg2, tem, 1)); |
| 9597 | arg2 = value_from_longest (type, ada_array_bound (arg2, tem, 0)); |
| 9598 | |
| 9599 | binop_promote (exp->language_defn, exp->gdbarch, &arg1, &arg2); |
| 9600 | binop_promote (exp->language_defn, exp->gdbarch, &arg1, &arg3); |
| 9601 | type = language_bool_type (exp->language_defn, exp->gdbarch); |
| 9602 | return |
| 9603 | value_from_longest (type, |
| 9604 | (value_less (arg1, arg3) |
| 9605 | || value_equal (arg1, arg3)) |
| 9606 | && (value_less (arg2, arg1) |
| 9607 | || value_equal (arg2, arg1))); |
| 9608 | |
| 9609 | case TERNOP_IN_RANGE: |
| 9610 | arg1 = evaluate_subexp (NULL_TYPE, exp, pos, noside); |
| 9611 | arg2 = evaluate_subexp (NULL_TYPE, exp, pos, noside); |
| 9612 | arg3 = evaluate_subexp (NULL_TYPE, exp, pos, noside); |
| 9613 | |
| 9614 | if (noside == EVAL_SKIP) |
| 9615 | goto nosideret; |
| 9616 | |
| 9617 | binop_promote (exp->language_defn, exp->gdbarch, &arg1, &arg2); |
| 9618 | binop_promote (exp->language_defn, exp->gdbarch, &arg1, &arg3); |
| 9619 | type = language_bool_type (exp->language_defn, exp->gdbarch); |
| 9620 | return |
| 9621 | value_from_longest (type, |
| 9622 | (value_less (arg1, arg3) |
| 9623 | || value_equal (arg1, arg3)) |
| 9624 | && (value_less (arg2, arg1) |
| 9625 | || value_equal (arg2, arg1))); |
| 9626 | |
| 9627 | case OP_ATR_FIRST: |
| 9628 | case OP_ATR_LAST: |
| 9629 | case OP_ATR_LENGTH: |
| 9630 | { |
| 9631 | struct type *type_arg; |
| 9632 | |
| 9633 | if (exp->elts[*pos].opcode == OP_TYPE) |
| 9634 | { |
| 9635 | evaluate_subexp (NULL_TYPE, exp, pos, EVAL_SKIP); |
| 9636 | arg1 = NULL; |
| 9637 | type_arg = check_typedef (exp->elts[pc + 2].type); |
| 9638 | } |
| 9639 | else |
| 9640 | { |
| 9641 | arg1 = evaluate_subexp (NULL_TYPE, exp, pos, noside); |
| 9642 | type_arg = NULL; |
| 9643 | } |
| 9644 | |
| 9645 | if (exp->elts[*pos].opcode != OP_LONG) |
| 9646 | error (_("Invalid operand to '%s"), ada_attribute_name (op)); |
| 9647 | tem = longest_to_int (exp->elts[*pos + 2].longconst); |
| 9648 | *pos += 4; |
| 9649 | |
| 9650 | if (noside == EVAL_SKIP) |
| 9651 | goto nosideret; |
| 9652 | |
| 9653 | if (type_arg == NULL) |
| 9654 | { |
| 9655 | arg1 = ada_coerce_ref (arg1); |
| 9656 | |
| 9657 | if (ada_is_constrained_packed_array_type (value_type (arg1))) |
| 9658 | arg1 = ada_coerce_to_simple_array (arg1); |
| 9659 | |
| 9660 | type = ada_index_type (value_type (arg1), tem, |
| 9661 | ada_attribute_name (op)); |
| 9662 | if (type == NULL) |
| 9663 | type = builtin_type (exp->gdbarch)->builtin_int; |
| 9664 | |
| 9665 | if (noside == EVAL_AVOID_SIDE_EFFECTS) |
| 9666 | return allocate_value (type); |
| 9667 | |
| 9668 | switch (op) |
| 9669 | { |
| 9670 | default: /* Should never happen. */ |
| 9671 | error (_("unexpected attribute encountered")); |
| 9672 | case OP_ATR_FIRST: |
| 9673 | return value_from_longest |
| 9674 | (type, ada_array_bound (arg1, tem, 0)); |
| 9675 | case OP_ATR_LAST: |
| 9676 | return value_from_longest |
| 9677 | (type, ada_array_bound (arg1, tem, 1)); |
| 9678 | case OP_ATR_LENGTH: |
| 9679 | return value_from_longest |
| 9680 | (type, ada_array_length (arg1, tem)); |
| 9681 | } |
| 9682 | } |
| 9683 | else if (discrete_type_p (type_arg)) |
| 9684 | { |
| 9685 | struct type *range_type; |
| 9686 | char *name = ada_type_name (type_arg); |
| 9687 | |
| 9688 | range_type = NULL; |
| 9689 | if (name != NULL && TYPE_CODE (type_arg) != TYPE_CODE_ENUM) |
| 9690 | range_type = to_fixed_range_type (type_arg, NULL); |
| 9691 | if (range_type == NULL) |
| 9692 | range_type = type_arg; |
| 9693 | switch (op) |
| 9694 | { |
| 9695 | default: |
| 9696 | error (_("unexpected attribute encountered")); |
| 9697 | case OP_ATR_FIRST: |
| 9698 | return value_from_longest |
| 9699 | (range_type, ada_discrete_type_low_bound (range_type)); |
| 9700 | case OP_ATR_LAST: |
| 9701 | return value_from_longest |
| 9702 | (range_type, ada_discrete_type_high_bound (range_type)); |
| 9703 | case OP_ATR_LENGTH: |
| 9704 | error (_("the 'length attribute applies only to array types")); |
| 9705 | } |
| 9706 | } |
| 9707 | else if (TYPE_CODE (type_arg) == TYPE_CODE_FLT) |
| 9708 | error (_("unimplemented type attribute")); |
| 9709 | else |
| 9710 | { |
| 9711 | LONGEST low, high; |
| 9712 | |
| 9713 | if (ada_is_constrained_packed_array_type (type_arg)) |
| 9714 | type_arg = decode_constrained_packed_array_type (type_arg); |
| 9715 | |
| 9716 | type = ada_index_type (type_arg, tem, ada_attribute_name (op)); |
| 9717 | if (type == NULL) |
| 9718 | type = builtin_type (exp->gdbarch)->builtin_int; |
| 9719 | |
| 9720 | if (noside == EVAL_AVOID_SIDE_EFFECTS) |
| 9721 | return allocate_value (type); |
| 9722 | |
| 9723 | switch (op) |
| 9724 | { |
| 9725 | default: |
| 9726 | error (_("unexpected attribute encountered")); |
| 9727 | case OP_ATR_FIRST: |
| 9728 | low = ada_array_bound_from_type (type_arg, tem, 0); |
| 9729 | return value_from_longest (type, low); |
| 9730 | case OP_ATR_LAST: |
| 9731 | high = ada_array_bound_from_type (type_arg, tem, 1); |
| 9732 | return value_from_longest (type, high); |
| 9733 | case OP_ATR_LENGTH: |
| 9734 | low = ada_array_bound_from_type (type_arg, tem, 0); |
| 9735 | high = ada_array_bound_from_type (type_arg, tem, 1); |
| 9736 | return value_from_longest (type, high - low + 1); |
| 9737 | } |
| 9738 | } |
| 9739 | } |
| 9740 | |
| 9741 | case OP_ATR_TAG: |
| 9742 | arg1 = evaluate_subexp (NULL_TYPE, exp, pos, noside); |
| 9743 | if (noside == EVAL_SKIP) |
| 9744 | goto nosideret; |
| 9745 | |
| 9746 | if (noside == EVAL_AVOID_SIDE_EFFECTS) |
| 9747 | return value_zero (ada_tag_type (arg1), not_lval); |
| 9748 | |
| 9749 | return ada_value_tag (arg1); |
| 9750 | |
| 9751 | case OP_ATR_MIN: |
| 9752 | case OP_ATR_MAX: |
| 9753 | evaluate_subexp (NULL_TYPE, exp, pos, EVAL_SKIP); |
| 9754 | arg1 = evaluate_subexp (NULL_TYPE, exp, pos, noside); |
| 9755 | arg2 = evaluate_subexp (NULL_TYPE, exp, pos, noside); |
| 9756 | if (noside == EVAL_SKIP) |
| 9757 | goto nosideret; |
| 9758 | else if (noside == EVAL_AVOID_SIDE_EFFECTS) |
| 9759 | return value_zero (value_type (arg1), not_lval); |
| 9760 | else |
| 9761 | { |
| 9762 | binop_promote (exp->language_defn, exp->gdbarch, &arg1, &arg2); |
| 9763 | return value_binop (arg1, arg2, |
| 9764 | op == OP_ATR_MIN ? BINOP_MIN : BINOP_MAX); |
| 9765 | } |
| 9766 | |
| 9767 | case OP_ATR_MODULUS: |
| 9768 | { |
| 9769 | struct type *type_arg = check_typedef (exp->elts[pc + 2].type); |
| 9770 | |
| 9771 | evaluate_subexp (NULL_TYPE, exp, pos, EVAL_SKIP); |
| 9772 | if (noside == EVAL_SKIP) |
| 9773 | goto nosideret; |
| 9774 | |
| 9775 | if (!ada_is_modular_type (type_arg)) |
| 9776 | error (_("'modulus must be applied to modular type")); |
| 9777 | |
| 9778 | return value_from_longest (TYPE_TARGET_TYPE (type_arg), |
| 9779 | ada_modulus (type_arg)); |
| 9780 | } |
| 9781 | |
| 9782 | |
| 9783 | case OP_ATR_POS: |
| 9784 | evaluate_subexp (NULL_TYPE, exp, pos, EVAL_SKIP); |
| 9785 | arg1 = evaluate_subexp (NULL_TYPE, exp, pos, noside); |
| 9786 | if (noside == EVAL_SKIP) |
| 9787 | goto nosideret; |
| 9788 | type = builtin_type (exp->gdbarch)->builtin_int; |
| 9789 | if (noside == EVAL_AVOID_SIDE_EFFECTS) |
| 9790 | return value_zero (type, not_lval); |
| 9791 | else |
| 9792 | return value_pos_atr (type, arg1); |
| 9793 | |
| 9794 | case OP_ATR_SIZE: |
| 9795 | arg1 = evaluate_subexp (NULL_TYPE, exp, pos, noside); |
| 9796 | type = value_type (arg1); |
| 9797 | |
| 9798 | /* If the argument is a reference, then dereference its type, since |
| 9799 | the user is really asking for the size of the actual object, |
| 9800 | not the size of the pointer. */ |
| 9801 | if (TYPE_CODE (type) == TYPE_CODE_REF) |
| 9802 | type = TYPE_TARGET_TYPE (type); |
| 9803 | |
| 9804 | if (noside == EVAL_SKIP) |
| 9805 | goto nosideret; |
| 9806 | else if (noside == EVAL_AVOID_SIDE_EFFECTS) |
| 9807 | return value_zero (builtin_type (exp->gdbarch)->builtin_int, not_lval); |
| 9808 | else |
| 9809 | return value_from_longest (builtin_type (exp->gdbarch)->builtin_int, |
| 9810 | TARGET_CHAR_BIT * TYPE_LENGTH (type)); |
| 9811 | |
| 9812 | case OP_ATR_VAL: |
| 9813 | evaluate_subexp (NULL_TYPE, exp, pos, EVAL_SKIP); |
| 9814 | arg1 = evaluate_subexp (NULL_TYPE, exp, pos, noside); |
| 9815 | type = exp->elts[pc + 2].type; |
| 9816 | if (noside == EVAL_SKIP) |
| 9817 | goto nosideret; |
| 9818 | else if (noside == EVAL_AVOID_SIDE_EFFECTS) |
| 9819 | return value_zero (type, not_lval); |
| 9820 | else |
| 9821 | return value_val_atr (type, arg1); |
| 9822 | |
| 9823 | case BINOP_EXP: |
| 9824 | arg1 = evaluate_subexp (NULL_TYPE, exp, pos, noside); |
| 9825 | arg2 = evaluate_subexp (NULL_TYPE, exp, pos, noside); |
| 9826 | if (noside == EVAL_SKIP) |
| 9827 | goto nosideret; |
| 9828 | else if (noside == EVAL_AVOID_SIDE_EFFECTS) |
| 9829 | return value_zero (value_type (arg1), not_lval); |
| 9830 | else |
| 9831 | { |
| 9832 | /* For integer exponentiation operations, |
| 9833 | only promote the first argument. */ |
| 9834 | if (is_integral_type (value_type (arg2))) |
| 9835 | unop_promote (exp->language_defn, exp->gdbarch, &arg1); |
| 9836 | else |
| 9837 | binop_promote (exp->language_defn, exp->gdbarch, &arg1, &arg2); |
| 9838 | |
| 9839 | return value_binop (arg1, arg2, op); |
| 9840 | } |
| 9841 | |
| 9842 | case UNOP_PLUS: |
| 9843 | arg1 = evaluate_subexp (NULL_TYPE, exp, pos, noside); |
| 9844 | if (noside == EVAL_SKIP) |
| 9845 | goto nosideret; |
| 9846 | else |
| 9847 | return arg1; |
| 9848 | |
| 9849 | case UNOP_ABS: |
| 9850 | arg1 = evaluate_subexp (NULL_TYPE, exp, pos, noside); |
| 9851 | if (noside == EVAL_SKIP) |
| 9852 | goto nosideret; |
| 9853 | unop_promote (exp->language_defn, exp->gdbarch, &arg1); |
| 9854 | if (value_less (arg1, value_zero (value_type (arg1), not_lval))) |
| 9855 | return value_neg (arg1); |
| 9856 | else |
| 9857 | return arg1; |
| 9858 | |
| 9859 | case UNOP_IND: |
| 9860 | arg1 = evaluate_subexp (NULL_TYPE, exp, pos, noside); |
| 9861 | if (noside == EVAL_SKIP) |
| 9862 | goto nosideret; |
| 9863 | type = ada_check_typedef (value_type (arg1)); |
| 9864 | if (noside == EVAL_AVOID_SIDE_EFFECTS) |
| 9865 | { |
| 9866 | if (ada_is_array_descriptor_type (type)) |
| 9867 | /* GDB allows dereferencing GNAT array descriptors. */ |
| 9868 | { |
| 9869 | struct type *arrType = ada_type_of_array (arg1, 0); |
| 9870 | |
| 9871 | if (arrType == NULL) |
| 9872 | error (_("Attempt to dereference null array pointer.")); |
| 9873 | return value_at_lazy (arrType, 0); |
| 9874 | } |
| 9875 | else if (TYPE_CODE (type) == TYPE_CODE_PTR |
| 9876 | || TYPE_CODE (type) == TYPE_CODE_REF |
| 9877 | /* In C you can dereference an array to get the 1st elt. */ |
| 9878 | || TYPE_CODE (type) == TYPE_CODE_ARRAY) |
| 9879 | { |
| 9880 | type = to_static_fixed_type |
| 9881 | (ada_aligned_type |
| 9882 | (ada_check_typedef (TYPE_TARGET_TYPE (type)))); |
| 9883 | check_size (type); |
| 9884 | return value_zero (type, lval_memory); |
| 9885 | } |
| 9886 | else if (TYPE_CODE (type) == TYPE_CODE_INT) |
| 9887 | { |
| 9888 | /* GDB allows dereferencing an int. */ |
| 9889 | if (expect_type == NULL) |
| 9890 | return value_zero (builtin_type (exp->gdbarch)->builtin_int, |
| 9891 | lval_memory); |
| 9892 | else |
| 9893 | { |
| 9894 | expect_type = |
| 9895 | to_static_fixed_type (ada_aligned_type (expect_type)); |
| 9896 | return value_zero (expect_type, lval_memory); |
| 9897 | } |
| 9898 | } |
| 9899 | else |
| 9900 | error (_("Attempt to take contents of a non-pointer value.")); |
| 9901 | } |
| 9902 | arg1 = ada_coerce_ref (arg1); /* FIXME: What is this for?? */ |
| 9903 | type = ada_check_typedef (value_type (arg1)); |
| 9904 | |
| 9905 | if (TYPE_CODE (type) == TYPE_CODE_INT) |
| 9906 | /* GDB allows dereferencing an int. If we were given |
| 9907 | the expect_type, then use that as the target type. |
| 9908 | Otherwise, assume that the target type is an int. */ |
| 9909 | { |
| 9910 | if (expect_type != NULL) |
| 9911 | return ada_value_ind (value_cast (lookup_pointer_type (expect_type), |
| 9912 | arg1)); |
| 9913 | else |
| 9914 | return value_at_lazy (builtin_type (exp->gdbarch)->builtin_int, |
| 9915 | (CORE_ADDR) value_as_address (arg1)); |
| 9916 | } |
| 9917 | |
| 9918 | if (ada_is_array_descriptor_type (type)) |
| 9919 | /* GDB allows dereferencing GNAT array descriptors. */ |
| 9920 | return ada_coerce_to_simple_array (arg1); |
| 9921 | else |
| 9922 | return ada_value_ind (arg1); |
| 9923 | |
| 9924 | case STRUCTOP_STRUCT: |
| 9925 | tem = longest_to_int (exp->elts[pc + 1].longconst); |
| 9926 | (*pos) += 3 + BYTES_TO_EXP_ELEM (tem + 1); |
| 9927 | arg1 = evaluate_subexp (NULL_TYPE, exp, pos, noside); |
| 9928 | if (noside == EVAL_SKIP) |
| 9929 | goto nosideret; |
| 9930 | if (noside == EVAL_AVOID_SIDE_EFFECTS) |
| 9931 | { |
| 9932 | struct type *type1 = value_type (arg1); |
| 9933 | |
| 9934 | if (ada_is_tagged_type (type1, 1)) |
| 9935 | { |
| 9936 | type = ada_lookup_struct_elt_type (type1, |
| 9937 | &exp->elts[pc + 2].string, |
| 9938 | 1, 1, NULL); |
| 9939 | if (type == NULL) |
| 9940 | /* In this case, we assume that the field COULD exist |
| 9941 | in some extension of the type. Return an object of |
| 9942 | "type" void, which will match any formal |
| 9943 | (see ada_type_match). */ |
| 9944 | return value_zero (builtin_type (exp->gdbarch)->builtin_void, |
| 9945 | lval_memory); |
| 9946 | } |
| 9947 | else |
| 9948 | type = |
| 9949 | ada_lookup_struct_elt_type (type1, &exp->elts[pc + 2].string, 1, |
| 9950 | 0, NULL); |
| 9951 | |
| 9952 | return value_zero (ada_aligned_type (type), lval_memory); |
| 9953 | } |
| 9954 | else |
| 9955 | arg1 = ada_value_struct_elt (arg1, &exp->elts[pc + 2].string, 0); |
| 9956 | arg1 = unwrap_value (arg1); |
| 9957 | return ada_to_fixed_value (arg1); |
| 9958 | |
| 9959 | case OP_TYPE: |
| 9960 | /* The value is not supposed to be used. This is here to make it |
| 9961 | easier to accommodate expressions that contain types. */ |
| 9962 | (*pos) += 2; |
| 9963 | if (noside == EVAL_SKIP) |
| 9964 | goto nosideret; |
| 9965 | else if (noside == EVAL_AVOID_SIDE_EFFECTS) |
| 9966 | return allocate_value (exp->elts[pc + 1].type); |
| 9967 | else |
| 9968 | error (_("Attempt to use a type name as an expression")); |
| 9969 | |
| 9970 | case OP_AGGREGATE: |
| 9971 | case OP_CHOICES: |
| 9972 | case OP_OTHERS: |
| 9973 | case OP_DISCRETE_RANGE: |
| 9974 | case OP_POSITIONAL: |
| 9975 | case OP_NAME: |
| 9976 | if (noside == EVAL_NORMAL) |
| 9977 | switch (op) |
| 9978 | { |
| 9979 | case OP_NAME: |
| 9980 | error (_("Undefined name, ambiguous name, or renaming used in " |
| 9981 | "component association: %s."), &exp->elts[pc+2].string); |
| 9982 | case OP_AGGREGATE: |
| 9983 | error (_("Aggregates only allowed on the right of an assignment")); |
| 9984 | default: |
| 9985 | internal_error (__FILE__, __LINE__, |
| 9986 | _("aggregate apparently mangled")); |
| 9987 | } |
| 9988 | |
| 9989 | ada_forward_operator_length (exp, pc, &oplen, &nargs); |
| 9990 | *pos += oplen - 1; |
| 9991 | for (tem = 0; tem < nargs; tem += 1) |
| 9992 | ada_evaluate_subexp (NULL, exp, pos, noside); |
| 9993 | goto nosideret; |
| 9994 | } |
| 9995 | |
| 9996 | nosideret: |
| 9997 | return value_from_longest (builtin_type (exp->gdbarch)->builtin_int, 1); |
| 9998 | } |
| 9999 | \f |
| 10000 | |
| 10001 | /* Fixed point */ |
| 10002 | |
| 10003 | /* If TYPE encodes an Ada fixed-point type, return the suffix of the |
| 10004 | type name that encodes the 'small and 'delta information. |
| 10005 | Otherwise, return NULL. */ |
| 10006 | |
| 10007 | static const char * |
| 10008 | fixed_type_info (struct type *type) |
| 10009 | { |
| 10010 | const char *name = ada_type_name (type); |
| 10011 | enum type_code code = (type == NULL) ? TYPE_CODE_UNDEF : TYPE_CODE (type); |
| 10012 | |
| 10013 | if ((code == TYPE_CODE_INT || code == TYPE_CODE_RANGE) && name != NULL) |
| 10014 | { |
| 10015 | const char *tail = strstr (name, "___XF_"); |
| 10016 | |
| 10017 | if (tail == NULL) |
| 10018 | return NULL; |
| 10019 | else |
| 10020 | return tail + 5; |
| 10021 | } |
| 10022 | else if (code == TYPE_CODE_RANGE && TYPE_TARGET_TYPE (type) != type) |
| 10023 | return fixed_type_info (TYPE_TARGET_TYPE (type)); |
| 10024 | else |
| 10025 | return NULL; |
| 10026 | } |
| 10027 | |
| 10028 | /* Returns non-zero iff TYPE represents an Ada fixed-point type. */ |
| 10029 | |
| 10030 | int |
| 10031 | ada_is_fixed_point_type (struct type *type) |
| 10032 | { |
| 10033 | return fixed_type_info (type) != NULL; |
| 10034 | } |
| 10035 | |
| 10036 | /* Return non-zero iff TYPE represents a System.Address type. */ |
| 10037 | |
| 10038 | int |
| 10039 | ada_is_system_address_type (struct type *type) |
| 10040 | { |
| 10041 | return (TYPE_NAME (type) |
| 10042 | && strcmp (TYPE_NAME (type), "system__address") == 0); |
| 10043 | } |
| 10044 | |
| 10045 | /* Assuming that TYPE is the representation of an Ada fixed-point |
| 10046 | type, return its delta, or -1 if the type is malformed and the |
| 10047 | delta cannot be determined. */ |
| 10048 | |
| 10049 | DOUBLEST |
| 10050 | ada_delta (struct type *type) |
| 10051 | { |
| 10052 | const char *encoding = fixed_type_info (type); |
| 10053 | DOUBLEST num, den; |
| 10054 | |
| 10055 | /* Strictly speaking, num and den are encoded as integer. However, |
| 10056 | they may not fit into a long, and they will have to be converted |
| 10057 | to DOUBLEST anyway. So scan them as DOUBLEST. */ |
| 10058 | if (sscanf (encoding, "_%" DOUBLEST_SCAN_FORMAT "_%" DOUBLEST_SCAN_FORMAT, |
| 10059 | &num, &den) < 2) |
| 10060 | return -1.0; |
| 10061 | else |
| 10062 | return num / den; |
| 10063 | } |
| 10064 | |
| 10065 | /* Assuming that ada_is_fixed_point_type (TYPE), return the scaling |
| 10066 | factor ('SMALL value) associated with the type. */ |
| 10067 | |
| 10068 | static DOUBLEST |
| 10069 | scaling_factor (struct type *type) |
| 10070 | { |
| 10071 | const char *encoding = fixed_type_info (type); |
| 10072 | DOUBLEST num0, den0, num1, den1; |
| 10073 | int n; |
| 10074 | |
| 10075 | /* Strictly speaking, num's and den's are encoded as integer. However, |
| 10076 | they may not fit into a long, and they will have to be converted |
| 10077 | to DOUBLEST anyway. So scan them as DOUBLEST. */ |
| 10078 | n = sscanf (encoding, |
| 10079 | "_%" DOUBLEST_SCAN_FORMAT "_%" DOUBLEST_SCAN_FORMAT |
| 10080 | "_%" DOUBLEST_SCAN_FORMAT "_%" DOUBLEST_SCAN_FORMAT, |
| 10081 | &num0, &den0, &num1, &den1); |
| 10082 | |
| 10083 | if (n < 2) |
| 10084 | return 1.0; |
| 10085 | else if (n == 4) |
| 10086 | return num1 / den1; |
| 10087 | else |
| 10088 | return num0 / den0; |
| 10089 | } |
| 10090 | |
| 10091 | |
| 10092 | /* Assuming that X is the representation of a value of fixed-point |
| 10093 | type TYPE, return its floating-point equivalent. */ |
| 10094 | |
| 10095 | DOUBLEST |
| 10096 | ada_fixed_to_float (struct type *type, LONGEST x) |
| 10097 | { |
| 10098 | return (DOUBLEST) x *scaling_factor (type); |
| 10099 | } |
| 10100 | |
| 10101 | /* The representation of a fixed-point value of type TYPE |
| 10102 | corresponding to the value X. */ |
| 10103 | |
| 10104 | LONGEST |
| 10105 | ada_float_to_fixed (struct type *type, DOUBLEST x) |
| 10106 | { |
| 10107 | return (LONGEST) (x / scaling_factor (type) + 0.5); |
| 10108 | } |
| 10109 | |
| 10110 | \f |
| 10111 | |
| 10112 | /* Range types */ |
| 10113 | |
| 10114 | /* Scan STR beginning at position K for a discriminant name, and |
| 10115 | return the value of that discriminant field of DVAL in *PX. If |
| 10116 | PNEW_K is not null, put the position of the character beyond the |
| 10117 | name scanned in *PNEW_K. Return 1 if successful; return 0 and do |
| 10118 | not alter *PX and *PNEW_K if unsuccessful. */ |
| 10119 | |
| 10120 | static int |
| 10121 | scan_discrim_bound (char *str, int k, struct value *dval, LONGEST * px, |
| 10122 | int *pnew_k) |
| 10123 | { |
| 10124 | static char *bound_buffer = NULL; |
| 10125 | static size_t bound_buffer_len = 0; |
| 10126 | char *bound; |
| 10127 | char *pend; |
| 10128 | struct value *bound_val; |
| 10129 | |
| 10130 | if (dval == NULL || str == NULL || str[k] == '\0') |
| 10131 | return 0; |
| 10132 | |
| 10133 | pend = strstr (str + k, "__"); |
| 10134 | if (pend == NULL) |
| 10135 | { |
| 10136 | bound = str + k; |
| 10137 | k += strlen (bound); |
| 10138 | } |
| 10139 | else |
| 10140 | { |
| 10141 | GROW_VECT (bound_buffer, bound_buffer_len, pend - (str + k) + 1); |
| 10142 | bound = bound_buffer; |
| 10143 | strncpy (bound_buffer, str + k, pend - (str + k)); |
| 10144 | bound[pend - (str + k)] = '\0'; |
| 10145 | k = pend - str; |
| 10146 | } |
| 10147 | |
| 10148 | bound_val = ada_search_struct_field (bound, dval, 0, value_type (dval)); |
| 10149 | if (bound_val == NULL) |
| 10150 | return 0; |
| 10151 | |
| 10152 | *px = value_as_long (bound_val); |
| 10153 | if (pnew_k != NULL) |
| 10154 | *pnew_k = k; |
| 10155 | return 1; |
| 10156 | } |
| 10157 | |
| 10158 | /* Value of variable named NAME in the current environment. If |
| 10159 | no such variable found, then if ERR_MSG is null, returns 0, and |
| 10160 | otherwise causes an error with message ERR_MSG. */ |
| 10161 | |
| 10162 | static struct value * |
| 10163 | get_var_value (char *name, char *err_msg) |
| 10164 | { |
| 10165 | struct ada_symbol_info *syms; |
| 10166 | int nsyms; |
| 10167 | |
| 10168 | nsyms = ada_lookup_symbol_list (name, get_selected_block (0), VAR_DOMAIN, |
| 10169 | &syms); |
| 10170 | |
| 10171 | if (nsyms != 1) |
| 10172 | { |
| 10173 | if (err_msg == NULL) |
| 10174 | return 0; |
| 10175 | else |
| 10176 | error (("%s"), err_msg); |
| 10177 | } |
| 10178 | |
| 10179 | return value_of_variable (syms[0].sym, syms[0].block); |
| 10180 | } |
| 10181 | |
| 10182 | /* Value of integer variable named NAME in the current environment. If |
| 10183 | no such variable found, returns 0, and sets *FLAG to 0. If |
| 10184 | successful, sets *FLAG to 1. */ |
| 10185 | |
| 10186 | LONGEST |
| 10187 | get_int_var_value (char *name, int *flag) |
| 10188 | { |
| 10189 | struct value *var_val = get_var_value (name, 0); |
| 10190 | |
| 10191 | if (var_val == 0) |
| 10192 | { |
| 10193 | if (flag != NULL) |
| 10194 | *flag = 0; |
| 10195 | return 0; |
| 10196 | } |
| 10197 | else |
| 10198 | { |
| 10199 | if (flag != NULL) |
| 10200 | *flag = 1; |
| 10201 | return value_as_long (var_val); |
| 10202 | } |
| 10203 | } |
| 10204 | |
| 10205 | |
| 10206 | /* Return a range type whose base type is that of the range type named |
| 10207 | NAME in the current environment, and whose bounds are calculated |
| 10208 | from NAME according to the GNAT range encoding conventions. |
| 10209 | Extract discriminant values, if needed, from DVAL. ORIG_TYPE is the |
| 10210 | corresponding range type from debug information; fall back to using it |
| 10211 | if symbol lookup fails. If a new type must be created, allocate it |
| 10212 | like ORIG_TYPE was. The bounds information, in general, is encoded |
| 10213 | in NAME, the base type given in the named range type. */ |
| 10214 | |
| 10215 | static struct type * |
| 10216 | to_fixed_range_type (struct type *raw_type, struct value *dval) |
| 10217 | { |
| 10218 | char *name; |
| 10219 | struct type *base_type; |
| 10220 | char *subtype_info; |
| 10221 | |
| 10222 | gdb_assert (raw_type != NULL); |
| 10223 | gdb_assert (TYPE_NAME (raw_type) != NULL); |
| 10224 | |
| 10225 | if (TYPE_CODE (raw_type) == TYPE_CODE_RANGE) |
| 10226 | base_type = TYPE_TARGET_TYPE (raw_type); |
| 10227 | else |
| 10228 | base_type = raw_type; |
| 10229 | |
| 10230 | name = TYPE_NAME (raw_type); |
| 10231 | subtype_info = strstr (name, "___XD"); |
| 10232 | if (subtype_info == NULL) |
| 10233 | { |
| 10234 | LONGEST L = ada_discrete_type_low_bound (raw_type); |
| 10235 | LONGEST U = ada_discrete_type_high_bound (raw_type); |
| 10236 | |
| 10237 | if (L < INT_MIN || U > INT_MAX) |
| 10238 | return raw_type; |
| 10239 | else |
| 10240 | return create_range_type (alloc_type_copy (raw_type), raw_type, |
| 10241 | ada_discrete_type_low_bound (raw_type), |
| 10242 | ada_discrete_type_high_bound (raw_type)); |
| 10243 | } |
| 10244 | else |
| 10245 | { |
| 10246 | static char *name_buf = NULL; |
| 10247 | static size_t name_len = 0; |
| 10248 | int prefix_len = subtype_info - name; |
| 10249 | LONGEST L, U; |
| 10250 | struct type *type; |
| 10251 | char *bounds_str; |
| 10252 | int n; |
| 10253 | |
| 10254 | GROW_VECT (name_buf, name_len, prefix_len + 5); |
| 10255 | strncpy (name_buf, name, prefix_len); |
| 10256 | name_buf[prefix_len] = '\0'; |
| 10257 | |
| 10258 | subtype_info += 5; |
| 10259 | bounds_str = strchr (subtype_info, '_'); |
| 10260 | n = 1; |
| 10261 | |
| 10262 | if (*subtype_info == 'L') |
| 10263 | { |
| 10264 | if (!ada_scan_number (bounds_str, n, &L, &n) |
| 10265 | && !scan_discrim_bound (bounds_str, n, dval, &L, &n)) |
| 10266 | return raw_type; |
| 10267 | if (bounds_str[n] == '_') |
| 10268 | n += 2; |
| 10269 | else if (bounds_str[n] == '.') /* FIXME? SGI Workshop kludge. */ |
| 10270 | n += 1; |
| 10271 | subtype_info += 1; |
| 10272 | } |
| 10273 | else |
| 10274 | { |
| 10275 | int ok; |
| 10276 | |
| 10277 | strcpy (name_buf + prefix_len, "___L"); |
| 10278 | L = get_int_var_value (name_buf, &ok); |
| 10279 | if (!ok) |
| 10280 | { |
| 10281 | lim_warning (_("Unknown lower bound, using 1.")); |
| 10282 | L = 1; |
| 10283 | } |
| 10284 | } |
| 10285 | |
| 10286 | if (*subtype_info == 'U') |
| 10287 | { |
| 10288 | if (!ada_scan_number (bounds_str, n, &U, &n) |
| 10289 | && !scan_discrim_bound (bounds_str, n, dval, &U, &n)) |
| 10290 | return raw_type; |
| 10291 | } |
| 10292 | else |
| 10293 | { |
| 10294 | int ok; |
| 10295 | |
| 10296 | strcpy (name_buf + prefix_len, "___U"); |
| 10297 | U = get_int_var_value (name_buf, &ok); |
| 10298 | if (!ok) |
| 10299 | { |
| 10300 | lim_warning (_("Unknown upper bound, using %ld."), (long) L); |
| 10301 | U = L; |
| 10302 | } |
| 10303 | } |
| 10304 | |
| 10305 | type = create_range_type (alloc_type_copy (raw_type), base_type, L, U); |
| 10306 | TYPE_NAME (type) = name; |
| 10307 | return type; |
| 10308 | } |
| 10309 | } |
| 10310 | |
| 10311 | /* True iff NAME is the name of a range type. */ |
| 10312 | |
| 10313 | int |
| 10314 | ada_is_range_type_name (const char *name) |
| 10315 | { |
| 10316 | return (name != NULL && strstr (name, "___XD")); |
| 10317 | } |
| 10318 | \f |
| 10319 | |
| 10320 | /* Modular types */ |
| 10321 | |
| 10322 | /* True iff TYPE is an Ada modular type. */ |
| 10323 | |
| 10324 | int |
| 10325 | ada_is_modular_type (struct type *type) |
| 10326 | { |
| 10327 | struct type *subranged_type = base_type (type); |
| 10328 | |
| 10329 | return (subranged_type != NULL && TYPE_CODE (type) == TYPE_CODE_RANGE |
| 10330 | && TYPE_CODE (subranged_type) == TYPE_CODE_INT |
| 10331 | && TYPE_UNSIGNED (subranged_type)); |
| 10332 | } |
| 10333 | |
| 10334 | /* Try to determine the lower and upper bounds of the given modular type |
| 10335 | using the type name only. Return non-zero and set L and U as the lower |
| 10336 | and upper bounds (respectively) if successful. */ |
| 10337 | |
| 10338 | int |
| 10339 | ada_modulus_from_name (struct type *type, ULONGEST *modulus) |
| 10340 | { |
| 10341 | char *name = ada_type_name (type); |
| 10342 | char *suffix; |
| 10343 | int k; |
| 10344 | LONGEST U; |
| 10345 | |
| 10346 | if (name == NULL) |
| 10347 | return 0; |
| 10348 | |
| 10349 | /* Discrete type bounds are encoded using an __XD suffix. In our case, |
| 10350 | we are looking for static bounds, which means an __XDLU suffix. |
| 10351 | Moreover, we know that the lower bound of modular types is always |
| 10352 | zero, so the actual suffix should start with "__XDLU_0__", and |
| 10353 | then be followed by the upper bound value. */ |
| 10354 | suffix = strstr (name, "__XDLU_0__"); |
| 10355 | if (suffix == NULL) |
| 10356 | return 0; |
| 10357 | k = 10; |
| 10358 | if (!ada_scan_number (suffix, k, &U, NULL)) |
| 10359 | return 0; |
| 10360 | |
| 10361 | *modulus = (ULONGEST) U + 1; |
| 10362 | return 1; |
| 10363 | } |
| 10364 | |
| 10365 | /* Assuming ada_is_modular_type (TYPE), the modulus of TYPE. */ |
| 10366 | |
| 10367 | ULONGEST |
| 10368 | ada_modulus (struct type *type) |
| 10369 | { |
| 10370 | return (ULONGEST) TYPE_HIGH_BOUND (type) + 1; |
| 10371 | } |
| 10372 | \f |
| 10373 | |
| 10374 | /* Ada exception catchpoint support: |
| 10375 | --------------------------------- |
| 10376 | |
| 10377 | We support 3 kinds of exception catchpoints: |
| 10378 | . catchpoints on Ada exceptions |
| 10379 | . catchpoints on unhandled Ada exceptions |
| 10380 | . catchpoints on failed assertions |
| 10381 | |
| 10382 | Exceptions raised during failed assertions, or unhandled exceptions |
| 10383 | could perfectly be caught with the general catchpoint on Ada exceptions. |
| 10384 | However, we can easily differentiate these two special cases, and having |
| 10385 | the option to distinguish these two cases from the rest can be useful |
| 10386 | to zero-in on certain situations. |
| 10387 | |
| 10388 | Exception catchpoints are a specialized form of breakpoint, |
| 10389 | since they rely on inserting breakpoints inside known routines |
| 10390 | of the GNAT runtime. The implementation therefore uses a standard |
| 10391 | breakpoint structure of the BP_BREAKPOINT type, but with its own set |
| 10392 | of breakpoint_ops. |
| 10393 | |
| 10394 | Support in the runtime for exception catchpoints have been changed |
| 10395 | a few times already, and these changes affect the implementation |
| 10396 | of these catchpoints. In order to be able to support several |
| 10397 | variants of the runtime, we use a sniffer that will determine |
| 10398 | the runtime variant used by the program being debugged. |
| 10399 | |
| 10400 | At this time, we do not support the use of conditions on Ada exception |
| 10401 | catchpoints. The COND and COND_STRING fields are therefore set |
| 10402 | to NULL (most of the time, see below). |
| 10403 | |
| 10404 | Conditions where EXP_STRING, COND, and COND_STRING are used: |
| 10405 | |
| 10406 | When a user specifies the name of a specific exception in the case |
| 10407 | of catchpoints on Ada exceptions, we store the name of that exception |
| 10408 | in the EXP_STRING. We then translate this request into an actual |
| 10409 | condition stored in COND_STRING, and then parse it into an expression |
| 10410 | stored in COND. */ |
| 10411 | |
| 10412 | /* The different types of catchpoints that we introduced for catching |
| 10413 | Ada exceptions. */ |
| 10414 | |
| 10415 | enum exception_catchpoint_kind |
| 10416 | { |
| 10417 | ex_catch_exception, |
| 10418 | ex_catch_exception_unhandled, |
| 10419 | ex_catch_assert |
| 10420 | }; |
| 10421 | |
| 10422 | /* Ada's standard exceptions. */ |
| 10423 | |
| 10424 | static char *standard_exc[] = { |
| 10425 | "constraint_error", |
| 10426 | "program_error", |
| 10427 | "storage_error", |
| 10428 | "tasking_error" |
| 10429 | }; |
| 10430 | |
| 10431 | typedef CORE_ADDR (ada_unhandled_exception_name_addr_ftype) (void); |
| 10432 | |
| 10433 | /* A structure that describes how to support exception catchpoints |
| 10434 | for a given executable. */ |
| 10435 | |
| 10436 | struct exception_support_info |
| 10437 | { |
| 10438 | /* The name of the symbol to break on in order to insert |
| 10439 | a catchpoint on exceptions. */ |
| 10440 | const char *catch_exception_sym; |
| 10441 | |
| 10442 | /* The name of the symbol to break on in order to insert |
| 10443 | a catchpoint on unhandled exceptions. */ |
| 10444 | const char *catch_exception_unhandled_sym; |
| 10445 | |
| 10446 | /* The name of the symbol to break on in order to insert |
| 10447 | a catchpoint on failed assertions. */ |
| 10448 | const char *catch_assert_sym; |
| 10449 | |
| 10450 | /* Assuming that the inferior just triggered an unhandled exception |
| 10451 | catchpoint, this function is responsible for returning the address |
| 10452 | in inferior memory where the name of that exception is stored. |
| 10453 | Return zero if the address could not be computed. */ |
| 10454 | ada_unhandled_exception_name_addr_ftype *unhandled_exception_name_addr; |
| 10455 | }; |
| 10456 | |
| 10457 | static CORE_ADDR ada_unhandled_exception_name_addr (void); |
| 10458 | static CORE_ADDR ada_unhandled_exception_name_addr_from_raise (void); |
| 10459 | |
| 10460 | /* The following exception support info structure describes how to |
| 10461 | implement exception catchpoints with the latest version of the |
| 10462 | Ada runtime (as of 2007-03-06). */ |
| 10463 | |
| 10464 | static const struct exception_support_info default_exception_support_info = |
| 10465 | { |
| 10466 | "__gnat_debug_raise_exception", /* catch_exception_sym */ |
| 10467 | "__gnat_unhandled_exception", /* catch_exception_unhandled_sym */ |
| 10468 | "__gnat_debug_raise_assert_failure", /* catch_assert_sym */ |
| 10469 | ada_unhandled_exception_name_addr |
| 10470 | }; |
| 10471 | |
| 10472 | /* The following exception support info structure describes how to |
| 10473 | implement exception catchpoints with a slightly older version |
| 10474 | of the Ada runtime. */ |
| 10475 | |
| 10476 | static const struct exception_support_info exception_support_info_fallback = |
| 10477 | { |
| 10478 | "__gnat_raise_nodefer_with_msg", /* catch_exception_sym */ |
| 10479 | "__gnat_unhandled_exception", /* catch_exception_unhandled_sym */ |
| 10480 | "system__assertions__raise_assert_failure", /* catch_assert_sym */ |
| 10481 | ada_unhandled_exception_name_addr_from_raise |
| 10482 | }; |
| 10483 | |
| 10484 | /* For each executable, we sniff which exception info structure to use |
| 10485 | and cache it in the following global variable. */ |
| 10486 | |
| 10487 | static const struct exception_support_info *exception_info = NULL; |
| 10488 | |
| 10489 | /* Inspect the Ada runtime and determine which exception info structure |
| 10490 | should be used to provide support for exception catchpoints. |
| 10491 | |
| 10492 | This function will always set exception_info, or raise an error. */ |
| 10493 | |
| 10494 | static void |
| 10495 | ada_exception_support_info_sniffer (void) |
| 10496 | { |
| 10497 | struct symbol *sym; |
| 10498 | |
| 10499 | /* If the exception info is already known, then no need to recompute it. */ |
| 10500 | if (exception_info != NULL) |
| 10501 | return; |
| 10502 | |
| 10503 | /* Check the latest (default) exception support info. */ |
| 10504 | sym = standard_lookup (default_exception_support_info.catch_exception_sym, |
| 10505 | NULL, VAR_DOMAIN); |
| 10506 | if (sym != NULL) |
| 10507 | { |
| 10508 | exception_info = &default_exception_support_info; |
| 10509 | return; |
| 10510 | } |
| 10511 | |
| 10512 | /* Try our fallback exception suport info. */ |
| 10513 | sym = standard_lookup (exception_support_info_fallback.catch_exception_sym, |
| 10514 | NULL, VAR_DOMAIN); |
| 10515 | if (sym != NULL) |
| 10516 | { |
| 10517 | exception_info = &exception_support_info_fallback; |
| 10518 | return; |
| 10519 | } |
| 10520 | |
| 10521 | /* Sometimes, it is normal for us to not be able to find the routine |
| 10522 | we are looking for. This happens when the program is linked with |
| 10523 | the shared version of the GNAT runtime, and the program has not been |
| 10524 | started yet. Inform the user of these two possible causes if |
| 10525 | applicable. */ |
| 10526 | |
| 10527 | if (ada_update_initial_language (language_unknown) != language_ada) |
| 10528 | error (_("Unable to insert catchpoint. Is this an Ada main program?")); |
| 10529 | |
| 10530 | /* If the symbol does not exist, then check that the program is |
| 10531 | already started, to make sure that shared libraries have been |
| 10532 | loaded. If it is not started, this may mean that the symbol is |
| 10533 | in a shared library. */ |
| 10534 | |
| 10535 | if (ptid_get_pid (inferior_ptid) == 0) |
| 10536 | error (_("Unable to insert catchpoint. Try to start the program first.")); |
| 10537 | |
| 10538 | /* At this point, we know that we are debugging an Ada program and |
| 10539 | that the inferior has been started, but we still are not able to |
| 10540 | find the run-time symbols. That can mean that we are in |
| 10541 | configurable run time mode, or that a-except as been optimized |
| 10542 | out by the linker... In any case, at this point it is not worth |
| 10543 | supporting this feature. */ |
| 10544 | |
| 10545 | error (_("Cannot insert catchpoints in this configuration.")); |
| 10546 | } |
| 10547 | |
| 10548 | /* An observer of "executable_changed" events. |
| 10549 | Its role is to clear certain cached values that need to be recomputed |
| 10550 | each time a new executable is loaded by GDB. */ |
| 10551 | |
| 10552 | static void |
| 10553 | ada_executable_changed_observer (void) |
| 10554 | { |
| 10555 | /* If the executable changed, then it is possible that the Ada runtime |
| 10556 | is different. So we need to invalidate the exception support info |
| 10557 | cache. */ |
| 10558 | exception_info = NULL; |
| 10559 | } |
| 10560 | |
| 10561 | /* True iff FRAME is very likely to be that of a function that is |
| 10562 | part of the runtime system. This is all very heuristic, but is |
| 10563 | intended to be used as advice as to what frames are uninteresting |
| 10564 | to most users. */ |
| 10565 | |
| 10566 | static int |
| 10567 | is_known_support_routine (struct frame_info *frame) |
| 10568 | { |
| 10569 | struct symtab_and_line sal; |
| 10570 | char *func_name; |
| 10571 | enum language func_lang; |
| 10572 | int i; |
| 10573 | |
| 10574 | /* If this code does not have any debugging information (no symtab), |
| 10575 | This cannot be any user code. */ |
| 10576 | |
| 10577 | find_frame_sal (frame, &sal); |
| 10578 | if (sal.symtab == NULL) |
| 10579 | return 1; |
| 10580 | |
| 10581 | /* If there is a symtab, but the associated source file cannot be |
| 10582 | located, then assume this is not user code: Selecting a frame |
| 10583 | for which we cannot display the code would not be very helpful |
| 10584 | for the user. This should also take care of case such as VxWorks |
| 10585 | where the kernel has some debugging info provided for a few units. */ |
| 10586 | |
| 10587 | if (symtab_to_fullname (sal.symtab) == NULL) |
| 10588 | return 1; |
| 10589 | |
| 10590 | /* Check the unit filename againt the Ada runtime file naming. |
| 10591 | We also check the name of the objfile against the name of some |
| 10592 | known system libraries that sometimes come with debugging info |
| 10593 | too. */ |
| 10594 | |
| 10595 | for (i = 0; known_runtime_file_name_patterns[i] != NULL; i += 1) |
| 10596 | { |
| 10597 | re_comp (known_runtime_file_name_patterns[i]); |
| 10598 | if (re_exec (sal.symtab->filename)) |
| 10599 | return 1; |
| 10600 | if (sal.symtab->objfile != NULL |
| 10601 | && re_exec (sal.symtab->objfile->name)) |
| 10602 | return 1; |
| 10603 | } |
| 10604 | |
| 10605 | /* Check whether the function is a GNAT-generated entity. */ |
| 10606 | |
| 10607 | find_frame_funname (frame, &func_name, &func_lang, NULL); |
| 10608 | if (func_name == NULL) |
| 10609 | return 1; |
| 10610 | |
| 10611 | for (i = 0; known_auxiliary_function_name_patterns[i] != NULL; i += 1) |
| 10612 | { |
| 10613 | re_comp (known_auxiliary_function_name_patterns[i]); |
| 10614 | if (re_exec (func_name)) |
| 10615 | return 1; |
| 10616 | } |
| 10617 | |
| 10618 | return 0; |
| 10619 | } |
| 10620 | |
| 10621 | /* Find the first frame that contains debugging information and that is not |
| 10622 | part of the Ada run-time, starting from FI and moving upward. */ |
| 10623 | |
| 10624 | void |
| 10625 | ada_find_printable_frame (struct frame_info *fi) |
| 10626 | { |
| 10627 | for (; fi != NULL; fi = get_prev_frame (fi)) |
| 10628 | { |
| 10629 | if (!is_known_support_routine (fi)) |
| 10630 | { |
| 10631 | select_frame (fi); |
| 10632 | break; |
| 10633 | } |
| 10634 | } |
| 10635 | |
| 10636 | } |
| 10637 | |
| 10638 | /* Assuming that the inferior just triggered an unhandled exception |
| 10639 | catchpoint, return the address in inferior memory where the name |
| 10640 | of the exception is stored. |
| 10641 | |
| 10642 | Return zero if the address could not be computed. */ |
| 10643 | |
| 10644 | static CORE_ADDR |
| 10645 | ada_unhandled_exception_name_addr (void) |
| 10646 | { |
| 10647 | return parse_and_eval_address ("e.full_name"); |
| 10648 | } |
| 10649 | |
| 10650 | /* Same as ada_unhandled_exception_name_addr, except that this function |
| 10651 | should be used when the inferior uses an older version of the runtime, |
| 10652 | where the exception name needs to be extracted from a specific frame |
| 10653 | several frames up in the callstack. */ |
| 10654 | |
| 10655 | static CORE_ADDR |
| 10656 | ada_unhandled_exception_name_addr_from_raise (void) |
| 10657 | { |
| 10658 | int frame_level; |
| 10659 | struct frame_info *fi; |
| 10660 | |
| 10661 | /* To determine the name of this exception, we need to select |
| 10662 | the frame corresponding to RAISE_SYM_NAME. This frame is |
| 10663 | at least 3 levels up, so we simply skip the first 3 frames |
| 10664 | without checking the name of their associated function. */ |
| 10665 | fi = get_current_frame (); |
| 10666 | for (frame_level = 0; frame_level < 3; frame_level += 1) |
| 10667 | if (fi != NULL) |
| 10668 | fi = get_prev_frame (fi); |
| 10669 | |
| 10670 | while (fi != NULL) |
| 10671 | { |
| 10672 | char *func_name; |
| 10673 | enum language func_lang; |
| 10674 | |
| 10675 | find_frame_funname (fi, &func_name, &func_lang, NULL); |
| 10676 | if (func_name != NULL |
| 10677 | && strcmp (func_name, exception_info->catch_exception_sym) == 0) |
| 10678 | break; /* We found the frame we were looking for... */ |
| 10679 | fi = get_prev_frame (fi); |
| 10680 | } |
| 10681 | |
| 10682 | if (fi == NULL) |
| 10683 | return 0; |
| 10684 | |
| 10685 | select_frame (fi); |
| 10686 | return parse_and_eval_address ("id.full_name"); |
| 10687 | } |
| 10688 | |
| 10689 | /* Assuming the inferior just triggered an Ada exception catchpoint |
| 10690 | (of any type), return the address in inferior memory where the name |
| 10691 | of the exception is stored, if applicable. |
| 10692 | |
| 10693 | Return zero if the address could not be computed, or if not relevant. */ |
| 10694 | |
| 10695 | static CORE_ADDR |
| 10696 | ada_exception_name_addr_1 (enum exception_catchpoint_kind ex, |
| 10697 | struct breakpoint *b) |
| 10698 | { |
| 10699 | switch (ex) |
| 10700 | { |
| 10701 | case ex_catch_exception: |
| 10702 | return (parse_and_eval_address ("e.full_name")); |
| 10703 | break; |
| 10704 | |
| 10705 | case ex_catch_exception_unhandled: |
| 10706 | return exception_info->unhandled_exception_name_addr (); |
| 10707 | break; |
| 10708 | |
| 10709 | case ex_catch_assert: |
| 10710 | return 0; /* Exception name is not relevant in this case. */ |
| 10711 | break; |
| 10712 | |
| 10713 | default: |
| 10714 | internal_error (__FILE__, __LINE__, _("unexpected catchpoint type")); |
| 10715 | break; |
| 10716 | } |
| 10717 | |
| 10718 | return 0; /* Should never be reached. */ |
| 10719 | } |
| 10720 | |
| 10721 | /* Same as ada_exception_name_addr_1, except that it intercepts and contains |
| 10722 | any error that ada_exception_name_addr_1 might cause to be thrown. |
| 10723 | When an error is intercepted, a warning with the error message is printed, |
| 10724 | and zero is returned. */ |
| 10725 | |
| 10726 | static CORE_ADDR |
| 10727 | ada_exception_name_addr (enum exception_catchpoint_kind ex, |
| 10728 | struct breakpoint *b) |
| 10729 | { |
| 10730 | struct gdb_exception e; |
| 10731 | CORE_ADDR result = 0; |
| 10732 | |
| 10733 | TRY_CATCH (e, RETURN_MASK_ERROR) |
| 10734 | { |
| 10735 | result = ada_exception_name_addr_1 (ex, b); |
| 10736 | } |
| 10737 | |
| 10738 | if (e.reason < 0) |
| 10739 | { |
| 10740 | warning (_("failed to get exception name: %s"), e.message); |
| 10741 | return 0; |
| 10742 | } |
| 10743 | |
| 10744 | return result; |
| 10745 | } |
| 10746 | |
| 10747 | /* Implement the PRINT_IT method in the breakpoint_ops structure |
| 10748 | for all exception catchpoint kinds. */ |
| 10749 | |
| 10750 | static enum print_stop_action |
| 10751 | print_it_exception (enum exception_catchpoint_kind ex, struct breakpoint *b) |
| 10752 | { |
| 10753 | annotate_catchpoint (b->number); |
| 10754 | |
| 10755 | if (ui_out_is_mi_like_p (uiout)) |
| 10756 | { |
| 10757 | ui_out_field_string (uiout, "reason", |
| 10758 | async_reason_lookup (EXEC_ASYNC_BREAKPOINT_HIT)); |
| 10759 | ui_out_field_string (uiout, "disp", bpdisp_text (b->disposition)); |
| 10760 | } |
| 10761 | |
| 10762 | ui_out_text (uiout, "\nCatchpoint "); |
| 10763 | ui_out_field_int (uiout, "bkptno", b->number); |
| 10764 | ui_out_text (uiout, ", "); |
| 10765 | |
| 10766 | switch (ex) |
| 10767 | { |
| 10768 | case ex_catch_exception: |
| 10769 | case ex_catch_exception_unhandled: |
| 10770 | { |
| 10771 | const CORE_ADDR addr = ada_exception_name_addr (ex, b); |
| 10772 | char exception_name[256]; |
| 10773 | |
| 10774 | if (addr != 0) |
| 10775 | { |
| 10776 | read_memory (addr, exception_name, sizeof (exception_name) - 1); |
| 10777 | exception_name [sizeof (exception_name) - 1] = '\0'; |
| 10778 | } |
| 10779 | else |
| 10780 | { |
| 10781 | /* For some reason, we were unable to read the exception |
| 10782 | name. This could happen if the Runtime was compiled |
| 10783 | without debugging info, for instance. In that case, |
| 10784 | just replace the exception name by the generic string |
| 10785 | "exception" - it will read as "an exception" in the |
| 10786 | notification we are about to print. */ |
| 10787 | sprintf (exception_name, "exception"); |
| 10788 | } |
| 10789 | /* In the case of unhandled exception breakpoints, we print |
| 10790 | the exception name as "unhandled EXCEPTION_NAME", to make |
| 10791 | it clearer to the user which kind of catchpoint just got |
| 10792 | hit. We used ui_out_text to make sure that this extra |
| 10793 | info does not pollute the exception name in the MI case. */ |
| 10794 | if (ex == ex_catch_exception_unhandled) |
| 10795 | ui_out_text (uiout, "unhandled "); |
| 10796 | ui_out_field_string (uiout, "exception-name", exception_name); |
| 10797 | } |
| 10798 | break; |
| 10799 | case ex_catch_assert: |
| 10800 | /* In this case, the name of the exception is not really |
| 10801 | important. Just print "failed assertion" to make it clearer |
| 10802 | that his program just hit an assertion-failure catchpoint. |
| 10803 | We used ui_out_text because this info does not belong in |
| 10804 | the MI output. */ |
| 10805 | ui_out_text (uiout, "failed assertion"); |
| 10806 | break; |
| 10807 | } |
| 10808 | ui_out_text (uiout, " at "); |
| 10809 | ada_find_printable_frame (get_current_frame ()); |
| 10810 | |
| 10811 | return PRINT_SRC_AND_LOC; |
| 10812 | } |
| 10813 | |
| 10814 | /* Implement the PRINT_ONE method in the breakpoint_ops structure |
| 10815 | for all exception catchpoint kinds. */ |
| 10816 | |
| 10817 | static void |
| 10818 | print_one_exception (enum exception_catchpoint_kind ex, |
| 10819 | struct breakpoint *b, struct bp_location **last_loc) |
| 10820 | { |
| 10821 | struct value_print_options opts; |
| 10822 | |
| 10823 | get_user_print_options (&opts); |
| 10824 | if (opts.addressprint) |
| 10825 | { |
| 10826 | annotate_field (4); |
| 10827 | ui_out_field_core_addr (uiout, "addr", b->loc->gdbarch, b->loc->address); |
| 10828 | } |
| 10829 | |
| 10830 | annotate_field (5); |
| 10831 | *last_loc = b->loc; |
| 10832 | switch (ex) |
| 10833 | { |
| 10834 | case ex_catch_exception: |
| 10835 | if (b->exp_string != NULL) |
| 10836 | { |
| 10837 | char *msg = xstrprintf (_("`%s' Ada exception"), b->exp_string); |
| 10838 | |
| 10839 | ui_out_field_string (uiout, "what", msg); |
| 10840 | xfree (msg); |
| 10841 | } |
| 10842 | else |
| 10843 | ui_out_field_string (uiout, "what", "all Ada exceptions"); |
| 10844 | |
| 10845 | break; |
| 10846 | |
| 10847 | case ex_catch_exception_unhandled: |
| 10848 | ui_out_field_string (uiout, "what", "unhandled Ada exceptions"); |
| 10849 | break; |
| 10850 | |
| 10851 | case ex_catch_assert: |
| 10852 | ui_out_field_string (uiout, "what", "failed Ada assertions"); |
| 10853 | break; |
| 10854 | |
| 10855 | default: |
| 10856 | internal_error (__FILE__, __LINE__, _("unexpected catchpoint type")); |
| 10857 | break; |
| 10858 | } |
| 10859 | } |
| 10860 | |
| 10861 | /* Implement the PRINT_MENTION method in the breakpoint_ops structure |
| 10862 | for all exception catchpoint kinds. */ |
| 10863 | |
| 10864 | static void |
| 10865 | print_mention_exception (enum exception_catchpoint_kind ex, |
| 10866 | struct breakpoint *b) |
| 10867 | { |
| 10868 | switch (ex) |
| 10869 | { |
| 10870 | case ex_catch_exception: |
| 10871 | if (b->exp_string != NULL) |
| 10872 | printf_filtered (_("Catchpoint %d: `%s' Ada exception"), |
| 10873 | b->number, b->exp_string); |
| 10874 | else |
| 10875 | printf_filtered (_("Catchpoint %d: all Ada exceptions"), b->number); |
| 10876 | |
| 10877 | break; |
| 10878 | |
| 10879 | case ex_catch_exception_unhandled: |
| 10880 | printf_filtered (_("Catchpoint %d: unhandled Ada exceptions"), |
| 10881 | b->number); |
| 10882 | break; |
| 10883 | |
| 10884 | case ex_catch_assert: |
| 10885 | printf_filtered (_("Catchpoint %d: failed Ada assertions"), b->number); |
| 10886 | break; |
| 10887 | |
| 10888 | default: |
| 10889 | internal_error (__FILE__, __LINE__, _("unexpected catchpoint type")); |
| 10890 | break; |
| 10891 | } |
| 10892 | } |
| 10893 | |
| 10894 | /* Implement the PRINT_RECREATE method in the breakpoint_ops structure |
| 10895 | for all exception catchpoint kinds. */ |
| 10896 | |
| 10897 | static void |
| 10898 | print_recreate_exception (enum exception_catchpoint_kind ex, |
| 10899 | struct breakpoint *b, struct ui_file *fp) |
| 10900 | { |
| 10901 | switch (ex) |
| 10902 | { |
| 10903 | case ex_catch_exception: |
| 10904 | fprintf_filtered (fp, "catch exception"); |
| 10905 | if (b->exp_string != NULL) |
| 10906 | fprintf_filtered (fp, " %s", b->exp_string); |
| 10907 | break; |
| 10908 | |
| 10909 | case ex_catch_exception_unhandled: |
| 10910 | fprintf_filtered (fp, "catch exception unhandled"); |
| 10911 | break; |
| 10912 | |
| 10913 | case ex_catch_assert: |
| 10914 | fprintf_filtered (fp, "catch assert"); |
| 10915 | break; |
| 10916 | |
| 10917 | default: |
| 10918 | internal_error (__FILE__, __LINE__, _("unexpected catchpoint type")); |
| 10919 | } |
| 10920 | } |
| 10921 | |
| 10922 | /* Virtual table for "catch exception" breakpoints. */ |
| 10923 | |
| 10924 | static enum print_stop_action |
| 10925 | print_it_catch_exception (struct breakpoint *b) |
| 10926 | { |
| 10927 | return print_it_exception (ex_catch_exception, b); |
| 10928 | } |
| 10929 | |
| 10930 | static void |
| 10931 | print_one_catch_exception (struct breakpoint *b, struct bp_location **last_loc) |
| 10932 | { |
| 10933 | print_one_exception (ex_catch_exception, b, last_loc); |
| 10934 | } |
| 10935 | |
| 10936 | static void |
| 10937 | print_mention_catch_exception (struct breakpoint *b) |
| 10938 | { |
| 10939 | print_mention_exception (ex_catch_exception, b); |
| 10940 | } |
| 10941 | |
| 10942 | static void |
| 10943 | print_recreate_catch_exception (struct breakpoint *b, struct ui_file *fp) |
| 10944 | { |
| 10945 | print_recreate_exception (ex_catch_exception, b, fp); |
| 10946 | } |
| 10947 | |
| 10948 | static struct breakpoint_ops catch_exception_breakpoint_ops = |
| 10949 | { |
| 10950 | NULL, /* insert */ |
| 10951 | NULL, /* remove */ |
| 10952 | NULL, /* breakpoint_hit */ |
| 10953 | NULL, /* resources_needed */ |
| 10954 | print_it_catch_exception, |
| 10955 | print_one_catch_exception, |
| 10956 | NULL, /* print_one_detail */ |
| 10957 | print_mention_catch_exception, |
| 10958 | print_recreate_catch_exception |
| 10959 | }; |
| 10960 | |
| 10961 | /* Virtual table for "catch exception unhandled" breakpoints. */ |
| 10962 | |
| 10963 | static enum print_stop_action |
| 10964 | print_it_catch_exception_unhandled (struct breakpoint *b) |
| 10965 | { |
| 10966 | return print_it_exception (ex_catch_exception_unhandled, b); |
| 10967 | } |
| 10968 | |
| 10969 | static void |
| 10970 | print_one_catch_exception_unhandled (struct breakpoint *b, |
| 10971 | struct bp_location **last_loc) |
| 10972 | { |
| 10973 | print_one_exception (ex_catch_exception_unhandled, b, last_loc); |
| 10974 | } |
| 10975 | |
| 10976 | static void |
| 10977 | print_mention_catch_exception_unhandled (struct breakpoint *b) |
| 10978 | { |
| 10979 | print_mention_exception (ex_catch_exception_unhandled, b); |
| 10980 | } |
| 10981 | |
| 10982 | static void |
| 10983 | print_recreate_catch_exception_unhandled (struct breakpoint *b, |
| 10984 | struct ui_file *fp) |
| 10985 | { |
| 10986 | print_recreate_exception (ex_catch_exception_unhandled, b, fp); |
| 10987 | } |
| 10988 | |
| 10989 | static struct breakpoint_ops catch_exception_unhandled_breakpoint_ops = { |
| 10990 | NULL, /* insert */ |
| 10991 | NULL, /* remove */ |
| 10992 | NULL, /* breakpoint_hit */ |
| 10993 | NULL, /* resources_needed */ |
| 10994 | print_it_catch_exception_unhandled, |
| 10995 | print_one_catch_exception_unhandled, |
| 10996 | NULL, /* print_one_detail */ |
| 10997 | print_mention_catch_exception_unhandled, |
| 10998 | print_recreate_catch_exception_unhandled |
| 10999 | }; |
| 11000 | |
| 11001 | /* Virtual table for "catch assert" breakpoints. */ |
| 11002 | |
| 11003 | static enum print_stop_action |
| 11004 | print_it_catch_assert (struct breakpoint *b) |
| 11005 | { |
| 11006 | return print_it_exception (ex_catch_assert, b); |
| 11007 | } |
| 11008 | |
| 11009 | static void |
| 11010 | print_one_catch_assert (struct breakpoint *b, struct bp_location **last_loc) |
| 11011 | { |
| 11012 | print_one_exception (ex_catch_assert, b, last_loc); |
| 11013 | } |
| 11014 | |
| 11015 | static void |
| 11016 | print_mention_catch_assert (struct breakpoint *b) |
| 11017 | { |
| 11018 | print_mention_exception (ex_catch_assert, b); |
| 11019 | } |
| 11020 | |
| 11021 | static void |
| 11022 | print_recreate_catch_assert (struct breakpoint *b, struct ui_file *fp) |
| 11023 | { |
| 11024 | print_recreate_exception (ex_catch_assert, b, fp); |
| 11025 | } |
| 11026 | |
| 11027 | static struct breakpoint_ops catch_assert_breakpoint_ops = { |
| 11028 | NULL, /* insert */ |
| 11029 | NULL, /* remove */ |
| 11030 | NULL, /* breakpoint_hit */ |
| 11031 | NULL, /* resources_needed */ |
| 11032 | print_it_catch_assert, |
| 11033 | print_one_catch_assert, |
| 11034 | NULL, /* print_one_detail */ |
| 11035 | print_mention_catch_assert, |
| 11036 | print_recreate_catch_assert |
| 11037 | }; |
| 11038 | |
| 11039 | /* Return non-zero if B is an Ada exception catchpoint. */ |
| 11040 | |
| 11041 | int |
| 11042 | ada_exception_catchpoint_p (struct breakpoint *b) |
| 11043 | { |
| 11044 | return (b->ops == &catch_exception_breakpoint_ops |
| 11045 | || b->ops == &catch_exception_unhandled_breakpoint_ops |
| 11046 | || b->ops == &catch_assert_breakpoint_ops); |
| 11047 | } |
| 11048 | |
| 11049 | /* Return a newly allocated copy of the first space-separated token |
| 11050 | in ARGSP, and then adjust ARGSP to point immediately after that |
| 11051 | token. |
| 11052 | |
| 11053 | Return NULL if ARGPS does not contain any more tokens. */ |
| 11054 | |
| 11055 | static char * |
| 11056 | ada_get_next_arg (char **argsp) |
| 11057 | { |
| 11058 | char *args = *argsp; |
| 11059 | char *end; |
| 11060 | char *result; |
| 11061 | |
| 11062 | /* Skip any leading white space. */ |
| 11063 | |
| 11064 | while (isspace (*args)) |
| 11065 | args++; |
| 11066 | |
| 11067 | if (args[0] == '\0') |
| 11068 | return NULL; /* No more arguments. */ |
| 11069 | |
| 11070 | /* Find the end of the current argument. */ |
| 11071 | |
| 11072 | end = args; |
| 11073 | while (*end != '\0' && !isspace (*end)) |
| 11074 | end++; |
| 11075 | |
| 11076 | /* Adjust ARGSP to point to the start of the next argument. */ |
| 11077 | |
| 11078 | *argsp = end; |
| 11079 | |
| 11080 | /* Make a copy of the current argument and return it. */ |
| 11081 | |
| 11082 | result = xmalloc (end - args + 1); |
| 11083 | strncpy (result, args, end - args); |
| 11084 | result[end - args] = '\0'; |
| 11085 | |
| 11086 | return result; |
| 11087 | } |
| 11088 | |
| 11089 | /* Split the arguments specified in a "catch exception" command. |
| 11090 | Set EX to the appropriate catchpoint type. |
| 11091 | Set EXP_STRING to the name of the specific exception if |
| 11092 | specified by the user. */ |
| 11093 | |
| 11094 | static void |
| 11095 | catch_ada_exception_command_split (char *args, |
| 11096 | enum exception_catchpoint_kind *ex, |
| 11097 | char **exp_string) |
| 11098 | { |
| 11099 | struct cleanup *old_chain = make_cleanup (null_cleanup, NULL); |
| 11100 | char *exception_name; |
| 11101 | |
| 11102 | exception_name = ada_get_next_arg (&args); |
| 11103 | make_cleanup (xfree, exception_name); |
| 11104 | |
| 11105 | /* Check that we do not have any more arguments. Anything else |
| 11106 | is unexpected. */ |
| 11107 | |
| 11108 | while (isspace (*args)) |
| 11109 | args++; |
| 11110 | |
| 11111 | if (args[0] != '\0') |
| 11112 | error (_("Junk at end of expression")); |
| 11113 | |
| 11114 | discard_cleanups (old_chain); |
| 11115 | |
| 11116 | if (exception_name == NULL) |
| 11117 | { |
| 11118 | /* Catch all exceptions. */ |
| 11119 | *ex = ex_catch_exception; |
| 11120 | *exp_string = NULL; |
| 11121 | } |
| 11122 | else if (strcmp (exception_name, "unhandled") == 0) |
| 11123 | { |
| 11124 | /* Catch unhandled exceptions. */ |
| 11125 | *ex = ex_catch_exception_unhandled; |
| 11126 | *exp_string = NULL; |
| 11127 | } |
| 11128 | else |
| 11129 | { |
| 11130 | /* Catch a specific exception. */ |
| 11131 | *ex = ex_catch_exception; |
| 11132 | *exp_string = exception_name; |
| 11133 | } |
| 11134 | } |
| 11135 | |
| 11136 | /* Return the name of the symbol on which we should break in order to |
| 11137 | implement a catchpoint of the EX kind. */ |
| 11138 | |
| 11139 | static const char * |
| 11140 | ada_exception_sym_name (enum exception_catchpoint_kind ex) |
| 11141 | { |
| 11142 | gdb_assert (exception_info != NULL); |
| 11143 | |
| 11144 | switch (ex) |
| 11145 | { |
| 11146 | case ex_catch_exception: |
| 11147 | return (exception_info->catch_exception_sym); |
| 11148 | break; |
| 11149 | case ex_catch_exception_unhandled: |
| 11150 | return (exception_info->catch_exception_unhandled_sym); |
| 11151 | break; |
| 11152 | case ex_catch_assert: |
| 11153 | return (exception_info->catch_assert_sym); |
| 11154 | break; |
| 11155 | default: |
| 11156 | internal_error (__FILE__, __LINE__, |
| 11157 | _("unexpected catchpoint kind (%d)"), ex); |
| 11158 | } |
| 11159 | } |
| 11160 | |
| 11161 | /* Return the breakpoint ops "virtual table" used for catchpoints |
| 11162 | of the EX kind. */ |
| 11163 | |
| 11164 | static struct breakpoint_ops * |
| 11165 | ada_exception_breakpoint_ops (enum exception_catchpoint_kind ex) |
| 11166 | { |
| 11167 | switch (ex) |
| 11168 | { |
| 11169 | case ex_catch_exception: |
| 11170 | return (&catch_exception_breakpoint_ops); |
| 11171 | break; |
| 11172 | case ex_catch_exception_unhandled: |
| 11173 | return (&catch_exception_unhandled_breakpoint_ops); |
| 11174 | break; |
| 11175 | case ex_catch_assert: |
| 11176 | return (&catch_assert_breakpoint_ops); |
| 11177 | break; |
| 11178 | default: |
| 11179 | internal_error (__FILE__, __LINE__, |
| 11180 | _("unexpected catchpoint kind (%d)"), ex); |
| 11181 | } |
| 11182 | } |
| 11183 | |
| 11184 | /* Return the condition that will be used to match the current exception |
| 11185 | being raised with the exception that the user wants to catch. This |
| 11186 | assumes that this condition is used when the inferior just triggered |
| 11187 | an exception catchpoint. |
| 11188 | |
| 11189 | The string returned is a newly allocated string that needs to be |
| 11190 | deallocated later. */ |
| 11191 | |
| 11192 | static char * |
| 11193 | ada_exception_catchpoint_cond_string (const char *exp_string) |
| 11194 | { |
| 11195 | int i; |
| 11196 | |
| 11197 | /* The standard exceptions are a special case. They are defined in |
| 11198 | runtime units that have been compiled without debugging info; if |
| 11199 | EXP_STRING is the not-fully-qualified name of a standard |
| 11200 | exception (e.g. "constraint_error") then, during the evaluation |
| 11201 | of the condition expression, the symbol lookup on this name would |
| 11202 | *not* return this standard exception. The catchpoint condition |
| 11203 | may then be set only on user-defined exceptions which have the |
| 11204 | same not-fully-qualified name (e.g. my_package.constraint_error). |
| 11205 | |
| 11206 | To avoid this unexcepted behavior, these standard exceptions are |
| 11207 | systematically prefixed by "standard". This means that "catch |
| 11208 | exception constraint_error" is rewritten into "catch exception |
| 11209 | standard.constraint_error". |
| 11210 | |
| 11211 | If an exception named contraint_error is defined in another package of |
| 11212 | the inferior program, then the only way to specify this exception as a |
| 11213 | breakpoint condition is to use its fully-qualified named: |
| 11214 | e.g. my_package.constraint_error. */ |
| 11215 | |
| 11216 | for (i = 0; i < sizeof (standard_exc) / sizeof (char *); i++) |
| 11217 | { |
| 11218 | if (strcmp (standard_exc [i], exp_string) == 0) |
| 11219 | { |
| 11220 | return xstrprintf ("long_integer (e) = long_integer (&standard.%s)", |
| 11221 | exp_string); |
| 11222 | } |
| 11223 | } |
| 11224 | return xstrprintf ("long_integer (e) = long_integer (&%s)", exp_string); |
| 11225 | } |
| 11226 | |
| 11227 | /* Return the expression corresponding to COND_STRING evaluated at SAL. */ |
| 11228 | |
| 11229 | static struct expression * |
| 11230 | ada_parse_catchpoint_condition (char *cond_string, |
| 11231 | struct symtab_and_line sal) |
| 11232 | { |
| 11233 | return (parse_exp_1 (&cond_string, block_for_pc (sal.pc), 0)); |
| 11234 | } |
| 11235 | |
| 11236 | /* Return the symtab_and_line that should be used to insert an exception |
| 11237 | catchpoint of the TYPE kind. |
| 11238 | |
| 11239 | EX_STRING should contain the name of a specific exception |
| 11240 | that the catchpoint should catch, or NULL otherwise. |
| 11241 | |
| 11242 | The idea behind all the remaining parameters is that their names match |
| 11243 | the name of certain fields in the breakpoint structure that are used to |
| 11244 | handle exception catchpoints. This function returns the value to which |
| 11245 | these fields should be set, depending on the type of catchpoint we need |
| 11246 | to create. |
| 11247 | |
| 11248 | If COND and COND_STRING are both non-NULL, any value they might |
| 11249 | hold will be free'ed, and then replaced by newly allocated ones. |
| 11250 | These parameters are left untouched otherwise. */ |
| 11251 | |
| 11252 | static struct symtab_and_line |
| 11253 | ada_exception_sal (enum exception_catchpoint_kind ex, char *exp_string, |
| 11254 | char **addr_string, char **cond_string, |
| 11255 | struct expression **cond, struct breakpoint_ops **ops) |
| 11256 | { |
| 11257 | const char *sym_name; |
| 11258 | struct symbol *sym; |
| 11259 | struct symtab_and_line sal; |
| 11260 | |
| 11261 | /* First, find out which exception support info to use. */ |
| 11262 | ada_exception_support_info_sniffer (); |
| 11263 | |
| 11264 | /* Then lookup the function on which we will break in order to catch |
| 11265 | the Ada exceptions requested by the user. */ |
| 11266 | |
| 11267 | sym_name = ada_exception_sym_name (ex); |
| 11268 | sym = standard_lookup (sym_name, NULL, VAR_DOMAIN); |
| 11269 | |
| 11270 | /* The symbol we're looking up is provided by a unit in the GNAT runtime |
| 11271 | that should be compiled with debugging information. As a result, we |
| 11272 | expect to find that symbol in the symtabs. If we don't find it, then |
| 11273 | the target most likely does not support Ada exceptions, or we cannot |
| 11274 | insert exception breakpoints yet, because the GNAT runtime hasn't been |
| 11275 | loaded yet. */ |
| 11276 | |
| 11277 | /* brobecker/2006-12-26: It is conceivable that the runtime was compiled |
| 11278 | in such a way that no debugging information is produced for the symbol |
| 11279 | we are looking for. In this case, we could search the minimal symbols |
| 11280 | as a fall-back mechanism. This would still be operating in degraded |
| 11281 | mode, however, as we would still be missing the debugging information |
| 11282 | that is needed in order to extract the name of the exception being |
| 11283 | raised (this name is printed in the catchpoint message, and is also |
| 11284 | used when trying to catch a specific exception). We do not handle |
| 11285 | this case for now. */ |
| 11286 | |
| 11287 | if (sym == NULL) |
| 11288 | error (_("Unable to break on '%s' in this configuration."), sym_name); |
| 11289 | |
| 11290 | /* Make sure that the symbol we found corresponds to a function. */ |
| 11291 | if (SYMBOL_CLASS (sym) != LOC_BLOCK) |
| 11292 | error (_("Symbol \"%s\" is not a function (class = %d)"), |
| 11293 | sym_name, SYMBOL_CLASS (sym)); |
| 11294 | |
| 11295 | sal = find_function_start_sal (sym, 1); |
| 11296 | |
| 11297 | /* Set ADDR_STRING. */ |
| 11298 | |
| 11299 | *addr_string = xstrdup (sym_name); |
| 11300 | |
| 11301 | /* Set the COND and COND_STRING (if not NULL). */ |
| 11302 | |
| 11303 | if (cond_string != NULL && cond != NULL) |
| 11304 | { |
| 11305 | if (*cond_string != NULL) |
| 11306 | { |
| 11307 | xfree (*cond_string); |
| 11308 | *cond_string = NULL; |
| 11309 | } |
| 11310 | if (*cond != NULL) |
| 11311 | { |
| 11312 | xfree (*cond); |
| 11313 | *cond = NULL; |
| 11314 | } |
| 11315 | if (exp_string != NULL) |
| 11316 | { |
| 11317 | *cond_string = ada_exception_catchpoint_cond_string (exp_string); |
| 11318 | *cond = ada_parse_catchpoint_condition (*cond_string, sal); |
| 11319 | } |
| 11320 | } |
| 11321 | |
| 11322 | /* Set OPS. */ |
| 11323 | *ops = ada_exception_breakpoint_ops (ex); |
| 11324 | |
| 11325 | return sal; |
| 11326 | } |
| 11327 | |
| 11328 | /* Parse the arguments (ARGS) of the "catch exception" command. |
| 11329 | |
| 11330 | Set TYPE to the appropriate exception catchpoint type. |
| 11331 | If the user asked the catchpoint to catch only a specific |
| 11332 | exception, then save the exception name in ADDR_STRING. |
| 11333 | |
| 11334 | See ada_exception_sal for a description of all the remaining |
| 11335 | function arguments of this function. */ |
| 11336 | |
| 11337 | struct symtab_and_line |
| 11338 | ada_decode_exception_location (char *args, char **addr_string, |
| 11339 | char **exp_string, char **cond_string, |
| 11340 | struct expression **cond, |
| 11341 | struct breakpoint_ops **ops) |
| 11342 | { |
| 11343 | enum exception_catchpoint_kind ex; |
| 11344 | |
| 11345 | catch_ada_exception_command_split (args, &ex, exp_string); |
| 11346 | return ada_exception_sal (ex, *exp_string, addr_string, cond_string, |
| 11347 | cond, ops); |
| 11348 | } |
| 11349 | |
| 11350 | struct symtab_and_line |
| 11351 | ada_decode_assert_location (char *args, char **addr_string, |
| 11352 | struct breakpoint_ops **ops) |
| 11353 | { |
| 11354 | /* Check that no argument where provided at the end of the command. */ |
| 11355 | |
| 11356 | if (args != NULL) |
| 11357 | { |
| 11358 | while (isspace (*args)) |
| 11359 | args++; |
| 11360 | if (*args != '\0') |
| 11361 | error (_("Junk at end of arguments.")); |
| 11362 | } |
| 11363 | |
| 11364 | return ada_exception_sal (ex_catch_assert, NULL, addr_string, NULL, NULL, |
| 11365 | ops); |
| 11366 | } |
| 11367 | |
| 11368 | /* Operators */ |
| 11369 | /* Information about operators given special treatment in functions |
| 11370 | below. */ |
| 11371 | /* Format: OP_DEFN (<operator>, <operator length>, <# args>, <binop>). */ |
| 11372 | |
| 11373 | #define ADA_OPERATORS \ |
| 11374 | OP_DEFN (OP_VAR_VALUE, 4, 0, 0) \ |
| 11375 | OP_DEFN (BINOP_IN_BOUNDS, 3, 2, 0) \ |
| 11376 | OP_DEFN (TERNOP_IN_RANGE, 1, 3, 0) \ |
| 11377 | OP_DEFN (OP_ATR_FIRST, 1, 2, 0) \ |
| 11378 | OP_DEFN (OP_ATR_LAST, 1, 2, 0) \ |
| 11379 | OP_DEFN (OP_ATR_LENGTH, 1, 2, 0) \ |
| 11380 | OP_DEFN (OP_ATR_IMAGE, 1, 2, 0) \ |
| 11381 | OP_DEFN (OP_ATR_MAX, 1, 3, 0) \ |
| 11382 | OP_DEFN (OP_ATR_MIN, 1, 3, 0) \ |
| 11383 | OP_DEFN (OP_ATR_MODULUS, 1, 1, 0) \ |
| 11384 | OP_DEFN (OP_ATR_POS, 1, 2, 0) \ |
| 11385 | OP_DEFN (OP_ATR_SIZE, 1, 1, 0) \ |
| 11386 | OP_DEFN (OP_ATR_TAG, 1, 1, 0) \ |
| 11387 | OP_DEFN (OP_ATR_VAL, 1, 2, 0) \ |
| 11388 | OP_DEFN (UNOP_QUAL, 3, 1, 0) \ |
| 11389 | OP_DEFN (UNOP_IN_RANGE, 3, 1, 0) \ |
| 11390 | OP_DEFN (OP_OTHERS, 1, 1, 0) \ |
| 11391 | OP_DEFN (OP_POSITIONAL, 3, 1, 0) \ |
| 11392 | OP_DEFN (OP_DISCRETE_RANGE, 1, 2, 0) |
| 11393 | |
| 11394 | static void |
| 11395 | ada_operator_length (const struct expression *exp, int pc, int *oplenp, |
| 11396 | int *argsp) |
| 11397 | { |
| 11398 | switch (exp->elts[pc - 1].opcode) |
| 11399 | { |
| 11400 | default: |
| 11401 | operator_length_standard (exp, pc, oplenp, argsp); |
| 11402 | break; |
| 11403 | |
| 11404 | #define OP_DEFN(op, len, args, binop) \ |
| 11405 | case op: *oplenp = len; *argsp = args; break; |
| 11406 | ADA_OPERATORS; |
| 11407 | #undef OP_DEFN |
| 11408 | |
| 11409 | case OP_AGGREGATE: |
| 11410 | *oplenp = 3; |
| 11411 | *argsp = longest_to_int (exp->elts[pc - 2].longconst); |
| 11412 | break; |
| 11413 | |
| 11414 | case OP_CHOICES: |
| 11415 | *oplenp = 3; |
| 11416 | *argsp = longest_to_int (exp->elts[pc - 2].longconst) + 1; |
| 11417 | break; |
| 11418 | } |
| 11419 | } |
| 11420 | |
| 11421 | /* Implementation of the exp_descriptor method operator_check. */ |
| 11422 | |
| 11423 | static int |
| 11424 | ada_operator_check (struct expression *exp, int pos, |
| 11425 | int (*objfile_func) (struct objfile *objfile, void *data), |
| 11426 | void *data) |
| 11427 | { |
| 11428 | const union exp_element *const elts = exp->elts; |
| 11429 | struct type *type = NULL; |
| 11430 | |
| 11431 | switch (elts[pos].opcode) |
| 11432 | { |
| 11433 | case UNOP_IN_RANGE: |
| 11434 | case UNOP_QUAL: |
| 11435 | type = elts[pos + 1].type; |
| 11436 | break; |
| 11437 | |
| 11438 | default: |
| 11439 | return operator_check_standard (exp, pos, objfile_func, data); |
| 11440 | } |
| 11441 | |
| 11442 | /* Invoke callbacks for TYPE and OBJFILE if they were set as non-NULL. */ |
| 11443 | |
| 11444 | if (type && TYPE_OBJFILE (type) |
| 11445 | && (*objfile_func) (TYPE_OBJFILE (type), data)) |
| 11446 | return 1; |
| 11447 | |
| 11448 | return 0; |
| 11449 | } |
| 11450 | |
| 11451 | static char * |
| 11452 | ada_op_name (enum exp_opcode opcode) |
| 11453 | { |
| 11454 | switch (opcode) |
| 11455 | { |
| 11456 | default: |
| 11457 | return op_name_standard (opcode); |
| 11458 | |
| 11459 | #define OP_DEFN(op, len, args, binop) case op: return #op; |
| 11460 | ADA_OPERATORS; |
| 11461 | #undef OP_DEFN |
| 11462 | |
| 11463 | case OP_AGGREGATE: |
| 11464 | return "OP_AGGREGATE"; |
| 11465 | case OP_CHOICES: |
| 11466 | return "OP_CHOICES"; |
| 11467 | case OP_NAME: |
| 11468 | return "OP_NAME"; |
| 11469 | } |
| 11470 | } |
| 11471 | |
| 11472 | /* As for operator_length, but assumes PC is pointing at the first |
| 11473 | element of the operator, and gives meaningful results only for the |
| 11474 | Ada-specific operators, returning 0 for *OPLENP and *ARGSP otherwise. */ |
| 11475 | |
| 11476 | static void |
| 11477 | ada_forward_operator_length (struct expression *exp, int pc, |
| 11478 | int *oplenp, int *argsp) |
| 11479 | { |
| 11480 | switch (exp->elts[pc].opcode) |
| 11481 | { |
| 11482 | default: |
| 11483 | *oplenp = *argsp = 0; |
| 11484 | break; |
| 11485 | |
| 11486 | #define OP_DEFN(op, len, args, binop) \ |
| 11487 | case op: *oplenp = len; *argsp = args; break; |
| 11488 | ADA_OPERATORS; |
| 11489 | #undef OP_DEFN |
| 11490 | |
| 11491 | case OP_AGGREGATE: |
| 11492 | *oplenp = 3; |
| 11493 | *argsp = longest_to_int (exp->elts[pc + 1].longconst); |
| 11494 | break; |
| 11495 | |
| 11496 | case OP_CHOICES: |
| 11497 | *oplenp = 3; |
| 11498 | *argsp = longest_to_int (exp->elts[pc + 1].longconst) + 1; |
| 11499 | break; |
| 11500 | |
| 11501 | case OP_STRING: |
| 11502 | case OP_NAME: |
| 11503 | { |
| 11504 | int len = longest_to_int (exp->elts[pc + 1].longconst); |
| 11505 | |
| 11506 | *oplenp = 4 + BYTES_TO_EXP_ELEM (len + 1); |
| 11507 | *argsp = 0; |
| 11508 | break; |
| 11509 | } |
| 11510 | } |
| 11511 | } |
| 11512 | |
| 11513 | static int |
| 11514 | ada_dump_subexp_body (struct expression *exp, struct ui_file *stream, int elt) |
| 11515 | { |
| 11516 | enum exp_opcode op = exp->elts[elt].opcode; |
| 11517 | int oplen, nargs; |
| 11518 | int pc = elt; |
| 11519 | int i; |
| 11520 | |
| 11521 | ada_forward_operator_length (exp, elt, &oplen, &nargs); |
| 11522 | |
| 11523 | switch (op) |
| 11524 | { |
| 11525 | /* Ada attributes ('Foo). */ |
| 11526 | case OP_ATR_FIRST: |
| 11527 | case OP_ATR_LAST: |
| 11528 | case OP_ATR_LENGTH: |
| 11529 | case OP_ATR_IMAGE: |
| 11530 | case OP_ATR_MAX: |
| 11531 | case OP_ATR_MIN: |
| 11532 | case OP_ATR_MODULUS: |
| 11533 | case OP_ATR_POS: |
| 11534 | case OP_ATR_SIZE: |
| 11535 | case OP_ATR_TAG: |
| 11536 | case OP_ATR_VAL: |
| 11537 | break; |
| 11538 | |
| 11539 | case UNOP_IN_RANGE: |
| 11540 | case UNOP_QUAL: |
| 11541 | /* XXX: gdb_sprint_host_address, type_sprint */ |
| 11542 | fprintf_filtered (stream, _("Type @")); |
| 11543 | gdb_print_host_address (exp->elts[pc + 1].type, stream); |
| 11544 | fprintf_filtered (stream, " ("); |
| 11545 | type_print (exp->elts[pc + 1].type, NULL, stream, 0); |
| 11546 | fprintf_filtered (stream, ")"); |
| 11547 | break; |
| 11548 | case BINOP_IN_BOUNDS: |
| 11549 | fprintf_filtered (stream, " (%d)", |
| 11550 | longest_to_int (exp->elts[pc + 2].longconst)); |
| 11551 | break; |
| 11552 | case TERNOP_IN_RANGE: |
| 11553 | break; |
| 11554 | |
| 11555 | case OP_AGGREGATE: |
| 11556 | case OP_OTHERS: |
| 11557 | case OP_DISCRETE_RANGE: |
| 11558 | case OP_POSITIONAL: |
| 11559 | case OP_CHOICES: |
| 11560 | break; |
| 11561 | |
| 11562 | case OP_NAME: |
| 11563 | case OP_STRING: |
| 11564 | { |
| 11565 | char *name = &exp->elts[elt + 2].string; |
| 11566 | int len = longest_to_int (exp->elts[elt + 1].longconst); |
| 11567 | |
| 11568 | fprintf_filtered (stream, "Text: `%.*s'", len, name); |
| 11569 | break; |
| 11570 | } |
| 11571 | |
| 11572 | default: |
| 11573 | return dump_subexp_body_standard (exp, stream, elt); |
| 11574 | } |
| 11575 | |
| 11576 | elt += oplen; |
| 11577 | for (i = 0; i < nargs; i += 1) |
| 11578 | elt = dump_subexp (exp, stream, elt); |
| 11579 | |
| 11580 | return elt; |
| 11581 | } |
| 11582 | |
| 11583 | /* The Ada extension of print_subexp (q.v.). */ |
| 11584 | |
| 11585 | static void |
| 11586 | ada_print_subexp (struct expression *exp, int *pos, |
| 11587 | struct ui_file *stream, enum precedence prec) |
| 11588 | { |
| 11589 | int oplen, nargs, i; |
| 11590 | int pc = *pos; |
| 11591 | enum exp_opcode op = exp->elts[pc].opcode; |
| 11592 | |
| 11593 | ada_forward_operator_length (exp, pc, &oplen, &nargs); |
| 11594 | |
| 11595 | *pos += oplen; |
| 11596 | switch (op) |
| 11597 | { |
| 11598 | default: |
| 11599 | *pos -= oplen; |
| 11600 | print_subexp_standard (exp, pos, stream, prec); |
| 11601 | return; |
| 11602 | |
| 11603 | case OP_VAR_VALUE: |
| 11604 | fputs_filtered (SYMBOL_NATURAL_NAME (exp->elts[pc + 2].symbol), stream); |
| 11605 | return; |
| 11606 | |
| 11607 | case BINOP_IN_BOUNDS: |
| 11608 | /* XXX: sprint_subexp */ |
| 11609 | print_subexp (exp, pos, stream, PREC_SUFFIX); |
| 11610 | fputs_filtered (" in ", stream); |
| 11611 | print_subexp (exp, pos, stream, PREC_SUFFIX); |
| 11612 | fputs_filtered ("'range", stream); |
| 11613 | if (exp->elts[pc + 1].longconst > 1) |
| 11614 | fprintf_filtered (stream, "(%ld)", |
| 11615 | (long) exp->elts[pc + 1].longconst); |
| 11616 | return; |
| 11617 | |
| 11618 | case TERNOP_IN_RANGE: |
| 11619 | if (prec >= PREC_EQUAL) |
| 11620 | fputs_filtered ("(", stream); |
| 11621 | /* XXX: sprint_subexp */ |
| 11622 | print_subexp (exp, pos, stream, PREC_SUFFIX); |
| 11623 | fputs_filtered (" in ", stream); |
| 11624 | print_subexp (exp, pos, stream, PREC_EQUAL); |
| 11625 | fputs_filtered (" .. ", stream); |
| 11626 | print_subexp (exp, pos, stream, PREC_EQUAL); |
| 11627 | if (prec >= PREC_EQUAL) |
| 11628 | fputs_filtered (")", stream); |
| 11629 | return; |
| 11630 | |
| 11631 | case OP_ATR_FIRST: |
| 11632 | case OP_ATR_LAST: |
| 11633 | case OP_ATR_LENGTH: |
| 11634 | case OP_ATR_IMAGE: |
| 11635 | case OP_ATR_MAX: |
| 11636 | case OP_ATR_MIN: |
| 11637 | case OP_ATR_MODULUS: |
| 11638 | case OP_ATR_POS: |
| 11639 | case OP_ATR_SIZE: |
| 11640 | case OP_ATR_TAG: |
| 11641 | case OP_ATR_VAL: |
| 11642 | if (exp->elts[*pos].opcode == OP_TYPE) |
| 11643 | { |
| 11644 | if (TYPE_CODE (exp->elts[*pos + 1].type) != TYPE_CODE_VOID) |
| 11645 | LA_PRINT_TYPE (exp->elts[*pos + 1].type, "", stream, 0, 0); |
| 11646 | *pos += 3; |
| 11647 | } |
| 11648 | else |
| 11649 | print_subexp (exp, pos, stream, PREC_SUFFIX); |
| 11650 | fprintf_filtered (stream, "'%s", ada_attribute_name (op)); |
| 11651 | if (nargs > 1) |
| 11652 | { |
| 11653 | int tem; |
| 11654 | |
| 11655 | for (tem = 1; tem < nargs; tem += 1) |
| 11656 | { |
| 11657 | fputs_filtered ((tem == 1) ? " (" : ", ", stream); |
| 11658 | print_subexp (exp, pos, stream, PREC_ABOVE_COMMA); |
| 11659 | } |
| 11660 | fputs_filtered (")", stream); |
| 11661 | } |
| 11662 | return; |
| 11663 | |
| 11664 | case UNOP_QUAL: |
| 11665 | type_print (exp->elts[pc + 1].type, "", stream, 0); |
| 11666 | fputs_filtered ("'(", stream); |
| 11667 | print_subexp (exp, pos, stream, PREC_PREFIX); |
| 11668 | fputs_filtered (")", stream); |
| 11669 | return; |
| 11670 | |
| 11671 | case UNOP_IN_RANGE: |
| 11672 | /* XXX: sprint_subexp */ |
| 11673 | print_subexp (exp, pos, stream, PREC_SUFFIX); |
| 11674 | fputs_filtered (" in ", stream); |
| 11675 | LA_PRINT_TYPE (exp->elts[pc + 1].type, "", stream, 1, 0); |
| 11676 | return; |
| 11677 | |
| 11678 | case OP_DISCRETE_RANGE: |
| 11679 | print_subexp (exp, pos, stream, PREC_SUFFIX); |
| 11680 | fputs_filtered ("..", stream); |
| 11681 | print_subexp (exp, pos, stream, PREC_SUFFIX); |
| 11682 | return; |
| 11683 | |
| 11684 | case OP_OTHERS: |
| 11685 | fputs_filtered ("others => ", stream); |
| 11686 | print_subexp (exp, pos, stream, PREC_SUFFIX); |
| 11687 | return; |
| 11688 | |
| 11689 | case OP_CHOICES: |
| 11690 | for (i = 0; i < nargs-1; i += 1) |
| 11691 | { |
| 11692 | if (i > 0) |
| 11693 | fputs_filtered ("|", stream); |
| 11694 | print_subexp (exp, pos, stream, PREC_SUFFIX); |
| 11695 | } |
| 11696 | fputs_filtered (" => ", stream); |
| 11697 | print_subexp (exp, pos, stream, PREC_SUFFIX); |
| 11698 | return; |
| 11699 | |
| 11700 | case OP_POSITIONAL: |
| 11701 | print_subexp (exp, pos, stream, PREC_SUFFIX); |
| 11702 | return; |
| 11703 | |
| 11704 | case OP_AGGREGATE: |
| 11705 | fputs_filtered ("(", stream); |
| 11706 | for (i = 0; i < nargs; i += 1) |
| 11707 | { |
| 11708 | if (i > 0) |
| 11709 | fputs_filtered (", ", stream); |
| 11710 | print_subexp (exp, pos, stream, PREC_SUFFIX); |
| 11711 | } |
| 11712 | fputs_filtered (")", stream); |
| 11713 | return; |
| 11714 | } |
| 11715 | } |
| 11716 | |
| 11717 | /* Table mapping opcodes into strings for printing operators |
| 11718 | and precedences of the operators. */ |
| 11719 | |
| 11720 | static const struct op_print ada_op_print_tab[] = { |
| 11721 | {":=", BINOP_ASSIGN, PREC_ASSIGN, 1}, |
| 11722 | {"or else", BINOP_LOGICAL_OR, PREC_LOGICAL_OR, 0}, |
| 11723 | {"and then", BINOP_LOGICAL_AND, PREC_LOGICAL_AND, 0}, |
| 11724 | {"or", BINOP_BITWISE_IOR, PREC_BITWISE_IOR, 0}, |
| 11725 | {"xor", BINOP_BITWISE_XOR, PREC_BITWISE_XOR, 0}, |
| 11726 | {"and", BINOP_BITWISE_AND, PREC_BITWISE_AND, 0}, |
| 11727 | {"=", BINOP_EQUAL, PREC_EQUAL, 0}, |
| 11728 | {"/=", BINOP_NOTEQUAL, PREC_EQUAL, 0}, |
| 11729 | {"<=", BINOP_LEQ, PREC_ORDER, 0}, |
| 11730 | {">=", BINOP_GEQ, PREC_ORDER, 0}, |
| 11731 | {">", BINOP_GTR, PREC_ORDER, 0}, |
| 11732 | {"<", BINOP_LESS, PREC_ORDER, 0}, |
| 11733 | {">>", BINOP_RSH, PREC_SHIFT, 0}, |
| 11734 | {"<<", BINOP_LSH, PREC_SHIFT, 0}, |
| 11735 | {"+", BINOP_ADD, PREC_ADD, 0}, |
| 11736 | {"-", BINOP_SUB, PREC_ADD, 0}, |
| 11737 | {"&", BINOP_CONCAT, PREC_ADD, 0}, |
| 11738 | {"*", BINOP_MUL, PREC_MUL, 0}, |
| 11739 | {"/", BINOP_DIV, PREC_MUL, 0}, |
| 11740 | {"rem", BINOP_REM, PREC_MUL, 0}, |
| 11741 | {"mod", BINOP_MOD, PREC_MUL, 0}, |
| 11742 | {"**", BINOP_EXP, PREC_REPEAT, 0}, |
| 11743 | {"@", BINOP_REPEAT, PREC_REPEAT, 0}, |
| 11744 | {"-", UNOP_NEG, PREC_PREFIX, 0}, |
| 11745 | {"+", UNOP_PLUS, PREC_PREFIX, 0}, |
| 11746 | {"not ", UNOP_LOGICAL_NOT, PREC_PREFIX, 0}, |
| 11747 | {"not ", UNOP_COMPLEMENT, PREC_PREFIX, 0}, |
| 11748 | {"abs ", UNOP_ABS, PREC_PREFIX, 0}, |
| 11749 | {".all", UNOP_IND, PREC_SUFFIX, 1}, |
| 11750 | {"'access", UNOP_ADDR, PREC_SUFFIX, 1}, |
| 11751 | {"'size", OP_ATR_SIZE, PREC_SUFFIX, 1}, |
| 11752 | {NULL, 0, 0, 0} |
| 11753 | }; |
| 11754 | \f |
| 11755 | enum ada_primitive_types { |
| 11756 | ada_primitive_type_int, |
| 11757 | ada_primitive_type_long, |
| 11758 | ada_primitive_type_short, |
| 11759 | ada_primitive_type_char, |
| 11760 | ada_primitive_type_float, |
| 11761 | ada_primitive_type_double, |
| 11762 | ada_primitive_type_void, |
| 11763 | ada_primitive_type_long_long, |
| 11764 | ada_primitive_type_long_double, |
| 11765 | ada_primitive_type_natural, |
| 11766 | ada_primitive_type_positive, |
| 11767 | ada_primitive_type_system_address, |
| 11768 | nr_ada_primitive_types |
| 11769 | }; |
| 11770 | |
| 11771 | static void |
| 11772 | ada_language_arch_info (struct gdbarch *gdbarch, |
| 11773 | struct language_arch_info *lai) |
| 11774 | { |
| 11775 | const struct builtin_type *builtin = builtin_type (gdbarch); |
| 11776 | |
| 11777 | lai->primitive_type_vector |
| 11778 | = GDBARCH_OBSTACK_CALLOC (gdbarch, nr_ada_primitive_types + 1, |
| 11779 | struct type *); |
| 11780 | |
| 11781 | lai->primitive_type_vector [ada_primitive_type_int] |
| 11782 | = arch_integer_type (gdbarch, gdbarch_int_bit (gdbarch), |
| 11783 | 0, "integer"); |
| 11784 | lai->primitive_type_vector [ada_primitive_type_long] |
| 11785 | = arch_integer_type (gdbarch, gdbarch_long_bit (gdbarch), |
| 11786 | 0, "long_integer"); |
| 11787 | lai->primitive_type_vector [ada_primitive_type_short] |
| 11788 | = arch_integer_type (gdbarch, gdbarch_short_bit (gdbarch), |
| 11789 | 0, "short_integer"); |
| 11790 | lai->string_char_type |
| 11791 | = lai->primitive_type_vector [ada_primitive_type_char] |
| 11792 | = arch_integer_type (gdbarch, TARGET_CHAR_BIT, 0, "character"); |
| 11793 | lai->primitive_type_vector [ada_primitive_type_float] |
| 11794 | = arch_float_type (gdbarch, gdbarch_float_bit (gdbarch), |
| 11795 | "float", NULL); |
| 11796 | lai->primitive_type_vector [ada_primitive_type_double] |
| 11797 | = arch_float_type (gdbarch, gdbarch_double_bit (gdbarch), |
| 11798 | "long_float", NULL); |
| 11799 | lai->primitive_type_vector [ada_primitive_type_long_long] |
| 11800 | = arch_integer_type (gdbarch, gdbarch_long_long_bit (gdbarch), |
| 11801 | 0, "long_long_integer"); |
| 11802 | lai->primitive_type_vector [ada_primitive_type_long_double] |
| 11803 | = arch_float_type (gdbarch, gdbarch_double_bit (gdbarch), |
| 11804 | "long_long_float", NULL); |
| 11805 | lai->primitive_type_vector [ada_primitive_type_natural] |
| 11806 | = arch_integer_type (gdbarch, gdbarch_int_bit (gdbarch), |
| 11807 | 0, "natural"); |
| 11808 | lai->primitive_type_vector [ada_primitive_type_positive] |
| 11809 | = arch_integer_type (gdbarch, gdbarch_int_bit (gdbarch), |
| 11810 | 0, "positive"); |
| 11811 | lai->primitive_type_vector [ada_primitive_type_void] |
| 11812 | = builtin->builtin_void; |
| 11813 | |
| 11814 | lai->primitive_type_vector [ada_primitive_type_system_address] |
| 11815 | = lookup_pointer_type (arch_type (gdbarch, TYPE_CODE_VOID, 1, "void")); |
| 11816 | TYPE_NAME (lai->primitive_type_vector [ada_primitive_type_system_address]) |
| 11817 | = "system__address"; |
| 11818 | |
| 11819 | lai->bool_type_symbol = NULL; |
| 11820 | lai->bool_type_default = builtin->builtin_bool; |
| 11821 | } |
| 11822 | \f |
| 11823 | /* Language vector */ |
| 11824 | |
| 11825 | /* Not really used, but needed in the ada_language_defn. */ |
| 11826 | |
| 11827 | static void |
| 11828 | emit_char (int c, struct type *type, struct ui_file *stream, int quoter) |
| 11829 | { |
| 11830 | ada_emit_char (c, type, stream, quoter, 1); |
| 11831 | } |
| 11832 | |
| 11833 | static int |
| 11834 | parse (void) |
| 11835 | { |
| 11836 | warnings_issued = 0; |
| 11837 | return ada_parse (); |
| 11838 | } |
| 11839 | |
| 11840 | static const struct exp_descriptor ada_exp_descriptor = { |
| 11841 | ada_print_subexp, |
| 11842 | ada_operator_length, |
| 11843 | ada_operator_check, |
| 11844 | ada_op_name, |
| 11845 | ada_dump_subexp_body, |
| 11846 | ada_evaluate_subexp |
| 11847 | }; |
| 11848 | |
| 11849 | const struct language_defn ada_language_defn = { |
| 11850 | "ada", /* Language name */ |
| 11851 | language_ada, |
| 11852 | range_check_off, |
| 11853 | type_check_off, |
| 11854 | case_sensitive_on, /* Yes, Ada is case-insensitive, but |
| 11855 | that's not quite what this means. */ |
| 11856 | array_row_major, |
| 11857 | macro_expansion_no, |
| 11858 | &ada_exp_descriptor, |
| 11859 | parse, |
| 11860 | ada_error, |
| 11861 | resolve, |
| 11862 | ada_printchar, /* Print a character constant */ |
| 11863 | ada_printstr, /* Function to print string constant */ |
| 11864 | emit_char, /* Function to print single char (not used) */ |
| 11865 | ada_print_type, /* Print a type using appropriate syntax */ |
| 11866 | ada_print_typedef, /* Print a typedef using appropriate syntax */ |
| 11867 | ada_val_print, /* Print a value using appropriate syntax */ |
| 11868 | ada_value_print, /* Print a top-level value */ |
| 11869 | NULL, /* Language specific skip_trampoline */ |
| 11870 | NULL, /* name_of_this */ |
| 11871 | ada_lookup_symbol_nonlocal, /* Looking up non-local symbols. */ |
| 11872 | basic_lookup_transparent_type, /* lookup_transparent_type */ |
| 11873 | ada_la_decode, /* Language specific symbol demangler */ |
| 11874 | NULL, /* Language specific |
| 11875 | class_name_from_physname */ |
| 11876 | ada_op_print_tab, /* expression operators for printing */ |
| 11877 | 0, /* c-style arrays */ |
| 11878 | 1, /* String lower bound */ |
| 11879 | ada_get_gdb_completer_word_break_characters, |
| 11880 | ada_make_symbol_completion_list, |
| 11881 | ada_language_arch_info, |
| 11882 | ada_print_array_index, |
| 11883 | default_pass_by_reference, |
| 11884 | c_get_string, |
| 11885 | LANG_MAGIC |
| 11886 | }; |
| 11887 | |
| 11888 | /* Provide a prototype to silence -Wmissing-prototypes. */ |
| 11889 | extern initialize_file_ftype _initialize_ada_language; |
| 11890 | |
| 11891 | /* Command-list for the "set/show ada" prefix command. */ |
| 11892 | static struct cmd_list_element *set_ada_list; |
| 11893 | static struct cmd_list_element *show_ada_list; |
| 11894 | |
| 11895 | /* Implement the "set ada" prefix command. */ |
| 11896 | |
| 11897 | static void |
| 11898 | set_ada_command (char *arg, int from_tty) |
| 11899 | { |
| 11900 | printf_unfiltered (_(\ |
| 11901 | "\"set ada\" must be followed by the name of a setting.\n")); |
| 11902 | help_list (set_ada_list, "set ada ", -1, gdb_stdout); |
| 11903 | } |
| 11904 | |
| 11905 | /* Implement the "show ada" prefix command. */ |
| 11906 | |
| 11907 | static void |
| 11908 | show_ada_command (char *args, int from_tty) |
| 11909 | { |
| 11910 | cmd_show_list (show_ada_list, from_tty, ""); |
| 11911 | } |
| 11912 | |
| 11913 | void |
| 11914 | _initialize_ada_language (void) |
| 11915 | { |
| 11916 | add_language (&ada_language_defn); |
| 11917 | |
| 11918 | add_prefix_cmd ("ada", no_class, set_ada_command, |
| 11919 | _("Prefix command for changing Ada-specfic settings"), |
| 11920 | &set_ada_list, "set ada ", 0, &setlist); |
| 11921 | |
| 11922 | add_prefix_cmd ("ada", no_class, show_ada_command, |
| 11923 | _("Generic command for showing Ada-specific settings."), |
| 11924 | &show_ada_list, "show ada ", 0, &showlist); |
| 11925 | |
| 11926 | add_setshow_boolean_cmd ("trust-PAD-over-XVS", class_obscure, |
| 11927 | &trust_pad_over_xvs, _("\ |
| 11928 | Enable or disable an optimization trusting PAD types over XVS types"), _("\ |
| 11929 | Show whether an optimization trusting PAD types over XVS types is activated"), |
| 11930 | _("\ |
| 11931 | This is related to the encoding used by the GNAT compiler. The debugger\n\ |
| 11932 | should normally trust the contents of PAD types, but certain older versions\n\ |
| 11933 | of GNAT have a bug that sometimes causes the information in the PAD type\n\ |
| 11934 | to be incorrect. Turning this setting \"off\" allows the debugger to\n\ |
| 11935 | work around this bug. It is always safe to turn this option \"off\", but\n\ |
| 11936 | this incurs a slight performance penalty, so it is recommended to NOT change\n\ |
| 11937 | this option to \"off\" unless necessary."), |
| 11938 | NULL, NULL, &set_ada_list, &show_ada_list); |
| 11939 | |
| 11940 | varsize_limit = 65536; |
| 11941 | |
| 11942 | obstack_init (&symbol_list_obstack); |
| 11943 | |
| 11944 | decoded_names_store = htab_create_alloc |
| 11945 | (256, htab_hash_string, (int (*)(const void *, const void *)) streq, |
| 11946 | NULL, xcalloc, xfree); |
| 11947 | |
| 11948 | observer_attach_executable_changed (ada_executable_changed_observer); |
| 11949 | |
| 11950 | /* Setup per-inferior data. */ |
| 11951 | observer_attach_inferior_exit (ada_inferior_exit); |
| 11952 | ada_inferior_data |
| 11953 | = register_inferior_data_with_cleanup (ada_inferior_data_cleanup); |
| 11954 | } |