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/* Builtin registers, for GDB, the GNU debugger.

   Copyright 2002 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 2 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, write to the Free Software

   Foundation, Inc., 59 Temple Place - Suite 330,

   Boston, MA 02111-1307, USA.  */

#include "defs.h"

#include "builtin-regs.h"

#include "gdbtypes.h"

#include "gdb_string.h"

#include "gdb_assert.h"

/* Implement builtin register types.  Builtin registers have regnum's

   that live above of the range [0 .. NUM_REGS + NUM_PSEUDO_REGS)

   (which is controlled by the target).  The target should never see a

   builtin register's regnum value.  */

/* An array of builtin registers.  Always append, never delete.  By

   doing this, the relative regnum (offset from NUM_REGS +

   NUM_PSEUDO_REGS) assigned to each builtin register never changes.  */

struct builtin_reg

{

  const char *name;

  struct value *(*value) (struct frame_info * frame);

};

static struct builtin_reg *builtin_regs;

int nr_builtin_regs;

void

add_builtin_reg (const char *name, struct value *(*value) (struct frame_info * frame))

{

  nr_builtin_regs++;

  builtin_regs = xrealloc (builtin_regs,

                           nr_builtin_regs * sizeof (builtin_regs[0]));

  builtin_regs[nr_builtin_regs - 1].name = name;

  builtin_regs[nr_builtin_regs - 1].value = value;

}

int

builtin_reg_map_name_to_regnum (const char *name, int len)

{

  int reg;

  for (reg = 0; reg < nr_builtin_regs; reg++)

    {

      if (len == strlen (builtin_regs[reg].name)

          && strncmp (builtin_regs[reg].name, name, len) == 0)

        return NUM_REGS + NUM_PSEUDO_REGS + reg;

    }

  return -1;

}

const char *

builtin_reg_map_regnum_to_name (int regnum)

{

  int reg = regnum - (NUM_REGS + NUM_PSEUDO_REGS);

  if (reg < 0 || reg >= nr_builtin_regs)

    return NULL;

  return builtin_regs[reg].name;

}

struct value *

value_of_builtin_reg (int regnum, struct frame_info *frame)

{

  int reg = regnum - (NUM_REGS + NUM_PSEUDO_REGS);

  gdb_assert (reg >= 0 && reg < nr_builtin_regs);

  return builtin_regs[reg].value (frame);

}