001/*
002 * Copyright (c) 2013, 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.nodes.extended;
024
025import com.oracle.graal.compiler.common.type.*;
026import com.oracle.graal.graph.*;
027import com.oracle.graal.nodeinfo.*;
028import com.oracle.graal.nodes.*;
029import com.oracle.graal.nodes.spi.*;
030
031@NodeInfo(allowedUsageTypes = {InputType.Guard})
032public final class NullCheckNode extends DeoptimizingFixedWithNextNode implements LIRLowerable, GuardingNode {
033
034    public static final NodeClass<NullCheckNode> TYPE = NodeClass.create(NullCheckNode.class);
035    @Input ValueNode object;
036
037    public NullCheckNode(ValueNode object) {
038        super(TYPE, StampFactory.forVoid());
039        this.object = object;
040    }
041
042    public ValueNode getObject() {
043        return object;
044    }
045
046    @Override
047    public void generate(NodeLIRBuilderTool generator) {
048        generator.getLIRGeneratorTool().emitNullCheck(generator.operand(object), generator.state(this));
049    }
050
051    @Override
052    public boolean canDeoptimize() {
053        return true;
054    }
055
056    @NodeIntrinsic
057    public static native void nullCheck(Object object);
058}