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Java example source code file (BranchData.java)

This example Java source code file (BranchData.java) 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

branchdata, jumpdata, util

The BranchData.java Java example source code

/*
 * Copyright (c) 2011, 2012, 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.
 *
 */

package sun.jvm.hotspot.oops;

import java.io.*;
import java.util.*;
import sun.jvm.hotspot.debugger.*;
import sun.jvm.hotspot.runtime.*;
import sun.jvm.hotspot.types.*;
import sun.jvm.hotspot.utilities.*;

// BranchData
//
// A BranchData is used to access profiling data for a two-way branch.
// It consists of taken and notTaken counts as well as a data displacement
// for the taken case.
public class BranchData extends JumpData {

  static final int notTakenOffSet = jumpCellCount;
  static final int branchCellCount = notTakenOffSet + 1;

  public BranchData(DataLayout layout) {
    super(layout);
    //assert(layout.tag() == DataLayout.branchDataTag, "wrong type");
  }

  static int staticCellCount() {
    return branchCellCount;
  }

  public int cellCount() {
    return staticCellCount();
  }

  // Direct accessor
  int notTaken() {
    return uintAt(notTakenOffSet);
  }

  // Code generation support
  static int notTakenOffset() {
    return cellOffset(notTakenOffSet);
  }
  static int branchDataSize() {
    return cellOffset(branchCellCount);
  }

  public void printDataOn(PrintStream st) {
    printShared(st, "BranchData");
    st.println("taken(" + taken() + ") displacement(" + displacement() + ")");
    tab(st);
    st.println("not taken(" + notTaken() + ")");
  }
}

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