hotspot/agent/src/share/classes/sun/jvm/hotspot/tools/jcore/ClassDump.java

/*
 * Copyright 2002-2004 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.tools.jcore;

import java.io.*;
import sun.jvm.hotspot.memory.*;
import sun.jvm.hotspot.oops.*;
import sun.jvm.hotspot.debugger.*;
import sun.jvm.hotspot.runtime.*;
import sun.jvm.hotspot.tools.*;

public class ClassDump extends Tool {
    private ClassFilter classFilter;
    private String      outputDirectory;

    public void run() {
        // Ready to go with the database...
        try {

            // load class filters

            String filterClassName = System.getProperty("sun.jvm.hotspot.tools.jcore.filter");
            if (filterClassName != null) {
                try {
                    Class filterClass = Class.forName(filterClassName);
                    classFilter = (ClassFilter) filterClass.newInstance();
                } catch(Exception exp) {
                    System.err.println("Warning: Can not create class filter!");
                }
            }

            outputDirectory = System.getProperty("sun.jvm.hotspot.tools.jcore.outputDir");
            if (outputDirectory == null)
                outputDirectory = ".";

            // walk through the system dictionary
            SystemDictionary dict = VM.getVM().getSystemDictionary();
            dict.classesDo(new SystemDictionary.ClassVisitor() {
                    public void visit(Klass k) {
                        if (k instanceof InstanceKlass)
                            dumpKlass((InstanceKlass) k);
                    }
                });
        }
        catch (AddressException e) {
            System.err.println("Error accessing address 0x"
                               + Long.toHexString(e.getAddress()));
            e.printStackTrace();
        }
    }

    public String getName() {
        return "jcore";
    }

    private void dumpKlass(InstanceKlass kls) {
        if (classFilter != null && ! classFilter.canInclude(kls) ) {
            return;
        }

        String klassName = kls.getName().asString();
        klassName = klassName.replace('/', File.separatorChar);
        int index = klassName.lastIndexOf(File.separatorChar);
        File dir = null;
        if (index != -1) {
            String dirName = klassName.substring(0, index);
            dir =  new File(outputDirectory,  dirName);
        } else {
            dir = new File(outputDirectory);
        }

        dir.mkdirs();
        File f = new File(dir, klassName.substring(klassName.lastIndexOf(File.separatorChar) + 1)
                          + ".class");
        try {
            f.createNewFile();
            OutputStream os = new BufferedOutputStream(new FileOutputStream(f));
            try {
                ClassWriter cw = new ClassWriter(kls, os);
                cw.write();
            } finally {
                os.close();
            }
        } catch(IOException exp) {
            exp.printStackTrace();
        }
    }

    public static void main(String[] args) {
        ClassDump cd = new ClassDump();
        cd.start(args);
        cd.stop();
    }
}