Mercurial > hg > graal-jvmci-8
view agent/src/share/classes/sun/jvm/hotspot/oops/BitData.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 | f6f3bb0ee072 |
children | 79f492f184d0 |
line wrap: on
line source
/* * Copyright (c) 2011, 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 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.oops; import java.io.*; import java.util.*; import sun.jvm.hotspot.debugger.*; import sun.jvm.hotspot.runtime.*; import sun.jvm.hotspot.types.*; import sun.jvm.hotspot.utilities.*; // BitData // // A BitData holds a flag or two in its header. public class BitData extends ProfileData { // nullSeen: // saw a null operand (cast/aastore/instanceof) static final int nullSeenFlag = DataLayout.firstFlag + 0; static final int bitCellCount = 0; public BitData(DataLayout layout) { super(layout); } static int staticCellCount() { return bitCellCount; } public int cellCount() { return staticCellCount(); } // Accessor // The nullSeen flag bit is specially known to the interpreter. // Consulting it allows the compiler to avoid setting up nullCheck traps. boolean nullSeen() { return flagAt(nullSeenFlag); } // Code generation support // static int nullSeenByteConstant() { // return flagNumberToByteConstant(nullSeenFlag); // } static int bitDataSize() { return cellOffset(bitCellCount); } public void printDataOn(PrintStream st) { printShared(st, "BitData"); } }