gdb/reggroups.c

   1 /* Register groupings for GDB, the GNU debugger.
   2
   3    Copyright (C) 2002-2022 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 "gdbsupport/gdb_obstack.h"
  30
  31 /* See reggroups.h.  */
  32
  33 const reggroup *
  34 reggroup_new (const char *name, enum reggroup_type type)
  35 {
  36   return new reggroup (name, type);
  37 }
  38
  39 /* See reggroups.h.  */
  40
  41 const reggroup *
  42 reggroup_gdbarch_new (struct gdbarch *gdbarch, const char *name,
  43                       enum reggroup_type type)
  44 {
  45   name = gdbarch_obstack_strdup (gdbarch, name);
  46   return obstack_new<struct reggroup> (gdbarch_obstack (gdbarch),
  47                                        name, type);
  48 }
  49
  50 /* A container holding all the register groups for a particular
  51    architecture.  */
  52
  53 struct reggroups
  54 {
  55   reggroups ()
  56   {
  57     /* Add the default groups.  */
  58     add (general_reggroup);
  59     add (float_reggroup);
  60     add (system_reggroup);
  61     add (vector_reggroup);
  62     add (all_reggroup);
  63     add (save_reggroup);
  64     add (restore_reggroup);
  65   }
  66
  67   DISABLE_COPY_AND_ASSIGN (reggroups);
  68
  69   /* Add GROUP to the list of register groups.  */
  70
  71   void add (const reggroup *group)
  72   {
  73     gdb_assert (group != nullptr);
  74
  75     auto find_by_name = [group] (const reggroup *g)
  76       {
  77         return streq (group->name (), g->name ());
  78       };
  79     gdb_assert (std::find_if (m_groups.begin (), m_groups.end (), find_by_name)
  80                 == m_groups.end ());
  81
  82     m_groups.push_back (group);
  83   }
  84
  85   /* The number of register groups.  */
  86
  87   std::vector<struct reggroup *>::size_type
  88   size () const
  89   {
  90     return m_groups.size ();
  91   }
  92
  93   /* Return a reference to the list of all groups.  */
  94
  95   const std::vector<const struct reggroup *> &
  96   groups () const
  97   {
  98     return m_groups;
  99   }
 100
 101 private:
 102   /* The register groups.  */
 103   std::vector<const struct reggroup *> m_groups;
 104 };
 105
 106 /* Key used to lookup register group data from a gdbarch.  */
 107
 108 static const registry<gdbarch>::key<reggroups> reggroups_data;
 109
 110 /* Get the reggroups for the architecture, creating if necessary.  */
 111
 112 static reggroups *
 113 get_reggroups (struct gdbarch *gdbarch)
 114 {
 115   struct reggroups *groups = reggroups_data.get (gdbarch);
 116   if (groups == nullptr)
 117     groups = reggroups_data.emplace (gdbarch);
 118   return groups;
 119 }
 120
 121 /* See reggroups.h.  */
 122
 123 void
 124 reggroup_add (struct gdbarch *gdbarch, const reggroup *group)
 125 {
 126   struct reggroups *groups = get_reggroups (gdbarch);
 127
 128   gdb_assert (groups != nullptr);
 129   gdb_assert (group != nullptr);
 130
 131   groups->add (group);
 132 }
 133
 134 /* See reggroups.h.  */
 135 const std::vector<const reggroup *> &
 136 gdbarch_reggroups (struct gdbarch *gdbarch)
 137 {
 138   struct reggroups *groups = get_reggroups (gdbarch);
 139   gdb_assert (groups != nullptr);
 140   gdb_assert (groups->size () > 0);
 141   return groups->groups ();
 142 }
 143
 144 /* See reggroups.h.  */
 145
 146 int
 147 default_register_reggroup_p (struct gdbarch *gdbarch, int regnum,
 148                              const struct reggroup *group)
 149 {
 150   int vector_p;
 151   int float_p;
 152   int raw_p;
 153
 154   if (*gdbarch_register_name (gdbarch, regnum) == '\0')
 155     return 0;
 156   if (group == all_reggroup)
 157     return 1;
 158   vector_p = register_type (gdbarch, regnum)->is_vector ();
 159   float_p = (register_type (gdbarch, regnum)->code () == TYPE_CODE_FLT
 160              || (register_type (gdbarch, regnum)->code ()
 161                  == TYPE_CODE_DECFLOAT));
 162   raw_p = regnum < gdbarch_num_regs (gdbarch);
 163   if (group == float_reggroup)
 164     return float_p;
 165   if (group == vector_reggroup)
 166     return vector_p;
 167   if (group == general_reggroup)
 168     return (!vector_p && !float_p);
 169   if (group == save_reggroup || group == restore_reggroup)
 170     return raw_p;
 171   return 0;
 172 }
 173
 174 /* See reggroups.h.  */
 175
 176 const reggroup *
 177 reggroup_find (struct gdbarch *gdbarch, const char *name)
 178 {
 179   for (const struct reggroup *group : gdbarch_reggroups (gdbarch))
 180     {
 181       if (strcmp (name, group->name ()) == 0)
 182         return group;
 183     }
 184   return NULL;
 185 }
 186
 187 /* Dump out a table of register groups for the current architecture.  */
 188
 189 static void
 190 reggroups_dump (struct gdbarch *gdbarch, struct ui_file *file)
 191 {
 192   static constexpr const char *fmt = " %-10s %-10s\n";
 193
 194   gdb_printf (file, fmt, "Group", "Type");
 195
 196   for (const struct reggroup *group : gdbarch_reggroups (gdbarch))
 197     {
 198       /* Group name.  */
 199       const char *name = group->name ();
 200
 201       /* Group type.  */
 202       const char *type;
 203
 204       switch (group->type ())
 205         {
 206         case USER_REGGROUP:
 207           type = "user";
 208           break;
 209         case INTERNAL_REGGROUP:
 210           type = "internal";
 211           break;
 212         default:
 213           internal_error (_("bad switch"));
 214         }
 215
 216       /* Note: If you change this, be sure to also update the
 217          documentation.  */
 218
 219       gdb_printf (file, fmt, name, type);
 220     }
 221 }
 222
 223 /* Implement 'maintenance print reggroups' command.  */
 224
 225 static void
 226 maintenance_print_reggroups (const char *args, int from_tty)
 227 {
 228   struct gdbarch *gdbarch = get_current_arch ();
 229
 230   if (args == NULL)
 231     reggroups_dump (gdbarch, gdb_stdout);
 232   else
 233     {
 234       stdio_file file;
 235
 236       if (!file.open (args, "w"))
 237         perror_with_name (_("maintenance print reggroups"));
 238       reggroups_dump (gdbarch, &file);
 239     }
 240 }
 241
 242 /* Pre-defined register groups.  */
 243 static const reggroup general_group = { "general", USER_REGGROUP };
 244 static const reggroup float_group = { "float", USER_REGGROUP };
 245 static const reggroup system_group = { "system", USER_REGGROUP };
 246 static const reggroup vector_group = { "vector", USER_REGGROUP };
 247 static const reggroup all_group = { "all", USER_REGGROUP };
 248 static const reggroup save_group = { "save", INTERNAL_REGGROUP };
 249 static const reggroup restore_group = { "restore", INTERNAL_REGGROUP };
 250
 251 const reggroup *const general_reggroup = &general_group;
 252 const reggroup *const float_reggroup = &float_group;
 253 const reggroup *const system_reggroup = &system_group;
 254 const reggroup *const vector_reggroup = &vector_group;
 255 const reggroup *const all_reggroup = &all_group;
 256 const reggroup *const save_reggroup = &save_group;
 257 const reggroup *const restore_reggroup = &restore_group;
 258
 259 void _initialize_reggroup ();
 260 void
 261 _initialize_reggroup ()
 262 {
 263   add_cmd ("reggroups", class_maintenance,
 264            maintenance_print_reggroups, _("\
 265 Print the internal register group names.\n\
 266 Takes an optional file parameter."),
 267            &maintenanceprintlist);
 268
 269 }