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view agent/src/share/classes/sun/jvm/hotspot/oops/ConstantPoolCacheEntry.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 | da91efe96a93 |
children |
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/* * Copyright (c) 2001, 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.util.*; import sun.jvm.hotspot.debugger.*; import sun.jvm.hotspot.runtime.*; import sun.jvm.hotspot.types.*; import sun.jvm.hotspot.utilities.*; public class ConstantPoolCacheEntry { private static long size; private static long baseOffset; private static CIntegerField indices; private static AddressField f1; private static CIntegerField f2; private static CIntegerField flags; private ConstantPoolCache cp; private long offset; 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("ConstantPoolCacheEntry"); size = type.getSize(); indices = type.getCIntegerField("_indices"); f1 = type.getAddressField ("_f1"); f2 = type.getCIntegerField("_f2"); flags = type.getCIntegerField("_flags"); type = db.lookupType("ConstantPoolCache"); baseOffset = type.getSize(); } ConstantPoolCacheEntry(ConstantPoolCache cp, int index) { this.cp = cp; offset = baseOffset + index * size; } public int getConstantPoolIndex() { if (Assert.ASSERTS_ENABLED) { Assert.that((getIndices() & 0xFFFF) != 0, "must be main entry"); } return (int) (getIndices() & 0xFFFF); } private long getIndices() { return cp.getAddress().getCIntegerAt(indices.getOffset() + offset, indices.getSize(), indices.isUnsigned()); } public Metadata getF1() { return Metadata.instantiateWrapperFor(cp.getAddress().getAddressAt(f1.getOffset() + offset)); } public int getF2() { return cp.getAddress().getJIntAt(f1.getOffset() + offset); } public int getFlags() { return cp.getAddress().getJIntAt(flags.getOffset() + offset); } static NamedFieldIdentifier f1FieldName = new NamedFieldIdentifier("_f1"); static NamedFieldIdentifier f2FieldName = new NamedFieldIdentifier("_f2"); static NamedFieldIdentifier flagsFieldName = new NamedFieldIdentifier("_flags"); public void iterateFields(MetadataVisitor visitor) { visitor.doOop(new OopField(f1FieldName, f1.getOffset() + offset, true), true); visitor.doInt(new IntField(f2FieldName, f2.getOffset() + offset, true), true); visitor.doInt(new IntField(flagsFieldName, flags.getOffset() + offset, true), true); } }