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/* Convert language-specific tree expression to rtl instructions,

   for GNU compiler.

   Copyright (C) 1988, 1992, 1993, 1994, 1995, 1996, 1997, 1998,

   2000, 2001, 2002, 2003, 2004, 2007 Free Software Foundation, Inc.

This file is part of GCC.

GCC 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, or (at your option)

any later version.

GCC 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 GCC; see the file COPYING3.  If not see

<http://www.gnu.org/licenses/>.  */

#include "config.h"

#include "system.h"

#include "coretypes.h"

#include "tm.h"

#include "rtl.h"

#include "tree.h"

#include "flags.h"

#include "expr.h"

#include "cp-tree.h"

#include "toplev.h"

#include "except.h"

#include "tm_p.h"

/* Expand C++-specific constants.  Currently, this means PTRMEM_CST.  */

tree

cplus_expand_constant (tree cst)

{

  switch (TREE_CODE (cst))

    {

    case PTRMEM_CST:

      {

        tree type = TREE_TYPE (cst);

        tree member;

        /* Find the member.  */

        member = PTRMEM_CST_MEMBER (cst);

        if (TREE_CODE (member) == FIELD_DECL)

          {

            /* Find the offset for the field.  */

            cst = byte_position (member);

            while (!same_type_p (DECL_CONTEXT (member),

                                 TYPE_PTRMEM_CLASS_TYPE (type)))

              {

                /* The MEMBER must have been nestled within an

                   anonymous aggregate contained in TYPE.  Find the

                   anonymous aggregate.  */

                member = lookup_anon_field (TYPE_PTRMEM_CLASS_TYPE (type),

                                            DECL_CONTEXT (member));

                cst = size_binop (PLUS_EXPR, cst, byte_position (member));

              }

            cst = fold (build_nop (type, cst));

          }

        else

          {

            tree delta;

            tree pfn;

            expand_ptrmemfunc_cst (cst, &delta, &pfn);

            cst = build_ptrmemfunc1 (type, delta, pfn);

          }

      }

      break;

    default:

      /* There's nothing to do.  */

      break;

    }

  return cst;

}