1 /*

     2  * Copyright (c) 2013, 2018, Oracle and/or its affiliates. All rights reserved.

     3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

     4  *

     5  * This code is free software; you can redistribute it and/or modify it

     6  * under the terms of the GNU General Public License version 2 only, as

     7  * published by the Free Software Foundation.

     8  *

     9  * This code is distributed in the hope that it will be useful, but WITHOUT

    10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

    11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

    12  * version 2 for more details (a copy is included in the LICENSE file that

    13  * accompanied this code).

    14  *

    15  * You should have received a copy of the GNU General Public License version

    16  * 2 along with this work; if not, write to the Free Software Foundation,

    17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

    18  *

    19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

    20  * or visit www.oracle.com if you need additional information or have any

    21  * questions.

    22  */

    23 

    24 

    25 package org.graalvm.compiler.hotspot.nodes;

    26 

    27 import static org.graalvm.compiler.nodeinfo.NodeCycles.CYCLES_64;

    28 import static org.graalvm.compiler.nodeinfo.NodeSize.SIZE_64;

    29 

    30 import org.graalvm.compiler.graph.NodeClass;

    31 import org.graalvm.compiler.nodeinfo.InputType;

    32 import org.graalvm.compiler.nodeinfo.NodeInfo;

    33 import org.graalvm.compiler.nodes.DeoptimizingNode;

    34 import org.graalvm.compiler.nodes.FrameState;

    35 import org.graalvm.compiler.nodes.ValueNode;

    36 import org.graalvm.compiler.nodes.memory.address.AddressNode;

    37 

    38 @NodeInfo(cycles = CYCLES_64, size = SIZE_64)

    39 public final class G1PreWriteBarrier extends ObjectWriteBarrier implements DeoptimizingNode.DeoptBefore {

    40 

    41     public static final NodeClass<G1PreWriteBarrier> TYPE = NodeClass.create(G1PreWriteBarrier.class);

    42 

    43     @OptionalInput(InputType.State) FrameState stateBefore;

    44     protected final boolean nullCheck;

    45     protected final boolean doLoad;

    46 

    47     public G1PreWriteBarrier(AddressNode address, ValueNode expectedObject, boolean doLoad, boolean nullCheck) {

    48         super(TYPE, address, expectedObject, true);

    49         this.doLoad = doLoad;

    50         this.nullCheck = nullCheck;

    51     }

    52 

    53     public ValueNode getExpectedObject() {

    54         return getValue();

    55     }

    56 

    57     public boolean doLoad() {

    58         return doLoad;

    59     }

    60 

    61     public boolean getNullCheck() {

    62         return nullCheck;

    63     }

    64 

    65     @Override

    66     public boolean canDeoptimize() {

    67         return nullCheck;

    68     }

    69 

    70     @Override

    71     public FrameState stateBefore() {

    72         return stateBefore;

    73     }

    74 

    75     @Override

    76     public void setStateBefore(FrameState state) {

    77         updateUsages(stateBefore, state);

    78         stateBefore = state;

    79     }

    80 }