| 1 | /* Support for printing C++ values for GDB, the GNU debugger. |
| 2 | |
| 3 | Copyright (C) 1986, 1988, 1989, 1991, 1992, 1993, 1994, 1995, 1996, 1997, |
| 4 | 2000, 2001, 2002, 2003, 2005, 2006, 2007, 2008, 2009 |
| 5 | Free Software Foundation, Inc. |
| 6 | |
| 7 | This file is part of GDB. |
| 8 | |
| 9 | This program is free software; you can redistribute it and/or modify |
| 10 | it under the terms of the GNU General Public License as published by |
| 11 | the Free Software Foundation; either version 3 of the License, or |
| 12 | (at your option) any later version. |
| 13 | |
| 14 | This program is distributed in the hope that it will be useful, |
| 15 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 16 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 17 | GNU General Public License for more details. |
| 18 | |
| 19 | You should have received a copy of the GNU General Public License |
| 20 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
| 21 | |
| 22 | #include "defs.h" |
| 23 | #include "gdb_obstack.h" |
| 24 | #include "symtab.h" |
| 25 | #include "gdbtypes.h" |
| 26 | #include "expression.h" |
| 27 | #include "value.h" |
| 28 | #include "command.h" |
| 29 | #include "gdbcmd.h" |
| 30 | #include "demangle.h" |
| 31 | #include "annotate.h" |
| 32 | #include "gdb_string.h" |
| 33 | #include "c-lang.h" |
| 34 | #include "target.h" |
| 35 | #include "cp-abi.h" |
| 36 | #include "valprint.h" |
| 37 | #include "cp-support.h" |
| 38 | #include "language.h" |
| 39 | |
| 40 | /* Controls printing of vtbl's */ |
| 41 | static void |
| 42 | show_vtblprint (struct ui_file *file, int from_tty, |
| 43 | struct cmd_list_element *c, const char *value) |
| 44 | { |
| 45 | fprintf_filtered (file, _("\ |
| 46 | Printing of C++ virtual function tables is %s.\n"), |
| 47 | value); |
| 48 | } |
| 49 | |
| 50 | /* Controls looking up an object's derived type using what we find in |
| 51 | its vtables. */ |
| 52 | static void |
| 53 | show_objectprint (struct ui_file *file, int from_tty, |
| 54 | struct cmd_list_element *c, |
| 55 | const char *value) |
| 56 | { |
| 57 | fprintf_filtered (file, _("\ |
| 58 | Printing of object's derived type based on vtable info is %s.\n"), |
| 59 | value); |
| 60 | } |
| 61 | |
| 62 | static void |
| 63 | show_static_field_print (struct ui_file *file, int from_tty, |
| 64 | struct cmd_list_element *c, const char *value) |
| 65 | { |
| 66 | fprintf_filtered (file, _("Printing of C++ static members is %s.\n"), |
| 67 | value); |
| 68 | } |
| 69 | |
| 70 | |
| 71 | static struct obstack dont_print_vb_obstack; |
| 72 | static struct obstack dont_print_statmem_obstack; |
| 73 | |
| 74 | extern void _initialize_cp_valprint (void); |
| 75 | |
| 76 | static void cp_print_static_field (struct type *, struct value *, |
| 77 | struct ui_file *, int, |
| 78 | const struct value_print_options *); |
| 79 | |
| 80 | static void cp_print_value (struct type *, struct type *, const gdb_byte *, |
| 81 | int, CORE_ADDR, struct ui_file *, int, |
| 82 | const struct value_print_options *, struct type **); |
| 83 | |
| 84 | |
| 85 | /* GCC versions after 2.4.5 use this. */ |
| 86 | const char vtbl_ptr_name[] = "__vtbl_ptr_type"; |
| 87 | |
| 88 | /* Return truth value for assertion that TYPE is of the type |
| 89 | "pointer to virtual function". */ |
| 90 | |
| 91 | int |
| 92 | cp_is_vtbl_ptr_type (struct type *type) |
| 93 | { |
| 94 | char *typename = type_name_no_tag (type); |
| 95 | |
| 96 | return (typename != NULL && !strcmp (typename, vtbl_ptr_name)); |
| 97 | } |
| 98 | |
| 99 | /* Return truth value for the assertion that TYPE is of the type |
| 100 | "pointer to virtual function table". */ |
| 101 | |
| 102 | int |
| 103 | cp_is_vtbl_member (struct type *type) |
| 104 | { |
| 105 | /* With older versions of g++, the vtbl field pointed to an array |
| 106 | of structures. Nowadays it points directly to the structure. */ |
| 107 | if (TYPE_CODE (type) == TYPE_CODE_PTR) |
| 108 | { |
| 109 | type = TYPE_TARGET_TYPE (type); |
| 110 | if (TYPE_CODE (type) == TYPE_CODE_ARRAY) |
| 111 | { |
| 112 | type = TYPE_TARGET_TYPE (type); |
| 113 | if (TYPE_CODE (type) == TYPE_CODE_STRUCT /* if not using thunks */ |
| 114 | || TYPE_CODE (type) == TYPE_CODE_PTR) /* if using thunks */ |
| 115 | { |
| 116 | /* Virtual functions tables are full of pointers |
| 117 | to virtual functions. */ |
| 118 | return cp_is_vtbl_ptr_type (type); |
| 119 | } |
| 120 | } |
| 121 | else if (TYPE_CODE (type) == TYPE_CODE_STRUCT) /* if not using thunks */ |
| 122 | { |
| 123 | return cp_is_vtbl_ptr_type (type); |
| 124 | } |
| 125 | else if (TYPE_CODE (type) == TYPE_CODE_PTR) /* if using thunks */ |
| 126 | { |
| 127 | /* The type name of the thunk pointer is NULL when using dwarf2. |
| 128 | We could test for a pointer to a function, but there is |
| 129 | no type info for the virtual table either, so it wont help. */ |
| 130 | return cp_is_vtbl_ptr_type (type); |
| 131 | } |
| 132 | } |
| 133 | return 0; |
| 134 | } |
| 135 | |
| 136 | /* Mutually recursive subroutines of cp_print_value and c_val_print to |
| 137 | print out a structure's fields: cp_print_value_fields and cp_print_value. |
| 138 | |
| 139 | TYPE, VALADDR, ADDRESS, STREAM, RECURSE, and OPTIONS have the |
| 140 | same meanings as in cp_print_value and c_val_print. |
| 141 | |
| 142 | 2nd argument REAL_TYPE is used to carry over the type of the derived |
| 143 | class across the recursion to base classes. |
| 144 | |
| 145 | DONT_PRINT is an array of baseclass types that we |
| 146 | should not print, or zero if called from top level. */ |
| 147 | |
| 148 | void |
| 149 | cp_print_value_fields (struct type *type, struct type *real_type, |
| 150 | const gdb_byte *valaddr, int offset, CORE_ADDR address, |
| 151 | struct ui_file *stream, int recurse, |
| 152 | const struct value_print_options *options, |
| 153 | struct type **dont_print_vb, int dont_print_statmem) |
| 154 | { |
| 155 | int i, len, n_baseclasses; |
| 156 | char *last_dont_print = obstack_next_free (&dont_print_statmem_obstack); |
| 157 | int fields_seen = 0; |
| 158 | |
| 159 | CHECK_TYPEDEF (type); |
| 160 | |
| 161 | fprintf_filtered (stream, "{"); |
| 162 | len = TYPE_NFIELDS (type); |
| 163 | n_baseclasses = TYPE_N_BASECLASSES (type); |
| 164 | |
| 165 | /* First, print out baseclasses such that we don't print |
| 166 | duplicates of virtual baseclasses. */ |
| 167 | |
| 168 | if (n_baseclasses > 0) |
| 169 | cp_print_value (type, real_type, valaddr, offset, address, stream, |
| 170 | recurse + 1, options, dont_print_vb); |
| 171 | |
| 172 | /* Second, print out data fields */ |
| 173 | |
| 174 | /* If there are no data fields, skip this part */ |
| 175 | if (len == n_baseclasses || !len) |
| 176 | fprintf_filtered (stream, "<No data fields>"); |
| 177 | else |
| 178 | { |
| 179 | struct obstack tmp_obstack = dont_print_statmem_obstack; |
| 180 | |
| 181 | if (dont_print_statmem == 0) |
| 182 | { |
| 183 | /* If we're at top level, carve out a completely fresh |
| 184 | chunk of the obstack and use that until this particular |
| 185 | invocation returns. */ |
| 186 | obstack_finish (&dont_print_statmem_obstack); |
| 187 | } |
| 188 | |
| 189 | for (i = n_baseclasses; i < len; i++) |
| 190 | { |
| 191 | /* If requested, skip printing of static fields. */ |
| 192 | if (!options->static_field_print |
| 193 | && field_is_static (&TYPE_FIELD (type, i))) |
| 194 | continue; |
| 195 | |
| 196 | if (fields_seen) |
| 197 | fprintf_filtered (stream, ", "); |
| 198 | else if (n_baseclasses > 0) |
| 199 | { |
| 200 | if (options->pretty) |
| 201 | { |
| 202 | fprintf_filtered (stream, "\n"); |
| 203 | print_spaces_filtered (2 + 2 * recurse, stream); |
| 204 | fputs_filtered ("members of ", stream); |
| 205 | fputs_filtered (type_name_no_tag (type), stream); |
| 206 | fputs_filtered (": ", stream); |
| 207 | } |
| 208 | } |
| 209 | fields_seen = 1; |
| 210 | |
| 211 | if (options->pretty) |
| 212 | { |
| 213 | fprintf_filtered (stream, "\n"); |
| 214 | print_spaces_filtered (2 + 2 * recurse, stream); |
| 215 | } |
| 216 | else |
| 217 | { |
| 218 | wrap_here (n_spaces (2 + 2 * recurse)); |
| 219 | } |
| 220 | if (options->inspect_it) |
| 221 | { |
| 222 | if (TYPE_CODE (TYPE_FIELD_TYPE (type, i)) == TYPE_CODE_PTR) |
| 223 | fputs_filtered ("\"( ptr \"", stream); |
| 224 | else |
| 225 | fputs_filtered ("\"( nodef \"", stream); |
| 226 | if (field_is_static (&TYPE_FIELD (type, i))) |
| 227 | fputs_filtered ("static ", stream); |
| 228 | fprintf_symbol_filtered (stream, TYPE_FIELD_NAME (type, i), |
| 229 | current_language->la_language, |
| 230 | DMGL_PARAMS | DMGL_ANSI); |
| 231 | fputs_filtered ("\" \"", stream); |
| 232 | fprintf_symbol_filtered (stream, TYPE_FIELD_NAME (type, i), |
| 233 | current_language->la_language, |
| 234 | DMGL_PARAMS | DMGL_ANSI); |
| 235 | fputs_filtered ("\") \"", stream); |
| 236 | } |
| 237 | else |
| 238 | { |
| 239 | annotate_field_begin (TYPE_FIELD_TYPE (type, i)); |
| 240 | |
| 241 | if (field_is_static (&TYPE_FIELD (type, i))) |
| 242 | fputs_filtered ("static ", stream); |
| 243 | fprintf_symbol_filtered (stream, TYPE_FIELD_NAME (type, i), |
| 244 | current_language->la_language, |
| 245 | DMGL_PARAMS | DMGL_ANSI); |
| 246 | annotate_field_name_end (); |
| 247 | /* do not print leading '=' in case of anonymous unions */ |
| 248 | if (strcmp (TYPE_FIELD_NAME (type, i), "")) |
| 249 | fputs_filtered (" = ", stream); |
| 250 | annotate_field_value (); |
| 251 | } |
| 252 | |
| 253 | if (!field_is_static (&TYPE_FIELD (type, i)) |
| 254 | && TYPE_FIELD_PACKED (type, i)) |
| 255 | { |
| 256 | struct value *v; |
| 257 | |
| 258 | /* Bitfields require special handling, especially due to byte |
| 259 | order problems. */ |
| 260 | if (TYPE_FIELD_IGNORE (type, i)) |
| 261 | { |
| 262 | fputs_filtered ("<optimized out or zero length>", stream); |
| 263 | } |
| 264 | else |
| 265 | { |
| 266 | struct value_print_options opts = *options; |
| 267 | opts.deref_ref = 0; |
| 268 | v = value_from_longest |
| 269 | (TYPE_FIELD_TYPE (type, i), |
| 270 | unpack_field_as_long (type, valaddr + offset, i)); |
| 271 | |
| 272 | common_val_print (v, stream, recurse + 1, &opts, |
| 273 | current_language); |
| 274 | } |
| 275 | } |
| 276 | else |
| 277 | { |
| 278 | if (TYPE_FIELD_IGNORE (type, i)) |
| 279 | { |
| 280 | fputs_filtered ("<optimized out or zero length>", stream); |
| 281 | } |
| 282 | else if (field_is_static (&TYPE_FIELD (type, i))) |
| 283 | { |
| 284 | struct value *v = value_static_field (type, i); |
| 285 | if (v == NULL) |
| 286 | fputs_filtered ("<optimized out>", stream); |
| 287 | else |
| 288 | cp_print_static_field (TYPE_FIELD_TYPE (type, i), v, |
| 289 | stream, recurse + 1, options); |
| 290 | } |
| 291 | else |
| 292 | { |
| 293 | struct value_print_options opts = *options; |
| 294 | opts.deref_ref = 0; |
| 295 | val_print (TYPE_FIELD_TYPE (type, i), |
| 296 | valaddr, offset + TYPE_FIELD_BITPOS (type, i) / 8, |
| 297 | address + TYPE_FIELD_BITPOS (type, i) / 8, |
| 298 | stream, recurse + 1, &opts, |
| 299 | current_language); |
| 300 | } |
| 301 | } |
| 302 | annotate_field_end (); |
| 303 | } |
| 304 | |
| 305 | if (dont_print_statmem == 0) |
| 306 | { |
| 307 | /* Free the space used to deal with the printing |
| 308 | of the members from top level. */ |
| 309 | obstack_free (&dont_print_statmem_obstack, last_dont_print); |
| 310 | dont_print_statmem_obstack = tmp_obstack; |
| 311 | } |
| 312 | |
| 313 | if (options->pretty) |
| 314 | { |
| 315 | fprintf_filtered (stream, "\n"); |
| 316 | print_spaces_filtered (2 * recurse, stream); |
| 317 | } |
| 318 | } /* if there are data fields */ |
| 319 | |
| 320 | fprintf_filtered (stream, "}"); |
| 321 | } |
| 322 | |
| 323 | /* Special val_print routine to avoid printing multiple copies of virtual |
| 324 | baseclasses. */ |
| 325 | |
| 326 | static void |
| 327 | cp_print_value (struct type *type, struct type *real_type, |
| 328 | const gdb_byte *valaddr, int offset, CORE_ADDR address, |
| 329 | struct ui_file *stream, int recurse, |
| 330 | const struct value_print_options *options, |
| 331 | struct type **dont_print_vb) |
| 332 | { |
| 333 | struct type **last_dont_print |
| 334 | = (struct type **) obstack_next_free (&dont_print_vb_obstack); |
| 335 | struct obstack tmp_obstack = dont_print_vb_obstack; |
| 336 | int i, n_baseclasses = TYPE_N_BASECLASSES (type); |
| 337 | int thisoffset; |
| 338 | struct type *thistype; |
| 339 | |
| 340 | if (dont_print_vb == 0) |
| 341 | { |
| 342 | /* If we're at top level, carve out a completely fresh |
| 343 | chunk of the obstack and use that until this particular |
| 344 | invocation returns. */ |
| 345 | /* Bump up the high-water mark. Now alpha is omega. */ |
| 346 | obstack_finish (&dont_print_vb_obstack); |
| 347 | } |
| 348 | |
| 349 | for (i = 0; i < n_baseclasses; i++) |
| 350 | { |
| 351 | int boffset; |
| 352 | int skip; |
| 353 | struct type *baseclass = check_typedef (TYPE_BASECLASS (type, i)); |
| 354 | char *basename = TYPE_NAME (baseclass); |
| 355 | const gdb_byte *base_valaddr; |
| 356 | |
| 357 | if (BASETYPE_VIA_VIRTUAL (type, i)) |
| 358 | { |
| 359 | struct type **first_dont_print |
| 360 | = (struct type **) obstack_base (&dont_print_vb_obstack); |
| 361 | |
| 362 | int j = (struct type **) obstack_next_free (&dont_print_vb_obstack) |
| 363 | - first_dont_print; |
| 364 | |
| 365 | while (--j >= 0) |
| 366 | if (baseclass == first_dont_print[j]) |
| 367 | goto flush_it; |
| 368 | |
| 369 | obstack_ptr_grow (&dont_print_vb_obstack, baseclass); |
| 370 | } |
| 371 | |
| 372 | thisoffset = offset; |
| 373 | thistype = real_type; |
| 374 | |
| 375 | boffset = baseclass_offset (type, i, valaddr + offset, address); |
| 376 | skip = ((boffset == -1) || (boffset + offset) < 0) ? 1 : -1; |
| 377 | |
| 378 | if (BASETYPE_VIA_VIRTUAL (type, i)) |
| 379 | { |
| 380 | /* The virtual base class pointer might have been |
| 381 | clobbered by the user program. Make sure that it |
| 382 | still points to a valid memory location. */ |
| 383 | |
| 384 | if (boffset != -1 |
| 385 | && ((boffset + offset) < 0 |
| 386 | || (boffset + offset) >= TYPE_LENGTH (type))) |
| 387 | { |
| 388 | /* FIXME (alloca): unsafe if baseclass is really really large. */ |
| 389 | gdb_byte *buf = alloca (TYPE_LENGTH (baseclass)); |
| 390 | base_valaddr = buf; |
| 391 | if (target_read_memory (address + boffset, buf, |
| 392 | TYPE_LENGTH (baseclass)) != 0) |
| 393 | skip = 1; |
| 394 | address = address + boffset; |
| 395 | thisoffset = 0; |
| 396 | boffset = 0; |
| 397 | thistype = baseclass; |
| 398 | } |
| 399 | else |
| 400 | base_valaddr = valaddr; |
| 401 | } |
| 402 | else |
| 403 | base_valaddr = valaddr; |
| 404 | |
| 405 | /* now do the printing */ |
| 406 | if (options->pretty) |
| 407 | { |
| 408 | fprintf_filtered (stream, "\n"); |
| 409 | print_spaces_filtered (2 * recurse, stream); |
| 410 | } |
| 411 | fputs_filtered ("<", stream); |
| 412 | /* Not sure what the best notation is in the case where there is no |
| 413 | baseclass name. */ |
| 414 | fputs_filtered (basename ? basename : "", stream); |
| 415 | fputs_filtered ("> = ", stream); |
| 416 | |
| 417 | |
| 418 | if (skip >= 1) |
| 419 | fprintf_filtered (stream, "<invalid address>"); |
| 420 | else |
| 421 | cp_print_value_fields (baseclass, thistype, base_valaddr, |
| 422 | thisoffset + boffset, address + boffset, |
| 423 | stream, recurse, options, |
| 424 | ((struct type **) |
| 425 | obstack_base (&dont_print_vb_obstack)), |
| 426 | 0); |
| 427 | fputs_filtered (", ", stream); |
| 428 | |
| 429 | flush_it: |
| 430 | ; |
| 431 | } |
| 432 | |
| 433 | if (dont_print_vb == 0) |
| 434 | { |
| 435 | /* Free the space used to deal with the printing |
| 436 | of this type from top level. */ |
| 437 | obstack_free (&dont_print_vb_obstack, last_dont_print); |
| 438 | /* Reset watermark so that we can continue protecting |
| 439 | ourselves from whatever we were protecting ourselves. */ |
| 440 | dont_print_vb_obstack = tmp_obstack; |
| 441 | } |
| 442 | } |
| 443 | |
| 444 | /* Print value of a static member. |
| 445 | To avoid infinite recursion when printing a class that contains |
| 446 | a static instance of the class, we keep the addresses of all printed |
| 447 | static member classes in an obstack and refuse to print them more |
| 448 | than once. |
| 449 | |
| 450 | VAL contains the value to print, TYPE, STREAM, RECURSE, and OPTIONS |
| 451 | have the same meanings as in c_val_print. */ |
| 452 | |
| 453 | static void |
| 454 | cp_print_static_field (struct type *type, |
| 455 | struct value *val, |
| 456 | struct ui_file *stream, |
| 457 | int recurse, |
| 458 | const struct value_print_options *options) |
| 459 | { |
| 460 | struct value_print_options opts; |
| 461 | if (TYPE_CODE (type) == TYPE_CODE_STRUCT) |
| 462 | { |
| 463 | CORE_ADDR *first_dont_print; |
| 464 | int i; |
| 465 | |
| 466 | first_dont_print |
| 467 | = (CORE_ADDR *) obstack_base (&dont_print_statmem_obstack); |
| 468 | i = (CORE_ADDR *) obstack_next_free (&dont_print_statmem_obstack) |
| 469 | - first_dont_print; |
| 470 | |
| 471 | while (--i >= 0) |
| 472 | { |
| 473 | if (VALUE_ADDRESS (val) == first_dont_print[i]) |
| 474 | { |
| 475 | fputs_filtered ("<same as static member of an already" |
| 476 | " seen type>", |
| 477 | stream); |
| 478 | return; |
| 479 | } |
| 480 | } |
| 481 | |
| 482 | obstack_grow (&dont_print_statmem_obstack, (char *) &VALUE_ADDRESS (val), |
| 483 | sizeof (CORE_ADDR)); |
| 484 | |
| 485 | CHECK_TYPEDEF (type); |
| 486 | cp_print_value_fields (type, type, value_contents_all (val), |
| 487 | value_embedded_offset (val), VALUE_ADDRESS (val), |
| 488 | stream, recurse, options, NULL, 1); |
| 489 | return; |
| 490 | } |
| 491 | |
| 492 | opts = *options; |
| 493 | opts.deref_ref = 0; |
| 494 | val_print (type, value_contents_all (val), |
| 495 | value_embedded_offset (val), VALUE_ADDRESS (val), |
| 496 | stream, recurse, &opts, current_language); |
| 497 | } |
| 498 | |
| 499 | |
| 500 | /* Find the field in *DOMAIN, or its non-virtual base classes, with bit offset |
| 501 | OFFSET. Set *DOMAIN to the containing type and *FIELDNO to the containing |
| 502 | field number. If OFFSET is not exactly at the start of some field, set |
| 503 | *DOMAIN to NULL. */ |
| 504 | |
| 505 | static void |
| 506 | cp_find_class_member (struct type **domain_p, int *fieldno, |
| 507 | LONGEST offset) |
| 508 | { |
| 509 | struct type *domain; |
| 510 | unsigned int i; |
| 511 | unsigned len; |
| 512 | |
| 513 | *domain_p = check_typedef (*domain_p); |
| 514 | domain = *domain_p; |
| 515 | len = TYPE_NFIELDS (domain); |
| 516 | |
| 517 | for (i = TYPE_N_BASECLASSES (domain); i < len; i++) |
| 518 | { |
| 519 | LONGEST bitpos = TYPE_FIELD_BITPOS (domain, i); |
| 520 | |
| 521 | QUIT; |
| 522 | if (offset == bitpos) |
| 523 | { |
| 524 | *fieldno = i; |
| 525 | return; |
| 526 | } |
| 527 | } |
| 528 | |
| 529 | for (i = 0; i < TYPE_N_BASECLASSES (domain); i++) |
| 530 | { |
| 531 | LONGEST bitpos = TYPE_FIELD_BITPOS (domain, i); |
| 532 | LONGEST bitsize = 8 * TYPE_LENGTH (TYPE_FIELD_TYPE (domain, i)); |
| 533 | |
| 534 | if (offset >= bitpos && offset < bitpos + bitsize) |
| 535 | { |
| 536 | *domain_p = TYPE_FIELD_TYPE (domain, i); |
| 537 | cp_find_class_member (domain_p, fieldno, offset - bitpos); |
| 538 | return; |
| 539 | } |
| 540 | } |
| 541 | |
| 542 | *domain_p = NULL; |
| 543 | } |
| 544 | |
| 545 | void |
| 546 | cp_print_class_member (const gdb_byte *valaddr, struct type *type, |
| 547 | struct ui_file *stream, char *prefix) |
| 548 | { |
| 549 | /* VAL is a byte offset into the structure type DOMAIN. |
| 550 | Find the name of the field for that offset and |
| 551 | print it. */ |
| 552 | struct type *domain = TYPE_DOMAIN_TYPE (type); |
| 553 | LONGEST val = extract_signed_integer (valaddr, TYPE_LENGTH (type)); |
| 554 | unsigned int fieldno; |
| 555 | |
| 556 | /* Pointers to data members are usually byte offsets into an object. |
| 557 | Because a data member can have offset zero, and a NULL pointer to |
| 558 | member must be distinct from any valid non-NULL pointer to |
| 559 | member, either the value is biased or the NULL value has a |
| 560 | special representation; both are permitted by ISO C++. HP aCC |
| 561 | used a bias of 0x20000000; HP cfront used a bias of 1; g++ 3.x |
| 562 | and other compilers which use the Itanium ABI use -1 as the NULL |
| 563 | value. GDB only supports that last form; to add support for |
| 564 | another form, make this into a cp-abi hook. */ |
| 565 | |
| 566 | if (val == -1) |
| 567 | { |
| 568 | fprintf_filtered (stream, "NULL"); |
| 569 | return; |
| 570 | } |
| 571 | |
| 572 | cp_find_class_member (&domain, &fieldno, val << 3); |
| 573 | |
| 574 | if (domain != NULL) |
| 575 | { |
| 576 | char *name; |
| 577 | fputs_filtered (prefix, stream); |
| 578 | name = type_name_no_tag (domain); |
| 579 | if (name) |
| 580 | fputs_filtered (name, stream); |
| 581 | else |
| 582 | c_type_print_base (domain, stream, 0, 0); |
| 583 | fprintf_filtered (stream, "::"); |
| 584 | fputs_filtered (TYPE_FIELD_NAME (domain, fieldno), stream); |
| 585 | } |
| 586 | else |
| 587 | fprintf_filtered (stream, "%ld", (long) val); |
| 588 | } |
| 589 | |
| 590 | |
| 591 | void |
| 592 | _initialize_cp_valprint (void) |
| 593 | { |
| 594 | add_setshow_boolean_cmd ("static-members", class_support, |
| 595 | &user_print_options.static_field_print, _("\ |
| 596 | Set printing of C++ static members."), _("\ |
| 597 | Show printing of C++ static members."), NULL, |
| 598 | NULL, |
| 599 | show_static_field_print, |
| 600 | &setprintlist, &showprintlist); |
| 601 | |
| 602 | add_setshow_boolean_cmd ("vtbl", class_support, |
| 603 | &user_print_options.vtblprint, _("\ |
| 604 | Set printing of C++ virtual function tables."), _("\ |
| 605 | Show printing of C++ virtual function tables."), NULL, |
| 606 | NULL, |
| 607 | show_vtblprint, |
| 608 | &setprintlist, &showprintlist); |
| 609 | |
| 610 | add_setshow_boolean_cmd ("object", class_support, |
| 611 | &user_print_options.objectprint, _("\ |
| 612 | Set printing of object's derived type based on vtable info."), _("\ |
| 613 | Show printing of object's derived type based on vtable info."), NULL, |
| 614 | NULL, |
| 615 | show_objectprint, |
| 616 | &setprintlist, &showprintlist); |
| 617 | |
| 618 | obstack_begin (&dont_print_vb_obstack, 32 * sizeof (struct type *)); |
| 619 | obstack_specify_allocation (&dont_print_statmem_obstack, |
| 620 | 32 * sizeof (CORE_ADDR), sizeof (CORE_ADDR), |
| 621 | xmalloc, xfree); |
| 622 | } |