| 1 | /* Support for printing C values for GDB, the GNU debugger. |
| 2 | Copyright 1986, 1988, 1989, 1991-1997, 2000 |
| 3 | Free Software Foundation, Inc. |
| 4 | |
| 5 | This file is part of GDB. |
| 6 | |
| 7 | This program is free software; you can redistribute it and/or modify |
| 8 | it under the terms of the GNU General Public License as published by |
| 9 | the Free Software Foundation; either version 2 of the License, or |
| 10 | (at your option) any later version. |
| 11 | |
| 12 | This program is distributed in the hope that it will be useful, |
| 13 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 15 | GNU General Public License for more details. |
| 16 | |
| 17 | You should have received a copy of the GNU General Public License |
| 18 | along with this program; if not, write to the Free Software |
| 19 | Foundation, Inc., 59 Temple Place - Suite 330, |
| 20 | Boston, MA 02111-1307, USA. */ |
| 21 | |
| 22 | #include "defs.h" |
| 23 | #include "symtab.h" |
| 24 | #include "gdbtypes.h" |
| 25 | #include "expression.h" |
| 26 | #include "value.h" |
| 27 | #include "demangle.h" |
| 28 | #include "valprint.h" |
| 29 | #include "language.h" |
| 30 | #include "c-lang.h" |
| 31 | \f |
| 32 | |
| 33 | /* Print data of type TYPE located at VALADDR (within GDB), which came from |
| 34 | the inferior at address ADDRESS, onto stdio stream STREAM according to |
| 35 | FORMAT (a letter or 0 for natural format). The data at VALADDR is in |
| 36 | target byte order. |
| 37 | |
| 38 | If the data are a string pointer, returns the number of string characters |
| 39 | printed. |
| 40 | |
| 41 | If DEREF_REF is nonzero, then dereference references, otherwise just print |
| 42 | them like pointers. |
| 43 | |
| 44 | The PRETTY parameter controls prettyprinting. */ |
| 45 | |
| 46 | int |
| 47 | c_val_print (type, valaddr, embedded_offset, address, stream, format, deref_ref, recurse, |
| 48 | pretty) |
| 49 | struct type *type; |
| 50 | char *valaddr; |
| 51 | int embedded_offset; |
| 52 | CORE_ADDR address; |
| 53 | struct ui_file *stream; |
| 54 | int format; |
| 55 | int deref_ref; |
| 56 | int recurse; |
| 57 | enum val_prettyprint pretty; |
| 58 | { |
| 59 | register unsigned int i = 0; /* Number of characters printed */ |
| 60 | unsigned len; |
| 61 | struct type *elttype; |
| 62 | unsigned eltlen; |
| 63 | LONGEST val; |
| 64 | CORE_ADDR addr; |
| 65 | |
| 66 | CHECK_TYPEDEF (type); |
| 67 | switch (TYPE_CODE (type)) |
| 68 | { |
| 69 | case TYPE_CODE_ARRAY: |
| 70 | elttype = check_typedef (TYPE_TARGET_TYPE (type)); |
| 71 | if (TYPE_LENGTH (type) > 0 && TYPE_LENGTH (TYPE_TARGET_TYPE (type)) > 0) |
| 72 | { |
| 73 | eltlen = TYPE_LENGTH (elttype); |
| 74 | len = TYPE_LENGTH (type) / eltlen; |
| 75 | if (prettyprint_arrays) |
| 76 | { |
| 77 | print_spaces_filtered (2 + 2 * recurse, stream); |
| 78 | } |
| 79 | /* For an array of chars, print with string syntax. */ |
| 80 | if (eltlen == 1 && |
| 81 | ((TYPE_CODE (elttype) == TYPE_CODE_INT) |
| 82 | || ((current_language->la_language == language_m2) |
| 83 | && (TYPE_CODE (elttype) == TYPE_CODE_CHAR))) |
| 84 | && (format == 0 || format == 's')) |
| 85 | { |
| 86 | /* If requested, look for the first null char and only print |
| 87 | elements up to it. */ |
| 88 | if (stop_print_at_null) |
| 89 | { |
| 90 | unsigned int temp_len; |
| 91 | |
| 92 | /* Look for a NULL char. */ |
| 93 | for (temp_len = 0; |
| 94 | (valaddr + embedded_offset)[temp_len] |
| 95 | && temp_len < len && temp_len < print_max; |
| 96 | temp_len++); |
| 97 | len = temp_len; |
| 98 | } |
| 99 | |
| 100 | LA_PRINT_STRING (stream, valaddr + embedded_offset, len, eltlen, 0); |
| 101 | i = len; |
| 102 | } |
| 103 | else |
| 104 | { |
| 105 | fprintf_filtered (stream, "{"); |
| 106 | /* If this is a virtual function table, print the 0th |
| 107 | entry specially, and the rest of the members normally. */ |
| 108 | if (cp_is_vtbl_ptr_type (elttype)) |
| 109 | { |
| 110 | i = 1; |
| 111 | fprintf_filtered (stream, "%d vtable entries", len - 1); |
| 112 | } |
| 113 | else |
| 114 | { |
| 115 | i = 0; |
| 116 | } |
| 117 | val_print_array_elements (type, valaddr + embedded_offset, address, stream, |
| 118 | format, deref_ref, recurse, pretty, i); |
| 119 | fprintf_filtered (stream, "}"); |
| 120 | } |
| 121 | break; |
| 122 | } |
| 123 | /* Array of unspecified length: treat like pointer to first elt. */ |
| 124 | addr = address; |
| 125 | goto print_unpacked_pointer; |
| 126 | |
| 127 | case TYPE_CODE_PTR: |
| 128 | if (format && format != 's') |
| 129 | { |
| 130 | print_scalar_formatted (valaddr + embedded_offset, type, format, 0, stream); |
| 131 | break; |
| 132 | } |
| 133 | if (vtblprint && cp_is_vtbl_ptr_type (type)) |
| 134 | { |
| 135 | /* Print the unmangled name if desired. */ |
| 136 | /* Print vtable entry - we only get here if we ARE using |
| 137 | -fvtable_thunks. (Otherwise, look under TYPE_CODE_STRUCT.) */ |
| 138 | print_address_demangle (extract_address (valaddr + embedded_offset, TYPE_LENGTH (type)), |
| 139 | stream, demangle); |
| 140 | break; |
| 141 | } |
| 142 | elttype = check_typedef (TYPE_TARGET_TYPE (type)); |
| 143 | if (TYPE_CODE (elttype) == TYPE_CODE_METHOD) |
| 144 | { |
| 145 | cp_print_class_method (valaddr + embedded_offset, type, stream); |
| 146 | } |
| 147 | else if (TYPE_CODE (elttype) == TYPE_CODE_MEMBER) |
| 148 | { |
| 149 | cp_print_class_member (valaddr + embedded_offset, |
| 150 | TYPE_DOMAIN_TYPE (TYPE_TARGET_TYPE (type)), |
| 151 | stream, "&"); |
| 152 | } |
| 153 | else |
| 154 | { |
| 155 | addr = unpack_pointer (type, valaddr + embedded_offset); |
| 156 | print_unpacked_pointer: |
| 157 | elttype = check_typedef (TYPE_TARGET_TYPE (type)); |
| 158 | |
| 159 | if (TYPE_CODE (elttype) == TYPE_CODE_FUNC) |
| 160 | { |
| 161 | /* Try to print what function it points to. */ |
| 162 | print_address_demangle (addr, stream, demangle); |
| 163 | /* Return value is irrelevant except for string pointers. */ |
| 164 | return (0); |
| 165 | } |
| 166 | |
| 167 | if (addressprint && format != 's') |
| 168 | { |
| 169 | print_address_numeric (addr, 1, stream); |
| 170 | } |
| 171 | |
| 172 | /* For a pointer to char or unsigned char, also print the string |
| 173 | pointed to, unless pointer is null. */ |
| 174 | /* FIXME: need to handle wchar_t here... */ |
| 175 | |
| 176 | if (TYPE_LENGTH (elttype) == 1 |
| 177 | && TYPE_CODE (elttype) == TYPE_CODE_INT |
| 178 | && (format == 0 || format == 's') |
| 179 | && addr != 0) |
| 180 | { |
| 181 | i = val_print_string (addr, -1, TYPE_LENGTH (elttype), stream); |
| 182 | } |
| 183 | else if (cp_is_vtbl_member (type)) |
| 184 | { |
| 185 | /* print vtbl's nicely */ |
| 186 | CORE_ADDR vt_address = unpack_pointer (type, valaddr + embedded_offset); |
| 187 | |
| 188 | struct minimal_symbol *msymbol = |
| 189 | lookup_minimal_symbol_by_pc (vt_address); |
| 190 | if ((msymbol != NULL) && |
| 191 | (vt_address == SYMBOL_VALUE_ADDRESS (msymbol))) |
| 192 | { |
| 193 | fputs_filtered (" <", stream); |
| 194 | fputs_filtered (SYMBOL_SOURCE_NAME (msymbol), stream); |
| 195 | fputs_filtered (">", stream); |
| 196 | } |
| 197 | if (vt_address && vtblprint) |
| 198 | { |
| 199 | value_ptr vt_val; |
| 200 | struct symbol *wsym = (struct symbol *) NULL; |
| 201 | struct type *wtype; |
| 202 | struct symtab *s; |
| 203 | struct block *block = (struct block *) NULL; |
| 204 | int is_this_fld; |
| 205 | |
| 206 | if (msymbol != NULL) |
| 207 | wsym = lookup_symbol (SYMBOL_NAME (msymbol), block, |
| 208 | VAR_NAMESPACE, &is_this_fld, &s); |
| 209 | |
| 210 | if (wsym) |
| 211 | { |
| 212 | wtype = SYMBOL_TYPE (wsym); |
| 213 | } |
| 214 | else |
| 215 | { |
| 216 | wtype = TYPE_TARGET_TYPE (type); |
| 217 | } |
| 218 | vt_val = value_at (wtype, vt_address, NULL); |
| 219 | val_print (VALUE_TYPE (vt_val), VALUE_CONTENTS (vt_val), 0, |
| 220 | VALUE_ADDRESS (vt_val), stream, format, |
| 221 | deref_ref, recurse + 1, pretty); |
| 222 | if (pretty) |
| 223 | { |
| 224 | fprintf_filtered (stream, "\n"); |
| 225 | print_spaces_filtered (2 + 2 * recurse, stream); |
| 226 | } |
| 227 | } |
| 228 | } |
| 229 | |
| 230 | /* Return number of characters printed, including the terminating |
| 231 | '\0' if we reached the end. val_print_string takes care including |
| 232 | the terminating '\0' if necessary. */ |
| 233 | return i; |
| 234 | } |
| 235 | break; |
| 236 | |
| 237 | case TYPE_CODE_MEMBER: |
| 238 | error ("not implemented: member type in c_val_print"); |
| 239 | break; |
| 240 | |
| 241 | case TYPE_CODE_REF: |
| 242 | elttype = check_typedef (TYPE_TARGET_TYPE (type)); |
| 243 | if (TYPE_CODE (elttype) == TYPE_CODE_MEMBER) |
| 244 | { |
| 245 | cp_print_class_member (valaddr + embedded_offset, |
| 246 | TYPE_DOMAIN_TYPE (elttype), |
| 247 | stream, ""); |
| 248 | break; |
| 249 | } |
| 250 | if (addressprint) |
| 251 | { |
| 252 | fprintf_filtered (stream, "@"); |
| 253 | print_address_numeric |
| 254 | (extract_address (valaddr + embedded_offset, |
| 255 | TARGET_PTR_BIT / HOST_CHAR_BIT), 1, stream); |
| 256 | if (deref_ref) |
| 257 | fputs_filtered (": ", stream); |
| 258 | } |
| 259 | /* De-reference the reference. */ |
| 260 | if (deref_ref) |
| 261 | { |
| 262 | if (TYPE_CODE (elttype) != TYPE_CODE_UNDEF) |
| 263 | { |
| 264 | value_ptr deref_val = |
| 265 | value_at |
| 266 | (TYPE_TARGET_TYPE (type), |
| 267 | unpack_pointer (lookup_pointer_type (builtin_type_void), |
| 268 | valaddr + embedded_offset), |
| 269 | NULL); |
| 270 | val_print (VALUE_TYPE (deref_val), |
| 271 | VALUE_CONTENTS (deref_val), |
| 272 | 0, |
| 273 | VALUE_ADDRESS (deref_val), |
| 274 | stream, |
| 275 | format, |
| 276 | deref_ref, |
| 277 | recurse, |
| 278 | pretty); |
| 279 | } |
| 280 | else |
| 281 | fputs_filtered ("???", stream); |
| 282 | } |
| 283 | break; |
| 284 | |
| 285 | case TYPE_CODE_UNION: |
| 286 | if (recurse && !unionprint) |
| 287 | { |
| 288 | fprintf_filtered (stream, "{...}"); |
| 289 | break; |
| 290 | } |
| 291 | /* Fall through. */ |
| 292 | case TYPE_CODE_STRUCT: |
| 293 | if (vtblprint && cp_is_vtbl_ptr_type (type)) |
| 294 | { |
| 295 | /* Print the unmangled name if desired. */ |
| 296 | /* Print vtable entry - we only get here if NOT using |
| 297 | -fvtable_thunks. (Otherwise, look under TYPE_CODE_PTR.) */ |
| 298 | print_address_demangle (extract_address ( |
| 299 | valaddr + embedded_offset + |
| 300 | TYPE_FIELD_BITPOS (type, VTBL_FNADDR_OFFSET) / 8, |
| 301 | TYPE_LENGTH (TYPE_FIELD_TYPE (type, VTBL_FNADDR_OFFSET))), |
| 302 | stream, demangle); |
| 303 | } |
| 304 | else |
| 305 | cp_print_value_fields (type, type, valaddr, embedded_offset, address, stream, format, |
| 306 | recurse, pretty, NULL, 0); |
| 307 | break; |
| 308 | |
| 309 | case TYPE_CODE_ENUM: |
| 310 | if (format) |
| 311 | { |
| 312 | print_scalar_formatted (valaddr + embedded_offset, type, format, 0, stream); |
| 313 | break; |
| 314 | } |
| 315 | len = TYPE_NFIELDS (type); |
| 316 | val = unpack_long (type, valaddr + embedded_offset); |
| 317 | for (i = 0; i < len; i++) |
| 318 | { |
| 319 | QUIT; |
| 320 | if (val == TYPE_FIELD_BITPOS (type, i)) |
| 321 | { |
| 322 | break; |
| 323 | } |
| 324 | } |
| 325 | if (i < len) |
| 326 | { |
| 327 | fputs_filtered (TYPE_FIELD_NAME (type, i), stream); |
| 328 | } |
| 329 | else |
| 330 | { |
| 331 | print_longest (stream, 'd', 0, val); |
| 332 | } |
| 333 | break; |
| 334 | |
| 335 | case TYPE_CODE_FUNC: |
| 336 | if (format) |
| 337 | { |
| 338 | print_scalar_formatted (valaddr + embedded_offset, type, format, 0, stream); |
| 339 | break; |
| 340 | } |
| 341 | /* FIXME, we should consider, at least for ANSI C language, eliminating |
| 342 | the distinction made between FUNCs and POINTERs to FUNCs. */ |
| 343 | fprintf_filtered (stream, "{"); |
| 344 | type_print (type, "", stream, -1); |
| 345 | fprintf_filtered (stream, "} "); |
| 346 | /* Try to print what function it points to, and its address. */ |
| 347 | print_address_demangle (address, stream, demangle); |
| 348 | break; |
| 349 | |
| 350 | case TYPE_CODE_BOOL: |
| 351 | format = format ? format : output_format; |
| 352 | if (format) |
| 353 | print_scalar_formatted (valaddr + embedded_offset, type, format, 0, stream); |
| 354 | else |
| 355 | { |
| 356 | val = unpack_long (type, valaddr + embedded_offset); |
| 357 | if (val == 0) |
| 358 | fputs_filtered ("false", stream); |
| 359 | else if (val == 1) |
| 360 | fputs_filtered ("true", stream); |
| 361 | else |
| 362 | print_longest (stream, 'd', 0, val); |
| 363 | } |
| 364 | break; |
| 365 | |
| 366 | case TYPE_CODE_RANGE: |
| 367 | /* FIXME: create_range_type does not set the unsigned bit in a |
| 368 | range type (I think it probably should copy it from the target |
| 369 | type), so we won't print values which are too large to |
| 370 | fit in a signed integer correctly. */ |
| 371 | /* FIXME: Doesn't handle ranges of enums correctly. (Can't just |
| 372 | print with the target type, though, because the size of our type |
| 373 | and the target type might differ). */ |
| 374 | /* FALLTHROUGH */ |
| 375 | |
| 376 | case TYPE_CODE_INT: |
| 377 | format = format ? format : output_format; |
| 378 | if (format) |
| 379 | { |
| 380 | print_scalar_formatted (valaddr + embedded_offset, type, format, 0, stream); |
| 381 | } |
| 382 | else |
| 383 | { |
| 384 | val_print_type_code_int (type, valaddr + embedded_offset, stream); |
| 385 | /* C and C++ has no single byte int type, char is used instead. |
| 386 | Since we don't know whether the value is really intended to |
| 387 | be used as an integer or a character, print the character |
| 388 | equivalent as well. */ |
| 389 | if (TYPE_LENGTH (type) == 1) |
| 390 | { |
| 391 | fputs_filtered (" ", stream); |
| 392 | LA_PRINT_CHAR ((unsigned char) unpack_long (type, valaddr + embedded_offset), |
| 393 | stream); |
| 394 | } |
| 395 | } |
| 396 | break; |
| 397 | |
| 398 | case TYPE_CODE_CHAR: |
| 399 | format = format ? format : output_format; |
| 400 | if (format) |
| 401 | { |
| 402 | print_scalar_formatted (valaddr + embedded_offset, type, format, 0, stream); |
| 403 | } |
| 404 | else |
| 405 | { |
| 406 | val = unpack_long (type, valaddr + embedded_offset); |
| 407 | if (TYPE_UNSIGNED (type)) |
| 408 | fprintf_filtered (stream, "%u", (unsigned int) val); |
| 409 | else |
| 410 | fprintf_filtered (stream, "%d", (int) val); |
| 411 | fputs_filtered (" ", stream); |
| 412 | LA_PRINT_CHAR ((unsigned char) val, stream); |
| 413 | } |
| 414 | break; |
| 415 | |
| 416 | case TYPE_CODE_FLT: |
| 417 | if (format) |
| 418 | { |
| 419 | print_scalar_formatted (valaddr + embedded_offset, type, format, 0, stream); |
| 420 | } |
| 421 | else |
| 422 | { |
| 423 | print_floating (valaddr + embedded_offset, type, stream); |
| 424 | } |
| 425 | break; |
| 426 | |
| 427 | case TYPE_CODE_METHOD: |
| 428 | cp_print_class_method (valaddr + embedded_offset, lookup_pointer_type (type), stream); |
| 429 | break; |
| 430 | |
| 431 | case TYPE_CODE_VOID: |
| 432 | fprintf_filtered (stream, "void"); |
| 433 | break; |
| 434 | |
| 435 | case TYPE_CODE_ERROR: |
| 436 | fprintf_filtered (stream, "<error type>"); |
| 437 | break; |
| 438 | |
| 439 | case TYPE_CODE_UNDEF: |
| 440 | /* This happens (without TYPE_FLAG_STUB set) on systems which don't use |
| 441 | dbx xrefs (NO_DBX_XREFS in gcc) if a file has a "struct foo *bar" |
| 442 | and no complete type for struct foo in that file. */ |
| 443 | fprintf_filtered (stream, "<incomplete type>"); |
| 444 | break; |
| 445 | |
| 446 | default: |
| 447 | error ("Invalid C/C++ type code %d in symbol table.", TYPE_CODE (type)); |
| 448 | } |
| 449 | gdb_flush (stream); |
| 450 | return (0); |
| 451 | } |
| 452 | \f |
| 453 | int |
| 454 | c_value_print (val, stream, format, pretty) |
| 455 | value_ptr val; |
| 456 | struct ui_file *stream; |
| 457 | int format; |
| 458 | enum val_prettyprint pretty; |
| 459 | { |
| 460 | struct type *type = VALUE_TYPE (val); |
| 461 | struct type *real_type; |
| 462 | int full, top, using_enc; |
| 463 | |
| 464 | /* If it is a pointer, indicate what it points to. |
| 465 | |
| 466 | Print type also if it is a reference. |
| 467 | |
| 468 | C++: if it is a member pointer, we will take care |
| 469 | of that when we print it. */ |
| 470 | if (TYPE_CODE (type) == TYPE_CODE_PTR || |
| 471 | TYPE_CODE (type) == TYPE_CODE_REF) |
| 472 | { |
| 473 | /* Hack: remove (char *) for char strings. Their |
| 474 | type is indicated by the quoted string anyway. */ |
| 475 | if (TYPE_CODE (type) == TYPE_CODE_PTR && |
| 476 | TYPE_NAME (type) == NULL && |
| 477 | TYPE_NAME (TYPE_TARGET_TYPE (type)) != NULL && |
| 478 | STREQ (TYPE_NAME (TYPE_TARGET_TYPE (type)), "char")) |
| 479 | { |
| 480 | /* Print nothing */ |
| 481 | } |
| 482 | else if (objectprint && (TYPE_CODE (TYPE_TARGET_TYPE (type)) == TYPE_CODE_CLASS)) |
| 483 | { |
| 484 | /* Pointer to class, check real type of object */ |
| 485 | fprintf_filtered (stream, "("); |
| 486 | real_type = value_rtti_target_type (val, &full, &top, &using_enc); |
| 487 | if (real_type) |
| 488 | { |
| 489 | /* RTTI entry found */ |
| 490 | if (TYPE_CODE (type) == TYPE_CODE_PTR) |
| 491 | { |
| 492 | /* create a pointer type pointing to the real type */ |
| 493 | type = lookup_pointer_type (real_type); |
| 494 | } |
| 495 | else |
| 496 | { |
| 497 | /* create a reference type referencing the real type */ |
| 498 | type = lookup_reference_type (real_type); |
| 499 | } |
| 500 | /* Note: When we look up RTTI entries, we don't get any |
| 501 | information on const or volatile attributes */ |
| 502 | } |
| 503 | type_print (type, "", stream, -1); |
| 504 | fprintf_filtered (stream, ") "); |
| 505 | } |
| 506 | else |
| 507 | { |
| 508 | /* normal case */ |
| 509 | fprintf_filtered (stream, "("); |
| 510 | type_print (type, "", stream, -1); |
| 511 | fprintf_filtered (stream, ") "); |
| 512 | } |
| 513 | } |
| 514 | if (objectprint && (TYPE_CODE (VALUE_TYPE (val)) == TYPE_CODE_CLASS)) |
| 515 | { |
| 516 | /* Attempt to determine real type of object */ |
| 517 | real_type = value_rtti_type (val, &full, &top, &using_enc); |
| 518 | if (real_type) |
| 519 | { |
| 520 | /* We have RTTI information, so use it */ |
| 521 | val = value_full_object (val, real_type, full, top, using_enc); |
| 522 | fprintf_filtered (stream, "(%s%s) ", |
| 523 | TYPE_NAME (real_type), |
| 524 | full ? "" : " [incomplete object]"); |
| 525 | /* Print out object: enclosing type is same as real_type if full */ |
| 526 | return val_print (VALUE_ENCLOSING_TYPE (val), VALUE_CONTENTS_ALL (val), 0, |
| 527 | VALUE_ADDRESS (val), stream, format, 1, 0, pretty); |
| 528 | /* Note: When we look up RTTI entries, we don't get any information on |
| 529 | const or volatile attributes */ |
| 530 | } |
| 531 | else if (type != VALUE_ENCLOSING_TYPE (val)) |
| 532 | { |
| 533 | /* No RTTI information, so let's do our best */ |
| 534 | fprintf_filtered (stream, "(%s ?) ", |
| 535 | TYPE_NAME (VALUE_ENCLOSING_TYPE (val))); |
| 536 | return val_print (VALUE_ENCLOSING_TYPE (val), VALUE_CONTENTS_ALL (val), 0, |
| 537 | VALUE_ADDRESS (val), stream, format, 1, 0, pretty); |
| 538 | } |
| 539 | /* Otherwise, we end up at the return outside this "if" */ |
| 540 | } |
| 541 | |
| 542 | return val_print (type, VALUE_CONTENTS_ALL (val), VALUE_EMBEDDED_OFFSET (val), |
| 543 | VALUE_ADDRESS (val), |
| 544 | stream, format, 1, 0, pretty); |
| 545 | } |