author | stefank |
Tue, 19 Feb 2019 10:03:41 +0100 | |
changeset 53814 | eff915f3d3f2 |
parent 52925 | 9c18c9d839d3 |
child 54388 | a1acc800c87a |
permissions | -rw-r--r-- |
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/* |
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* Copyright (c) 2000, 2019, Oracle and/or its affiliates. All rights reserved. |
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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* |
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* This code is free software; you can redistribute it and/or modify it |
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* under the terms of the GNU General Public License version 2 only, as |
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* published by the Free Software Foundation. |
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* |
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* This code is distributed in the hope that it will be useful, but WITHOUT |
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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* version 2 for more details (a copy is included in the LICENSE file that |
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* accompanied this code). |
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* |
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* You should have received a copy of the GNU General Public License version |
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* 2 along with this work; if not, write to the Free Software Foundation, |
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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* |
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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* or visit www.oracle.com if you need additional information or have any |
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* questions. |
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* |
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*/ |
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||
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// |
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// The ObjectHeap is an abstraction over all generations in the VM |
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// It gives access to all present objects and classes. |
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// |
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package sun.jvm.hotspot.oops; |
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import java.util.*; |
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import sun.jvm.hotspot.debugger.*; |
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import sun.jvm.hotspot.gc.cms.*; |
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import sun.jvm.hotspot.gc.shared.*; |
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import sun.jvm.hotspot.gc.epsilon.*; |
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import sun.jvm.hotspot.gc.g1.*; |
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import sun.jvm.hotspot.gc.shenandoah.*; |
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import sun.jvm.hotspot.gc.parallel.*; |
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import sun.jvm.hotspot.gc.z.*; |
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import sun.jvm.hotspot.memory.*; |
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import sun.jvm.hotspot.runtime.*; |
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import sun.jvm.hotspot.types.*; |
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import sun.jvm.hotspot.utilities.*; |
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public class ObjectHeap { |
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private static final boolean DEBUG; |
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static { |
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DEBUG = System.getProperty("sun.jvm.hotspot.oops.ObjectHeap.DEBUG") != null; |
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} |
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public ObjectHeap(TypeDataBase db) throws WrongTypeException { |
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// Get commonly used sizes of basic types |
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oopSize = VM.getVM().getOopSize(); |
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byteSize = db.getJByteType().getSize(); |
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charSize = db.getJCharType().getSize(); |
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booleanSize = db.getJBooleanType().getSize(); |
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intSize = db.getJIntType().getSize(); |
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shortSize = db.getJShortType().getSize(); |
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longSize = db.getJLongType().getSize(); |
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floatSize = db.getJFloatType().getSize(); |
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doubleSize = db.getJDoubleType().getSize(); |
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} |
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/** Comparison operation for oops, either or both of which may be null */ |
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public boolean equal(Oop o1, Oop o2) { |
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if (o1 != null) return o1.equals(o2); |
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return (o2 == null); |
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} |
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// Cached sizes of basic types |
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private long oopSize; |
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private long byteSize; |
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private long charSize; |
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private long booleanSize; |
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private long intSize; |
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private long shortSize; |
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private long longSize; |
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private long floatSize; |
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private long doubleSize; |
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public long getOopSize() { return oopSize; } |
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public long getByteSize() { return byteSize; } |
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public long getCharSize() { return charSize; } |
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public long getBooleanSize() { return booleanSize; } |
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public long getIntSize() { return intSize; } |
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public long getShortSize() { return shortSize; } |
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public long getLongSize() { return longSize; } |
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public long getFloatSize() { return floatSize; } |
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public long getDoubleSize() { return doubleSize; } |
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/** an interface to filter objects while walking heap */ |
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public static interface ObjectFilter { |
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public boolean canInclude(Oop obj); |
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} |
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/** The base heap iteration mechanism */ |
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public void iterate(HeapVisitor visitor) { |
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iterateLiveRegions(collectLiveRegions(), visitor, null); |
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} |
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/** iterate objects satisfying a specified ObjectFilter */ |
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public void iterate(HeapVisitor visitor, ObjectFilter of) { |
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iterateLiveRegions(collectLiveRegions(), visitor, of); |
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} |
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/** iterate objects of given Klass. param 'includeSubtypes' tells whether to |
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* include objects of subtypes or not */ |
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public void iterateObjectsOfKlass(HeapVisitor visitor, final Klass k, boolean includeSubtypes) { |
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if (includeSubtypes) { |
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if (k.isFinal()) { |
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// do the simpler "exact" klass loop |
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iterateExact(visitor, k); |
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} else { |
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iterateSubtypes(visitor, k); |
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} |
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} else { |
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// there can no object of abstract classes and interfaces |
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if (!k.isAbstract() && !k.isInterface()) { |
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iterateExact(visitor, k); |
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} |
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} |
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} |
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/** iterate objects of given Klass (objects of subtypes included) */ |
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public void iterateObjectsOfKlass(HeapVisitor visitor, final Klass k) { |
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iterateObjectsOfKlass(visitor, k, true); |
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} |
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/** This routine can be used to iterate through the heap at an |
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extremely low level (stepping word-by-word) to provide the |
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ability to do very low-level debugging */ |
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public void iterateRaw(RawHeapVisitor visitor) { |
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List liveRegions = collectLiveRegions(); |
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// Summarize size |
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long totalSize = 0; |
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for (int i = 0; i < liveRegions.size(); i += 2) { |
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Address bottom = (Address) liveRegions.get(i); |
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Address top = (Address) liveRegions.get(i+1); |
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totalSize += top.minus(bottom); |
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} |
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visitor.prologue(totalSize); |
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for (int i = 0; i < liveRegions.size(); i += 2) { |
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Address bottom = (Address) liveRegions.get(i); |
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Address top = (Address) liveRegions.get(i+1); |
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// Traverses the space from bottom to top |
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while (bottom.lessThan(top)) { |
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visitor.visitAddress(bottom); |
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bottom = bottom.addOffsetTo(VM.getVM().getAddressSize()); |
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} |
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} |
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visitor.epilogue(); |
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} |
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public boolean isValidMethod(Address handle) { |
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try { |
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Method m = (Method)Metadata.instantiateWrapperFor(handle); |
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return true; |
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} catch (Exception e) { |
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return false; |
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} |
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} |
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// Creates an instance from the Oop hierarchy based based on the handle |
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public Oop newOop(OopHandle handle) { |
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// The only known way to detect the right type of an oop is |
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// traversing the class chain until a well-known klass is recognized. |
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// A more direct solution would require the klasses to expose |
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// the C++ vtbl structure. |
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// Handle the null reference |
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if (handle == null) return null; |
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// Then check if obj.klass() is one of the root objects |
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Klass klass = Oop.getKlassForOopHandle(handle); |
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if (klass != null) { |
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if (klass instanceof TypeArrayKlass) return new TypeArray(handle, this); |
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if (klass instanceof ObjArrayKlass) return new ObjArray(handle, this); |
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if (klass instanceof InstanceKlass) return new Instance(handle, this); |
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} |
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if (DEBUG) { |
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System.err.println("Unknown oop at " + handle); |
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System.err.println("Oop's klass is " + klass); |
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} |
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throw new UnknownOopException(); |
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} |
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// Print all objects in the object heap |
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public void print() { |
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HeapPrinter printer = new HeapPrinter(System.out); |
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iterate(printer); |
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} |
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//--------------------------------------------------------------------------- |
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// Internals only below this point |
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// |
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private void iterateExact(HeapVisitor visitor, final Klass k) { |
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iterateLiveRegions(collectLiveRegions(), visitor, new ObjectFilter() { |
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public boolean canInclude(Oop obj) { |
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Klass tk = obj.getKlass(); |
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// null Klass is seen sometimes! |
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return (tk != null && tk.equals(k)); |
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} |
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}); |
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} |
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private void iterateSubtypes(HeapVisitor visitor, final Klass k) { |
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iterateLiveRegions(collectLiveRegions(), visitor, new ObjectFilter() { |
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public boolean canInclude(Oop obj) { |
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Klass tk = obj.getKlass(); |
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// null Klass is seen sometimes! |
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return (tk != null && tk.isSubtypeOf(k)); |
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} |
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}); |
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} |
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private void iterateLiveRegions(List liveRegions, HeapVisitor visitor, ObjectFilter of) { |
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// Summarize size |
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long totalSize = 0; |
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for (int i = 0; i < liveRegions.size(); i += 2) { |
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Address bottom = (Address) liveRegions.get(i); |
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Address top = (Address) liveRegions.get(i+1); |
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totalSize += top.minus(bottom); |
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} |
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visitor.prologue(totalSize); |
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CompactibleFreeListSpace cmsSpaceOld = null; |
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CollectedHeap heap = VM.getVM().getUniverse().heap(); |
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if (heap instanceof GenCollectedHeap) { |
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GenCollectedHeap genHeap = (GenCollectedHeap) heap; |
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Generation genOld = genHeap.getGen(1); |
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if (genOld instanceof ConcurrentMarkSweepGeneration) { |
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ConcurrentMarkSweepGeneration concGen = (ConcurrentMarkSweepGeneration)genOld; |
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cmsSpaceOld = concGen.cmsSpace(); |
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} |
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} |
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for (int i = 0; i < liveRegions.size(); i += 2) { |
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Address bottom = (Address) liveRegions.get(i); |
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Address top = (Address) liveRegions.get(i+1); |
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try { |
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// Traverses the space from bottom to top |
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OopHandle handle = bottom.addOffsetToAsOopHandle(0); |
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while (handle.lessThan(top)) { |
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Oop obj = null; |
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try { |
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obj = newOop(handle); |
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} catch (UnknownOopException exp) { |
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if (DEBUG) { |
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throw new RuntimeException(" UnknownOopException " + exp); |
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} |
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} |
267 |
if (obj == null) { |
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//Find the object size using Printezis bits and skip over |
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long size = 0; |
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if ( (cmsSpaceOld != null) && cmsSpaceOld.contains(handle) ){ |
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size = cmsSpaceOld.collector().blockSizeUsingPrintezisBits(handle); |
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} |
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||
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if (size <= 0) { |
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//Either Printezis bits not set or handle is not in cms space. |
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throw new UnknownOopException(); |
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} |
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handle = handle.addOffsetToAsOopHandle(CompactibleFreeListSpace.adjustObjectSizeInBytes(size)); |
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continue; |
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} |
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if (of == null || of.canInclude(obj)) { |
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if (visitor.doObj(obj)) { |
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// doObj() returns true to abort this loop. |
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286 |
break; |
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287 |
} |
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} |
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if ( (cmsSpaceOld != null) && cmsSpaceOld.contains(handle)) { |
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handle = handle.addOffsetToAsOopHandle(CompactibleFreeListSpace.adjustObjectSizeInBytes(obj.getObjectSize()) ); |
291 |
} else { |
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292 |
handle = handle.addOffsetToAsOopHandle(obj.getObjectSize()); |
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} |
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294 |
} |
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295 |
} |
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296 |
catch (AddressException e) { |
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297 |
// This is okay at the top of these regions |
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} |
1 | 299 |
catch (UnknownOopException e) { |
300 |
// This is okay at the top of these regions |
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} |
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302 |
} |
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303 |
||
304 |
visitor.epilogue(); |
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} |
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private static class LiveRegionsCollector implements LiveRegionsClosure { |
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LiveRegionsCollector(List<Address> l) { |
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liveRegions = l; |
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} |
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@Override |
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public void doLiveRegions(LiveRegionsProvider lrp) { |
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for (MemRegion reg : lrp.getLiveRegions()) { |
1 | 315 |
Address top = reg.end(); |
316 |
Address bottom = reg.start(); |
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317 |
if (Assert.ASSERTS_ENABLED) { |
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Assert.that(top != null, "top address in a live region should not be null"); |
1 | 319 |
} |
320 |
if (Assert.ASSERTS_ENABLED) { |
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Assert.that(bottom != null, "bottom address in a live region should not be null"); |
1 | 322 |
} |
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liveRegions.add(top); |
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liveRegions.add(bottom); |
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if (DEBUG) { |
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System.err.println("Live region: " + lrp + ": " + bottom + ", " + top); |
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} |
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} |
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} |
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private List<Address> liveRegions; |
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} |
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// Returns a List<Address> where the addresses come in pairs. These |
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// designate the live regions of the heap. |
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private List<Address> collectLiveRegions() { |
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// We want to iterate through all live portions of the heap, but |
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// do not want to abort the heap traversal prematurely if we find |
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// a problem (like an allocated but uninitialized object at the |
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// top of a generation). To do this we enumerate all generations' |
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// bottom and top regions, and factor in TLABs if necessary. |
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// Addresses come in pairs. |
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List<Address> liveRegions = new ArrayList<>(); |
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LiveRegionsCollector lrc = new LiveRegionsCollector(liveRegions); |
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CollectedHeap heap = VM.getVM().getUniverse().heap(); |
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heap.liveRegionsIterate(lrc); |
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// If UseTLAB is enabled, snip out regions associated with TLABs' |
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// dead regions. Note that TLABs can be present in any generation. |
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// FIXME: consider adding fewer boundaries to live region list. |
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// Theoretically only need to stop at TLAB's top and resume at its |
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// end. |
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if (VM.getVM().getUseTLAB()) { |
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for (JavaThread thread = VM.getVM().getThreads().first(); thread != null; thread = thread.next()) { |
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ThreadLocalAllocBuffer tlab = thread.tlab(); |
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if (tlab.start() != null) { |
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if ((tlab.top() == null) || (tlab.end() == null)) { |
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System.err.print("Warning: skipping invalid TLAB for thread "); |
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thread.printThreadIDOn(System.err); |
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System.err.println(); |
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} else { |
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if (DEBUG) { |
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System.err.print("TLAB for " + thread.getThreadName() + ", #"); |
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thread.printThreadIDOn(System.err); |
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System.err.print(": "); |
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tlab.printOn(System.err); |
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} |
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// Go from: |
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// - below start() to start() |
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// - start() to top() |
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// - end() and above |
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liveRegions.add(tlab.start()); |
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liveRegions.add(tlab.start()); |
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liveRegions.add(tlab.top()); |
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liveRegions.add(tlab.hardEnd()); |
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} |
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} |
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} |
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} |
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// Now sort live regions |
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sortLiveRegions(liveRegions); |
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if (Assert.ASSERTS_ENABLED) { |
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Assert.that(liveRegions.size() % 2 == 0, "Must have even number of region boundaries"); |
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} |
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if (DEBUG) { |
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System.err.println("liveRegions:"); |
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for (int i = 0; i < liveRegions.size(); i += 2) { |
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Address bottom = (Address) liveRegions.get(i); |
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Address top = (Address) liveRegions.get(i+1); |
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System.err.println(" " + bottom + " - " + top); |
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} |
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} |
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return liveRegions; |
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} |
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private void sortLiveRegions(List<Address> liveRegions) { |
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Collections.sort(liveRegions, new Comparator<Address>() { |
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public int compare(Address a1, Address a2) { |
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if (AddressOps.lt(a1, a2)) { |
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return -1; |
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} else if (AddressOps.gt(a1, a2)) { |
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return 1; |
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} |
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return 0; |
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} |
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}); |
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} |
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} |