/* Register groupings for GDB, the GNU debugger.

   Copyright (C) 2002, 2003, 2007, 2008 Free Software Foundation, Inc.

   Contributed by Red Hat.

   This file is part of GDB.

   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 3 of the License, or
   (at your option) any later version.

   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */

#include "defs.h"
#include "reggroups.h"
#include "gdbtypes.h"
#include "gdb_assert.h"
#include "regcache.h"
#include "command.h"
#include "gdbcmd.h"		/* For maintenanceprintlist.  */

/* Individual register groups.  */

struct reggroup
{
  const char *name;
  enum reggroup_type type;
};

struct reggroup *
reggroup_new (const char *name, enum reggroup_type type)
{
  struct reggroup *group = XMALLOC (struct reggroup);
  group->name = name;
  group->type = type;
  return group;
}

/* Register group attributes.  */

const char *
reggroup_name (struct reggroup *group)
{
  return group->name;
}

enum reggroup_type
reggroup_type (struct reggroup *group)
{
  return group->type;
}

/* A linked list of groups for the given architecture.  */

struct reggroup_el
{
  struct reggroup *group;
  struct reggroup_el *next;
};

struct reggroups
{
  struct reggroup_el *first;
  struct reggroup_el **last;
};

static struct gdbarch_data *reggroups_data;

static void *
reggroups_init (struct gdbarch *gdbarch)
{
  struct reggroups *groups = GDBARCH_OBSTACK_ZALLOC (gdbarch,
						     struct reggroups);
  groups->last = &groups->first;
  return groups;
}

/* Add a register group (with attribute values) to the pre-defined
   list.  */

static void
add_group (struct reggroups *groups, struct reggroup *group,
	   struct reggroup_el *el)
{
  gdb_assert (group != NULL);
  el->group = group;
  el->next = NULL;
  (*groups->last) = el;
  groups->last = &el->next;
}

void
reggroup_add (struct gdbarch *gdbarch, struct reggroup *group)
{
  struct reggroups *groups = gdbarch_data (gdbarch, reggroups_data);

  if (groups == NULL)
    {
      /* ULGH, called during architecture initialization.  Patch
         things up.  */
      groups = reggroups_init (gdbarch);
      deprecated_set_gdbarch_data (gdbarch, reggroups_data, groups);
    }
  add_group (groups, group,
	     GDBARCH_OBSTACK_ZALLOC (gdbarch, struct reggroup_el));
}

/* The default register groups for an architecture.  */

static struct reggroups default_groups = { NULL, &default_groups.first };

/* A register group iterator.  */

struct reggroup *
reggroup_next (struct gdbarch *gdbarch, struct reggroup *last)
{
  struct reggroups *groups;
  struct reggroup_el *el;

  /* Don't allow this function to be called during architecture
     creation.  If there are no groups, use the default groups list.  */
  groups = gdbarch_data (gdbarch, reggroups_data);
  gdb_assert (groups != NULL);
  if (groups->first == NULL)
    groups = &default_groups;

  /* Return the first/next reggroup.  */
  if (last == NULL)
    return groups->first->group;
  for (el = groups->first; el != NULL; el = el->next)
    {
      if (el->group == last)
	{
	  if (el->next != NULL)
	    return el->next->group;
	  else
	    return NULL;
	}
    }
  return NULL;
}

/* Is REGNUM a member of REGGROUP?  */
int
default_register_reggroup_p (struct gdbarch *gdbarch, int regnum,
			     struct reggroup *group)
{
  int vector_p;
  int float_p;
  int raw_p;

  if (gdbarch_register_name (gdbarch, regnum) == NULL
      || *gdbarch_register_name (gdbarch, regnum) == '\0')
    return 0;
  if (group == all_reggroup)
    return 1;
  vector_p = TYPE_VECTOR (register_type (gdbarch, regnum));
  float_p = TYPE_CODE (register_type (gdbarch, regnum)) == TYPE_CODE_FLT;
  raw_p = regnum < gdbarch_num_regs (gdbarch);
  if (group == float_reggroup)
    return float_p;
  if (group == vector_reggroup)
    return vector_p;
  if (group == general_reggroup)
    return (!vector_p && !float_p);
  if (group == save_reggroup || group == restore_reggroup)
    return raw_p;
  return 0;   
}

/* Dump out a table of register groups for the current architecture.  */

static void
reggroups_dump (struct gdbarch *gdbarch, struct ui_file *file)
{
  struct reggroup *group = NULL;

  do
    {
      /* Group name.  */
      {
	const char *name;
	if (group == NULL)
	  name = "Group";
	else
	  name = reggroup_name (group);
	fprintf_unfiltered (file, " %-10s", name);
      }
      
      /* Group type.  */
      {
	const char *type;
	if (group == NULL)
	  type = "Type";
	else
	  {
	    switch (reggroup_type (group))
	      {
	      case USER_REGGROUP:
		type = "user";
		break;
	      case INTERNAL_REGGROUP:
		type = "internal";
		break;
	      default:
		internal_error (__FILE__, __LINE__, _("bad switch"));
	      }
	  }
	fprintf_unfiltered (file, " %-10s", type);
      }

      /* Note: If you change this, be sure to also update the
         documentation.  */
      
      fprintf_unfiltered (file, "\n");

      group = reggroup_next (gdbarch, group);
    }
  while (group != NULL);
}

static void
maintenance_print_reggroups (char *args, int from_tty)
{
  if (args == NULL)
    reggroups_dump (current_gdbarch, gdb_stdout);
  else
    {
      struct ui_file *file = gdb_fopen (args, "w");
      if (file == NULL)
	perror_with_name (_("maintenance print reggroups"));
      reggroups_dump (current_gdbarch, file);    
      ui_file_delete (file);
    }
}

/* Pre-defined register groups.  */
static struct reggroup general_group = { "general", USER_REGGROUP };
static struct reggroup float_group = { "float", USER_REGGROUP };
static struct reggroup system_group = { "system", USER_REGGROUP };
static struct reggroup vector_group = { "vector", USER_REGGROUP };
static struct reggroup all_group = { "all", USER_REGGROUP };
static struct reggroup save_group = { "save", INTERNAL_REGGROUP };
static struct reggroup restore_group = { "restore", INTERNAL_REGGROUP };

struct reggroup *const general_reggroup = &general_group;
struct reggroup *const float_reggroup = &float_group;
struct reggroup *const system_reggroup = &system_group;
struct reggroup *const vector_reggroup = &vector_group;
struct reggroup *const all_reggroup = &all_group;
struct reggroup *const save_reggroup = &save_group;
struct reggroup *const restore_reggroup = &restore_group;

extern initialize_file_ftype _initialize_reggroup; /* -Wmissing-prototypes */

void
_initialize_reggroup (void)
{
  reggroups_data = gdbarch_data_register_post_init (reggroups_init);

  /* The pre-defined list of groups.  */
  add_group (&default_groups, general_reggroup, XMALLOC (struct reggroup_el));
  add_group (&default_groups, float_reggroup, XMALLOC (struct reggroup_el));
  add_group (&default_groups, system_reggroup, XMALLOC (struct reggroup_el));
  add_group (&default_groups, vector_reggroup, XMALLOC (struct reggroup_el));
  add_group (&default_groups, all_reggroup, XMALLOC (struct reggroup_el));
  add_group (&default_groups, save_reggroup, XMALLOC (struct reggroup_el));
  add_group (&default_groups, restore_reggroup, XMALLOC (struct reggroup_el));

  add_cmd ("reggroups", class_maintenance,
	   maintenance_print_reggroups, _("\
Print the internal register group names.\n\
Takes an optional file parameter."),
	   &maintenanceprintlist);

}