1 /* Generic code for supporting multiple C++ ABI's 2 3 Copyright (C) 2001, 2002, 2003, 2005, 2006, 2007, 2008, 2009 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 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 bfd_byte *valaddr, 74 CORE_ADDR address) 75 { 76 if (current_cp_abi.baseclass_offset == NULL) 77 error (_("ABI doesn't define required function baseclass_offset")); 78 return (*current_cp_abi.baseclass_offset) (type, index, valaddr, address); 79 } 80 81 struct value * 82 value_virtual_fn_field (struct value **arg1p, struct fn_field *f, int j, 83 struct type *type, int offset) 84 { 85 if ((current_cp_abi.virtual_fn_field) == NULL) 86 return NULL; 87 return (*current_cp_abi.virtual_fn_field) (arg1p, f, j, type, offset); 88 } 89 90 struct type * 91 value_rtti_type (struct value *v, int *full, int *top, int *using_enc) 92 { 93 struct type *ret = NULL; 94 struct gdb_exception e; 95 if ((current_cp_abi.rtti_type) == NULL) 96 return NULL; 97 TRY_CATCH (e, RETURN_MASK_ERROR) 98 { 99 ret = (*current_cp_abi.rtti_type) (v, full, top, using_enc); 100 } 101 if (e.reason < 0) 102 return NULL; 103 return ret; 104 } 105 106 void 107 cplus_print_method_ptr (const gdb_byte *contents, struct type *type, 108 struct ui_file *stream) 109 { 110 if (current_cp_abi.print_method_ptr == NULL) 111 error (_("GDB does not support pointers to methods on this target")); 112 (*current_cp_abi.print_method_ptr) (contents, type, stream); 113 } 114 115 int 116 cplus_method_ptr_size (struct type *to_type) 117 { 118 if (current_cp_abi.method_ptr_size == NULL) 119 error (_("GDB does not support pointers to methods on this target")); 120 return (*current_cp_abi.method_ptr_size) (to_type); 121 } 122 123 void 124 cplus_make_method_ptr (struct type *type, gdb_byte *contents, 125 CORE_ADDR value, int is_virtual) 126 { 127 if (current_cp_abi.make_method_ptr == NULL) 128 error (_("GDB does not support pointers to methods on this target")); 129 (*current_cp_abi.make_method_ptr) (type, contents, value, is_virtual); 130 } 131 132 CORE_ADDR 133 cplus_skip_trampoline (struct frame_info *frame, CORE_ADDR stop_pc) 134 { 135 if (current_cp_abi.skip_trampoline == NULL) 136 return 0; 137 return (*current_cp_abi.skip_trampoline) (frame, stop_pc); 138 } 139 140 struct value * 141 cplus_method_ptr_to_value (struct value **this_p, struct value *method_ptr) 142 { 143 if (current_cp_abi.method_ptr_to_value == NULL) 144 error (_("GDB does not support pointers to methods on this target")); 145 return (*current_cp_abi.method_ptr_to_value) (this_p, method_ptr); 146 } 147 148 int 149 cp_pass_by_reference (struct type *type) 150 { 151 if ((current_cp_abi.pass_by_reference) == NULL) 152 return 0; 153 return (*current_cp_abi.pass_by_reference) (type); 154 } 155 156 /* Set the current C++ ABI to SHORT_NAME. */ 157 158 static int 159 switch_to_cp_abi (const char *short_name) 160 { 161 struct cp_abi_ops *abi; 162 163 abi = find_cp_abi (short_name); 164 if (abi == NULL) 165 return 0; 166 167 current_cp_abi = *abi; 168 return 1; 169 } 170 171 /* Add ABI to the list of supported C++ ABI's. */ 172 173 int 174 register_cp_abi (struct cp_abi_ops *abi) 175 { 176 if (num_cp_abis == CP_ABI_MAX) 177 internal_error (__FILE__, __LINE__, 178 _("Too many C++ ABIs, please increase CP_ABI_MAX in cp-abi.c")); 179 180 cp_abis[num_cp_abis++] = abi; 181 182 return 1; 183 } 184 185 /* Set the ABI to use in "auto" mode to SHORT_NAME. */ 186 187 void 188 set_cp_abi_as_auto_default (const char *short_name) 189 { 190 char *new_longname, *new_doc; 191 struct cp_abi_ops *abi = find_cp_abi (short_name); 192 193 if (abi == NULL) 194 internal_error (__FILE__, __LINE__, 195 _("Cannot find C++ ABI \"%s\" to set it as auto default."), 196 short_name); 197 198 if (auto_cp_abi.longname != NULL) 199 xfree ((char *) auto_cp_abi.longname); 200 if (auto_cp_abi.doc != NULL) 201 xfree ((char *) auto_cp_abi.doc); 202 203 auto_cp_abi = *abi; 204 205 auto_cp_abi.shortname = "auto"; 206 new_longname = xstrprintf ("currently \"%s\"", abi->shortname); 207 auto_cp_abi.longname = new_longname; 208 209 new_doc = xstrprintf ("Automatically selected; currently \"%s\"", 210 abi->shortname); 211 auto_cp_abi.doc = new_doc; 212 213 /* Since we copy the current ABI into current_cp_abi instead of 214 using a pointer, if auto is currently the default, we need to 215 reset it. */ 216 if (strcmp (current_cp_abi.shortname, "auto") == 0) 217 switch_to_cp_abi ("auto"); 218 } 219 220 /* Return the ABI operations associated with SHORT_NAME. */ 221 222 static struct cp_abi_ops * 223 find_cp_abi (const char *short_name) 224 { 225 int i; 226 227 for (i = 0; i < num_cp_abis; i++) 228 if (strcmp (cp_abis[i]->shortname, short_name) == 0) 229 return cp_abis[i]; 230 231 return NULL; 232 } 233 234 /* Display the list of registered C++ ABIs. */ 235 236 static void 237 list_cp_abis (int from_tty) 238 { 239 struct cleanup *cleanup_chain; 240 int i; 241 ui_out_text (uiout, "The available C++ ABIs are:\n"); 242 243 cleanup_chain = make_cleanup_ui_out_tuple_begin_end (uiout, "cp-abi-list"); 244 for (i = 0; i < num_cp_abis; i++) 245 { 246 char pad[14]; 247 int padcount; 248 249 ui_out_text (uiout, " "); 250 ui_out_field_string (uiout, "cp-abi", cp_abis[i]->shortname); 251 252 padcount = 16 - 2 - strlen (cp_abis[i]->shortname); 253 pad[padcount] = 0; 254 while (padcount > 0) 255 pad[--padcount] = ' '; 256 ui_out_text (uiout, pad); 257 258 ui_out_field_string (uiout, "doc", cp_abis[i]->doc); 259 ui_out_text (uiout, "\n"); 260 } 261 do_cleanups (cleanup_chain); 262 } 263 264 /* Set the current C++ ABI, or display the list of options if no 265 argument is given. */ 266 267 static void 268 set_cp_abi_cmd (char *args, int from_tty) 269 { 270 if (args == NULL) 271 { 272 list_cp_abis (from_tty); 273 return; 274 } 275 276 if (!switch_to_cp_abi (args)) 277 error (_("Could not find \"%s\" in ABI list"), args); 278 } 279 280 /* Show the currently selected C++ ABI. */ 281 282 static void 283 show_cp_abi_cmd (char *args, int from_tty) 284 { 285 ui_out_text (uiout, "The currently selected C++ ABI is \""); 286 287 ui_out_field_string (uiout, "cp-abi", current_cp_abi.shortname); 288 ui_out_text (uiout, "\" ("); 289 ui_out_field_string (uiout, "longname", current_cp_abi.longname); 290 ui_out_text (uiout, ").\n"); 291 } 292 293 extern initialize_file_ftype _initialize_cp_abi; /* -Wmissing-prototypes */ 294 295 void 296 _initialize_cp_abi (void) 297 { 298 register_cp_abi (&auto_cp_abi); 299 switch_to_cp_abi ("auto"); 300 301 add_cmd ("cp-abi", class_obscure, set_cp_abi_cmd, _("\ 302 Set the ABI used for inspecting C++ objects.\n\ 303 \"set cp-abi\" with no arguments will list the available ABIs."), 304 &setlist); 305 306 add_cmd ("cp-abi", class_obscure, show_cp_abi_cmd, 307 _("Show the ABI used for inspecting C++ objects."), &showlist); 308 } 309