gdb/cp-abi.c

   1 /* Generic code for supporting multiple C++ ABI's
   2    Copyright 2001, 2002, 2003 Free Software Foundation, Inc.
   3
   4    This file is part of GDB.
   5
   6    This program is free software; you can redistribute it and/or modify
   7    it under the terms of the GNU General Public License as published by
   8    the Free Software Foundation; either version 2 of the License, or
   9    (at your option) any later version.
  10
  11    This program is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14    GNU General Public License for more details.
  15
  16    You should have received a copy of the GNU General Public License
  17    along with this program; if not, write to the Free Software
  18    Foundation, Inc., 59 Temple Place - Suite 330,
  19    Boston, MA 02111-1307, USA.  */
  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, char *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 /* Set the current C++ ABI to SHORT_NAME.  */
  98
  99 static int
 100 switch_to_cp_abi (const char *short_name)
 101 {
 102   struct cp_abi_ops *abi;
 103
 104   abi = find_cp_abi (short_name);
 105   if (abi == NULL)
 106     return 0;
 107
 108   current_cp_abi = *abi;
 109   return 1;
 110 }
 111
 112 /* Add ABI to the list of supported C++ ABI's.  */
 113
 114 int
 115 register_cp_abi (struct cp_abi_ops *abi)
 116 {
 117   if (num_cp_abis == CP_ABI_MAX)
 118     internal_error (__FILE__, __LINE__,
 119                     "Too many C++ ABIs, please increase CP_ABI_MAX in cp-abi.c");
 120
 121   cp_abis[num_cp_abis++] = abi;
 122
 123   return 1;
 124 }
 125
 126 /* Set the ABI to use in "auto" mode to SHORT_NAME.  */
 127
 128 void
 129 set_cp_abi_as_auto_default (const char *short_name)
 130 {
 131   char *new_longname, *new_doc;
 132   struct cp_abi_ops *abi = find_cp_abi (short_name);
 133
 134   if (abi == NULL)
 135     internal_error (__FILE__, __LINE__,
 136                     "Cannot find C++ ABI \"%s\" to set it as auto default.",
 137                     short_name);
 138
 139   if (auto_cp_abi.longname != NULL)
 140     xfree ((char *) auto_cp_abi.longname);
 141   if (auto_cp_abi.doc != NULL)
 142     xfree ((char *) auto_cp_abi.doc);
 143
 144   auto_cp_abi = *abi;
 145
 146   auto_cp_abi.shortname = "auto";
 147   new_longname = xmalloc (strlen ("currently ") + 1 + strlen (abi->shortname)
 148                           + 1 + 1);
 149   sprintf (new_longname, "currently \"%s\"", abi->shortname);
 150   auto_cp_abi.longname = new_longname;
 151
 152   new_doc = xmalloc (strlen ("Automatically selected; currently ")
 153                      + 1 + strlen (abi->shortname) + 1 + 1);
 154   sprintf (new_doc, "Automatically selected; currently \"%s\"", abi->shortname);
 155   auto_cp_abi.doc = new_doc;
 156
 157   /* Since we copy the current ABI into current_cp_abi instead of
 158      using a pointer, if auto is currently the default, we need to
 159      reset it.  */
 160   if (strcmp (current_cp_abi.shortname, "auto") == 0)
 161     switch_to_cp_abi ("auto");
 162 }
 163
 164 /* Return the ABI operations associated with SHORT_NAME.  */
 165
 166 static struct cp_abi_ops *
 167 find_cp_abi (const char *short_name)
 168 {
 169   int i;
 170
 171   for (i = 0; i < num_cp_abis; i++)
 172     if (strcmp (cp_abis[i]->shortname, short_name) == 0)
 173       return cp_abis[i];
 174
 175   return NULL;
 176 }
 177
 178 /* Display the list of registered C++ ABIs.  */
 179
 180 static void
 181 list_cp_abis (int from_tty)
 182 {
 183   struct cleanup *cleanup_chain;
 184   int i;
 185   ui_out_text (uiout, "The available C++ ABIs are:\n");
 186
 187   cleanup_chain = make_cleanup_ui_out_tuple_begin_end (uiout, "cp-abi-list");
 188   for (i = 0; i < num_cp_abis; i++)
 189     {
 190       char pad[14];
 191       int padcount;
 192
 193       ui_out_text (uiout, "  ");
 194       ui_out_field_string (uiout, "cp-abi", cp_abis[i]->shortname);
 195
 196       padcount = 16 - 2 - strlen (cp_abis[i]->shortname);
 197       pad[padcount] = 0;
 198       while (padcount > 0)
 199         pad[--padcount] = ' ';
 200       ui_out_text (uiout, pad);
 201
 202       ui_out_field_string (uiout, "doc", cp_abis[i]->doc);
 203       ui_out_text (uiout, "\n");
 204     }
 205   do_cleanups (cleanup_chain);
 206 }
 207
 208 /* Set the current C++ ABI, or display the list of options if no
 209    argument is given.  */
 210
 211 static void
 212 set_cp_abi_cmd (char *args, int from_tty)
 213 {
 214   if (args == NULL)
 215     {
 216       list_cp_abis (from_tty);
 217       return;
 218     }
 219
 220   if (!switch_to_cp_abi (args))
 221     error ("Could not find \"%s\" in ABI list", args);
 222 }
 223
 224 /* Show the currently selected C++ ABI.  */
 225
 226 static void
 227 show_cp_abi_cmd (char *args, int from_tty)
 228 {
 229   ui_out_text (uiout, "The currently selected C++ ABI is \"");
 230
 231   ui_out_field_string (uiout, "cp-abi", current_cp_abi.shortname);
 232   ui_out_text (uiout, "\" (");
 233   ui_out_field_string (uiout, "longname", current_cp_abi.longname);
 234   ui_out_text (uiout, ").\n");
 235 }
 236
 237 extern initialize_file_ftype _initialize_cp_abi; /* -Wmissing-prototypes */
 238
 239 void
 240 _initialize_cp_abi (void)
 241 {
 242   register_cp_abi (&auto_cp_abi);
 243   switch_to_cp_abi ("auto");
 244
 245   add_cmd ("cp-abi", class_obscure, set_cp_abi_cmd,
 246            "Set the ABI used for inspecting C++ objects.\n"
 247            "\"set cp-abi\" with no arguments will list the available ABIs.",
 248            &setlist);
 249
 250   add_cmd ("cp-abi", class_obscure, show_cp_abi_cmd,
 251            "Show the ABI used for inspecting C++ objects.", &showlist);
 252 }