gdb/reggroups.c

   1 /* Register groupings for GDB, the GNU debugger.
   2
   3    Copyright (C) 2002-2013 Free Software Foundation, Inc.
   4
   5    Contributed by Red Hat.
   6
   7    This file is part of GDB.
   8
   9    This program is free software; you can redistribute it and/or modify
  10    it under the terms of the GNU General Public License as published by
  11    the Free Software Foundation; either version 3 of the License, or
  12    (at your option) any later version.
  13
  14    This program is distributed in the hope that it will be useful,
  15    but WITHOUT ANY WARRANTY; without even the implied warranty of
  16    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17    GNU General Public License for more details.
  18
  19    You should have received a copy of the GNU General Public License
  20    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
  21
  22 #include "defs.h"
  23 #include "arch-utils.h"
  24 #include "reggroups.h"
  25 #include "gdbtypes.h"
  26 #include "gdb_assert.h"
  27 #include "regcache.h"
  28 #include "command.h"
  29 #include "gdbcmd.h"             /* For maintenanceprintlist.  */
  30
  31 /* Individual register groups.  */
  32
  33 struct reggroup
  34 {
  35   const char *name;
  36   enum reggroup_type type;
  37 };
  38
  39 struct reggroup *
  40 reggroup_new (const char *name, enum reggroup_type type)
  41 {
  42   struct reggroup *group = XMALLOC (struct reggroup);
  43
  44   group->name = name;
  45   group->type = type;
  46   return group;
  47 }
  48
  49 /* Register group attributes.  */
  50
  51 const char *
  52 reggroup_name (struct reggroup *group)
  53 {
  54   return group->name;
  55 }
  56
  57 enum reggroup_type
  58 reggroup_type (struct reggroup *group)
  59 {
  60   return group->type;
  61 }
  62
  63 /* A linked list of groups for the given architecture.  */
  64
  65 struct reggroup_el
  66 {
  67   struct reggroup *group;
  68   struct reggroup_el *next;
  69 };
  70
  71 struct reggroups
  72 {
  73   struct reggroup_el *first;
  74   struct reggroup_el **last;
  75 };
  76
  77 static struct gdbarch_data *reggroups_data;
  78
  79 static void *
  80 reggroups_init (struct gdbarch *gdbarch)
  81 {
  82   struct reggroups *groups = GDBARCH_OBSTACK_ZALLOC (gdbarch,
  83                                                      struct reggroups);
  84
  85   groups->last = &groups->first;
  86   return groups;
  87 }
  88
  89 /* Add a register group (with attribute values) to the pre-defined
  90    list.  */
  91
  92 static void
  93 add_group (struct reggroups *groups, struct reggroup *group,
  94            struct reggroup_el *el)
  95 {
  96   gdb_assert (group != NULL);
  97   el->group = group;
  98   el->next = NULL;
  99   (*groups->last) = el;
 100   groups->last = &el->next;
 101 }
 102
 103 void
 104 reggroup_add (struct gdbarch *gdbarch, struct reggroup *group)
 105 {
 106   struct reggroups *groups = gdbarch_data (gdbarch, reggroups_data);
 107
 108   if (groups == NULL)
 109     {
 110       /* ULGH, called during architecture initialization.  Patch
 111          things up.  */
 112       groups = reggroups_init (gdbarch);
 113       deprecated_set_gdbarch_data (gdbarch, reggroups_data, groups);
 114     }
 115   add_group (groups, group,
 116              GDBARCH_OBSTACK_ZALLOC (gdbarch, struct reggroup_el));
 117 }
 118
 119 /* The default register groups for an architecture.  */
 120
 121 static struct reggroups default_groups = { NULL, &default_groups.first };
 122
 123 /* A register group iterator.  */
 124
 125 struct reggroup *
 126 reggroup_next (struct gdbarch *gdbarch, struct reggroup *last)
 127 {
 128   struct reggroups *groups;
 129   struct reggroup_el *el;
 130
 131   /* Don't allow this function to be called during architecture
 132      creation.  If there are no groups, use the default groups list.  */
 133   groups = gdbarch_data (gdbarch, reggroups_data);
 134   gdb_assert (groups != NULL);
 135   if (groups->first == NULL)
 136     groups = &default_groups;
 137
 138   /* Return the first/next reggroup.  */
 139   if (last == NULL)
 140     return groups->first->group;
 141   for (el = groups->first; el != NULL; el = el->next)
 142     {
 143       if (el->group == last)
 144         {
 145           if (el->next != NULL)
 146             return el->next->group;
 147           else
 148             return NULL;
 149         }
 150     }
 151   return NULL;
 152 }
 153
 154 /* Is REGNUM a member of REGGROUP?  */
 155 int
 156 default_register_reggroup_p (struct gdbarch *gdbarch, int regnum,
 157                              struct reggroup *group)
 158 {
 159   int vector_p;
 160   int float_p;
 161   int raw_p;
 162
 163   if (gdbarch_register_name (gdbarch, regnum) == NULL
 164       || *gdbarch_register_name (gdbarch, regnum) == '\0')
 165     return 0;
 166   if (group == all_reggroup)
 167     return 1;
 168   vector_p = TYPE_VECTOR (register_type (gdbarch, regnum));
 169   float_p = TYPE_CODE (register_type (gdbarch, regnum)) == TYPE_CODE_FLT;
 170   raw_p = regnum < gdbarch_num_regs (gdbarch);
 171   if (group == float_reggroup)
 172     return float_p;
 173   if (group == vector_reggroup)
 174     return vector_p;
 175   if (group == general_reggroup)
 176     return (!vector_p && !float_p);
 177   if (group == save_reggroup || group == restore_reggroup)
 178     return raw_p;
 179   return 0;
 180 }
 181
 182 /* Dump out a table of register groups for the current architecture.  */
 183
 184 static void
 185 reggroups_dump (struct gdbarch *gdbarch, struct ui_file *file)
 186 {
 187   struct reggroup *group = NULL;
 188
 189   do
 190     {
 191       /* Group name.  */
 192       {
 193         const char *name;
 194
 195         if (group == NULL)
 196           name = "Group";
 197         else
 198           name = reggroup_name (group);
 199         fprintf_unfiltered (file, " %-10s", name);
 200       }
 201
 202       /* Group type.  */
 203       {
 204         const char *type;
 205
 206         if (group == NULL)
 207           type = "Type";
 208         else
 209           {
 210             switch (reggroup_type (group))
 211               {
 212               case USER_REGGROUP:
 213                 type = "user";
 214                 break;
 215               case INTERNAL_REGGROUP:
 216                 type = "internal";
 217                 break;
 218               default:
 219                 internal_error (__FILE__, __LINE__, _("bad switch"));
 220               }
 221           }
 222         fprintf_unfiltered (file, " %-10s", type);
 223       }
 224
 225       /* Note: If you change this, be sure to also update the
 226          documentation.  */
 227
 228       fprintf_unfiltered (file, "\n");
 229
 230       group = reggroup_next (gdbarch, group);
 231     }
 232   while (group != NULL);
 233 }
 234
 235 static void
 236 maintenance_print_reggroups (char *args, int from_tty)
 237 {
 238   struct gdbarch *gdbarch = get_current_arch ();
 239
 240   if (args == NULL)
 241     reggroups_dump (gdbarch, gdb_stdout);
 242   else
 243     {
 244       struct cleanup *cleanups;
 245       struct ui_file *file = gdb_fopen (args, "w");
 246
 247       if (file == NULL)
 248         perror_with_name (_("maintenance print reggroups"));
 249       cleanups = make_cleanup_ui_file_delete (file);
 250       reggroups_dump (gdbarch, file);
 251       do_cleanups (cleanups);
 252     }
 253 }
 254
 255 /* Pre-defined register groups.  */
 256 static struct reggroup general_group = { "general", USER_REGGROUP };
 257 static struct reggroup float_group = { "float", USER_REGGROUP };
 258 static struct reggroup system_group = { "system", USER_REGGROUP };
 259 static struct reggroup vector_group = { "vector", USER_REGGROUP };
 260 static struct reggroup all_group = { "all", USER_REGGROUP };
 261 static struct reggroup save_group = { "save", INTERNAL_REGGROUP };
 262 static struct reggroup restore_group = { "restore", INTERNAL_REGGROUP };
 263
 264 struct reggroup *const general_reggroup = &general_group;
 265 struct reggroup *const float_reggroup = &float_group;
 266 struct reggroup *const system_reggroup = &system_group;
 267 struct reggroup *const vector_reggroup = &vector_group;
 268 struct reggroup *const all_reggroup = &all_group;
 269 struct reggroup *const save_reggroup = &save_group;
 270 struct reggroup *const restore_reggroup = &restore_group;
 271
 272 extern initialize_file_ftype _initialize_reggroup; /* -Wmissing-prototypes */
 273
 274 void
 275 _initialize_reggroup (void)
 276 {
 277   reggroups_data = gdbarch_data_register_post_init (reggroups_init);
 278
 279   /* The pre-defined list of groups.  */
 280   add_group (&default_groups, general_reggroup, XMALLOC (struct reggroup_el));
 281   add_group (&default_groups, float_reggroup, XMALLOC (struct reggroup_el));
 282   add_group (&default_groups, system_reggroup, XMALLOC (struct reggroup_el));
 283   add_group (&default_groups, vector_reggroup, XMALLOC (struct reggroup_el));
 284   add_group (&default_groups, all_reggroup, XMALLOC (struct reggroup_el));
 285   add_group (&default_groups, save_reggroup, XMALLOC (struct reggroup_el));
 286   add_group (&default_groups, restore_reggroup, XMALLOC (struct reggroup_el));
 287
 288   add_cmd ("reggroups", class_maintenance,
 289            maintenance_print_reggroups, _("\
 290 Print the internal register group names.\n\
 291 Takes an optional file parameter."),
 292            &maintenanceprintlist);
 293
 294 }