1/*
2 * Copyright (c) 2012, 2015, 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.nodes;
24
25import static org.graalvm.compiler.nodeinfo.NodeCycles.CYCLES_2;
26import static org.graalvm.compiler.nodeinfo.NodeSize.SIZE_1;
27
28import org.graalvm.compiler.api.replacements.Snippet;
29import org.graalvm.compiler.core.common.LIRKind;
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.spi.LIRLowerable;
36import org.graalvm.compiler.nodes.spi.NodeLIRBuilderTool;
37
38import jdk.vm.ci.meta.AllocatableValue;
39import jdk.vm.ci.meta.JavaKind;
40
41/**
42 * Intrinsification for getting the address of an object. The code path(s) between a call to
43 * {@link #get(Object)} and all uses of the returned value must not contain safepoints. This can
44 * only be guaranteed if used in a snippet that is instantiated after frame state assignment.
45 * {@link ComputeObjectAddressNode} should generally be used in preference to this node.
46 */
47@NodeInfo(cycles = CYCLES_2, size = SIZE_1)
48public final class GetObjectAddressNode extends FixedWithNextNode implements LIRLowerable {
49    public static final NodeClass<GetObjectAddressNode> TYPE = NodeClass.create(GetObjectAddressNode.class);
50
51    @Input ValueNode object;
52
53    public GetObjectAddressNode(ValueNode obj) {
54        super(TYPE, StampFactory.forKind(JavaKind.Long));
55        this.object = obj;
56    }
57
58    @NodeIntrinsic
59    public static native long get(Object array);
60
61    @Override
62    public void generate(NodeLIRBuilderTool gen) {
63        AllocatableValue obj = gen.getLIRGeneratorTool().newVariable(LIRKind.unknownReference(gen.getLIRGeneratorTool().target().arch.getWordKind()));
64        gen.getLIRGeneratorTool().emitMove(obj, gen.operand(object));
65        gen.setResult(this, obj);
66    }
67
68    @Override
69    public boolean verify() {
70        assert graph().getGuardsStage().areFrameStatesAtDeopts() || graph().method().getAnnotation(Snippet.class) != null : "GetObjectAddressNode can't be used directly until frame states are fixed";
71        return super.verify();
72    }
73}
74