001/*
002 * Copyright (c) 2013, 2015, Oracle and/or its affiliates. All rights reserved.
003 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
004 *
005 * This code is free software; you can redistribute it and/or modify it
006 * under the terms of the GNU General Public License version 2 only, as
007 * published by the Free Software Foundation.
008 *
009 * This code is distributed in the hope that it will be useful, but WITHOUT
010 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
011 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
012 * version 2 for more details (a copy is included in the LICENSE file that
013 * accompanied this code).
014 *
015 * You should have received a copy of the GNU General Public License version
016 * 2 along with this work; if not, write to the Free Software Foundation,
017 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
018 *
019 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
020 * or visit www.oracle.com if you need additional information or have any
021 * questions.
022 */
023package com.oracle.graal.hotspot.nodes;
024
025import com.oracle.graal.graph.*;
026import com.oracle.graal.nodeinfo.*;
027import com.oracle.graal.nodes.*;
028import com.oracle.graal.nodes.memory.address.*;
029
030@NodeInfo
031public final class G1PreWriteBarrier extends ObjectWriteBarrier implements DeoptimizingNode.DeoptBefore {
032
033    public static final NodeClass<G1PreWriteBarrier> TYPE = NodeClass.create(G1PreWriteBarrier.class);
034
035    @OptionalInput(InputType.State) FrameState stateBefore;
036    protected final boolean nullCheck;
037    protected final boolean doLoad;
038
039    public G1PreWriteBarrier(AddressNode address, ValueNode expectedObject, boolean doLoad, boolean nullCheck) {
040        super(TYPE, address, expectedObject, true);
041        this.doLoad = doLoad;
042        this.nullCheck = nullCheck;
043    }
044
045    public ValueNode getExpectedObject() {
046        return getValue();
047    }
048
049    public boolean doLoad() {
050        return doLoad;
051    }
052
053    public boolean getNullCheck() {
054        return nullCheck;
055    }
056
057    @Override
058    public boolean canDeoptimize() {
059        return nullCheck;
060    }
061
062    @Override
063    public FrameState stateBefore() {
064        return stateBefore;
065    }
066
067    @Override
068    public void setStateBefore(FrameState state) {
069        updateUsages(stateBefore, state);
070        stateBefore = state;
071    }
072}