1 /* Generic code for supporting multiple C++ ABI's 2 3 Copyright (C) 2001-2016 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 3 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, see <http://www.gnu.org/licenses/>. */ 19 20 #include "defs.h" 21 #include "value.h" 22 #include "cp-abi.h" 23 #include "command.h" 24 #include "gdbcmd.h" 25 #include "ui-out.h" 26 static struct cp_abi_ops *find_cp_abi (const char *short_name); 27 28 static struct cp_abi_ops current_cp_abi = { "", NULL }; 29 static struct cp_abi_ops auto_cp_abi = { "auto", NULL }; 30 31 #define CP_ABI_MAX 8 32 static struct cp_abi_ops *cp_abis[CP_ABI_MAX]; 33 static int num_cp_abis = 0; 34 35 enum ctor_kinds 36 is_constructor_name (const char *name) 37 { 38 if ((current_cp_abi.is_constructor_name) == NULL) 39 error (_("ABI doesn't define required function is_constructor_name")); 40 return (*current_cp_abi.is_constructor_name) (name); 41 } 42 43 enum dtor_kinds 44 is_destructor_name (const char *name) 45 { 46 if ((current_cp_abi.is_destructor_name) == NULL) 47 error (_("ABI doesn't define required function is_destructor_name")); 48 return (*current_cp_abi.is_destructor_name) (name); 49 } 50 51 int 52 is_vtable_name (const char *name) 53 { 54 if ((current_cp_abi.is_vtable_name) == NULL) 55 error (_("ABI doesn't define required function is_vtable_name")); 56 return (*current_cp_abi.is_vtable_name) (name); 57 } 58 59 int 60 is_operator_name (const char *name) 61 { 62 if ((current_cp_abi.is_operator_name) == NULL) 63 error (_("ABI doesn't define required function is_operator_name")); 64 return (*current_cp_abi.is_operator_name) (name); 65 } 66 67 int 68 baseclass_offset (struct type *type, int index, const gdb_byte *valaddr, 69 LONGEST embedded_offset, CORE_ADDR address, 70 const struct value *val) 71 { 72 int res = 0; 73 74 gdb_assert (current_cp_abi.baseclass_offset != NULL); 75 76 TRY 77 { 78 res = (*current_cp_abi.baseclass_offset) (type, index, valaddr, 79 embedded_offset, 80 address, val); 81 } 82 CATCH (ex, RETURN_MASK_ERROR) 83 { 84 if (ex.error != NOT_AVAILABLE_ERROR) 85 throw_exception (ex); 86 87 throw_error (NOT_AVAILABLE_ERROR, 88 _("Cannot determine virtual baseclass offset " 89 "of incomplete object")); 90 } 91 END_CATCH 92 93 return res; 94 } 95 96 struct value * 97 value_virtual_fn_field (struct value **arg1p, 98 struct fn_field *f, int j, 99 struct type *type, int offset) 100 { 101 if ((current_cp_abi.virtual_fn_field) == NULL) 102 return NULL; 103 return (*current_cp_abi.virtual_fn_field) (arg1p, f, j, 104 type, offset); 105 } 106 107 struct type * 108 value_rtti_type (struct value *v, int *full, 109 LONGEST *top, int *using_enc) 110 { 111 struct type *ret = NULL; 112 113 if ((current_cp_abi.rtti_type) == NULL) 114 return NULL; 115 TRY 116 { 117 ret = (*current_cp_abi.rtti_type) (v, full, top, using_enc); 118 } 119 CATCH (e, RETURN_MASK_ERROR) 120 { 121 return NULL; 122 } 123 END_CATCH 124 125 return ret; 126 } 127 128 void 129 cplus_print_method_ptr (const gdb_byte *contents, 130 struct type *type, 131 struct ui_file *stream) 132 { 133 if (current_cp_abi.print_method_ptr == NULL) 134 error (_("GDB does not support pointers to methods on this target")); 135 (*current_cp_abi.print_method_ptr) (contents, type, stream); 136 } 137 138 int 139 cplus_method_ptr_size (struct type *to_type) 140 { 141 if (current_cp_abi.method_ptr_size == NULL) 142 error (_("GDB does not support pointers to methods on this target")); 143 return (*current_cp_abi.method_ptr_size) (to_type); 144 } 145 146 void 147 cplus_make_method_ptr (struct type *type, gdb_byte *contents, 148 CORE_ADDR value, int is_virtual) 149 { 150 if (current_cp_abi.make_method_ptr == NULL) 151 error (_("GDB does not support pointers to methods on this target")); 152 (*current_cp_abi.make_method_ptr) (type, contents, value, is_virtual); 153 } 154 155 CORE_ADDR 156 cplus_skip_trampoline (struct frame_info *frame, 157 CORE_ADDR stop_pc) 158 { 159 if (current_cp_abi.skip_trampoline == NULL) 160 return 0; 161 return (*current_cp_abi.skip_trampoline) (frame, stop_pc); 162 } 163 164 struct value * 165 cplus_method_ptr_to_value (struct value **this_p, 166 struct value *method_ptr) 167 { 168 if (current_cp_abi.method_ptr_to_value == NULL) 169 error (_("GDB does not support pointers to methods on this target")); 170 return (*current_cp_abi.method_ptr_to_value) (this_p, method_ptr); 171 } 172 173 /* See cp-abi.h. */ 174 175 void 176 cplus_print_vtable (struct value *value) 177 { 178 if (current_cp_abi.print_vtable == NULL) 179 error (_("GDB cannot print the vtable on this target")); 180 (*current_cp_abi.print_vtable) (value); 181 } 182 183 /* See cp-abi.h. */ 184 185 struct value * 186 cplus_typeid (struct value *value) 187 { 188 if (current_cp_abi.get_typeid == NULL) 189 error (_("GDB cannot find the typeid on this target")); 190 return (*current_cp_abi.get_typeid) (value); 191 } 192 193 /* See cp-abi.h. */ 194 195 struct type * 196 cplus_typeid_type (struct gdbarch *gdbarch) 197 { 198 if (current_cp_abi.get_typeid_type == NULL) 199 error (_("GDB cannot find the type for 'typeid' on this target")); 200 return (*current_cp_abi.get_typeid_type) (gdbarch); 201 } 202 203 /* See cp-abi.h. */ 204 205 struct type * 206 cplus_type_from_type_info (struct value *value) 207 { 208 if (current_cp_abi.get_type_from_type_info == NULL) 209 error (_("GDB cannot find the type from a std::type_info on this target")); 210 return (*current_cp_abi.get_type_from_type_info) (value); 211 } 212 213 /* See cp-abi.h. */ 214 215 char * 216 cplus_typename_from_type_info (struct value *value) 217 { 218 if (current_cp_abi.get_typename_from_type_info == NULL) 219 error (_("GDB cannot find the type name " 220 "from a std::type_info on this target")); 221 return (*current_cp_abi.get_typename_from_type_info) (value); 222 } 223 224 int 225 cp_pass_by_reference (struct type *type) 226 { 227 if ((current_cp_abi.pass_by_reference) == NULL) 228 return 0; 229 return (*current_cp_abi.pass_by_reference) (type); 230 } 231 232 /* Set the current C++ ABI to SHORT_NAME. */ 233 234 static int 235 switch_to_cp_abi (const char *short_name) 236 { 237 struct cp_abi_ops *abi; 238 239 abi = find_cp_abi (short_name); 240 if (abi == NULL) 241 return 0; 242 243 current_cp_abi = *abi; 244 return 1; 245 } 246 247 /* Add ABI to the list of supported C++ ABI's. */ 248 249 int 250 register_cp_abi (struct cp_abi_ops *abi) 251 { 252 if (num_cp_abis == CP_ABI_MAX) 253 internal_error (__FILE__, __LINE__, 254 _("Too many C++ ABIs, please increase " 255 "CP_ABI_MAX in cp-abi.c")); 256 257 cp_abis[num_cp_abis++] = abi; 258 259 return 1; 260 } 261 262 /* Set the ABI to use in "auto" mode to SHORT_NAME. */ 263 264 void 265 set_cp_abi_as_auto_default (const char *short_name) 266 { 267 char *new_longname, *new_doc; 268 struct cp_abi_ops *abi = find_cp_abi (short_name); 269 270 if (abi == NULL) 271 internal_error (__FILE__, __LINE__, 272 _("Cannot find C++ ABI \"%s\" to set it as auto default."), 273 short_name); 274 275 if (auto_cp_abi.longname != NULL) 276 xfree ((char *) auto_cp_abi.longname); 277 if (auto_cp_abi.doc != NULL) 278 xfree ((char *) auto_cp_abi.doc); 279 280 auto_cp_abi = *abi; 281 282 auto_cp_abi.shortname = "auto"; 283 new_longname = xstrprintf ("currently \"%s\"", abi->shortname); 284 auto_cp_abi.longname = new_longname; 285 286 new_doc = xstrprintf ("Automatically selected; currently \"%s\"", 287 abi->shortname); 288 auto_cp_abi.doc = new_doc; 289 290 /* Since we copy the current ABI into current_cp_abi instead of 291 using a pointer, if auto is currently the default, we need to 292 reset it. */ 293 if (strcmp (current_cp_abi.shortname, "auto") == 0) 294 switch_to_cp_abi ("auto"); 295 } 296 297 /* Return the ABI operations associated with SHORT_NAME. */ 298 299 static struct cp_abi_ops * 300 find_cp_abi (const char *short_name) 301 { 302 int i; 303 304 for (i = 0; i < num_cp_abis; i++) 305 if (strcmp (cp_abis[i]->shortname, short_name) == 0) 306 return cp_abis[i]; 307 308 return NULL; 309 } 310 311 /* Display the list of registered C++ ABIs. */ 312 313 static void 314 list_cp_abis (int from_tty) 315 { 316 struct ui_out *uiout = current_uiout; 317 struct cleanup *cleanup_chain; 318 int i; 319 320 ui_out_text (uiout, "The available C++ ABIs are:\n"); 321 cleanup_chain = make_cleanup_ui_out_tuple_begin_end (uiout, 322 "cp-abi-list"); 323 for (i = 0; i < num_cp_abis; i++) 324 { 325 char pad[14]; 326 int padcount; 327 328 ui_out_text (uiout, " "); 329 ui_out_field_string (uiout, "cp-abi", cp_abis[i]->shortname); 330 331 padcount = 16 - 2 - strlen (cp_abis[i]->shortname); 332 pad[padcount] = 0; 333 while (padcount > 0) 334 pad[--padcount] = ' '; 335 ui_out_text (uiout, pad); 336 337 ui_out_field_string (uiout, "doc", cp_abis[i]->doc); 338 ui_out_text (uiout, "\n"); 339 } 340 do_cleanups (cleanup_chain); 341 } 342 343 /* Set the current C++ ABI, or display the list of options if no 344 argument is given. */ 345 346 static void 347 set_cp_abi_cmd (char *args, int from_tty) 348 { 349 if (args == NULL) 350 { 351 list_cp_abis (from_tty); 352 return; 353 } 354 355 if (!switch_to_cp_abi (args)) 356 error (_("Could not find \"%s\" in ABI list"), args); 357 } 358 359 /* A completion function for "set cp-abi". */ 360 361 static VEC (char_ptr) * 362 cp_abi_completer (struct cmd_list_element *ignore, 363 const char *text, const char *word) 364 { 365 static const char **cp_abi_names; 366 367 if (cp_abi_names == NULL) 368 { 369 int i; 370 371 cp_abi_names = XNEWVEC (const char *, num_cp_abis + 1); 372 for (i = 0; i < num_cp_abis; ++i) 373 cp_abi_names[i] = cp_abis[i]->shortname; 374 cp_abi_names[i] = NULL; 375 } 376 377 return complete_on_enum (cp_abi_names, text, word); 378 } 379 380 /* Show the currently selected C++ ABI. */ 381 382 static void 383 show_cp_abi_cmd (char *args, int from_tty) 384 { 385 struct ui_out *uiout = current_uiout; 386 387 ui_out_text (uiout, "The currently selected C++ ABI is \""); 388 389 ui_out_field_string (uiout, "cp-abi", current_cp_abi.shortname); 390 ui_out_text (uiout, "\" ("); 391 ui_out_field_string (uiout, "longname", current_cp_abi.longname); 392 ui_out_text (uiout, ").\n"); 393 } 394 395 extern initialize_file_ftype _initialize_cp_abi; /* -Wmissing-prototypes */ 396 397 void 398 _initialize_cp_abi (void) 399 { 400 struct cmd_list_element *c; 401 402 register_cp_abi (&auto_cp_abi); 403 switch_to_cp_abi ("auto"); 404 405 c = add_cmd ("cp-abi", class_obscure, set_cp_abi_cmd, _("\ 406 Set the ABI used for inspecting C++ objects.\n\ 407 \"set cp-abi\" with no arguments will list the available ABIs."), 408 &setlist); 409 set_cmd_completer (c, cp_abi_completer); 410 411 add_cmd ("cp-abi", class_obscure, show_cp_abi_cmd, 412 _("Show the ABI used for inspecting C++ objects."), 413 &showlist); 414 } 415