/*

 * Copyright (c) 1997, 2010, Oracle and/or its affiliates. All rights reserved.

 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

 *

 * This code is free software; you can redistribute it and/or modify it

 * under the terms of the GNU General Public License version 2 only, as

 * published by the Free Software Foundation.

 *

 * This code 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

 * version 2 for more details (a copy is included in the LICENSE file that

 * accompanied this code).

 *

 * You should have received a copy of the GNU General Public License version

 * 2 along with this work; if not, write to the Free Software Foundation,

 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

 *

 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

 * or visit www.oracle.com if you need additional information or have any

 * questions.

 *

 */

#ifndef SHARE_VM_OPTO_ROOTNODE_HPP

#define SHARE_VM_OPTO_ROOTNODE_HPP

#include "opto/loopnode.hpp"

//------------------------------RootNode---------------------------------------

// The one-and-only before-all-else and after-all-else RootNode.  The RootNode

// represents what happens if the user runs the whole program repeatedly.  The

// RootNode produces the initial values of I/O and memory for the program or

// procedure start.

class RootNode : public LoopNode {

public:

  RootNode( ) : LoopNode(0,0) {

    init_class_id(Class_Root);

    del_req(2);

    del_req(1);

  }

  virtual int   Opcode() const;

  virtual const Node *is_block_proj() const { return this; }

  virtual const Type *bottom_type() const { return Type::BOTTOM; }

  virtual Node *Identity( PhaseTransform *phase ) { return this; }

  virtual Node *Ideal(PhaseGVN *phase, bool can_reshape);

  virtual const Type *Value( PhaseTransform *phase ) const { return Type::BOTTOM; }

};

//------------------------------HaltNode---------------------------------------

// Throw an exception & die

class HaltNode : public Node {

public:

  HaltNode( Node *ctrl, Node *frameptr );

  virtual int Opcode() const;

  virtual bool  pinned() const { return true; };

  virtual Node *Ideal(PhaseGVN *phase, bool can_reshape);

  virtual const Type *Value( PhaseTransform *phase ) const;

  virtual const Type *bottom_type() const;

  virtual bool  is_CFG() const { return true; }

  virtual uint hash() const { return NO_HASH; }  // CFG nodes do not hash

  virtual bool depends_only_on_test() const { return false; }

  virtual const Node *is_block_proj() const { return this; }

  virtual const RegMask &out_RegMask() const;

  virtual uint ideal_reg() const { return NotAMachineReg; }

  virtual uint match_edge(uint idx) const { return 0; }

};

#endif // SHARE_VM_OPTO_ROOTNODE_HPP