hotspot/agent/src/share/classes/sun/jvm/hotspot/oops/MethodData.java

/*
 * Copyright 2000-2004 Sun Microsystems, Inc.  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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
 * CA 95054 USA or visit www.sun.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.*;

// A MethodData provides interpreter profiling information

public class MethodData extends Oop {
  static {
    VM.registerVMInitializedObserver(new Observer() {
        public void update(Observable o, Object data) {
          initialize(VM.getVM().getTypeDataBase());
        }
      });
  }

  private static synchronized void initialize(TypeDataBase db) throws WrongTypeException {
    Type type      = db.lookupType("methodDataOopDesc");
    baseOffset     = type.getSize();

    size           = new CIntField(type.getCIntegerField("_size"), 0);
    method         = new OopField(type.getOopField("_method"), 0);
    // FIXME: add more fields and accessors
  }

  MethodData(OopHandle handle, ObjectHeap heap) {
    super(handle, heap);
  }

  public boolean isMethodData()        { return true; }

  private static long baseOffset;
  private static CIntField size;
  private static OopField  method;

  public long getObjectSize() {
    return alignObjectSize(size.getValue(this));
  }

  public Method getMethod() {
    return (Method) method.getValue(this);
  }

  public void printValueOn(PrintStream tty) {
    Method m = getMethod();
    tty.print("MethodData for " + m.getName().asString() + m.getSignature().asString());
  }

  public void iterateFields(OopVisitor visitor, boolean doVMFields) {
    super.iterateFields(visitor, doVMFields);
    if (doVMFields) {
      visitor.doOop(method, true);
      visitor.doCInt(size, true);
    }
  }
}