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 */ 23 package org.graalvm.compiler.hotspot.nodes; 24 25 import static org.graalvm.compiler.nodeinfo.NodeCycles.CYCLES_2; 26 import static org.graalvm.compiler.nodeinfo.NodeSize.SIZE_1; 27 28 import org.graalvm.compiler.api.replacements.Snippet; 29 import org.graalvm.compiler.core.common.LIRKind; 30 import org.graalvm.compiler.core.common.type.StampFactory; 31 import org.graalvm.compiler.graph.NodeClass; 32 import org.graalvm.compiler.nodeinfo.NodeInfo; 33 import org.graalvm.compiler.nodes.FixedWithNextNode; 34 import org.graalvm.compiler.nodes.ValueNode; 35 import org.graalvm.compiler.nodes.spi.LIRLowerable; 36 import org.graalvm.compiler.nodes.spi.NodeLIRBuilderTool; 37 38 import jdk.vm.ci.meta.AllocatableValue; 39 import 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) 48 public 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 }