1/*
2 * Copyright (c) 2012, 2014, 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;
24
25import org.graalvm.compiler.core.common.type.StampFactory;
26import org.graalvm.compiler.graph.Node;
27import org.graalvm.compiler.graph.NodeClass;
28import org.graalvm.compiler.graph.spi.Canonicalizable;
29import org.graalvm.compiler.graph.spi.CanonicalizerTool;
30import org.graalvm.compiler.nodeinfo.InputType;
31import org.graalvm.compiler.nodeinfo.NodeInfo;
32import org.graalvm.compiler.nodes.extended.GuardingNode;
33import org.graalvm.compiler.nodes.spi.LIRLowerable;
34import org.graalvm.compiler.nodes.spi.NodeLIRBuilderTool;
35import org.graalvm.compiler.nodes.spi.Proxy;
36
37@NodeInfo(allowedUsageTypes = {InputType.Guard}, nameTemplate = "Proxy({i#value})")
38public final class GuardProxyNode extends ProxyNode implements GuardingNode, Proxy, LIRLowerable, Canonicalizable {
39
40    public static final NodeClass<GuardProxyNode> TYPE = NodeClass.create(GuardProxyNode.class);
41    @OptionalInput(InputType.Guard) GuardingNode value;
42
43    public GuardProxyNode(GuardingNode value, LoopExitNode proxyPoint) {
44        super(TYPE, StampFactory.forVoid(), proxyPoint);
45        this.value = value;
46    }
47
48    @Override
49    public void generate(NodeLIRBuilderTool generator) {
50    }
51
52    public void setValue(GuardingNode newValue) {
53        this.updateUsages(value.asNode(), newValue.asNode());
54        this.value = newValue;
55    }
56
57    @Override
58    public ValueNode value() {
59        return (value == null ? null : value.asNode());
60    }
61
62    @Override
63    public Node getOriginalNode() {
64        return (value == null ? null : value.asNode());
65    }
66
67    @Override
68    public Node canonical(CanonicalizerTool tool) {
69        if (value == null) {
70            return null;
71        }
72        return this;
73    }
74}
75