FinalFieldBarrierNode.java revision 13017:134219a5b0ec 
1/*
2 * Copyright (c) 2016, 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 */
23package org.graalvm.compiler.nodes.java;
24
25import static jdk.vm.ci.code.MemoryBarriers.LOAD_STORE;
26import static jdk.vm.ci.code.MemoryBarriers.STORE_STORE;
27import static org.graalvm.compiler.nodeinfo.NodeCycles.CYCLES_2;
28import static org.graalvm.compiler.nodeinfo.NodeSize.SIZE_2;
29
30import org.graalvm.compiler.core.common.type.StampFactory;
31import org.graalvm.compiler.graph.NodeClass;
32import org.graalvm.compiler.nodeinfo.NodeInfo;
33import org.graalvm.compiler.nodes.FixedWithNextNode;
34import org.graalvm.compiler.nodes.ValueNode;
35import org.graalvm.compiler.nodes.extended.MembarNode;
36import org.graalvm.compiler.nodes.spi.Lowerable;
37import org.graalvm.compiler.nodes.spi.LoweringTool;
38import org.graalvm.compiler.nodes.spi.Virtualizable;
39import org.graalvm.compiler.nodes.spi.VirtualizerTool;
40import org.graalvm.compiler.nodes.virtual.VirtualObjectNode;
41
42@NodeInfo(cycles = CYCLES_2, size = SIZE_2)
43public class FinalFieldBarrierNode extends FixedWithNextNode implements Virtualizable, Lowerable {
44    public static final NodeClass<FinalFieldBarrierNode> TYPE = NodeClass.create(FinalFieldBarrierNode.class);
45
46    @OptionalInput private ValueNode value;
47
48    public FinalFieldBarrierNode(ValueNode value) {
49        super(TYPE, StampFactory.forVoid());
50        this.value = value;
51    }
52
53    public ValueNode getValue() {
54        return value;
55    }
56
57    @Override
58    public void virtualize(VirtualizerTool tool) {
59        if (value != null && tool.getAlias(value) instanceof VirtualObjectNode) {
60            tool.delete();
61        }
62    }
63
64    @Override
65    public void lower(LoweringTool tool) {
66        graph().replaceFixedWithFixed(this, graph().add(new MembarNode(LOAD_STORE | STORE_STORE)));
67    }
68}
69