/*
* Copyright (c) 1997, 2008, 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. Oracle designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
* 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.
*/
/*
* The Original Code is HAT. The Initial Developer of the
* Original Code is Bill Foote, with contributions from others
* at JavaSoft/Sun.
*/
package com.sun.tools.hat.internal.model;
import com.sun.tools.hat.internal.util.Misc;
/**
*
* @author Bill Foote
*/
/**
* Represents a member of the rootset, that is, one of the objects that
* the GC starts from when marking reachable objects.
*/
public class Root {
private long id; // ID of the JavaThing we refer to
private long refererId; // Thread or Class responsible for this, or 0
private int index = -1; // Index in Snapshot.roots
private int type;
private String description;
private JavaHeapObject referer = null;
private StackTrace stackTrace = null;
// Values for type. Higher values are more interesting -- see getType().
// See also getTypeName()
public final static int INVALID_TYPE = 0;
public final static int UNKNOWN = 1;
public final static int SYSTEM_CLASS = 2;
public final static int NATIVE_LOCAL = 3;
public final static int NATIVE_STATIC = 4;
public final static int THREAD_BLOCK = 5;
public final static int BUSY_MONITOR = 6;
public final static int JAVA_LOCAL = 7;
public final static int NATIVE_STACK = 8;
public final static int JAVA_STATIC = 9;
public Root(long id, long refererId, int type, String description) {
this(id, refererId, type, description, null);
}
public Root(long id, long refererId, int type, String description,
StackTrace stackTrace) {
this.id = id;
this.refererId = refererId;
this.type = type;
this.description = description;
this.stackTrace = stackTrace;
}
public long getId() {
return id;
}
public String getIdString() {
return Misc.toHex(id);
}
public String getDescription() {
if ("".equals(description)) {
return getTypeName() + " Reference";
} else {
return description;
}
}
/**
* Return type. We guarantee that more interesting roots will have
* a type that is numerically higher.
*/
public int getType() {
return type;
}
public String getTypeName() {
switch(type) {
case INVALID_TYPE: return "Invalid (?!?)";
case UNKNOWN: return "Unknown";
case SYSTEM_CLASS: return "System Class";
case NATIVE_LOCAL: return "JNI Local";
case NATIVE_STATIC: return "JNI Global";
case THREAD_BLOCK: return "Thread Block";
case BUSY_MONITOR: return "Busy Monitor";
case JAVA_LOCAL: return "Java Local";
case NATIVE_STACK: return "Native Stack (possibly Java local)";
case JAVA_STATIC: return "Java Static";
default: return "??";
}
}
/**
* Given two Root instances, return the one that is most interesting.
*/
public Root mostInteresting(Root other) {
if (other.type > this.type) {
return other;
} else {
return this;
}
}
/**
* Get the object that's responsible for this root, if there is one.
* This will be null, a Thread object, or a Class object.
*/
public JavaHeapObject getReferer() {
return referer;
}
/**
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