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 }