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Java example source code file (multnode.hpp)

This example Java source code file (multnode.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, matcher, multinode, no_hash, node, notamachinereg, opcode, phasetransform, product, projnode, regmask, share_vm_opto_multnode_hpp, type, typeptr

The multnode.hpp Java example source code

/*
 * Copyright (c) 1997, 2013, 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_MULTNODE_HPP
#define SHARE_VM_OPTO_MULTNODE_HPP

#include "opto/node.hpp"

class Matcher;
class ProjNode;

//------------------------------MultiNode--------------------------------------
// This class defines a MultiNode, a Node which produces many values.  The
// values are wrapped up in a tuple Type, i.e. a TypeTuple.
class MultiNode : public Node {
public:
  MultiNode( uint required ) : Node(required) {
    init_class_id(Class_Multi);
  }
  virtual int Opcode() const;
  virtual const Type *bottom_type() const = 0;
  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 RegMask &out_RegMask() const;
  virtual Node *match( const ProjNode *proj, const Matcher *m );
  virtual uint ideal_reg() const { return NotAMachineReg; }
  ProjNode* proj_out(uint which_proj) const; // Get a named projection

};

//------------------------------ProjNode---------------------------------------
// This class defines a Projection node.  Projections project a single element
// out of a tuple (or Signature) type.  Only MultiNodes produce TypeTuple
// results.
class ProjNode : public Node {
protected:
  virtual uint hash() const;
  virtual uint cmp( const Node &n ) const;
  virtual uint size_of() const;
  void check_con() const;       // Called from constructor.
  const Type* proj_type(const Type* t) const;

public:
  ProjNode( Node *src, uint con, bool io_use = false )
    : Node( src ), _con(con), _is_io_use(io_use)
  {
    init_class_id(Class_Proj);
    // Optimistic setting. Need additional checks in Node::is_dead_loop_safe().
    if (con != TypeFunc::Memory || src->is_Start())
      init_flags(Flag_is_dead_loop_safe);
    debug_only(check_con());
  }
  const uint _con;              // The field in the tuple we are projecting
  const bool _is_io_use;        // Used to distinguish between the projections
                                // used on the control and io paths from a macro node
  virtual int Opcode() const;
  virtual bool      is_CFG() const;
  virtual bool depends_only_on_test() const { return false; }
  virtual const Type *bottom_type() const;
  virtual const TypePtr *adr_type() const;
  virtual bool pinned() const;
  virtual const Type *Value( PhaseTransform *phase ) const;
  virtual uint ideal_reg() const;
  virtual const RegMask &out_RegMask() const;

#ifndef PRODUCT
  virtual void dump_spec(outputStream *st) const;
#endif

  // Return true if proj is for "proj->[region->..]call_uct"
  bool is_uncommon_trap_proj(Deoptimization::DeoptReason reason);
  // Return true for    "if(test)-> proj -> ...
  //                          |
  //                          V
  //                      other_proj->[region->..]call_uct"
  bool is_uncommon_trap_if_pattern(Deoptimization::DeoptReason reason);
};

#endif // SHARE_VM_OPTO_MULTNODE_HPP

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