1 /* Generic code for supporting multiple C++ ABI's 2 3 Copyright (C) 2001, 2002, 2003, 2005, 2006, 2007, 2008, 2009, 2010, 2011 4 Free Software Foundation, Inc. 5 6 This file is part of GDB. 7 8 This program is free software; you can redistribute it and/or modify 9 it under the terms of the GNU General Public License as published by 10 the Free Software Foundation; either version 3 of the License, or 11 (at your option) any later version. 12 13 This program is distributed in the hope that it will be useful, 14 but WITHOUT ANY WARRANTY; without even the implied warranty of 15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 16 GNU General Public License for more details. 17 18 You should have received a copy of the GNU General Public License 19 along with this program. If not, see <http://www.gnu.org/licenses/>. */ 20 21 #include "defs.h" 22 #include "value.h" 23 #include "cp-abi.h" 24 #include "command.h" 25 #include "exceptions.h" 26 #include "gdbcmd.h" 27 #include "ui-out.h" 28 #include "gdb_assert.h" 29 #include "gdb_string.h" 30 31 static struct cp_abi_ops *find_cp_abi (const char *short_name); 32 33 static struct cp_abi_ops current_cp_abi = { "", NULL }; 34 static struct cp_abi_ops auto_cp_abi = { "auto", NULL }; 35 36 #define CP_ABI_MAX 8 37 static struct cp_abi_ops *cp_abis[CP_ABI_MAX]; 38 static int num_cp_abis = 0; 39 40 enum ctor_kinds 41 is_constructor_name (const char *name) 42 { 43 if ((current_cp_abi.is_constructor_name) == NULL) 44 error (_("ABI doesn't define required function is_constructor_name")); 45 return (*current_cp_abi.is_constructor_name) (name); 46 } 47 48 enum dtor_kinds 49 is_destructor_name (const char *name) 50 { 51 if ((current_cp_abi.is_destructor_name) == NULL) 52 error (_("ABI doesn't define required function is_destructor_name")); 53 return (*current_cp_abi.is_destructor_name) (name); 54 } 55 56 int 57 is_vtable_name (const char *name) 58 { 59 if ((current_cp_abi.is_vtable_name) == NULL) 60 error (_("ABI doesn't define required function is_vtable_name")); 61 return (*current_cp_abi.is_vtable_name) (name); 62 } 63 64 int 65 is_operator_name (const char *name) 66 { 67 if ((current_cp_abi.is_operator_name) == NULL) 68 error (_("ABI doesn't define required function is_operator_name")); 69 return (*current_cp_abi.is_operator_name) (name); 70 } 71 72 int 73 baseclass_offset (struct type *type, int index, const gdb_byte *valaddr, 74 int embedded_offset, CORE_ADDR address, 75 const struct value *val) 76 { 77 volatile struct gdb_exception ex; 78 int res = 0; 79 80 gdb_assert (current_cp_abi.baseclass_offset != NULL); 81 82 TRY_CATCH (ex, RETURN_MASK_ERROR) 83 { 84 res = (*current_cp_abi.baseclass_offset) (type, index, valaddr, 85 embedded_offset, 86 address, val); 87 } 88 89 if (ex.reason < 0 && ex.error == NOT_AVAILABLE_ERROR) 90 throw_error (NOT_AVAILABLE_ERROR, 91 _("Cannot determine virtual baseclass offset " 92 "of incomplete object")); 93 else if (ex.reason < 0) 94 throw_exception (ex); 95 else 96 return res; 97 } 98 99 struct value * 100 value_virtual_fn_field (struct value **arg1p, 101 struct fn_field *f, int j, 102 struct type *type, int offset) 103 { 104 if ((current_cp_abi.virtual_fn_field) == NULL) 105 return NULL; 106 return (*current_cp_abi.virtual_fn_field) (arg1p, f, j, 107 type, offset); 108 } 109 110 struct type * 111 value_rtti_type (struct value *v, int *full, 112 int *top, int *using_enc) 113 { 114 struct type *ret = NULL; 115 struct gdb_exception e; 116 117 if ((current_cp_abi.rtti_type) == NULL) 118 return NULL; 119 TRY_CATCH (e, RETURN_MASK_ERROR) 120 { 121 ret = (*current_cp_abi.rtti_type) (v, full, top, using_enc); 122 } 123 if (e.reason < 0) 124 return NULL; 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 int 174 cp_pass_by_reference (struct type *type) 175 { 176 if ((current_cp_abi.pass_by_reference) == NULL) 177 return 0; 178 return (*current_cp_abi.pass_by_reference) (type); 179 } 180 181 /* Set the current C++ ABI to SHORT_NAME. */ 182 183 static int 184 switch_to_cp_abi (const char *short_name) 185 { 186 struct cp_abi_ops *abi; 187 188 abi = find_cp_abi (short_name); 189 if (abi == NULL) 190 return 0; 191 192 current_cp_abi = *abi; 193 return 1; 194 } 195 196 /* Add ABI to the list of supported C++ ABI's. */ 197 198 int 199 register_cp_abi (struct cp_abi_ops *abi) 200 { 201 if (num_cp_abis == CP_ABI_MAX) 202 internal_error (__FILE__, __LINE__, 203 _("Too many C++ ABIs, please increase " 204 "CP_ABI_MAX in cp-abi.c")); 205 206 cp_abis[num_cp_abis++] = abi; 207 208 return 1; 209 } 210 211 /* Set the ABI to use in "auto" mode to SHORT_NAME. */ 212 213 void 214 set_cp_abi_as_auto_default (const char *short_name) 215 { 216 char *new_longname, *new_doc; 217 struct cp_abi_ops *abi = find_cp_abi (short_name); 218 219 if (abi == NULL) 220 internal_error (__FILE__, __LINE__, 221 _("Cannot find C++ ABI \"%s\" to set it as auto default."), 222 short_name); 223 224 if (auto_cp_abi.longname != NULL) 225 xfree ((char *) auto_cp_abi.longname); 226 if (auto_cp_abi.doc != NULL) 227 xfree ((char *) auto_cp_abi.doc); 228 229 auto_cp_abi = *abi; 230 231 auto_cp_abi.shortname = "auto"; 232 new_longname = xstrprintf ("currently \"%s\"", abi->shortname); 233 auto_cp_abi.longname = new_longname; 234 235 new_doc = xstrprintf ("Automatically selected; currently \"%s\"", 236 abi->shortname); 237 auto_cp_abi.doc = new_doc; 238 239 /* Since we copy the current ABI into current_cp_abi instead of 240 using a pointer, if auto is currently the default, we need to 241 reset it. */ 242 if (strcmp (current_cp_abi.shortname, "auto") == 0) 243 switch_to_cp_abi ("auto"); 244 } 245 246 /* Return the ABI operations associated with SHORT_NAME. */ 247 248 static struct cp_abi_ops * 249 find_cp_abi (const char *short_name) 250 { 251 int i; 252 253 for (i = 0; i < num_cp_abis; i++) 254 if (strcmp (cp_abis[i]->shortname, short_name) == 0) 255 return cp_abis[i]; 256 257 return NULL; 258 } 259 260 /* Display the list of registered C++ ABIs. */ 261 262 static void 263 list_cp_abis (int from_tty) 264 { 265 struct cleanup *cleanup_chain; 266 int i; 267 268 ui_out_text (uiout, "The available C++ ABIs are:\n"); 269 cleanup_chain = make_cleanup_ui_out_tuple_begin_end (uiout, 270 "cp-abi-list"); 271 for (i = 0; i < num_cp_abis; i++) 272 { 273 char pad[14]; 274 int padcount; 275 276 ui_out_text (uiout, " "); 277 ui_out_field_string (uiout, "cp-abi", cp_abis[i]->shortname); 278 279 padcount = 16 - 2 - strlen (cp_abis[i]->shortname); 280 pad[padcount] = 0; 281 while (padcount > 0) 282 pad[--padcount] = ' '; 283 ui_out_text (uiout, pad); 284 285 ui_out_field_string (uiout, "doc", cp_abis[i]->doc); 286 ui_out_text (uiout, "\n"); 287 } 288 do_cleanups (cleanup_chain); 289 } 290 291 /* Set the current C++ ABI, or display the list of options if no 292 argument is given. */ 293 294 static void 295 set_cp_abi_cmd (char *args, int from_tty) 296 { 297 if (args == NULL) 298 { 299 list_cp_abis (from_tty); 300 return; 301 } 302 303 if (!switch_to_cp_abi (args)) 304 error (_("Could not find \"%s\" in ABI list"), args); 305 } 306 307 /* Show the currently selected C++ ABI. */ 308 309 static void 310 show_cp_abi_cmd (char *args, int from_tty) 311 { 312 ui_out_text (uiout, "The currently selected C++ ABI is \""); 313 314 ui_out_field_string (uiout, "cp-abi", current_cp_abi.shortname); 315 ui_out_text (uiout, "\" ("); 316 ui_out_field_string (uiout, "longname", current_cp_abi.longname); 317 ui_out_text (uiout, ").\n"); 318 } 319 320 extern initialize_file_ftype _initialize_cp_abi; /* -Wmissing-prototypes */ 321 322 void 323 _initialize_cp_abi (void) 324 { 325 register_cp_abi (&auto_cp_abi); 326 switch_to_cp_abi ("auto"); 327 328 add_cmd ("cp-abi", class_obscure, set_cp_abi_cmd, _("\ 329 Set the ABI used for inspecting C++ objects.\n\ 330 \"set cp-abi\" with no arguments will list the available ABIs."), 331 &setlist); 332 333 add_cmd ("cp-abi", class_obscure, show_cp_abi_cmd, 334 _("Show the ABI used for inspecting C++ objects."), 335 &showlist); 336 } 337