Mercurial > hg > graal-jvmci-8
view agent/src/share/classes/sun/jvm/hotspot/oops/Oop.java @ 6972:bd7a7ce2e264
6830717: replay of compilations would help with debugging
Summary: When java process crashed in compiler thread, repeat the compilation process will help finding root cause. This is done with using SA dump application class data and replay data from core dump, then use debug version of jvm to recompile the problematic java method.
Reviewed-by: kvn, twisti, sspitsyn
Contributed-by: yumin.qi@oracle.com
author | minqi |
---|---|
date | Mon, 12 Nov 2012 14:03:53 -0800 |
parents | 8e47bac5643a |
children | 8552f0992748 |
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/* * Copyright (c) 2000, 2012, 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.oops; import java.io.*; import java.util.*; import sun.jvm.hotspot.utilities.*; import sun.jvm.hotspot.debugger.*; import sun.jvm.hotspot.runtime.*; import sun.jvm.hotspot.types.*; // Oop represents the superclass for all types of // objects in the HotSpot object heap. public class 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("oopDesc"); mark = new CIntField(type.getCIntegerField("_mark"), 0); klass = new MetadataField(type.getAddressField("_metadata._klass"), 0); compressedKlass = new NarrowKlassField(type.getAddressField("_metadata._compressed_klass"), 0); headerSize = type.getSize(); } private OopHandle handle; private ObjectHeap heap; Oop(OopHandle handle, ObjectHeap heap) { this.handle = handle; this.heap = heap; } ObjectHeap getHeap() { return heap; } /** Should not be used or needed by most clients outside this package; is needed, however, by {@link sun.jvm.hotspot.utilities.MarkBits}. */ public OopHandle getHandle() { return handle; } private static long headerSize; public static long getHeaderSize() { return headerSize; } // Header size in bytes. private static CIntField mark; private static MetadataField klass; private static NarrowKlassField compressedKlass; // Accessors for declared fields public Mark getMark() { return new Mark(getHandle()); } public Klass getKlass() { if (VM.getVM().isCompressedKlassPointersEnabled()) { return (Klass)compressedKlass.getValue(getHandle()); } else { return (Klass)klass.getValue(getHandle()); } } public boolean isA(Klass k) { return getKlass().isSubtypeOf(k); } // Returns the byte size of this object public long getObjectSize() { Klass k = getKlass(); // All other types should be overriding getObjectSize directly return ((InstanceKlass)k).getObjectSize(this); } // Type test operations public boolean isInstance() { return false; } public boolean isInstanceRef() { return false; } public boolean isArray() { return false; } public boolean isObjArray() { return false; } public boolean isTypeArray() { return false; } public boolean isThread() { return false; } // Align the object size. public static long alignObjectSize(long size) { return VM.getVM().alignUp(size, VM.getVM().getMinObjAlignmentInBytes()); } // All vm's align longs, so pad out certain offsets. public static long alignObjectOffset(long offset) { return VM.getVM().alignUp(offset, VM.getVM().getBytesPerLong()); } public boolean equals(Object obj) { if (obj != null && (obj instanceof Oop)) { return getHandle().equals(((Oop) obj).getHandle()); } return false; } public int hashCode() { return getHandle().hashCode(); } /** Identity hash in the target VM */ public long identityHash() { Mark mark = getMark(); if (mark.isUnlocked() && (!mark.hasNoHash())) { return (int) mark.hash(); } else if (mark.isMarked()) { return (int) mark.hash(); } else { return slowIdentityHash(); } } public long slowIdentityHash() { return VM.getVM().getObjectSynchronizer().identityHashValueFor(this); } public void iterate(OopVisitor visitor, boolean doVMFields) { visitor.setObj(this); visitor.prologue(); iterateFields(visitor, doVMFields); visitor.epilogue(); } void iterateFields(OopVisitor visitor, boolean doVMFields) { if (doVMFields) { visitor.doCInt(mark, true); if (VM.getVM().isCompressedKlassPointersEnabled()) { throw new InternalError("unimplemented"); } else { visitor.doMetadata(klass, true); } } } public void print() { printOn(System.out); } public void printValue() { printValueOn(System.out); } public void printRaw() { printRawOn(System.out); } public static void printOopValueOn(Oop obj, PrintStream tty) { if (obj == null) { tty.print("null"); } else { obj.printValueOn(tty); tty.print(" @ " + obj.getHandle()); } } public static void printOopAddressOn(Oop obj, PrintStream tty) { if (obj == null) { tty.print("null"); } else { tty.print(obj.getHandle().toString()); } } public void printOn(PrintStream tty) { OopPrinter printer = new OopPrinter(tty); iterate(printer, true); } public void printValueOn(PrintStream tty) { try { tty.print("Oop for " + getKlass().getName().asString()); } catch (java.lang.NullPointerException e) { tty.print("Oop"); } } public void printRawOn(PrintStream tty) { tty.print("Dumping raw memory for "); printValueOn(tty); tty.println(); long size = getObjectSize() * 4; for (long i = 0; i < size; i += 4) { long memVal = getHandle().getCIntegerAt(i, 4, true); tty.println(Long.toHexString(memVal)); } } public boolean verify() { return true;} // Package-private routine to speed up ObjectHeap.newOop static Klass getKlassForOopHandle(OopHandle handle) { if (handle == null) { return null; } if (VM.getVM().isCompressedKlassPointersEnabled()) { return (Klass)Metadata.instantiateWrapperFor(handle.getCompKlassAddressAt(compressedKlass.getOffset())); } else { return (Klass)Metadata.instantiateWrapperFor(handle.getAddressAt(klass.getOffset())); } } };