1 /*
   2  * Copyright (c) 2013, 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  */
  23 package org.graalvm.compiler.nodes.extended;
  24 
  25 import static org.graalvm.compiler.nodeinfo.InputType.Guard;
  26 import static org.graalvm.compiler.nodeinfo.NodeCycles.CYCLES_2;
  27 import static org.graalvm.compiler.nodeinfo.NodeSize.SIZE_2;
  28 
  29 import org.graalvm.compiler.core.common.type.StampFactory;
  30 import org.graalvm.compiler.graph.NodeClass;
  31 import org.graalvm.compiler.nodeinfo.NodeInfo;
  32 import org.graalvm.compiler.nodes.DeoptimizingFixedWithNextNode;
  33 import org.graalvm.compiler.nodes.ValueNode;
  34 import org.graalvm.compiler.nodes.spi.LIRLowerable;
  35 import org.graalvm.compiler.nodes.spi.NodeLIRBuilderTool;
  36 
  37 @NodeInfo(allowedUsageTypes = Guard, cycles = CYCLES_2, size = SIZE_2)
  38 public final class NullCheckNode extends DeoptimizingFixedWithNextNode implements LIRLowerable, GuardingNode {
  39 
  40     public static final NodeClass<NullCheckNode> TYPE = NodeClass.create(NullCheckNode.class);
  41     @Input ValueNode object;
  42 
  43     public NullCheckNode(ValueNode object) {
  44         super(TYPE, StampFactory.forVoid());
  45         this.object = object;
  46     }
  47 
  48     public ValueNode getObject() {
  49         return object;
  50     }
  51 
  52     @Override
  53     public void generate(NodeLIRBuilderTool generator) {
  54         generator.getLIRGeneratorTool().emitNullCheck(generator.operand(object), generator.state(this));
  55     }
  56 
  57     @Override
  58     public boolean canDeoptimize() {
  59         return true;
  60     }
  61 
  62     @NodeIntrinsic
  63     public static native void nullCheck(Object object);
  64 }