gdb/cp-abi.c

   1 /* Generic code for supporting multiple C++ ABI's
   2
   3    Copyright (C) 2001, 2002, 2003, 2005, 2006, 2007, 2008
   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 "gdbcmd.h"
  26 #include "ui-out.h"
  27
  28 #include "gdb_string.h"
  29
  30 static struct cp_abi_ops *find_cp_abi (const char *short_name);
  31
  32 static struct cp_abi_ops current_cp_abi = { "", NULL };
  33 static struct cp_abi_ops auto_cp_abi = { "auto", NULL };
  34
  35 #define CP_ABI_MAX 8
  36 static struct cp_abi_ops *cp_abis[CP_ABI_MAX];
  37 static int num_cp_abis = 0;
  38
  39 enum ctor_kinds
  40 is_constructor_name (const char *name)
  41 {
  42   if ((current_cp_abi.is_constructor_name) == NULL)
  43     error (_("ABI doesn't define required function is_constructor_name"));
  44   return (*current_cp_abi.is_constructor_name) (name);
  45 }
  46
  47 enum dtor_kinds
  48 is_destructor_name (const char *name)
  49 {
  50   if ((current_cp_abi.is_destructor_name) == NULL)
  51     error (_("ABI doesn't define required function is_destructor_name"));
  52   return (*current_cp_abi.is_destructor_name) (name);
  53 }
  54
  55 int
  56 is_vtable_name (const char *name)
  57 {
  58   if ((current_cp_abi.is_vtable_name) == NULL)
  59     error (_("ABI doesn't define required function is_vtable_name"));
  60   return (*current_cp_abi.is_vtable_name) (name);
  61 }
  62
  63 int
  64 is_operator_name (const char *name)
  65 {
  66   if ((current_cp_abi.is_operator_name) == NULL)
  67     error (_("ABI doesn't define required function is_operator_name"));
  68   return (*current_cp_abi.is_operator_name) (name);
  69 }
  70
  71 int
  72 baseclass_offset (struct type *type, int index, const bfd_byte *valaddr,
  73                   CORE_ADDR address)
  74 {
  75   if (current_cp_abi.baseclass_offset == NULL)
  76     error (_("ABI doesn't define required function baseclass_offset"));
  77   return (*current_cp_abi.baseclass_offset) (type, index, valaddr, address);
  78 }
  79
  80 struct value *
  81 value_virtual_fn_field (struct value **arg1p, struct fn_field *f, int j,
  82                         struct type *type, int offset)
  83 {
  84   if ((current_cp_abi.virtual_fn_field) == NULL)
  85     return NULL;
  86   return (*current_cp_abi.virtual_fn_field) (arg1p, f, j, type, offset);
  87 }
  88
  89 struct type *
  90 value_rtti_type (struct value *v, int *full, int *top, int *using_enc)
  91 {
  92   if ((current_cp_abi.rtti_type) == NULL)
  93     return NULL;
  94   return (*current_cp_abi.rtti_type) (v, full, top, using_enc);
  95 }
  96
  97 void
  98 cplus_print_method_ptr (const gdb_byte *contents, struct type *type,
  99                         struct ui_file *stream)
 100 {
 101   if (current_cp_abi.print_method_ptr == NULL)
 102     error (_("GDB does not support pointers to methods on this target"));
 103   (*current_cp_abi.print_method_ptr) (contents, type, stream);
 104 }
 105
 106 int
 107 cplus_method_ptr_size (void)
 108 {
 109   if (current_cp_abi.method_ptr_size == NULL)
 110     error (_("GDB does not support pointers to methods on this target"));
 111   return (*current_cp_abi.method_ptr_size) ();
 112 }
 113
 114 void
 115 cplus_make_method_ptr (gdb_byte *contents, CORE_ADDR value, int is_virtual)
 116 {
 117   if (current_cp_abi.make_method_ptr == NULL)
 118     error (_("GDB does not support pointers to methods on this target"));
 119   (*current_cp_abi.make_method_ptr) (contents, value, is_virtual);
 120 }
 121
 122 CORE_ADDR
 123 cplus_skip_trampoline (struct frame_info *frame, CORE_ADDR stop_pc)
 124 {
 125   if (current_cp_abi.skip_trampoline == NULL)
 126     return 0;
 127   return (*current_cp_abi.skip_trampoline) (frame, stop_pc);
 128 }
 129
 130 struct value *
 131 cplus_method_ptr_to_value (struct value **this_p, struct value *method_ptr)
 132 {
 133   if (current_cp_abi.method_ptr_to_value == NULL)
 134     error (_("GDB does not support pointers to methods on this target"));
 135   return (*current_cp_abi.method_ptr_to_value) (this_p, method_ptr);
 136 }
 137
 138 int
 139 cp_pass_by_reference (struct type *type)
 140 {
 141   if ((current_cp_abi.pass_by_reference) == NULL)
 142     return 0;
 143   return (*current_cp_abi.pass_by_reference) (type);
 144 }
 145
 146 /* Set the current C++ ABI to SHORT_NAME.  */
 147
 148 static int
 149 switch_to_cp_abi (const char *short_name)
 150 {
 151   struct cp_abi_ops *abi;
 152
 153   abi = find_cp_abi (short_name);
 154   if (abi == NULL)
 155     return 0;
 156
 157   current_cp_abi = *abi;
 158   return 1;
 159 }
 160
 161 /* Add ABI to the list of supported C++ ABI's.  */
 162
 163 int
 164 register_cp_abi (struct cp_abi_ops *abi)
 165 {
 166   if (num_cp_abis == CP_ABI_MAX)
 167     internal_error (__FILE__, __LINE__,
 168                     _("Too many C++ ABIs, please increase CP_ABI_MAX in cp-abi.c"));
 169
 170   cp_abis[num_cp_abis++] = abi;
 171
 172   return 1;
 173 }
 174
 175 /* Set the ABI to use in "auto" mode to SHORT_NAME.  */
 176
 177 void
 178 set_cp_abi_as_auto_default (const char *short_name)
 179 {
 180   char *new_longname, *new_doc;
 181   struct cp_abi_ops *abi = find_cp_abi (short_name);
 182
 183   if (abi == NULL)
 184     internal_error (__FILE__, __LINE__,
 185                     _("Cannot find C++ ABI \"%s\" to set it as auto default."),
 186                     short_name);
 187
 188   if (auto_cp_abi.longname != NULL)
 189     xfree ((char *) auto_cp_abi.longname);
 190   if (auto_cp_abi.doc != NULL)
 191     xfree ((char *) auto_cp_abi.doc);
 192
 193   auto_cp_abi = *abi;
 194
 195   auto_cp_abi.shortname = "auto";
 196   new_longname = xstrprintf ("currently \"%s\"", abi->shortname);
 197   auto_cp_abi.longname = new_longname;
 198
 199   new_doc = xstrprintf ("Automatically selected; currently \"%s\"",
 200              abi->shortname);
 201   auto_cp_abi.doc = new_doc;
 202
 203   /* Since we copy the current ABI into current_cp_abi instead of
 204      using a pointer, if auto is currently the default, we need to
 205      reset it.  */
 206   if (strcmp (current_cp_abi.shortname, "auto") == 0)
 207     switch_to_cp_abi ("auto");
 208 }
 209
 210 /* Return the ABI operations associated with SHORT_NAME.  */
 211
 212 static struct cp_abi_ops *
 213 find_cp_abi (const char *short_name)
 214 {
 215   int i;
 216
 217   for (i = 0; i < num_cp_abis; i++)
 218     if (strcmp (cp_abis[i]->shortname, short_name) == 0)
 219       return cp_abis[i];
 220
 221   return NULL;
 222 }
 223
 224 /* Display the list of registered C++ ABIs.  */
 225
 226 static void
 227 list_cp_abis (int from_tty)
 228 {
 229   struct cleanup *cleanup_chain;
 230   int i;
 231   ui_out_text (uiout, "The available C++ ABIs are:\n");
 232
 233   cleanup_chain = make_cleanup_ui_out_tuple_begin_end (uiout, "cp-abi-list");
 234   for (i = 0; i < num_cp_abis; i++)
 235     {
 236       char pad[14];
 237       int padcount;
 238
 239       ui_out_text (uiout, "  ");
 240       ui_out_field_string (uiout, "cp-abi", cp_abis[i]->shortname);
 241
 242       padcount = 16 - 2 - strlen (cp_abis[i]->shortname);
 243       pad[padcount] = 0;
 244       while (padcount > 0)
 245         pad[--padcount] = ' ';
 246       ui_out_text (uiout, pad);
 247
 248       ui_out_field_string (uiout, "doc", cp_abis[i]->doc);
 249       ui_out_text (uiout, "\n");
 250     }
 251   do_cleanups (cleanup_chain);
 252 }
 253
 254 /* Set the current C++ ABI, or display the list of options if no
 255    argument is given.  */
 256
 257 static void
 258 set_cp_abi_cmd (char *args, int from_tty)
 259 {
 260   if (args == NULL)
 261     {
 262       list_cp_abis (from_tty);
 263       return;
 264     }
 265
 266   if (!switch_to_cp_abi (args))
 267     error (_("Could not find \"%s\" in ABI list"), args);
 268 }
 269
 270 /* Show the currently selected C++ ABI.  */
 271
 272 static void
 273 show_cp_abi_cmd (char *args, int from_tty)
 274 {
 275   ui_out_text (uiout, "The currently selected C++ ABI is \"");
 276
 277   ui_out_field_string (uiout, "cp-abi", current_cp_abi.shortname);
 278   ui_out_text (uiout, "\" (");
 279   ui_out_field_string (uiout, "longname", current_cp_abi.longname);
 280   ui_out_text (uiout, ").\n");
 281 }
 282
 283 extern initialize_file_ftype _initialize_cp_abi; /* -Wmissing-prototypes */
 284
 285 void
 286 _initialize_cp_abi (void)
 287 {
 288   register_cp_abi (&auto_cp_abi);
 289   switch_to_cp_abi ("auto");
 290
 291   add_cmd ("cp-abi", class_obscure, set_cp_abi_cmd, _("\
 292 Set the ABI used for inspecting C++ objects.\n\
 293 \"set cp-abi\" with no arguments will list the available ABIs."),
 294            &setlist);
 295
 296   add_cmd ("cp-abi", class_obscure, show_cp_abi_cmd,
 297            _("Show the ABI used for inspecting C++ objects."), &showlist);
 298 }