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Java example source code file (ProfileData.java)

This example Java source code file (ProfileData.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

address, bytearrayoutputstream, datalayout, printstream, profiledata, string, util

The ProfileData.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.*;

public abstract class ProfileData {
  // This is a pointer to a section of profiling data.
  private DataLayout _data;

  public DataLayout data() { return _data; }

  // How many cells are in this?
  public abstract int cellCount();


  // Return the size of this data.
  public int sizeInBytes() {
    return DataLayout.computeSizeInBytes(cellCount());
  }

  public int dp() {
    return data().dp();
  }

  // Low-level accessors for underlying data
  int intptrAt(int index) {
    //assert(0 <= index && index < cellCount(), "oob");
    return data().cellAt(index);
  }
  int intAt(int index) {
    return (int)intptrAt(index);
  }
  int uintAt(int index) {
    return (int)intptrAt(index);
  }
  public Address addressAt(int index) {
    return data().addressAt(index);
  }

  boolean flagAt(int flagNumber) {
    return data().flagAt(flagNumber);
  }

  // two convenient imports for use by subclasses:
  public static int cellOffset(int index) {
    return DataLayout.cellOffset(index);
  }

  public ProfileData(DataLayout data) {
    _data = data;
  }

  // Constructor for invalid ProfileData.
  ProfileData() {
    _data = null;
  }

  int bci() {
    return data().bci();
  }

  int trapState() {
    return data().trapState();
  }
  public abstract void printDataOn(PrintStream st);

  void tab(PrintStream st) {
    st.print("\t");
  }

  void printShared(PrintStream st, String name) {
    st.print("bci: " + bci());
    // st.fillTo(tabWidthOne);
    st.print(" " +  name + " ");
    tab(st);
    int trap = trapState();
    if (trap != 0) {
      st.print("trap(" + MethodData.formatTrapState(trap) + ") ");
    }
    int flags = data().flags();
    if (flags != 0)
      st.print("flags(" + flags + ") ");
  }

  public String toString() {
    ByteArrayOutputStream baos = new ByteArrayOutputStream();
    PrintStream ps = new PrintStream(baos);
    try {
      printDataOn(ps);
    } finally {
      ps.close();
    }
    return baos.toString();
  }
}

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