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.hotspot.replacements;
24
25import static org.graalvm.compiler.core.common.GraalOptions.ImmutableCode;
26import static org.graalvm.compiler.nodeinfo.NodeCycles.CYCLES_0;
27import static org.graalvm.compiler.nodeinfo.NodeSize.SIZE_0;
28
29import org.graalvm.compiler.core.common.type.AbstractObjectStamp;
30import org.graalvm.compiler.core.common.type.StampFactory;
31import org.graalvm.compiler.graph.Node;
32import org.graalvm.compiler.graph.NodeClass;
33import org.graalvm.compiler.graph.spi.Canonicalizable;
34import org.graalvm.compiler.graph.spi.CanonicalizerTool;
35import org.graalvm.compiler.nodeinfo.NodeInfo;
36import org.graalvm.compiler.nodes.ConstantNode;
37import org.graalvm.compiler.nodes.FixedWithNextNode;
38import org.graalvm.compiler.nodes.ValueNode;
39import org.graalvm.compiler.nodes.memory.MemoryCheckpoint;
40import org.graalvm.compiler.nodes.spi.Lowerable;
41import org.graalvm.compiler.nodes.spi.LoweringTool;
42import org.graalvm.word.LocationIdentity;
43
44import jdk.vm.ci.hotspot.HotSpotObjectConstant;
45import jdk.vm.ci.meta.JavaConstant;
46
47@NodeInfo(cycles = CYCLES_0, size = SIZE_0)
48public class IdentityHashCodeNode extends FixedWithNextNode implements Canonicalizable, Lowerable, MemoryCheckpoint.Single {
49
50    public static final NodeClass<IdentityHashCodeNode> TYPE = NodeClass.create(IdentityHashCodeNode.class);
51
52    @Input ValueNode object;
53
54    public IdentityHashCodeNode(ValueNode object) {
55        super(TYPE, StampFactory.forInteger(32));
56        this.object = object;
57
58    }
59
60    @Override
61    public LocationIdentity getLocationIdentity() {
62        return HotSpotReplacementsUtil.MARK_WORD_LOCATION;
63    }
64
65    @Override
66    public Node canonical(CanonicalizerTool tool) {
67        if (object.isConstant()) {
68            assert object.stamp() instanceof AbstractObjectStamp;
69            JavaConstant c = (JavaConstant) object.asConstant();
70            if (ImmutableCode.getValue(getOptions())) {
71                return this;
72            }
73            JavaConstant identityHashCode = null;
74            if (c.isNull()) {
75                identityHashCode = JavaConstant.forInt(0);
76            } else {
77                identityHashCode = JavaConstant.forInt(((HotSpotObjectConstant) c).getIdentityHashCode());
78            }
79
80            return new ConstantNode(identityHashCode, StampFactory.forConstant(identityHashCode));
81        }
82        return this;
83    }
84
85    @Override
86    public void lower(LoweringTool tool) {
87        tool.getLowerer().lower(this, tool);
88    }
89
90    @NodeIntrinsic
91    public static native int identityHashCode(Object object);
92
93}
94