gdb/cp-abi.c

   1 /* Generic code for supporting multiple C++ ABI's
   2
   3    Copyright (C) 2001-2014 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                   int embedded_offset, CORE_ADDR address,
  70                   const struct value *val)
  71 {
  72   volatile struct gdb_exception ex;
  73   int res = 0;
  74
  75   gdb_assert (current_cp_abi.baseclass_offset != NULL);
  76
  77   TRY_CATCH (ex, RETURN_MASK_ERROR)
  78     {
  79       res = (*current_cp_abi.baseclass_offset) (type, index, valaddr,
  80                                                 embedded_offset,
  81                                                 address, val);
  82     }
  83
  84   if (ex.reason < 0 && ex.error == NOT_AVAILABLE_ERROR)
  85     throw_error (NOT_AVAILABLE_ERROR,
  86                  _("Cannot determine virtual baseclass offset "
  87                    "of incomplete object"));
  88   else if (ex.reason < 0)
  89     throw_exception (ex);
  90   else
  91     return res;
  92 }
  93
  94 struct value *
  95 value_virtual_fn_field (struct value **arg1p,
  96                         struct fn_field *f, int j,
  97                         struct type *type, int offset)
  98 {
  99   if ((current_cp_abi.virtual_fn_field) == NULL)
 100     return NULL;
 101   return (*current_cp_abi.virtual_fn_field) (arg1p, f, j,
 102                                              type, offset);
 103 }
 104
 105 struct type *
 106 value_rtti_type (struct value *v, int *full,
 107                  int *top, int *using_enc)
 108 {
 109   struct type *ret = NULL;
 110   volatile struct gdb_exception e;
 111
 112   if ((current_cp_abi.rtti_type) == NULL)
 113     return NULL;
 114   TRY_CATCH (e, RETURN_MASK_ERROR)
 115     {
 116       ret = (*current_cp_abi.rtti_type) (v, full, top, using_enc);
 117     }
 118   if (e.reason < 0)
 119     return NULL;
 120   return ret;
 121 }
 122
 123 void
 124 cplus_print_method_ptr (const gdb_byte *contents,
 125                         struct type *type,
 126                         struct ui_file *stream)
 127 {
 128   if (current_cp_abi.print_method_ptr == NULL)
 129     error (_("GDB does not support pointers to methods on this target"));
 130   (*current_cp_abi.print_method_ptr) (contents, type, stream);
 131 }
 132
 133 int
 134 cplus_method_ptr_size (struct type *to_type)
 135 {
 136   if (current_cp_abi.method_ptr_size == NULL)
 137     error (_("GDB does not support pointers to methods on this target"));
 138   return (*current_cp_abi.method_ptr_size) (to_type);
 139 }
 140
 141 void
 142 cplus_make_method_ptr (struct type *type, gdb_byte *contents,
 143                        CORE_ADDR value, int is_virtual)
 144 {
 145   if (current_cp_abi.make_method_ptr == NULL)
 146     error (_("GDB does not support pointers to methods on this target"));
 147   (*current_cp_abi.make_method_ptr) (type, contents, value, is_virtual);
 148 }
 149
 150 CORE_ADDR
 151 cplus_skip_trampoline (struct frame_info *frame,
 152                        CORE_ADDR stop_pc)
 153 {
 154   if (current_cp_abi.skip_trampoline == NULL)
 155     return 0;
 156   return (*current_cp_abi.skip_trampoline) (frame, stop_pc);
 157 }
 158
 159 struct value *
 160 cplus_method_ptr_to_value (struct value **this_p,
 161                            struct value *method_ptr)
 162 {
 163   if (current_cp_abi.method_ptr_to_value == NULL)
 164     error (_("GDB does not support pointers to methods on this target"));
 165   return (*current_cp_abi.method_ptr_to_value) (this_p, method_ptr);
 166 }
 167
 168 /* See cp-abi.h.  */
 169
 170 void
 171 cplus_print_vtable (struct value *value)
 172 {
 173   if (current_cp_abi.print_vtable == NULL)
 174     error (_("GDB cannot print the vtable on this target"));
 175   (*current_cp_abi.print_vtable) (value);
 176 }
 177
 178 /* See cp-abi.h.  */
 179
 180 struct value *
 181 cplus_typeid (struct value *value)
 182 {
 183   if (current_cp_abi.get_typeid == NULL)
 184     error (_("GDB cannot find the typeid on this target"));
 185   return (*current_cp_abi.get_typeid) (value);
 186 }
 187
 188 /* See cp-abi.h.  */
 189
 190 struct type *
 191 cplus_typeid_type (struct gdbarch *gdbarch)
 192 {
 193   if (current_cp_abi.get_typeid_type == NULL)
 194     error (_("GDB cannot find the type for 'typeid' on this target"));
 195   return (*current_cp_abi.get_typeid_type) (gdbarch);
 196 }
 197
 198 /* See cp-abi.h.  */
 199
 200 struct type *
 201 cplus_type_from_type_info (struct value *value)
 202 {
 203   if (current_cp_abi.get_type_from_type_info == NULL)
 204     error (_("GDB cannot find the type from a std::type_info on this target"));
 205   return (*current_cp_abi.get_type_from_type_info) (value);
 206 }
 207
 208 /* See cp-abi.h.  */
 209
 210 char *
 211 cplus_typename_from_type_info (struct value *value)
 212 {
 213   if (current_cp_abi.get_typename_from_type_info == NULL)
 214     error (_("GDB cannot find the type name "
 215              "from a std::type_info on this target"));
 216   return (*current_cp_abi.get_typename_from_type_info) (value);
 217 }
 218
 219 int
 220 cp_pass_by_reference (struct type *type)
 221 {
 222   if ((current_cp_abi.pass_by_reference) == NULL)
 223     return 0;
 224   return (*current_cp_abi.pass_by_reference) (type);
 225 }
 226
 227 /* Set the current C++ ABI to SHORT_NAME.  */
 228
 229 static int
 230 switch_to_cp_abi (const char *short_name)
 231 {
 232   struct cp_abi_ops *abi;
 233
 234   abi = find_cp_abi (short_name);
 235   if (abi == NULL)
 236     return 0;
 237
 238   current_cp_abi = *abi;
 239   return 1;
 240 }
 241
 242 /* Add ABI to the list of supported C++ ABI's.  */
 243
 244 int
 245 register_cp_abi (struct cp_abi_ops *abi)
 246 {
 247   if (num_cp_abis == CP_ABI_MAX)
 248     internal_error (__FILE__, __LINE__,
 249                     _("Too many C++ ABIs, please increase "
 250                       "CP_ABI_MAX in cp-abi.c"));
 251
 252   cp_abis[num_cp_abis++] = abi;
 253
 254   return 1;
 255 }
 256
 257 /* Set the ABI to use in "auto" mode to SHORT_NAME.  */
 258
 259 void
 260 set_cp_abi_as_auto_default (const char *short_name)
 261 {
 262   char *new_longname, *new_doc;
 263   struct cp_abi_ops *abi = find_cp_abi (short_name);
 264
 265   if (abi == NULL)
 266     internal_error (__FILE__, __LINE__,
 267                     _("Cannot find C++ ABI \"%s\" to set it as auto default."),
 268                     short_name);
 269
 270   if (auto_cp_abi.longname != NULL)
 271     xfree ((char *) auto_cp_abi.longname);
 272   if (auto_cp_abi.doc != NULL)
 273     xfree ((char *) auto_cp_abi.doc);
 274
 275   auto_cp_abi = *abi;
 276
 277   auto_cp_abi.shortname = "auto";
 278   new_longname = xstrprintf ("currently \"%s\"", abi->shortname);
 279   auto_cp_abi.longname = new_longname;
 280
 281   new_doc = xstrprintf ("Automatically selected; currently \"%s\"",
 282              abi->shortname);
 283   auto_cp_abi.doc = new_doc;
 284
 285   /* Since we copy the current ABI into current_cp_abi instead of
 286      using a pointer, if auto is currently the default, we need to
 287      reset it.  */
 288   if (strcmp (current_cp_abi.shortname, "auto") == 0)
 289     switch_to_cp_abi ("auto");
 290 }
 291
 292 /* Return the ABI operations associated with SHORT_NAME.  */
 293
 294 static struct cp_abi_ops *
 295 find_cp_abi (const char *short_name)
 296 {
 297   int i;
 298
 299   for (i = 0; i < num_cp_abis; i++)
 300     if (strcmp (cp_abis[i]->shortname, short_name) == 0)
 301       return cp_abis[i];
 302
 303   return NULL;
 304 }
 305
 306 /* Display the list of registered C++ ABIs.  */
 307
 308 static void
 309 list_cp_abis (int from_tty)
 310 {
 311   struct ui_out *uiout = current_uiout;
 312   struct cleanup *cleanup_chain;
 313   int i;
 314
 315   ui_out_text (uiout, "The available C++ ABIs are:\n");
 316   cleanup_chain = make_cleanup_ui_out_tuple_begin_end (uiout,
 317                                                        "cp-abi-list");
 318   for (i = 0; i < num_cp_abis; i++)
 319     {
 320       char pad[14];
 321       int padcount;
 322
 323       ui_out_text (uiout, "  ");
 324       ui_out_field_string (uiout, "cp-abi", cp_abis[i]->shortname);
 325
 326       padcount = 16 - 2 - strlen (cp_abis[i]->shortname);
 327       pad[padcount] = 0;
 328       while (padcount > 0)
 329         pad[--padcount] = ' ';
 330       ui_out_text (uiout, pad);
 331
 332       ui_out_field_string (uiout, "doc", cp_abis[i]->doc);
 333       ui_out_text (uiout, "\n");
 334     }
 335   do_cleanups (cleanup_chain);
 336 }
 337
 338 /* Set the current C++ ABI, or display the list of options if no
 339    argument is given.  */
 340
 341 static void
 342 set_cp_abi_cmd (char *args, int from_tty)
 343 {
 344   if (args == NULL)
 345     {
 346       list_cp_abis (from_tty);
 347       return;
 348     }
 349
 350   if (!switch_to_cp_abi (args))
 351     error (_("Could not find \"%s\" in ABI list"), args);
 352 }
 353
 354 /* A completion function for "set cp-abi".  */
 355
 356 static VEC (char_ptr) *
 357 cp_abi_completer (struct cmd_list_element *ignore,
 358                   const char *text, const char *word)
 359 {
 360   static const char **cp_abi_names;
 361
 362   if (cp_abi_names == NULL)
 363     {
 364       int i;
 365
 366       cp_abi_names = XNEWVEC (const char *, num_cp_abis + 1);
 367       for (i = 0; i < num_cp_abis; ++i)
 368         cp_abi_names[i] = cp_abis[i]->shortname;
 369       cp_abi_names[i] = NULL;
 370     }
 371
 372   return complete_on_enum (cp_abi_names, text, word);
 373 }
 374
 375 /* Show the currently selected C++ ABI.  */
 376
 377 static void
 378 show_cp_abi_cmd (char *args, int from_tty)
 379 {
 380   struct ui_out *uiout = current_uiout;
 381
 382   ui_out_text (uiout, "The currently selected C++ ABI is \"");
 383
 384   ui_out_field_string (uiout, "cp-abi", current_cp_abi.shortname);
 385   ui_out_text (uiout, "\" (");
 386   ui_out_field_string (uiout, "longname", current_cp_abi.longname);
 387   ui_out_text (uiout, ").\n");
 388 }
 389
 390 extern initialize_file_ftype _initialize_cp_abi; /* -Wmissing-prototypes */
 391
 392 void
 393 _initialize_cp_abi (void)
 394 {
 395   struct cmd_list_element *c;
 396
 397   register_cp_abi (&auto_cp_abi);
 398   switch_to_cp_abi ("auto");
 399
 400   c = add_cmd ("cp-abi", class_obscure, set_cp_abi_cmd, _("\
 401 Set the ABI used for inspecting C++ objects.\n\
 402 \"set cp-abi\" with no arguments will list the available ABIs."),
 403                &setlist);
 404   set_cmd_completer (c, cp_abi_completer);
 405
 406   add_cmd ("cp-abi", class_obscure, show_cp_abi_cmd,
 407            _("Show the ABI used for inspecting C++ objects."),
 408            &showlist);
 409 }