001/*
002 * Copyright (c) 2012, 2015, Oracle and/or its affiliates. All rights reserved.
003 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
004 *
005 * This code is free software; you can redistribute it and/or modify it
006 * under the terms of the GNU General Public License version 2 only, as
007 * published by the Free Software Foundation.
008 *
009 * This code is distributed in the hope that it will be useful, but WITHOUT
010 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
011 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
012 * version 2 for more details (a copy is included in the LICENSE file that
013 * accompanied this code).
014 *
015 * You should have received a copy of the GNU General Public License version
016 * 2 along with this work; if not, write to the Free Software Foundation,
017 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
018 *
019 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
020 * or visit www.oracle.com if you need additional information or have any
021 * questions.
022 */
023package com.oracle.graal.hotspot.nodes;
024
025import jdk.internal.jvmci.meta.*;
026
027import com.oracle.graal.compiler.common.type.*;
028import com.oracle.graal.graph.*;
029import com.oracle.graal.nodeinfo.*;
030import com.oracle.graal.nodes.*;
031import com.oracle.graal.nodes.spi.*;
032import com.oracle.graal.replacements.*;
033
034/**
035 * Intrinsification for getting the address of an object. The code path(s) between a call to
036 * {@link #get(Object)} and all uses of the returned value must not contain safepoints. This can
037 * only be guaranteed if used in a snippet that is instantiated after frame state assignment.
038 * {@link ComputeObjectAddressNode} should generally be used in preference to this node.
039 */
040@NodeInfo
041public final class GetObjectAddressNode extends FixedWithNextNode implements LIRLowerable {
042    public static final NodeClass<GetObjectAddressNode> TYPE = NodeClass.create(GetObjectAddressNode.class);
043
044    @Input ValueNode object;
045
046    public GetObjectAddressNode(ValueNode obj) {
047        super(TYPE, StampFactory.forKind(Kind.Long));
048        this.object = obj;
049    }
050
051    @NodeIntrinsic
052    public static native long get(Object array);
053
054    @Override
055    public void generate(NodeLIRBuilderTool gen) {
056        AllocatableValue obj = gen.getLIRGeneratorTool().newVariable(LIRKind.unknownReference(gen.getLIRGeneratorTool().target().wordKind));
057        gen.getLIRGeneratorTool().emitMove(obj, gen.operand(object));
058        gen.setResult(this, obj);
059    }
060
061    @Override
062    public boolean verify() {
063        assert graph().getGuardsStage().areFrameStatesAtDeopts() || graph().method().getAnnotation(Snippet.class) != null : "GetObjectAddressNode can't be used directly until frame states are fixed";
064        return super.verify();
065    }
066}