gdb/reggroups.c

   1 /* Register groupings for GDB, the GNU debugger.
   2
   3    Copyright (C) 2002-2020 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 #include "gdb_obstack.h"
  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 = XNEW (struct reggroup);
  43
  44   group->name = name;
  45   group->type = type;
  46   return group;
  47 }
  48
  49 /* See reggroups.h.  */
  50
  51 struct reggroup *
  52 reggroup_gdbarch_new (struct gdbarch *gdbarch, const char *name,
  53                       enum reggroup_type type)
  54 {
  55   struct reggroup *group = GDBARCH_OBSTACK_ZALLOC (gdbarch,
  56                                                    struct reggroup);
  57
  58   group->name = gdbarch_obstack_strdup (gdbarch, name);
  59   group->type = type;
  60   return group;
  61 }
  62
  63 /* Register group attributes.  */
  64
  65 const char *
  66 reggroup_name (struct reggroup *group)
  67 {
  68   return group->name;
  69 }
  70
  71 enum reggroup_type
  72 reggroup_type (struct reggroup *group)
  73 {
  74   return group->type;
  75 }
  76
  77 /* A linked list of groups for the given architecture.  */
  78
  79 struct reggroup_el
  80 {
  81   struct reggroup *group;
  82   struct reggroup_el *next;
  83 };
  84
  85 struct reggroups
  86 {
  87   struct reggroup_el *first;
  88   struct reggroup_el **last;
  89 };
  90
  91 static struct gdbarch_data *reggroups_data;
  92
  93 static void *
  94 reggroups_init (struct obstack *obstack)
  95 {
  96   struct reggroups *groups = OBSTACK_ZALLOC (obstack, struct reggroups);
  97
  98   groups->last = &groups->first;
  99   return groups;
 100 }
 101
 102 /* Add a register group (with attribute values) to the pre-defined
 103    list.  */
 104
 105 static void
 106 add_group (struct reggroups *groups, struct reggroup *group,
 107            struct reggroup_el *el)
 108 {
 109   gdb_assert (group != NULL);
 110   el->group = group;
 111   el->next = NULL;
 112   (*groups->last) = el;
 113   groups->last = &el->next;
 114 }
 115
 116 void
 117 reggroup_add (struct gdbarch *gdbarch, struct reggroup *group)
 118 {
 119   struct reggroups *groups
 120     = (struct reggroups *) gdbarch_data (gdbarch, reggroups_data);
 121
 122   add_group (groups, group,
 123              GDBARCH_OBSTACK_ZALLOC (gdbarch, struct reggroup_el));
 124 }
 125
 126 /* The default register groups for an architecture.  */
 127
 128 static struct reggroups default_groups = { NULL, &default_groups.first };
 129
 130 /* A register group iterator.  */
 131
 132 struct reggroup *
 133 reggroup_next (struct gdbarch *gdbarch, struct reggroup *last)
 134 {
 135   struct reggroups *groups;
 136   struct reggroup_el *el;
 137
 138   /* Don't allow this function to be called during architecture
 139      creation.  If there are no groups, use the default groups list.  */
 140   groups = (struct reggroups *) gdbarch_data (gdbarch, reggroups_data);
 141   gdb_assert (groups != NULL);
 142   if (groups->first == NULL)
 143     groups = &default_groups;
 144
 145   /* Return the first/next reggroup.  */
 146   if (last == NULL)
 147     return groups->first->group;
 148   for (el = groups->first; el != NULL; el = el->next)
 149     {
 150       if (el->group == last)
 151         {
 152           if (el->next != NULL)
 153             return el->next->group;
 154           else
 155             return NULL;
 156         }
 157     }
 158   return NULL;
 159 }
 160
 161 /* See reggroups.h.  */
 162
 163 struct reggroup *
 164 reggroup_prev (struct gdbarch *gdbarch, struct reggroup *curr)
 165 {
 166   struct reggroups *groups;
 167   struct reggroup_el *el;
 168   struct reggroup *prev;
 169
 170   /* Don't allow this function to be called during architecture
 171      creation.  If there are no groups, use the default groups list.  */
 172   groups = (struct reggroups *) gdbarch_data (gdbarch, reggroups_data);
 173   gdb_assert (groups != NULL);
 174   if (groups->first == NULL)
 175     groups = &default_groups;
 176
 177   prev = NULL;
 178   for (el = groups->first; el != NULL; el = el->next)
 179     {
 180       gdb_assert (el->group != NULL);
 181       if (el->group == curr)
 182         return prev;
 183       prev = el->group;
 184     }
 185   if (curr == NULL)
 186     return prev;
 187   return NULL;
 188 }
 189
 190 /* Is REGNUM a member of REGGROUP?  */
 191 int
 192 default_register_reggroup_p (struct gdbarch *gdbarch, int regnum,
 193                              struct reggroup *group)
 194 {
 195   int vector_p;
 196   int float_p;
 197   int raw_p;
 198
 199   if (gdbarch_register_name (gdbarch, regnum) == NULL
 200       || *gdbarch_register_name (gdbarch, regnum) == '\0')
 201     return 0;
 202   if (group == all_reggroup)
 203     return 1;
 204   vector_p = TYPE_VECTOR (register_type (gdbarch, regnum));
 205   float_p = (register_type (gdbarch, regnum)->code () == TYPE_CODE_FLT
 206              || (register_type (gdbarch, regnum)->code ()
 207                  == TYPE_CODE_DECFLOAT));
 208   raw_p = regnum < gdbarch_num_regs (gdbarch);
 209   if (group == float_reggroup)
 210     return float_p;
 211   if (group == vector_reggroup)
 212     return vector_p;
 213   if (group == general_reggroup)
 214     return (!vector_p && !float_p);
 215   if (group == save_reggroup || group == restore_reggroup)
 216     return raw_p;
 217   return 0;
 218 }
 219
 220 /* See reggroups.h.  */
 221
 222 reggroup *
 223 reggroup_find (struct gdbarch *gdbarch, const char *name)
 224 {
 225   struct reggroup *group;
 226
 227   for (group = reggroup_next (gdbarch, NULL);
 228        group != NULL;
 229        group = reggroup_next (gdbarch, group))
 230     {
 231       if (strcmp (name, reggroup_name (group)) == 0)
 232         return group;
 233     }
 234   return NULL;
 235 }
 236
 237 /* Dump out a table of register groups for the current architecture.  */
 238
 239 static void
 240 reggroups_dump (struct gdbarch *gdbarch, struct ui_file *file)
 241 {
 242   struct reggroup *group = NULL;
 243
 244   do
 245     {
 246       /* Group name.  */
 247       {
 248         const char *name;
 249
 250         if (group == NULL)
 251           name = "Group";
 252         else
 253           name = reggroup_name (group);
 254         fprintf_unfiltered (file, " %-10s", name);
 255       }
 256
 257       /* Group type.  */
 258       {
 259         const char *type;
 260
 261         if (group == NULL)
 262           type = "Type";
 263         else
 264           {
 265             switch (reggroup_type (group))
 266               {
 267               case USER_REGGROUP:
 268                 type = "user";
 269                 break;
 270               case INTERNAL_REGGROUP:
 271                 type = "internal";
 272                 break;
 273               default:
 274                 internal_error (__FILE__, __LINE__, _("bad switch"));
 275               }
 276           }
 277         fprintf_unfiltered (file, " %-10s", type);
 278       }
 279
 280       /* Note: If you change this, be sure to also update the
 281          documentation.  */
 282
 283       fprintf_unfiltered (file, "\n");
 284
 285       group = reggroup_next (gdbarch, group);
 286     }
 287   while (group != NULL);
 288 }
 289
 290 static void
 291 maintenance_print_reggroups (const char *args, int from_tty)
 292 {
 293   struct gdbarch *gdbarch = get_current_arch ();
 294
 295   if (args == NULL)
 296     reggroups_dump (gdbarch, gdb_stdout);
 297   else
 298     {
 299       stdio_file file;
 300
 301       if (!file.open (args, "w"))
 302         perror_with_name (_("maintenance print reggroups"));
 303       reggroups_dump (gdbarch, &file);
 304     }
 305 }
 306
 307 /* Pre-defined register groups.  */
 308 static struct reggroup general_group = { "general", USER_REGGROUP };
 309 static struct reggroup float_group = { "float", USER_REGGROUP };
 310 static struct reggroup system_group = { "system", USER_REGGROUP };
 311 static struct reggroup vector_group = { "vector", USER_REGGROUP };
 312 static struct reggroup all_group = { "all", USER_REGGROUP };
 313 static struct reggroup save_group = { "save", INTERNAL_REGGROUP };
 314 static struct reggroup restore_group = { "restore", INTERNAL_REGGROUP };
 315
 316 struct reggroup *const general_reggroup = &general_group;
 317 struct reggroup *const float_reggroup = &float_group;
 318 struct reggroup *const system_reggroup = &system_group;
 319 struct reggroup *const vector_reggroup = &vector_group;
 320 struct reggroup *const all_reggroup = &all_group;
 321 struct reggroup *const save_reggroup = &save_group;
 322 struct reggroup *const restore_reggroup = &restore_group;
 323
 324 void _initialize_reggroup ();
 325 void
 326 _initialize_reggroup ()
 327 {
 328   reggroups_data = gdbarch_data_register_pre_init (reggroups_init);
 329
 330   /* The pre-defined list of groups.  */
 331   add_group (&default_groups, general_reggroup, XNEW (struct reggroup_el));
 332   add_group (&default_groups, float_reggroup, XNEW (struct reggroup_el));
 333   add_group (&default_groups, system_reggroup, XNEW (struct reggroup_el));
 334   add_group (&default_groups, vector_reggroup, XNEW (struct reggroup_el));
 335   add_group (&default_groups, all_reggroup, XNEW (struct reggroup_el));
 336   add_group (&default_groups, save_reggroup, XNEW (struct reggroup_el));
 337   add_group (&default_groups, restore_reggroup, XNEW (struct reggroup_el));
 338
 339   add_cmd ("reggroups", class_maintenance,
 340            maintenance_print_reggroups, _("\
 341 Print the internal register group names.\n\
 342 Takes an optional file parameter."),
 343            &maintenanceprintlist);
 344
 345 }