alvinalexander.com | career | drupal | java | mac | mysql | perl | scala | uml | unix  

Java example source code file (ScopeValue.java)

This example Java source code file (ScopeValue.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

constant_double_code, constant_int_code, constant_long_code, constant_object_code, constant_object_id_code, constant_oop_code, constantdoublevalue, constantintvalue, constantlongvalue, constantoopreadvalue, location_code, locationvalue, scopevalue

The ScopeValue.java Java example source code

/*
 * Copyright (c) 2000, 2009, 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.code;

import java.io.*;

import sun.jvm.hotspot.utilities.*;

/** <P> Classes used for serializing debugging information. These
    abstractions are introducted to provide symmetric read and write
    operations. </P>

    <P>
    <UL>
    <LI> ScopeValue: describes the value of a variable/expression in a scope
    <UL>
    <LI> LocationValue: describes a value in a given location (in frame or register)
    <LI> ConstantValue: describes a constant
    </UL>
    </UL>
    </P> */

public abstract class ScopeValue {
  // Package private enumeration values (FIXME: read from target VM)
  static final int LOCATION_CODE        = 0;
  static final int CONSTANT_INT_CODE    = 1;
  static final int CONSTANT_OOP_CODE    = 2;
  static final int CONSTANT_LONG_CODE   = 3;
  static final int CONSTANT_DOUBLE_CODE = 4;
  static final int CONSTANT_OBJECT_CODE = 5;
  static final int CONSTANT_OBJECT_ID_CODE = 6;

  public boolean isLocation()       { return false; }
  public boolean isConstantInt()    { return false; }
  public boolean isConstantDouble() { return false; }
  public boolean isConstantLong()   { return false; }
  public boolean isConstantOop()    { return false; }
  public boolean isObject()         { return false; }

  public static ScopeValue readFrom(DebugInfoReadStream stream) {
    switch (stream.readInt()) {
    case LOCATION_CODE:
      return new LocationValue(stream);
    case CONSTANT_INT_CODE:
      return new ConstantIntValue(stream);
    case CONSTANT_OOP_CODE:
      return new ConstantOopReadValue(stream);
    case CONSTANT_LONG_CODE:
      return new ConstantLongValue(stream);
    case CONSTANT_DOUBLE_CODE:
      return new ConstantDoubleValue(stream);
    case CONSTANT_OBJECT_CODE:
      return stream.readObjectValue();
    case CONSTANT_OBJECT_ID_CODE:
      return stream.getCachedObject();
    default:
      Assert.that(false, "should not reach here");
      return null;
    }
  }

  public abstract void printOn(PrintStream tty);
}

Other Java examples (source code examples)

Here is a short list of links related to this Java ScopeValue.java source code file:

... this post is sponsored by my books ...

#1 New Release!

FP Best Seller

 

new blog posts

 

Copyright 1998-2021 Alvin Alexander, alvinalexander.com
All Rights Reserved.

A percentage of advertising revenue from
pages under the /java/jwarehouse URI on this website is
paid back to open source projects.