gdb/reggroups.c

   1 /* Register groupings for GDB, the GNU debugger.
   2
   3    Copyright (C) 2002-2015 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 "regcache.h"
  27 #include "command.h"
  28 #include "gdbcmd.h"             /* For maintenanceprintlist.  */
  29
  30 /* Individual register groups.  */
  31
  32 struct reggroup
  33 {
  34   const char *name;
  35   enum reggroup_type type;
  36 };
  37
  38 struct reggroup *
  39 reggroup_new (const char *name, enum reggroup_type type)
  40 {
  41   struct reggroup *group = XNEW (struct reggroup);
  42
  43   group->name = name;
  44   group->type = type;
  45   return group;
  46 }
  47
  48 /* Register group attributes.  */
  49
  50 const char *
  51 reggroup_name (struct reggroup *group)
  52 {
  53   return group->name;
  54 }
  55
  56 enum reggroup_type
  57 reggroup_type (struct reggroup *group)
  58 {
  59   return group->type;
  60 }
  61
  62 /* A linked list of groups for the given architecture.  */
  63
  64 struct reggroup_el
  65 {
  66   struct reggroup *group;
  67   struct reggroup_el *next;
  68 };
  69
  70 struct reggroups
  71 {
  72   struct reggroup_el *first;
  73   struct reggroup_el **last;
  74 };
  75
  76 static struct gdbarch_data *reggroups_data;
  77
  78 static void *
  79 reggroups_init (struct gdbarch *gdbarch)
  80 {
  81   struct reggroups *groups = GDBARCH_OBSTACK_ZALLOC (gdbarch,
  82                                                      struct reggroups);
  83
  84   groups->last = &groups->first;
  85   return groups;
  86 }
  87
  88 /* Add a register group (with attribute values) to the pre-defined
  89    list.  */
  90
  91 static void
  92 add_group (struct reggroups *groups, struct reggroup *group,
  93            struct reggroup_el *el)
  94 {
  95   gdb_assert (group != NULL);
  96   el->group = group;
  97   el->next = NULL;
  98   (*groups->last) = el;
  99   groups->last = &el->next;
 100 }
 101
 102 void
 103 reggroup_add (struct gdbarch *gdbarch, struct reggroup *group)
 104 {
 105   struct reggroups *groups = gdbarch_data (gdbarch, reggroups_data);
 106
 107   if (groups == NULL)
 108     {
 109       /* ULGH, called during architecture initialization.  Patch
 110          things up.  */
 111       groups = reggroups_init (gdbarch);
 112       deprecated_set_gdbarch_data (gdbarch, reggroups_data, groups);
 113     }
 114   add_group (groups, group,
 115              GDBARCH_OBSTACK_ZALLOC (gdbarch, struct reggroup_el));
 116 }
 117
 118 /* The default register groups for an architecture.  */
 119
 120 static struct reggroups default_groups = { NULL, &default_groups.first };
 121
 122 /* A register group iterator.  */
 123
 124 struct reggroup *
 125 reggroup_next (struct gdbarch *gdbarch, struct reggroup *last)
 126 {
 127   struct reggroups *groups;
 128   struct reggroup_el *el;
 129
 130   /* Don't allow this function to be called during architecture
 131      creation.  If there are no groups, use the default groups list.  */
 132   groups = gdbarch_data (gdbarch, reggroups_data);
 133   gdb_assert (groups != NULL);
 134   if (groups->first == NULL)
 135     groups = &default_groups;
 136
 137   /* Return the first/next reggroup.  */
 138   if (last == NULL)
 139     return groups->first->group;
 140   for (el = groups->first; el != NULL; el = el->next)
 141     {
 142       if (el->group == last)
 143         {
 144           if (el->next != NULL)
 145             return el->next->group;
 146           else
 147             return NULL;
 148         }
 149     }
 150   return NULL;
 151 }
 152
 153 /* See reggroups.h.  */
 154
 155 struct reggroup *
 156 reggroup_prev (struct gdbarch *gdbarch, struct reggroup *curr)
 157 {
 158   struct reggroups *groups;
 159   struct reggroup_el *el;
 160   struct reggroup *prev;
 161
 162   /* Don't allow this function to be called during architecture
 163      creation.  If there are no groups, use the default groups list.  */
 164   groups = gdbarch_data (gdbarch, reggroups_data);
 165   gdb_assert (groups != NULL);
 166   if (groups->first == NULL)
 167     groups = &default_groups;
 168
 169   prev = NULL;
 170   for (el = groups->first; el != NULL; el = el->next)
 171     {
 172       gdb_assert (el->group != NULL);
 173       if (el->group == curr)
 174         return prev;
 175       prev = el->group;
 176     }
 177   if (curr == NULL)
 178     return prev;
 179   return NULL;
 180 }
 181
 182 /* Is REGNUM a member of REGGROUP?  */
 183 int
 184 default_register_reggroup_p (struct gdbarch *gdbarch, int regnum,
 185                              struct reggroup *group)
 186 {
 187   int vector_p;
 188   int float_p;
 189   int raw_p;
 190
 191   if (gdbarch_register_name (gdbarch, regnum) == NULL
 192       || *gdbarch_register_name (gdbarch, regnum) == '\0')
 193     return 0;
 194   if (group == all_reggroup)
 195     return 1;
 196   vector_p = TYPE_VECTOR (register_type (gdbarch, regnum));
 197   float_p = TYPE_CODE (register_type (gdbarch, regnum)) == TYPE_CODE_FLT;
 198   raw_p = regnum < gdbarch_num_regs (gdbarch);
 199   if (group == float_reggroup)
 200     return float_p;
 201   if (group == vector_reggroup)
 202     return vector_p;
 203   if (group == general_reggroup)
 204     return (!vector_p && !float_p);
 205   if (group == save_reggroup || group == restore_reggroup)
 206     return raw_p;
 207   return 0;
 208 }
 209
 210 /* Dump out a table of register groups for the current architecture.  */
 211
 212 static void
 213 reggroups_dump (struct gdbarch *gdbarch, struct ui_file *file)
 214 {
 215   struct reggroup *group = NULL;
 216
 217   do
 218     {
 219       /* Group name.  */
 220       {
 221         const char *name;
 222
 223         if (group == NULL)
 224           name = "Group";
 225         else
 226           name = reggroup_name (group);
 227         fprintf_unfiltered (file, " %-10s", name);
 228       }
 229
 230       /* Group type.  */
 231       {
 232         const char *type;
 233
 234         if (group == NULL)
 235           type = "Type";
 236         else
 237           {
 238             switch (reggroup_type (group))
 239               {
 240               case USER_REGGROUP:
 241                 type = "user";
 242                 break;
 243               case INTERNAL_REGGROUP:
 244                 type = "internal";
 245                 break;
 246               default:
 247                 internal_error (__FILE__, __LINE__, _("bad switch"));
 248               }
 249           }
 250         fprintf_unfiltered (file, " %-10s", type);
 251       }
 252
 253       /* Note: If you change this, be sure to also update the
 254          documentation.  */
 255
 256       fprintf_unfiltered (file, "\n");
 257
 258       group = reggroup_next (gdbarch, group);
 259     }
 260   while (group != NULL);
 261 }
 262
 263 static void
 264 maintenance_print_reggroups (char *args, int from_tty)
 265 {
 266   struct gdbarch *gdbarch = get_current_arch ();
 267
 268   if (args == NULL)
 269     reggroups_dump (gdbarch, gdb_stdout);
 270   else
 271     {
 272       struct cleanup *cleanups;
 273       struct ui_file *file = gdb_fopen (args, "w");
 274
 275       if (file == NULL)
 276         perror_with_name (_("maintenance print reggroups"));
 277       cleanups = make_cleanup_ui_file_delete (file);
 278       reggroups_dump (gdbarch, file);
 279       do_cleanups (cleanups);
 280     }
 281 }
 282
 283 /* Pre-defined register groups.  */
 284 static struct reggroup general_group = { "general", USER_REGGROUP };
 285 static struct reggroup float_group = { "float", USER_REGGROUP };
 286 static struct reggroup system_group = { "system", USER_REGGROUP };
 287 static struct reggroup vector_group = { "vector", USER_REGGROUP };
 288 static struct reggroup all_group = { "all", USER_REGGROUP };
 289 static struct reggroup save_group = { "save", INTERNAL_REGGROUP };
 290 static struct reggroup restore_group = { "restore", INTERNAL_REGGROUP };
 291
 292 struct reggroup *const general_reggroup = &general_group;
 293 struct reggroup *const float_reggroup = &float_group;
 294 struct reggroup *const system_reggroup = &system_group;
 295 struct reggroup *const vector_reggroup = &vector_group;
 296 struct reggroup *const all_reggroup = &all_group;
 297 struct reggroup *const save_reggroup = &save_group;
 298 struct reggroup *const restore_reggroup = &restore_group;
 299
 300 extern initialize_file_ftype _initialize_reggroup; /* -Wmissing-prototypes */
 301
 302 void
 303 _initialize_reggroup (void)
 304 {
 305   reggroups_data = gdbarch_data_register_post_init (reggroups_init);
 306
 307   /* The pre-defined list of groups.  */
 308   add_group (&default_groups, general_reggroup, XNEW (struct reggroup_el));
 309   add_group (&default_groups, float_reggroup, XNEW (struct reggroup_el));
 310   add_group (&default_groups, system_reggroup, XNEW (struct reggroup_el));
 311   add_group (&default_groups, vector_reggroup, XNEW (struct reggroup_el));
 312   add_group (&default_groups, all_reggroup, XNEW (struct reggroup_el));
 313   add_group (&default_groups, save_reggroup, XNEW (struct reggroup_el));
 314   add_group (&default_groups, restore_reggroup, XNEW (struct reggroup_el));
 315
 316   add_cmd ("reggroups", class_maintenance,
 317            maintenance_print_reggroups, _("\
 318 Print the internal register group names.\n\
 319 Takes an optional file parameter."),
 320            &maintenanceprintlist);
 321
 322 }