| 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 | #include "python/python.h" |
| 40 | |
| 41 | /* Controls printing of vtbl's */ |
| 42 | static void |
| 43 | show_vtblprint (struct ui_file *file, int from_tty, |
| 44 | struct cmd_list_element *c, const char *value) |
| 45 | { |
| 46 | fprintf_filtered (file, _("\ |
| 47 | Printing of C++ virtual function tables is %s.\n"), |
| 48 | value); |
| 49 | } |
| 50 | |
| 51 | /* Controls looking up an object's derived type using what we find in |
| 52 | its vtables. */ |
| 53 | static void |
| 54 | show_objectprint (struct ui_file *file, int from_tty, |
| 55 | struct cmd_list_element *c, |
| 56 | const char *value) |
| 57 | { |
| 58 | fprintf_filtered (file, _("\ |
| 59 | Printing of object's derived type based on vtable info is %s.\n"), |
| 60 | value); |
| 61 | } |
| 62 | |
| 63 | static void |
| 64 | show_static_field_print (struct ui_file *file, int from_tty, |
| 65 | struct cmd_list_element *c, const char *value) |
| 66 | { |
| 67 | fprintf_filtered (file, _("Printing of C++ static members is %s.\n"), |
| 68 | value); |
| 69 | } |
| 70 | |
| 71 | |
| 72 | static struct obstack dont_print_vb_obstack; |
| 73 | static struct obstack dont_print_statmem_obstack; |
| 74 | |
| 75 | extern void _initialize_cp_valprint (void); |
| 76 | |
| 77 | static void cp_print_static_field (struct type *, struct value *, |
| 78 | struct ui_file *, int, |
| 79 | const struct value_print_options *); |
| 80 | |
| 81 | static void cp_print_value (struct type *, struct type *, const gdb_byte *, |
| 82 | int, CORE_ADDR, struct ui_file *, int, |
| 83 | const struct value_print_options *, struct type **); |
| 84 | |
| 85 | |
| 86 | /* GCC versions after 2.4.5 use this. */ |
| 87 | const char vtbl_ptr_name[] = "__vtbl_ptr_type"; |
| 88 | |
| 89 | /* Return truth value for assertion that TYPE is of the type |
| 90 | "pointer to virtual function". */ |
| 91 | |
| 92 | int |
| 93 | cp_is_vtbl_ptr_type (struct type *type) |
| 94 | { |
| 95 | char *typename = type_name_no_tag (type); |
| 96 | |
| 97 | return (typename != NULL && !strcmp (typename, vtbl_ptr_name)); |
| 98 | } |
| 99 | |
| 100 | /* Return truth value for the assertion that TYPE is of the type |
| 101 | "pointer to virtual function table". */ |
| 102 | |
| 103 | int |
| 104 | cp_is_vtbl_member (struct type *type) |
| 105 | { |
| 106 | /* With older versions of g++, the vtbl field pointed to an array |
| 107 | of structures. Nowadays it points directly to the structure. */ |
| 108 | if (TYPE_CODE (type) == TYPE_CODE_PTR) |
| 109 | { |
| 110 | type = TYPE_TARGET_TYPE (type); |
| 111 | if (TYPE_CODE (type) == TYPE_CODE_ARRAY) |
| 112 | { |
| 113 | type = TYPE_TARGET_TYPE (type); |
| 114 | if (TYPE_CODE (type) == TYPE_CODE_STRUCT /* if not using thunks */ |
| 115 | || TYPE_CODE (type) == TYPE_CODE_PTR) /* if using thunks */ |
| 116 | { |
| 117 | /* Virtual functions tables are full of pointers |
| 118 | to virtual functions. */ |
| 119 | return cp_is_vtbl_ptr_type (type); |
| 120 | } |
| 121 | } |
| 122 | else if (TYPE_CODE (type) == TYPE_CODE_STRUCT) /* if not using thunks */ |
| 123 | { |
| 124 | return cp_is_vtbl_ptr_type (type); |
| 125 | } |
| 126 | else if (TYPE_CODE (type) == TYPE_CODE_PTR) /* if using thunks */ |
| 127 | { |
| 128 | /* The type name of the thunk pointer is NULL when using dwarf2. |
| 129 | We could test for a pointer to a function, but there is |
| 130 | no type info for the virtual table either, so it wont help. */ |
| 131 | return cp_is_vtbl_ptr_type (type); |
| 132 | } |
| 133 | } |
| 134 | return 0; |
| 135 | } |
| 136 | |
| 137 | /* Mutually recursive subroutines of cp_print_value and c_val_print to |
| 138 | print out a structure's fields: cp_print_value_fields and cp_print_value. |
| 139 | |
| 140 | TYPE, VALADDR, ADDRESS, STREAM, RECURSE, and OPTIONS have the |
| 141 | same meanings as in cp_print_value and c_val_print. |
| 142 | |
| 143 | 2nd argument REAL_TYPE is used to carry over the type of the derived |
| 144 | class across the recursion to base classes. |
| 145 | |
| 146 | DONT_PRINT is an array of baseclass types that we |
| 147 | should not print, or zero if called from top level. */ |
| 148 | |
| 149 | void |
| 150 | cp_print_value_fields (struct type *type, struct type *real_type, |
| 151 | const gdb_byte *valaddr, int offset, CORE_ADDR address, |
| 152 | struct ui_file *stream, int recurse, |
| 153 | const struct value_print_options *options, |
| 154 | struct type **dont_print_vb, int dont_print_statmem) |
| 155 | { |
| 156 | int i, len, n_baseclasses; |
| 157 | char *last_dont_print = obstack_next_free (&dont_print_statmem_obstack); |
| 158 | int fields_seen = 0; |
| 159 | |
| 160 | CHECK_TYPEDEF (type); |
| 161 | |
| 162 | fprintf_filtered (stream, "{"); |
| 163 | len = TYPE_NFIELDS (type); |
| 164 | n_baseclasses = TYPE_N_BASECLASSES (type); |
| 165 | |
| 166 | /* First, print out baseclasses such that we don't print |
| 167 | duplicates of virtual baseclasses. */ |
| 168 | |
| 169 | if (n_baseclasses > 0) |
| 170 | cp_print_value (type, real_type, valaddr, offset, address, stream, |
| 171 | recurse + 1, options, dont_print_vb); |
| 172 | |
| 173 | /* Second, print out data fields */ |
| 174 | |
| 175 | /* If there are no data fields, skip this part */ |
| 176 | if (len == n_baseclasses || !len) |
| 177 | fprintf_filtered (stream, "<No data fields>"); |
| 178 | else |
| 179 | { |
| 180 | struct obstack tmp_obstack = dont_print_statmem_obstack; |
| 181 | |
| 182 | if (dont_print_statmem == 0) |
| 183 | { |
| 184 | /* If we're at top level, carve out a completely fresh |
| 185 | chunk of the obstack and use that until this particular |
| 186 | invocation returns. */ |
| 187 | obstack_finish (&dont_print_statmem_obstack); |
| 188 | } |
| 189 | |
| 190 | for (i = n_baseclasses; i < len; i++) |
| 191 | { |
| 192 | /* If requested, skip printing of static fields. */ |
| 193 | if (!options->static_field_print |
| 194 | && field_is_static (&TYPE_FIELD (type, i))) |
| 195 | continue; |
| 196 | |
| 197 | if (fields_seen) |
| 198 | fprintf_filtered (stream, ", "); |
| 199 | else if (n_baseclasses > 0) |
| 200 | { |
| 201 | if (options->pretty) |
| 202 | { |
| 203 | fprintf_filtered (stream, "\n"); |
| 204 | print_spaces_filtered (2 + 2 * recurse, stream); |
| 205 | fputs_filtered ("members of ", stream); |
| 206 | fputs_filtered (type_name_no_tag (type), stream); |
| 207 | fputs_filtered (": ", stream); |
| 208 | } |
| 209 | } |
| 210 | fields_seen = 1; |
| 211 | |
| 212 | if (options->pretty) |
| 213 | { |
| 214 | fprintf_filtered (stream, "\n"); |
| 215 | print_spaces_filtered (2 + 2 * recurse, stream); |
| 216 | } |
| 217 | else |
| 218 | { |
| 219 | wrap_here (n_spaces (2 + 2 * recurse)); |
| 220 | } |
| 221 | if (options->inspect_it) |
| 222 | { |
| 223 | if (TYPE_CODE (TYPE_FIELD_TYPE (type, i)) == TYPE_CODE_PTR) |
| 224 | fputs_filtered ("\"( ptr \"", stream); |
| 225 | else |
| 226 | fputs_filtered ("\"( nodef \"", stream); |
| 227 | if (field_is_static (&TYPE_FIELD (type, i))) |
| 228 | fputs_filtered ("static ", stream); |
| 229 | fprintf_symbol_filtered (stream, TYPE_FIELD_NAME (type, i), |
| 230 | current_language->la_language, |
| 231 | DMGL_PARAMS | DMGL_ANSI); |
| 232 | fputs_filtered ("\" \"", stream); |
| 233 | fprintf_symbol_filtered (stream, TYPE_FIELD_NAME (type, i), |
| 234 | current_language->la_language, |
| 235 | DMGL_PARAMS | DMGL_ANSI); |
| 236 | fputs_filtered ("\") \"", stream); |
| 237 | } |
| 238 | else |
| 239 | { |
| 240 | annotate_field_begin (TYPE_FIELD_TYPE (type, i)); |
| 241 | |
| 242 | if (field_is_static (&TYPE_FIELD (type, i))) |
| 243 | fputs_filtered ("static ", stream); |
| 244 | fprintf_symbol_filtered (stream, TYPE_FIELD_NAME (type, i), |
| 245 | current_language->la_language, |
| 246 | DMGL_PARAMS | DMGL_ANSI); |
| 247 | annotate_field_name_end (); |
| 248 | /* do not print leading '=' in case of anonymous unions */ |
| 249 | if (strcmp (TYPE_FIELD_NAME (type, i), "")) |
| 250 | fputs_filtered (" = ", stream); |
| 251 | annotate_field_value (); |
| 252 | } |
| 253 | |
| 254 | if (!field_is_static (&TYPE_FIELD (type, i)) |
| 255 | && TYPE_FIELD_PACKED (type, i)) |
| 256 | { |
| 257 | struct value *v; |
| 258 | |
| 259 | /* Bitfields require special handling, especially due to byte |
| 260 | order problems. */ |
| 261 | if (TYPE_FIELD_IGNORE (type, i)) |
| 262 | { |
| 263 | fputs_filtered ("<optimized out or zero length>", stream); |
| 264 | } |
| 265 | else |
| 266 | { |
| 267 | struct value_print_options opts = *options; |
| 268 | opts.deref_ref = 0; |
| 269 | v = value_from_longest |
| 270 | (TYPE_FIELD_TYPE (type, i), |
| 271 | unpack_field_as_long (type, valaddr + offset, i)); |
| 272 | |
| 273 | common_val_print (v, stream, recurse + 1, &opts, |
| 274 | current_language); |
| 275 | } |
| 276 | } |
| 277 | else |
| 278 | { |
| 279 | if (TYPE_FIELD_IGNORE (type, i)) |
| 280 | { |
| 281 | fputs_filtered ("<optimized out or zero length>", stream); |
| 282 | } |
| 283 | else if (field_is_static (&TYPE_FIELD (type, i))) |
| 284 | { |
| 285 | struct value *v = value_static_field (type, i); |
| 286 | if (v == NULL) |
| 287 | fputs_filtered ("<optimized out>", stream); |
| 288 | else |
| 289 | cp_print_static_field (TYPE_FIELD_TYPE (type, i), v, |
| 290 | stream, recurse + 1, options); |
| 291 | } |
| 292 | else |
| 293 | { |
| 294 | struct value_print_options opts = *options; |
| 295 | opts.deref_ref = 0; |
| 296 | val_print (TYPE_FIELD_TYPE (type, i), |
| 297 | valaddr, offset + TYPE_FIELD_BITPOS (type, i) / 8, |
| 298 | address + TYPE_FIELD_BITPOS (type, i) / 8, |
| 299 | stream, recurse + 1, &opts, |
| 300 | current_language); |
| 301 | } |
| 302 | } |
| 303 | annotate_field_end (); |
| 304 | } |
| 305 | |
| 306 | if (dont_print_statmem == 0) |
| 307 | { |
| 308 | /* Free the space used to deal with the printing |
| 309 | of the members from top level. */ |
| 310 | obstack_free (&dont_print_statmem_obstack, last_dont_print); |
| 311 | dont_print_statmem_obstack = tmp_obstack; |
| 312 | } |
| 313 | |
| 314 | if (options->pretty) |
| 315 | { |
| 316 | fprintf_filtered (stream, "\n"); |
| 317 | print_spaces_filtered (2 * recurse, stream); |
| 318 | } |
| 319 | } /* if there are data fields */ |
| 320 | |
| 321 | fprintf_filtered (stream, "}"); |
| 322 | } |
| 323 | |
| 324 | /* Special val_print routine to avoid printing multiple copies of virtual |
| 325 | baseclasses. */ |
| 326 | |
| 327 | static void |
| 328 | cp_print_value (struct type *type, struct type *real_type, |
| 329 | const gdb_byte *valaddr, int offset, CORE_ADDR address, |
| 330 | struct ui_file *stream, int recurse, |
| 331 | const struct value_print_options *options, |
| 332 | struct type **dont_print_vb) |
| 333 | { |
| 334 | struct type **last_dont_print |
| 335 | = (struct type **) obstack_next_free (&dont_print_vb_obstack); |
| 336 | struct obstack tmp_obstack = dont_print_vb_obstack; |
| 337 | int i, n_baseclasses = TYPE_N_BASECLASSES (type); |
| 338 | int thisoffset; |
| 339 | struct type *thistype; |
| 340 | |
| 341 | if (dont_print_vb == 0) |
| 342 | { |
| 343 | /* If we're at top level, carve out a completely fresh |
| 344 | chunk of the obstack and use that until this particular |
| 345 | invocation returns. */ |
| 346 | /* Bump up the high-water mark. Now alpha is omega. */ |
| 347 | obstack_finish (&dont_print_vb_obstack); |
| 348 | } |
| 349 | |
| 350 | for (i = 0; i < n_baseclasses; i++) |
| 351 | { |
| 352 | int boffset; |
| 353 | int skip; |
| 354 | struct type *baseclass = check_typedef (TYPE_BASECLASS (type, i)); |
| 355 | char *basename = TYPE_NAME (baseclass); |
| 356 | const gdb_byte *base_valaddr; |
| 357 | |
| 358 | if (BASETYPE_VIA_VIRTUAL (type, i)) |
| 359 | { |
| 360 | struct type **first_dont_print |
| 361 | = (struct type **) obstack_base (&dont_print_vb_obstack); |
| 362 | |
| 363 | int j = (struct type **) obstack_next_free (&dont_print_vb_obstack) |
| 364 | - first_dont_print; |
| 365 | |
| 366 | while (--j >= 0) |
| 367 | if (baseclass == first_dont_print[j]) |
| 368 | goto flush_it; |
| 369 | |
| 370 | obstack_ptr_grow (&dont_print_vb_obstack, baseclass); |
| 371 | } |
| 372 | |
| 373 | thisoffset = offset; |
| 374 | thistype = real_type; |
| 375 | |
| 376 | boffset = baseclass_offset (type, i, valaddr + offset, address); |
| 377 | skip = ((boffset == -1) || (boffset + offset) < 0) ? 1 : -1; |
| 378 | |
| 379 | if (BASETYPE_VIA_VIRTUAL (type, i)) |
| 380 | { |
| 381 | /* The virtual base class pointer might have been |
| 382 | clobbered by the user program. Make sure that it |
| 383 | still points to a valid memory location. */ |
| 384 | |
| 385 | if (boffset != -1 |
| 386 | && ((boffset + offset) < 0 |
| 387 | || (boffset + offset) >= TYPE_LENGTH (type))) |
| 388 | { |
| 389 | /* FIXME (alloca): unsafe if baseclass is really really large. */ |
| 390 | gdb_byte *buf = alloca (TYPE_LENGTH (baseclass)); |
| 391 | base_valaddr = buf; |
| 392 | if (target_read_memory (address + boffset, buf, |
| 393 | TYPE_LENGTH (baseclass)) != 0) |
| 394 | skip = 1; |
| 395 | address = address + boffset; |
| 396 | thisoffset = 0; |
| 397 | boffset = 0; |
| 398 | thistype = baseclass; |
| 399 | } |
| 400 | else |
| 401 | base_valaddr = valaddr; |
| 402 | } |
| 403 | else |
| 404 | base_valaddr = valaddr; |
| 405 | |
| 406 | /* now do the printing */ |
| 407 | if (options->pretty) |
| 408 | { |
| 409 | fprintf_filtered (stream, "\n"); |
| 410 | print_spaces_filtered (2 * recurse, stream); |
| 411 | } |
| 412 | fputs_filtered ("<", stream); |
| 413 | /* Not sure what the best notation is in the case where there is no |
| 414 | baseclass name. */ |
| 415 | fputs_filtered (basename ? basename : "", stream); |
| 416 | fputs_filtered ("> = ", stream); |
| 417 | |
| 418 | |
| 419 | if (skip >= 1) |
| 420 | fprintf_filtered (stream, "<invalid address>"); |
| 421 | else |
| 422 | { |
| 423 | int result = 0; |
| 424 | |
| 425 | /* Attempt to run the Python pretty-printers on the |
| 426 | baseclass if possible. */ |
| 427 | if (!options->raw) |
| 428 | result = apply_val_pretty_printer (baseclass, base_valaddr, |
| 429 | thisoffset + boffset, |
| 430 | address + boffset, |
| 431 | stream, recurse, |
| 432 | options, |
| 433 | current_language); |
| 434 | |
| 435 | if (!result) |
| 436 | cp_print_value_fields (baseclass, thistype, base_valaddr, |
| 437 | thisoffset + boffset, address + boffset, |
| 438 | stream, recurse, options, |
| 439 | ((struct type **) |
| 440 | obstack_base (&dont_print_vb_obstack)), |
| 441 | 0); |
| 442 | } |
| 443 | fputs_filtered (", ", stream); |
| 444 | |
| 445 | flush_it: |
| 446 | ; |
| 447 | } |
| 448 | |
| 449 | if (dont_print_vb == 0) |
| 450 | { |
| 451 | /* Free the space used to deal with the printing |
| 452 | of this type from top level. */ |
| 453 | obstack_free (&dont_print_vb_obstack, last_dont_print); |
| 454 | /* Reset watermark so that we can continue protecting |
| 455 | ourselves from whatever we were protecting ourselves. */ |
| 456 | dont_print_vb_obstack = tmp_obstack; |
| 457 | } |
| 458 | } |
| 459 | |
| 460 | /* Print value of a static member. |
| 461 | To avoid infinite recursion when printing a class that contains |
| 462 | a static instance of the class, we keep the addresses of all printed |
| 463 | static member classes in an obstack and refuse to print them more |
| 464 | than once. |
| 465 | |
| 466 | VAL contains the value to print, TYPE, STREAM, RECURSE, and OPTIONS |
| 467 | have the same meanings as in c_val_print. */ |
| 468 | |
| 469 | static void |
| 470 | cp_print_static_field (struct type *type, |
| 471 | struct value *val, |
| 472 | struct ui_file *stream, |
| 473 | int recurse, |
| 474 | const struct value_print_options *options) |
| 475 | { |
| 476 | struct value_print_options opts; |
| 477 | if (TYPE_CODE (type) == TYPE_CODE_STRUCT) |
| 478 | { |
| 479 | CORE_ADDR *first_dont_print; |
| 480 | CORE_ADDR addr; |
| 481 | int i; |
| 482 | |
| 483 | first_dont_print |
| 484 | = (CORE_ADDR *) obstack_base (&dont_print_statmem_obstack); |
| 485 | i = (CORE_ADDR *) obstack_next_free (&dont_print_statmem_obstack) |
| 486 | - first_dont_print; |
| 487 | |
| 488 | while (--i >= 0) |
| 489 | { |
| 490 | if (value_address (val) == first_dont_print[i]) |
| 491 | { |
| 492 | fputs_filtered ("<same as static member of an already" |
| 493 | " seen type>", |
| 494 | stream); |
| 495 | return; |
| 496 | } |
| 497 | } |
| 498 | |
| 499 | addr = value_address (val); |
| 500 | obstack_grow (&dont_print_statmem_obstack, (char *) &addr, |
| 501 | sizeof (CORE_ADDR)); |
| 502 | |
| 503 | CHECK_TYPEDEF (type); |
| 504 | cp_print_value_fields (type, type, value_contents_all (val), |
| 505 | value_embedded_offset (val), addr, |
| 506 | stream, recurse, options, NULL, 1); |
| 507 | return; |
| 508 | } |
| 509 | |
| 510 | opts = *options; |
| 511 | opts.deref_ref = 0; |
| 512 | val_print (type, value_contents_all (val), |
| 513 | value_embedded_offset (val), value_address (val), |
| 514 | stream, recurse, &opts, current_language); |
| 515 | } |
| 516 | |
| 517 | |
| 518 | /* Find the field in *DOMAIN, or its non-virtual base classes, with bit offset |
| 519 | OFFSET. Set *DOMAIN to the containing type and *FIELDNO to the containing |
| 520 | field number. If OFFSET is not exactly at the start of some field, set |
| 521 | *DOMAIN to NULL. */ |
| 522 | |
| 523 | static void |
| 524 | cp_find_class_member (struct type **domain_p, int *fieldno, |
| 525 | LONGEST offset) |
| 526 | { |
| 527 | struct type *domain; |
| 528 | unsigned int i; |
| 529 | unsigned len; |
| 530 | |
| 531 | *domain_p = check_typedef (*domain_p); |
| 532 | domain = *domain_p; |
| 533 | len = TYPE_NFIELDS (domain); |
| 534 | |
| 535 | for (i = TYPE_N_BASECLASSES (domain); i < len; i++) |
| 536 | { |
| 537 | LONGEST bitpos = TYPE_FIELD_BITPOS (domain, i); |
| 538 | |
| 539 | QUIT; |
| 540 | if (offset == bitpos) |
| 541 | { |
| 542 | *fieldno = i; |
| 543 | return; |
| 544 | } |
| 545 | } |
| 546 | |
| 547 | for (i = 0; i < TYPE_N_BASECLASSES (domain); i++) |
| 548 | { |
| 549 | LONGEST bitpos = TYPE_FIELD_BITPOS (domain, i); |
| 550 | LONGEST bitsize = 8 * TYPE_LENGTH (TYPE_FIELD_TYPE (domain, i)); |
| 551 | |
| 552 | if (offset >= bitpos && offset < bitpos + bitsize) |
| 553 | { |
| 554 | *domain_p = TYPE_FIELD_TYPE (domain, i); |
| 555 | cp_find_class_member (domain_p, fieldno, offset - bitpos); |
| 556 | return; |
| 557 | } |
| 558 | } |
| 559 | |
| 560 | *domain_p = NULL; |
| 561 | } |
| 562 | |
| 563 | void |
| 564 | cp_print_class_member (const gdb_byte *valaddr, struct type *type, |
| 565 | struct ui_file *stream, char *prefix) |
| 566 | { |
| 567 | enum bfd_endian byte_order = gdbarch_byte_order (get_type_arch (type)); |
| 568 | |
| 569 | /* VAL is a byte offset into the structure type DOMAIN. |
| 570 | Find the name of the field for that offset and |
| 571 | print it. */ |
| 572 | struct type *domain = TYPE_DOMAIN_TYPE (type); |
| 573 | LONGEST val; |
| 574 | unsigned int fieldno; |
| 575 | |
| 576 | val = extract_signed_integer (valaddr, TYPE_LENGTH (type), byte_order); |
| 577 | |
| 578 | /* Pointers to data members are usually byte offsets into an object. |
| 579 | Because a data member can have offset zero, and a NULL pointer to |
| 580 | member must be distinct from any valid non-NULL pointer to |
| 581 | member, either the value is biased or the NULL value has a |
| 582 | special representation; both are permitted by ISO C++. HP aCC |
| 583 | used a bias of 0x20000000; HP cfront used a bias of 1; g++ 3.x |
| 584 | and other compilers which use the Itanium ABI use -1 as the NULL |
| 585 | value. GDB only supports that last form; to add support for |
| 586 | another form, make this into a cp-abi hook. */ |
| 587 | |
| 588 | if (val == -1) |
| 589 | { |
| 590 | fprintf_filtered (stream, "NULL"); |
| 591 | return; |
| 592 | } |
| 593 | |
| 594 | cp_find_class_member (&domain, &fieldno, val << 3); |
| 595 | |
| 596 | if (domain != NULL) |
| 597 | { |
| 598 | char *name; |
| 599 | fputs_filtered (prefix, stream); |
| 600 | name = type_name_no_tag (domain); |
| 601 | if (name) |
| 602 | fputs_filtered (name, stream); |
| 603 | else |
| 604 | c_type_print_base (domain, stream, 0, 0); |
| 605 | fprintf_filtered (stream, "::"); |
| 606 | fputs_filtered (TYPE_FIELD_NAME (domain, fieldno), stream); |
| 607 | } |
| 608 | else |
| 609 | fprintf_filtered (stream, "%ld", (long) val); |
| 610 | } |
| 611 | |
| 612 | |
| 613 | void |
| 614 | _initialize_cp_valprint (void) |
| 615 | { |
| 616 | add_setshow_boolean_cmd ("static-members", class_support, |
| 617 | &user_print_options.static_field_print, _("\ |
| 618 | Set printing of C++ static members."), _("\ |
| 619 | Show printing of C++ static members."), NULL, |
| 620 | NULL, |
| 621 | show_static_field_print, |
| 622 | &setprintlist, &showprintlist); |
| 623 | |
| 624 | add_setshow_boolean_cmd ("vtbl", class_support, |
| 625 | &user_print_options.vtblprint, _("\ |
| 626 | Set printing of C++ virtual function tables."), _("\ |
| 627 | Show printing of C++ virtual function tables."), NULL, |
| 628 | NULL, |
| 629 | show_vtblprint, |
| 630 | &setprintlist, &showprintlist); |
| 631 | |
| 632 | add_setshow_boolean_cmd ("object", class_support, |
| 633 | &user_print_options.objectprint, _("\ |
| 634 | Set printing of object's derived type based on vtable info."), _("\ |
| 635 | Show printing of object's derived type based on vtable info."), NULL, |
| 636 | NULL, |
| 637 | show_objectprint, |
| 638 | &setprintlist, &showprintlist); |
| 639 | |
| 640 | obstack_begin (&dont_print_vb_obstack, 32 * sizeof (struct type *)); |
| 641 | obstack_specify_allocation (&dont_print_statmem_obstack, |
| 642 | 32 * sizeof (CORE_ADDR), sizeof (CORE_ADDR), |
| 643 | xmalloc, xfree); |
| 644 | } |