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/* Builtin frame register, 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 "frame.h"

#include "gdbtypes.h"

#include "value.h"

#include "gdb_string.h"

/* Types that describe the various builtin registers.  */

static struct type *builtin_type_frame_reg;

/* Constructors for those types.  */

static void

build_builtin_type_frame_reg (void)

{

  /* $frame.  */

  if (builtin_type_frame_reg == NULL)

    {

#if 0

      struct frame

      {

        void *base;

      };

#endif

      builtin_type_frame_reg = init_composite_type ("frame", TYPE_CODE_STRUCT);

      append_composite_type_field (builtin_type_frame_reg, "base",

                                   builtin_type_void_data_ptr);

    }

}

static struct value *

value_of_builtin_frame_reg (struct frame_info *frame)

{

  struct value *val;

  char *buf;

  build_builtin_type_frame_reg ();

  val = allocate_value (builtin_type_frame_reg);

  VALUE_LVAL (val) = not_lval;

  buf = VALUE_CONTENTS_RAW (val);

  memset (buf, TYPE_LENGTH (VALUE_TYPE (val)), 0);

  /* frame.base.  */

  if (frame != NULL)

    ADDRESS_TO_POINTER (builtin_type_void_data_ptr, buf, frame->frame);

  buf += TYPE_LENGTH (builtin_type_void_data_ptr);

  /* frame.XXX.  */

  return val;

}

static struct value *

value_of_builtin_frame_fp_reg (struct frame_info *frame)

{

#ifdef FP_REGNUM

  if (FP_REGNUM >= 0)

    return value_of_register (FP_REGNUM, frame);

#endif

  {

    struct value *val = allocate_value (builtin_type_void_data_ptr);

    char *buf = VALUE_CONTENTS_RAW (val);

    if (frame == NULL)

      memset (buf, TYPE_LENGTH (VALUE_TYPE (val)), 0);

    else

      ADDRESS_TO_POINTER (builtin_type_void_data_ptr, buf, frame->frame);

    return val;

  }

}

static struct value *

value_of_builtin_frame_pc_reg (struct frame_info *frame)

{

#ifdef PC_REGNUM

  if (PC_REGNUM >= 0)

    return value_of_register (PC_REGNUM, frame);

#endif

  {

    struct value *val = allocate_value (builtin_type_void_data_ptr);

    char *buf = VALUE_CONTENTS_RAW (val);

    if (frame == NULL)

      memset (buf, TYPE_LENGTH (VALUE_TYPE (val)), 0);

    else

      ADDRESS_TO_POINTER (builtin_type_void_data_ptr, buf, frame->pc);

    return val;

  }

}

static struct value *

value_of_builtin_frame_sp_reg (struct frame_info *frame)

{

#ifdef SP_REGNUM

  if (SP_REGNUM >= 0)

    return value_of_register (SP_REGNUM, frame);

#endif

  error ("Standard register ``$sp'' is not available for this target");

}

static struct value *

value_of_builtin_frame_ps_reg (struct frame_info *frame)

{

#ifdef PS_REGNUM

  if (PS_REGNUM >= 0)

    return value_of_register (PS_REGNUM, frame);

#endif

  error ("Standard register ``$ps'' is not available for this target");

}

void

_initialize_frame_reg (void)

{

  /* FIXME: cagney/2002-02-08: At present the local builtin types

     can't be initialized using _initialize*() or gdbarch.  Due mainly

     to non-multi-arch targets, GDB initializes things piece meal and,

     as a consequence can leave these types NULL.  */

  REGISTER_GDBARCH_SWAP (builtin_type_frame_reg);

  /* Frame based $fp, $pc, $sp and $ps.  These only come into play

     when the target does not define its own version of these

     registers.  */

  add_builtin_reg ("fp", value_of_builtin_frame_fp_reg);

  add_builtin_reg ("pc", value_of_builtin_frame_pc_reg);

  add_builtin_reg ("sp", value_of_builtin_frame_sp_reg);

  add_builtin_reg ("ps", value_of_builtin_frame_ps_reg);

  /* NOTE: cagney/2002-04-05: For moment leave the $frame / $gdbframe

     / $gdb.frame disabled.  It isn't yet clear which of the many

     options is the best.  */

  if (0)

    add_builtin_reg ("frame", value_of_builtin_frame_reg);

}