1 /* 2 * Copyright (c) 2009, 2018, 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 24 25 package org.graalvm.compiler.nodes.java; 26 27 import java.lang.ref.Reference; 28 import java.util.Collections; 29 30 import org.graalvm.compiler.core.common.type.StampFactory; 31 import org.graalvm.compiler.core.common.type.TypeReference; 32 import org.graalvm.compiler.graph.NodeClass; 33 import org.graalvm.compiler.nodeinfo.NodeInfo; 34 import org.graalvm.compiler.nodes.ConstantNode; 35 import org.graalvm.compiler.nodes.FrameState; 36 import org.graalvm.compiler.nodes.ValueNode; 37 import org.graalvm.compiler.nodes.spi.VirtualizableAllocation; 38 import org.graalvm.compiler.nodes.spi.VirtualizerTool; 39 import org.graalvm.compiler.nodes.virtual.VirtualInstanceNode; 40 41 import jdk.vm.ci.meta.ResolvedJavaField; 42 import jdk.vm.ci.meta.ResolvedJavaType; 43 44 /** 45 * The {@code NewInstanceNode} represents the allocation of an instance class object. 46 */ 47 @NodeInfo(nameTemplate = "New {p#instanceClass/s}") 48 public class NewInstanceNode extends AbstractNewObjectNode implements VirtualizableAllocation { 49 50 public static final NodeClass<NewInstanceNode> TYPE = NodeClass.create(NewInstanceNode.class); 51 protected final ResolvedJavaType instanceClass; 52 53 public NewInstanceNode(ResolvedJavaType type, boolean fillContents) { 54 this(TYPE, type, fillContents, null); 55 } 56 57 public NewInstanceNode(ResolvedJavaType type, boolean fillContents, FrameState stateBefore) { 58 this(TYPE, type, fillContents, stateBefore); 59 } 60 61 protected NewInstanceNode(NodeClass<? extends NewInstanceNode> c, ResolvedJavaType type, boolean fillContents, FrameState stateBefore) { 62 super(c, StampFactory.objectNonNull(TypeReference.createExactTrusted(type)), fillContents, stateBefore); 63 assert !type.isArray() && !type.isInterface() && !type.isPrimitive() && !type.isAbstract(); 64 this.instanceClass = type; 65 } 66 67 /** 68 * Gets the instance class being allocated by this node. 69 * 70 * @return the instance class allocated 71 */ 72 public ResolvedJavaType instanceClass() { 73 return instanceClass; 74 } 75 76 @Override 77 public void virtualize(VirtualizerTool tool) { 78 /* 79 * Reference objects can escape into their ReferenceQueue at any safepoint, therefore 80 * they're excluded from escape analysis. 81 */ 82 if (!tool.getMetaAccess().lookupJavaType(Reference.class).isAssignableFrom(instanceClass)) { 83 VirtualInstanceNode virtualObject = createVirtualInstanceNode(true); 84 ResolvedJavaField[] fields = virtualObject.getFields(); 85 ValueNode[] state = new ValueNode[fields.length]; 86 for (int i = 0; i < state.length; i++) { 87 state[i] = defaultFieldValue(fields[i]); 88 } 89 tool.createVirtualObject(virtualObject, state, Collections.<MonitorIdNode> emptyList(), false); 90 tool.replaceWithVirtual(virtualObject); 91 } 92 } 93 94 protected VirtualInstanceNode createVirtualInstanceNode(boolean hasIdentity) { 95 return new VirtualInstanceNode(instanceClass(), hasIdentity); 96 } 97 98 /* Factored out in a separate method so that subclasses can override it. */ 99 protected ConstantNode defaultFieldValue(ResolvedJavaField field) { 100 return ConstantNode.defaultForKind(field.getType().getJavaKind(), graph()); 101 } 102 }