hotspot/agent/src/share/classes/sun/jvm/hotspot/tools/ClassLoaderStats.java - edge/openjdk - Git at Google

 /*
  * Copyright (c) 2003, 2013, 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.tools;

 import java.io.*;
 import java.util.*;

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

 /**
   A command line tool to print class loader statistics.
 */

 public class ClassLoaderStats extends Tool {
    boolean verbose = true;

    public ClassLoaderStats() {
       super();
    }

    public ClassLoaderStats(JVMDebugger d) {
       super(d);
    }

    public static void main(String[] args) {
       ClassLoaderStats cls = new ClassLoaderStats();
       cls.execute(args);
    }

    private static class ClassData {
       Klass klass;
       long  size;

       ClassData(Klass klass, long size) {
          this.klass = klass; this.size = size;
       }
    }

    private static class LoaderData {
       long     numClasses;
       long     classSize;
       List     classDetail = new ArrayList(); // List<ClassData>
    }

    public void run() {
       printClassLoaderStatistics();
    }

    private void printClassLoaderStatistics() {
       final PrintStream out = System.out;
       final PrintStream err = System.err;
       final Map loaderMap = new HashMap();
       // loader data for bootstrap class loader
       final LoaderData bootstrapLoaderData = new LoaderData();
       if (verbose) {
          err.print("finding class loader instances ..");
       }

       VM vm = VM.getVM();
       ObjectHeap heap = vm.getObjectHeap();
       Klass classLoaderKlass = vm.getSystemDictionary().getClassLoaderKlass();
       try {
          heap.iterateObjectsOfKlass(new DefaultHeapVisitor() {
                          public boolean doObj(Oop oop) {
                             loaderMap.put(oop, new LoaderData());
                                                         return false;
                          }
                       }, classLoaderKlass);
       } catch (Exception se) {
          se.printStackTrace();
       }

       if (verbose) {
          err.println("done.");
          err.print("computing per loader stat ..");
       }

       SystemDictionary dict = VM.getVM().getSystemDictionary();
       dict.classesDo(new SystemDictionary.ClassAndLoaderVisitor() {
                         public void visit(Klass k, Oop loader) {
                            if (! (k instanceof InstanceKlass)) {
                               return;
                            }
                            LoaderData ld = (loader != null) ? (LoaderData)loaderMap.get(loader)
                                                             : bootstrapLoaderData;
                            if (ld != null) {
                               ld.numClasses++;
                               long size = computeSize((InstanceKlass)k);
                               ld.classDetail.add(new ClassData(k, size));
                               ld.classSize += size;
                            }
                         }
                      });

       if (verbose) {
          err.println("done.");
          err.print("please wait.. computing liveness");
       }

       // compute reverse pointer analysis (takes long time for larger app)
       ReversePtrsAnalysis analysis = new ReversePtrsAnalysis();

       if (verbose) {
          analysis.setHeapProgressThunk(new HeapProgressThunk() {
             public void heapIterationFractionUpdate(double fractionOfHeapVisited) {
                err.print('.');
             }
             // This will be called after the iteration is complete
             public void heapIterationComplete() {
                err.println("done.");
             }
          });
       }

       try {
          analysis.run();
       } catch (Exception e) {
          // e.printStackTrace();
          if (verbose)
            err.println("liveness analysis may be inaccurate ...");
       }
       ReversePtrs liveness = VM.getVM().getRevPtrs();

       out.println("class_loader\tclasses\tbytes\tparent_loader\talive?\ttype");
       out.println();

       long numClassLoaders = 1L;
       long totalNumClasses = bootstrapLoaderData.numClasses;
       long totalClassSize  = bootstrapLoaderData.classSize;
       long numAliveLoaders = 1L;
       long numDeadLoaders  = 0L;

       // print bootstrap loader details
       out.print("<bootstrap>");
       out.print('\t');
       out.print(bootstrapLoaderData.numClasses);
       out.print('\t');
       out.print(bootstrapLoaderData.classSize);
       out.print('\t');
       out.print("  null  ");
       out.print('\t');
       // bootstrap loader is always alive
       out.print("live");
       out.print('\t');
       out.println("<internal>");

       for (Iterator keyItr = loaderMap.keySet().iterator(); keyItr.hasNext();) {
          Oop loader = (Oop) keyItr.next();
          LoaderData data = (LoaderData) loaderMap.get(loader);
          numClassLoaders ++;
          totalNumClasses += data.numClasses;
          totalClassSize  += data.classSize;

          out.print(loader.getHandle());
          out.print('\t');
          out.print(data.numClasses);
          out.print('\t');
          out.print(data.classSize);
          out.print('\t');

          class ParentFinder extends DefaultOopVisitor {
             public void doOop(OopField field, boolean isVMField) {
                if (field.getID().getName().equals("parent")) {
                   parent = field.getValue(getObj());
                }
             }
             private Oop parent = null;
             public Oop getParent() { return parent; }
          }

          ParentFinder parentFinder = new ParentFinder();
          loader.iterate(parentFinder, false);
          Oop parent = parentFinder.getParent();
          out.print((parent != null)? parent.getHandle().toString() : "  null  ");
          out.print('\t');
          boolean alive = (liveness != null) ? (liveness.get(loader) != null) : true;
          out.print(alive? "live" : "dead");
          if (alive) numAliveLoaders++; else numDeadLoaders++;
          out.print('\t');
          Klass loaderKlass = loader.getKlass();
          if (loaderKlass != null) {
             out.print(loaderKlass.getName().asString());
             out.print('@');
             out.print(loader.getKlass().getAddress());
          } else {
             out.print("    null!    ");
          }
          out.println();
       }

       out.println();
       // summary line
       out.print("total = ");
       out.print(numClassLoaders);
       out.print('\t');
       out.print(totalNumClasses);
       out.print('\t');
       out.print(totalClassSize);
       out.print('\t');
       out.print("    N/A    ");
       out.print('\t');
       out.print("alive=");
       out.print(numAliveLoaders);
       out.print(", dead=");
       out.print(numDeadLoaders);
       out.print('\t');
       out.print("    N/A    ");
       out.println();
    }

    private static long objectSize(Oop oop) {
       return oop == null ? 0L : oop.getObjectSize();
    }

    // Don't count the shared empty arrays
    private static long arraySize(GenericArray arr) {
      return arr.getLength() != 0L ? arr.getSize() : 0L;
    }

    private long computeSize(InstanceKlass k) {
       long size = 0L;
       // the InstanceKlass object itself
       size += k.getSize();

       // Constant pool
       ConstantPool cp = k.getConstants();
       size += cp.getSize();
       if (cp.getCache() != null) {
         size += cp.getCache().getSize();
       }
       size += arraySize(cp.getTags());

       // Interfaces
       size += arraySize(k.getLocalInterfaces());
       size += arraySize(k.getTransitiveInterfaces());

       // Inner classes
       size += arraySize(k.getInnerClasses());

       // Fields
       size += arraySize(k.getFields());

       // Methods
       MethodArray methods = k.getMethods();
       int nmethods = (int) methods.getLength();
       if (nmethods != 0L) {
          size += methods.getSize();
          for (int i = 0; i < nmethods; ++i) {
             Method m = methods.at(i);
             size += m.getSize();
             size += m.getConstMethod().getSize();
          }
       }

       return size;
    }
 }
	/*
	* Copyright (c) 2003, 2013, 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.tools;

	import java.io.*;
	import java.util.*;

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

	/**
	A command line tool to print class loader statistics.
	*/

	public class ClassLoaderStats extends Tool {
	boolean verbose = true;

	public ClassLoaderStats() {
	super();
	}

	public ClassLoaderStats(JVMDebugger d) {
	super(d);
	}

	public static void main(String[] args) {
	ClassLoaderStats cls = new ClassLoaderStats();
	cls.execute(args);
	}

	private static class ClassData {
	Klass klass;
	long size;

	ClassData(Klass klass, long size) {
	this.klass = klass; this.size = size;
	}
	}

	private static class LoaderData {
	long numClasses;
	long classSize;
	List classDetail = new ArrayList(); // List<ClassData>
	}

	public void run() {
	printClassLoaderStatistics();
	}

	private void printClassLoaderStatistics() {
	final PrintStream out = System.out;
	final PrintStream err = System.err;
	final Map loaderMap = new HashMap();
	// loader data for bootstrap class loader
	final LoaderData bootstrapLoaderData = new LoaderData();
	if (verbose) {
	err.print("finding class loader instances ..");
	}

	VM vm = VM.getVM();
	ObjectHeap heap = vm.getObjectHeap();
	Klass classLoaderKlass = vm.getSystemDictionary().getClassLoaderKlass();
	try {
	heap.iterateObjectsOfKlass(new DefaultHeapVisitor() {
	public boolean doObj(Oop oop) {
	loaderMap.put(oop, new LoaderData());
	return false;
	}
	}, classLoaderKlass);
	} catch (Exception se) {
	se.printStackTrace();
	}

	if (verbose) {
	err.println("done.");
	err.print("computing per loader stat ..");
	}

	SystemDictionary dict = VM.getVM().getSystemDictionary();
	dict.classesDo(new SystemDictionary.ClassAndLoaderVisitor() {
	public void visit(Klass k, Oop loader) {
	if (! (k instanceof InstanceKlass)) {
	return;
	}
	LoaderData ld = (loader != null) ? (LoaderData)loaderMap.get(loader)
	: bootstrapLoaderData;
	if (ld != null) {
	ld.numClasses++;
	long size = computeSize((InstanceKlass)k);
	ld.classDetail.add(new ClassData(k, size));
	ld.classSize += size;
	}
	}
	});

	if (verbose) {
	err.println("done.");
	err.print("please wait.. computing liveness");
	}

	// compute reverse pointer analysis (takes long time for larger app)
	ReversePtrsAnalysis analysis = new ReversePtrsAnalysis();

	if (verbose) {
	analysis.setHeapProgressThunk(new HeapProgressThunk() {
	public void heapIterationFractionUpdate(double fractionOfHeapVisited) {
	err.print('.');
	}
	// This will be called after the iteration is complete
	public void heapIterationComplete() {
	err.println("done.");
	}
	});
	}

	try {
	analysis.run();
	} catch (Exception e) {
	// e.printStackTrace();
	if (verbose)
	err.println("liveness analysis may be inaccurate ...");
	}
	ReversePtrs liveness = VM.getVM().getRevPtrs();

	out.println("class_loader\tclasses\tbytes\tparent_loader\talive?\ttype");
	out.println();

	long numClassLoaders = 1L;
	long totalNumClasses = bootstrapLoaderData.numClasses;
	long totalClassSize = bootstrapLoaderData.classSize;
	long numAliveLoaders = 1L;
	long numDeadLoaders = 0L;

	// print bootstrap loader details
	out.print("<bootstrap>");
	out.print('\t');
	out.print(bootstrapLoaderData.numClasses);
	out.print('\t');
	out.print(bootstrapLoaderData.classSize);
	out.print('\t');
	out.print(" null ");
	out.print('\t');
	// bootstrap loader is always alive
	out.print("live");
	out.print('\t');
	out.println("<internal>");

	for (Iterator keyItr = loaderMap.keySet().iterator(); keyItr.hasNext();) {
	Oop loader = (Oop) keyItr.next();
	LoaderData data = (LoaderData) loaderMap.get(loader);
	numClassLoaders ++;
	totalNumClasses += data.numClasses;
	totalClassSize += data.classSize;

	out.print(loader.getHandle());
	out.print('\t');
	out.print(data.numClasses);
	out.print('\t');
	out.print(data.classSize);
	out.print('\t');

	class ParentFinder extends DefaultOopVisitor {
	public void doOop(OopField field, boolean isVMField) {
	if (field.getID().getName().equals("parent")) {
	parent = field.getValue(getObj());
	}
	}
	private Oop parent = null;
	public Oop getParent() { return parent; }
	}

	ParentFinder parentFinder = new ParentFinder();
	loader.iterate(parentFinder, false);
	Oop parent = parentFinder.getParent();
	out.print((parent != null)? parent.getHandle().toString() : " null ");
	out.print('\t');
	boolean alive = (liveness != null) ? (liveness.get(loader) != null) : true;
	out.print(alive? "live" : "dead");
	if (alive) numAliveLoaders++; else numDeadLoaders++;
	out.print('\t');
	Klass loaderKlass = loader.getKlass();
	if (loaderKlass != null) {
	out.print(loaderKlass.getName().asString());
	out.print('@');
	out.print(loader.getKlass().getAddress());
	} else {
	out.print(" null! ");
	}
	out.println();
	}

	out.println();
	// summary line
	out.print("total = ");
	out.print(numClassLoaders);
	out.print('\t');
	out.print(totalNumClasses);
	out.print('\t');
	out.print(totalClassSize);
	out.print('\t');
	out.print(" N/A ");
	out.print('\t');
	out.print("alive=");
	out.print(numAliveLoaders);
	out.print(", dead=");
	out.print(numDeadLoaders);
	out.print('\t');
	out.print(" N/A ");
	out.println();
	}

	private static long objectSize(Oop oop) {
	return oop == null ? 0L : oop.getObjectSize();
	}

	// Don't count the shared empty arrays
	private static long arraySize(GenericArray arr) {
	return arr.getLength() != 0L ? arr.getSize() : 0L;
	}

	private long computeSize(InstanceKlass k) {
	long size = 0L;
	// the InstanceKlass object itself
	size += k.getSize();

	// Constant pool
	ConstantPool cp = k.getConstants();
	size += cp.getSize();
	if (cp.getCache() != null) {
	size += cp.getCache().getSize();
	}
	size += arraySize(cp.getTags());

	// Interfaces
	size += arraySize(k.getLocalInterfaces());
	size += arraySize(k.getTransitiveInterfaces());

	// Inner classes
	size += arraySize(k.getInnerClasses());

	// Fields
	size += arraySize(k.getFields());

	// Methods
	MethodArray methods = k.getMethods();
	int nmethods = (int) methods.getLength();
	if (nmethods != 0L) {
	size += methods.getSize();
	for (int i = 0; i < nmethods; ++i) {
	Method m = methods.at(i);
	size += m.getSize();
	size += m.getConstMethod().getSize();
	}
	}

	return size;
	}
	}