1 /* Support for printing Modula 2 types for GDB, the GNU debugger. 2 Copyright (C) 1986-2013 Free Software Foundation, Inc. 3 4 This file is part of GDB. 5 6 This program is free software; you can redistribute it and/or modify 7 it under the terms of the GNU General Public License as published by 8 the Free Software Foundation; either version 3 of the License, or 9 (at your option) any later version. 10 11 This program is distributed in the hope that it will be useful, 12 but WITHOUT ANY WARRANTY; without even the implied warranty of 13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 14 GNU General Public License for more details. 15 16 You should have received a copy of the GNU General Public License 17 along with this program. If not, see <http://www.gnu.org/licenses/>. */ 18 19 #include "defs.h" 20 #include "gdb_obstack.h" 21 #include "bfd.h" /* Binary File Description */ 22 #include "symtab.h" 23 #include "gdbtypes.h" 24 #include "expression.h" 25 #include "value.h" 26 #include "gdbcore.h" 27 #include "m2-lang.h" 28 #include "target.h" 29 #include "language.h" 30 #include "demangle.h" 31 #include "c-lang.h" 32 #include "typeprint.h" 33 #include "cp-abi.h" 34 35 #include "gdb_string.h" 36 #include <errno.h> 37 38 static void m2_print_bounds (struct type *type, 39 struct ui_file *stream, int show, int level, 40 int print_high); 41 42 static void m2_typedef (struct type *, struct ui_file *, int, int, 43 const struct type_print_options *); 44 static void m2_array (struct type *, struct ui_file *, int, int, 45 const struct type_print_options *); 46 static void m2_pointer (struct type *, struct ui_file *, int, int, 47 const struct type_print_options *); 48 static void m2_ref (struct type *, struct ui_file *, int, int, 49 const struct type_print_options *); 50 static void m2_procedure (struct type *, struct ui_file *, int, int, 51 const struct type_print_options *); 52 static void m2_union (struct type *, struct ui_file *); 53 static void m2_enum (struct type *, struct ui_file *, int, int); 54 static void m2_range (struct type *, struct ui_file *, int, int, 55 const struct type_print_options *); 56 static void m2_type_name (struct type *type, struct ui_file *stream); 57 static void m2_short_set (struct type *type, struct ui_file *stream, 58 int show, int level); 59 static int m2_long_set (struct type *type, struct ui_file *stream, 60 int show, int level, const struct type_print_options *flags); 61 static int m2_unbounded_array (struct type *type, struct ui_file *stream, 62 int show, int level, 63 const struct type_print_options *flags); 64 static void m2_record_fields (struct type *type, struct ui_file *stream, 65 int show, int level, const struct type_print_options *flags); 66 static void m2_unknown (const char *s, struct type *type, 67 struct ui_file *stream, int show, int level); 68 69 int m2_is_long_set (struct type *type); 70 int m2_is_long_set_of_type (struct type *type, struct type **of_type); 71 int m2_is_unbounded_array (struct type *type); 72 73 74 void 75 m2_print_type (struct type *type, const char *varstring, 76 struct ui_file *stream, 77 int show, int level, 78 const struct type_print_options *flags) 79 { 80 CHECK_TYPEDEF (type); 81 82 QUIT; 83 84 wrap_here (" "); 85 if (type == NULL) 86 { 87 fputs_filtered (_("<type unknown>"), stream); 88 return; 89 } 90 91 switch (TYPE_CODE (type)) 92 { 93 case TYPE_CODE_SET: 94 m2_short_set(type, stream, show, level); 95 break; 96 97 case TYPE_CODE_STRUCT: 98 if (m2_long_set (type, stream, show, level, flags) 99 || m2_unbounded_array (type, stream, show, level, flags)) 100 break; 101 m2_record_fields (type, stream, show, level, flags); 102 break; 103 104 case TYPE_CODE_TYPEDEF: 105 m2_typedef (type, stream, show, level, flags); 106 break; 107 108 case TYPE_CODE_ARRAY: 109 m2_array (type, stream, show, level, flags); 110 break; 111 112 case TYPE_CODE_PTR: 113 m2_pointer (type, stream, show, level, flags); 114 break; 115 116 case TYPE_CODE_REF: 117 m2_ref (type, stream, show, level, flags); 118 break; 119 120 case TYPE_CODE_METHOD: 121 m2_unknown (_("method"), type, stream, show, level); 122 break; 123 124 case TYPE_CODE_FUNC: 125 m2_procedure (type, stream, show, level, flags); 126 break; 127 128 case TYPE_CODE_UNION: 129 m2_union (type, stream); 130 break; 131 132 case TYPE_CODE_ENUM: 133 m2_enum (type, stream, show, level); 134 break; 135 136 case TYPE_CODE_VOID: 137 break; 138 139 case TYPE_CODE_UNDEF: 140 /* i18n: Do not translate the "struct" part! */ 141 m2_unknown (_("undef"), type, stream, show, level); 142 break; 143 144 case TYPE_CODE_ERROR: 145 m2_unknown (_("error"), type, stream, show, level); 146 break; 147 148 case TYPE_CODE_RANGE: 149 m2_range (type, stream, show, level, flags); 150 break; 151 152 default: 153 m2_type_name (type, stream); 154 break; 155 } 156 } 157 158 /* Print a typedef using M2 syntax. TYPE is the underlying type. 159 NEW_SYMBOL is the symbol naming the type. STREAM is the stream on 160 which to print. */ 161 162 void 163 m2_print_typedef (struct type *type, struct symbol *new_symbol, 164 struct ui_file *stream) 165 { 166 CHECK_TYPEDEF (type); 167 fprintf_filtered (stream, "TYPE "); 168 if (!TYPE_NAME (SYMBOL_TYPE (new_symbol)) 169 || strcmp (TYPE_NAME ((SYMBOL_TYPE (new_symbol))), 170 SYMBOL_LINKAGE_NAME (new_symbol)) != 0) 171 fprintf_filtered (stream, "%s = ", SYMBOL_PRINT_NAME (new_symbol)); 172 else 173 fprintf_filtered (stream, "<builtin> = "); 174 type_print (type, "", stream, 0); 175 fprintf_filtered (stream, ";\n"); 176 } 177 178 /* m2_type_name - if a, type, has a name then print it. */ 179 180 void 181 m2_type_name (struct type *type, struct ui_file *stream) 182 { 183 if (TYPE_NAME (type) != NULL) 184 fputs_filtered (TYPE_NAME (type), stream); 185 } 186 187 /* m2_range - displays a Modula-2 subrange type. */ 188 189 void 190 m2_range (struct type *type, struct ui_file *stream, int show, 191 int level, const struct type_print_options *flags) 192 { 193 if (TYPE_HIGH_BOUND (type) == TYPE_LOW_BOUND (type)) 194 m2_print_type (TYPE_DOMAIN_TYPE (type), "", stream, show, level, 195 flags); 196 else 197 { 198 struct type *target = TYPE_TARGET_TYPE (type); 199 200 fprintf_filtered (stream, "["); 201 print_type_scalar (target, TYPE_LOW_BOUND (type), stream); 202 fprintf_filtered (stream, ".."); 203 print_type_scalar (target, TYPE_HIGH_BOUND (type), stream); 204 fprintf_filtered (stream, "]"); 205 } 206 } 207 208 static void 209 m2_typedef (struct type *type, struct ui_file *stream, int show, 210 int level, const struct type_print_options *flags) 211 { 212 if (TYPE_NAME (type) != NULL) 213 { 214 fputs_filtered (TYPE_NAME (type), stream); 215 fputs_filtered (" = ", stream); 216 } 217 m2_print_type (TYPE_TARGET_TYPE (type), "", stream, show, level, flags); 218 } 219 220 /* m2_array - prints out a Modula-2 ARRAY ... OF type. */ 221 222 static void m2_array (struct type *type, struct ui_file *stream, 223 int show, int level, const struct type_print_options *flags) 224 { 225 fprintf_filtered (stream, "ARRAY ["); 226 if (TYPE_LENGTH (TYPE_TARGET_TYPE (type)) > 0 227 && !TYPE_ARRAY_UPPER_BOUND_IS_UNDEFINED (type)) 228 { 229 if (TYPE_INDEX_TYPE (type) != 0) 230 { 231 m2_print_bounds (TYPE_INDEX_TYPE (type), stream, show, -1, 0); 232 fprintf_filtered (stream, ".."); 233 m2_print_bounds (TYPE_INDEX_TYPE (type), stream, show, -1, 1); 234 } 235 else 236 fprintf_filtered (stream, "%d", 237 (TYPE_LENGTH (type) 238 / TYPE_LENGTH (TYPE_TARGET_TYPE (type)))); 239 } 240 fprintf_filtered (stream, "] OF "); 241 m2_print_type (TYPE_TARGET_TYPE (type), "", stream, show, level, flags); 242 } 243 244 static void 245 m2_pointer (struct type *type, struct ui_file *stream, int show, 246 int level, const struct type_print_options *flags) 247 { 248 if (TYPE_CONST (type)) 249 fprintf_filtered (stream, "[...] : "); 250 else 251 fprintf_filtered (stream, "POINTER TO "); 252 253 m2_print_type (TYPE_TARGET_TYPE (type), "", stream, show, level, flags); 254 } 255 256 static void 257 m2_ref (struct type *type, struct ui_file *stream, int show, 258 int level, const struct type_print_options *flags) 259 { 260 fprintf_filtered (stream, "VAR"); 261 m2_print_type (TYPE_TARGET_TYPE (type), "", stream, show, level, flags); 262 } 263 264 static void 265 m2_unknown (const char *s, struct type *type, struct ui_file *stream, 266 int show, int level) 267 { 268 fprintf_filtered (stream, "%s %s", s, _("is unknown")); 269 } 270 271 static void m2_union (struct type *type, struct ui_file *stream) 272 { 273 fprintf_filtered (stream, "union"); 274 } 275 276 static void 277 m2_procedure (struct type *type, struct ui_file *stream, 278 int show, int level, const struct type_print_options *flags) 279 { 280 fprintf_filtered (stream, "PROCEDURE "); 281 m2_type_name (type, stream); 282 if (TYPE_CODE (TYPE_TARGET_TYPE (type)) != TYPE_CODE_VOID) 283 { 284 int i, len = TYPE_NFIELDS (type); 285 286 fprintf_filtered (stream, " ("); 287 for (i = 0; i < len; i++) 288 { 289 if (i > 0) 290 { 291 fputs_filtered (", ", stream); 292 wrap_here (" "); 293 } 294 m2_print_type (TYPE_FIELD_TYPE (type, i), "", stream, -1, 0, flags); 295 } 296 if (TYPE_TARGET_TYPE (type) != NULL) 297 { 298 fprintf_filtered (stream, " : "); 299 m2_print_type (TYPE_TARGET_TYPE (type), "", stream, 0, 0, flags); 300 } 301 } 302 } 303 304 static void 305 m2_print_bounds (struct type *type, 306 struct ui_file *stream, int show, int level, 307 int print_high) 308 { 309 struct type *target = TYPE_TARGET_TYPE (type); 310 311 if (TYPE_NFIELDS(type) == 0) 312 return; 313 314 if (print_high) 315 print_type_scalar (target, TYPE_HIGH_BOUND (type), stream); 316 else 317 print_type_scalar (target, TYPE_LOW_BOUND (type), stream); 318 } 319 320 static void 321 m2_short_set (struct type *type, struct ui_file *stream, int show, int level) 322 { 323 fprintf_filtered(stream, "SET ["); 324 m2_print_bounds (TYPE_INDEX_TYPE (type), stream, 325 show - 1, level, 0); 326 327 fprintf_filtered(stream, ".."); 328 m2_print_bounds (TYPE_INDEX_TYPE (type), stream, 329 show - 1, level, 1); 330 fprintf_filtered(stream, "]"); 331 } 332 333 int 334 m2_is_long_set (struct type *type) 335 { 336 LONGEST previous_high = 0; /* Unnecessary initialization 337 keeps gcc -Wall happy. */ 338 int len, i; 339 struct type *range; 340 341 if (TYPE_CODE (type) == TYPE_CODE_STRUCT) 342 { 343 344 /* check if all fields of the RECORD are consecutive sets. */ 345 346 len = TYPE_NFIELDS (type); 347 for (i = TYPE_N_BASECLASSES (type); i < len; i++) 348 { 349 if (TYPE_FIELD_TYPE (type, i) == NULL) 350 return 0; 351 if (TYPE_CODE (TYPE_FIELD_TYPE (type, i)) != TYPE_CODE_SET) 352 return 0; 353 if (TYPE_FIELD_NAME (type, i) != NULL 354 && (strcmp (TYPE_FIELD_NAME (type, i), "") != 0)) 355 return 0; 356 range = TYPE_INDEX_TYPE (TYPE_FIELD_TYPE (type, i)); 357 if ((i > TYPE_N_BASECLASSES (type)) 358 && previous_high + 1 != TYPE_LOW_BOUND (range)) 359 return 0; 360 previous_high = TYPE_HIGH_BOUND (range); 361 } 362 return len>0; 363 } 364 return 0; 365 } 366 367 /* m2_get_discrete_bounds - a wrapper for get_discrete_bounds which 368 understands that CHARs might be signed. 369 This should be integrated into gdbtypes.c 370 inside get_discrete_bounds. */ 371 372 static int 373 m2_get_discrete_bounds (struct type *type, LONGEST *lowp, LONGEST *highp) 374 { 375 CHECK_TYPEDEF (type); 376 switch (TYPE_CODE (type)) 377 { 378 case TYPE_CODE_CHAR: 379 if (TYPE_LENGTH (type) < sizeof (LONGEST)) 380 { 381 if (!TYPE_UNSIGNED (type)) 382 { 383 *lowp = -(1 << (TYPE_LENGTH (type) * TARGET_CHAR_BIT - 1)); 384 *highp = -*lowp - 1; 385 return 0; 386 } 387 } 388 /* fall through */ 389 default: 390 return get_discrete_bounds (type, lowp, highp); 391 } 392 } 393 394 /* m2_is_long_set_of_type - returns TRUE if the long set was declared as 395 SET OF <oftype> of_type is assigned to the 396 subtype. */ 397 398 int 399 m2_is_long_set_of_type (struct type *type, struct type **of_type) 400 { 401 int len, i; 402 struct type *range; 403 struct type *target; 404 LONGEST l1, l2; 405 LONGEST h1, h2; 406 407 if (TYPE_CODE (type) == TYPE_CODE_STRUCT) 408 { 409 len = TYPE_NFIELDS (type); 410 i = TYPE_N_BASECLASSES (type); 411 if (len == 0) 412 return 0; 413 range = TYPE_INDEX_TYPE (TYPE_FIELD_TYPE (type, i)); 414 target = TYPE_TARGET_TYPE (range); 415 416 l1 = TYPE_LOW_BOUND (TYPE_INDEX_TYPE (TYPE_FIELD_TYPE (type, i))); 417 h1 = TYPE_HIGH_BOUND (TYPE_INDEX_TYPE (TYPE_FIELD_TYPE (type, len-1))); 418 *of_type = target; 419 if (m2_get_discrete_bounds (target, &l2, &h2) >= 0) 420 return (l1 == l2 && h1 == h2); 421 error (_("long_set failed to find discrete bounds for its subtype")); 422 return 0; 423 } 424 error (_("expecting long_set")); 425 return 0; 426 } 427 428 static int 429 m2_long_set (struct type *type, struct ui_file *stream, int show, int level, 430 const struct type_print_options *flags) 431 { 432 struct type *of_type; 433 int i; 434 int len = TYPE_NFIELDS (type); 435 LONGEST low; 436 LONGEST high; 437 438 if (m2_is_long_set (type)) 439 { 440 if (TYPE_TAG_NAME (type) != NULL) 441 { 442 fputs_filtered (TYPE_TAG_NAME (type), stream); 443 if (show == 0) 444 return 1; 445 } 446 else if (TYPE_NAME (type) != NULL) 447 { 448 fputs_filtered (TYPE_NAME (type), stream); 449 if (show == 0) 450 return 1; 451 } 452 453 if (TYPE_TAG_NAME (type) != NULL || TYPE_NAME (type) != NULL) 454 fputs_filtered (" = ", stream); 455 456 if (get_long_set_bounds (type, &low, &high)) 457 { 458 fprintf_filtered(stream, "SET OF "); 459 i = TYPE_N_BASECLASSES (type); 460 if (m2_is_long_set_of_type (type, &of_type)) 461 m2_print_type (of_type, "", stream, show - 1, level, flags); 462 else 463 { 464 fprintf_filtered(stream, "["); 465 m2_print_bounds (TYPE_INDEX_TYPE (TYPE_FIELD_TYPE (type, i)), 466 stream, show - 1, level, 0); 467 468 fprintf_filtered(stream, ".."); 469 470 m2_print_bounds (TYPE_INDEX_TYPE (TYPE_FIELD_TYPE (type, len-1)), 471 stream, show - 1, level, 1); 472 fprintf_filtered(stream, "]"); 473 } 474 } 475 else 476 /* i18n: Do not translate the "SET OF" part! */ 477 fprintf_filtered(stream, _("SET OF <unknown>")); 478 479 return 1; 480 } 481 return 0; 482 } 483 484 /* m2_is_unbounded_array - returns TRUE if, type, should be regarded 485 as a Modula-2 unbounded ARRAY type. */ 486 487 int 488 m2_is_unbounded_array (struct type *type) 489 { 490 if (TYPE_CODE (type) == TYPE_CODE_STRUCT) 491 { 492 /* 493 * check if we have a structure with exactly two fields named 494 * _m2_contents and _m2_high. It also checks to see if the 495 * type of _m2_contents is a pointer. The TYPE_TARGET_TYPE 496 * of the pointer determines the unbounded ARRAY OF type. 497 */ 498 if (TYPE_NFIELDS (type) != 2) 499 return 0; 500 if (strcmp (TYPE_FIELD_NAME (type, 0), "_m2_contents") != 0) 501 return 0; 502 if (strcmp (TYPE_FIELD_NAME (type, 1), "_m2_high") != 0) 503 return 0; 504 if (TYPE_CODE (TYPE_FIELD_TYPE (type, 0)) != TYPE_CODE_PTR) 505 return 0; 506 return 1; 507 } 508 return 0; 509 } 510 511 /* m2_unbounded_array - if the struct type matches a Modula-2 unbounded 512 parameter type then display the type as an 513 ARRAY OF type. Returns TRUE if an unbounded 514 array type was detected. */ 515 516 static int 517 m2_unbounded_array (struct type *type, struct ui_file *stream, int show, 518 int level, const struct type_print_options *flags) 519 { 520 if (m2_is_unbounded_array (type)) 521 { 522 if (show > 0) 523 { 524 fputs_filtered ("ARRAY OF ", stream); 525 m2_print_type (TYPE_TARGET_TYPE (TYPE_FIELD_TYPE (type, 0)), 526 "", stream, 0, level, flags); 527 } 528 return 1; 529 } 530 return 0; 531 } 532 533 void 534 m2_record_fields (struct type *type, struct ui_file *stream, int show, 535 int level, const struct type_print_options *flags) 536 { 537 /* Print the tag if it exists. */ 538 if (TYPE_TAG_NAME (type) != NULL) 539 { 540 if (strncmp (TYPE_TAG_NAME (type), "$$", 2) != 0) 541 { 542 fputs_filtered (TYPE_TAG_NAME (type), stream); 543 if (show > 0) 544 fprintf_filtered (stream, " = "); 545 } 546 } 547 wrap_here (" "); 548 if (show < 0) 549 { 550 if (TYPE_CODE (type) == TYPE_CODE_STRUCT) 551 fprintf_filtered (stream, "RECORD ... END "); 552 else if (TYPE_CODE (type) == TYPE_CODE_UNION) 553 fprintf_filtered (stream, "CASE ... END "); 554 } 555 else if (show > 0) 556 { 557 int i; 558 int len = TYPE_NFIELDS (type); 559 560 if (TYPE_CODE (type) == TYPE_CODE_STRUCT) 561 fprintf_filtered (stream, "RECORD\n"); 562 else if (TYPE_CODE (type) == TYPE_CODE_UNION) 563 /* i18n: Do not translate "CASE" and "OF". */ 564 fprintf_filtered (stream, _("CASE <variant> OF\n")); 565 566 for (i = TYPE_N_BASECLASSES (type); i < len; i++) 567 { 568 QUIT; 569 570 print_spaces_filtered (level + 4, stream); 571 fputs_filtered (TYPE_FIELD_NAME (type, i), stream); 572 fputs_filtered (" : ", stream); 573 m2_print_type (TYPE_FIELD_TYPE (type, i), 574 "", 575 stream, 0, level + 4, flags); 576 if (TYPE_FIELD_PACKED (type, i)) 577 { 578 /* It is a bitfield. This code does not attempt 579 to look at the bitpos and reconstruct filler, 580 unnamed fields. This would lead to misleading 581 results if the compiler does not put out fields 582 for such things (I don't know what it does). */ 583 fprintf_filtered (stream, " : %d", 584 TYPE_FIELD_BITSIZE (type, i)); 585 } 586 fprintf_filtered (stream, ";\n"); 587 } 588 589 fprintfi_filtered (level, stream, "END "); 590 } 591 } 592 593 void 594 m2_enum (struct type *type, struct ui_file *stream, int show, int level) 595 { 596 LONGEST lastval; 597 int i, len; 598 599 if (show < 0) 600 { 601 /* If we just printed a tag name, no need to print anything else. */ 602 if (TYPE_TAG_NAME (type) == NULL) 603 fprintf_filtered (stream, "(...)"); 604 } 605 else if (show > 0 || TYPE_TAG_NAME (type) == NULL) 606 { 607 fprintf_filtered (stream, "("); 608 len = TYPE_NFIELDS (type); 609 lastval = 0; 610 for (i = 0; i < len; i++) 611 { 612 QUIT; 613 if (i > 0) 614 fprintf_filtered (stream, ", "); 615 wrap_here (" "); 616 fputs_filtered (TYPE_FIELD_NAME (type, i), stream); 617 if (lastval != TYPE_FIELD_ENUMVAL (type, i)) 618 { 619 fprintf_filtered (stream, " = %s", 620 plongest (TYPE_FIELD_ENUMVAL (type, i))); 621 lastval = TYPE_FIELD_ENUMVAL (type, i); 622 } 623 lastval++; 624 } 625 fprintf_filtered (stream, ")"); 626 } 627 } 628