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Java example source code file (rootnode.hpp)

This example Java source code file (rootnode.hpp) is included in the alvinalexander.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Learn more about this Java project at its project page.

Java - Java tags/keywords

cfg, haltnode, ideal, identity, loopnode, no_hash, node, notamachinereg, opcode, phasetransform, share_vm_opto_rootnode_hpp, type, type\:\:bottom, value

The rootnode.hpp Java example source code

/*
 * 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

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