1 /* 2 * Copyright (c) 2015, 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.hotspot.meta; 26 27 import java.util.function.Supplier; 28 29 import org.graalvm.compiler.core.common.type.ObjectStamp; 30 import org.graalvm.compiler.core.common.type.Stamp; 31 import org.graalvm.compiler.core.common.type.StampFactory; 32 import org.graalvm.compiler.hotspot.nodes.aot.InitializeKlassNode; 33 import org.graalvm.compiler.hotspot.nodes.aot.ResolveConstantNode; 34 import org.graalvm.compiler.nodes.ConstantNode; 35 import org.graalvm.compiler.nodes.DeoptimizingFixedWithNextNode; 36 import org.graalvm.compiler.nodes.FrameState; 37 import org.graalvm.compiler.nodes.ValueNode; 38 import org.graalvm.compiler.nodes.graphbuilderconf.ClassInitializationPlugin; 39 import org.graalvm.compiler.nodes.graphbuilderconf.GraphBuilderContext; 40 41 import jdk.vm.ci.hotspot.HotSpotConstantPool; 42 import jdk.vm.ci.hotspot.HotSpotResolvedObjectType; 43 import jdk.vm.ci.meta.ConstantPool; 44 import jdk.vm.ci.meta.ResolvedJavaMethod; 45 import jdk.vm.ci.meta.ResolvedJavaType; 46 47 public final class HotSpotClassInitializationPlugin implements ClassInitializationPlugin { 48 private static boolean shouldApply(GraphBuilderContext builder, ResolvedJavaType type) { 49 if (!builder.parsingIntrinsic()) { 50 if (!type.isArray()) { 51 ResolvedJavaMethod method = builder.getGraph().method(); 52 ResolvedJavaType methodHolder = method.getDeclaringClass(); 53 // We can elide initialization nodes if type >=: methodHolder. 54 // The type is already initialized by either "new" or "invokestatic". 55 56 // Emit initialization node if type is an interface since: 57 // JLS 12.4: Before a class is initialized, its direct superclass must be 58 // initialized, but interfaces implemented by the class are not 59 // initialized and a class or interface type T will be initialized 60 // immediately before the first occurrence of accesses listed 61 // in JLS 12.4.1. 62 63 return !type.isAssignableFrom(methodHolder) || type.isInterface(); 64 } else if (!type.getComponentType().isPrimitive()) { 65 // Always apply to object array types 66 return true; 67 } 68 } 69 return false; 70 } 71 72 @Override 73 public boolean apply(GraphBuilderContext builder, ResolvedJavaType type, Supplier<FrameState> frameState, ValueNode[] classInit) { 74 if (shouldApply(builder, type)) { 75 Stamp hubStamp = builder.getStampProvider().createHubStamp((ObjectStamp) StampFactory.objectNonNull()); 76 ConstantNode hub = builder.append(ConstantNode.forConstant(hubStamp, ((HotSpotResolvedObjectType) type).klass(), builder.getMetaAccess(), builder.getGraph())); 77 DeoptimizingFixedWithNextNode result = builder.append(type.isArray() ? new ResolveConstantNode(hub) : new InitializeKlassNode(hub)); 78 result.setStateBefore(frameState.get()); 79 if (classInit != null) { 80 classInit[0] = result; 81 } 82 return true; 83 } 84 return false; 85 } 86 87 @Override 88 public boolean supportsLazyInitialization(ConstantPool cp) { 89 // jdk.vm.ci.hotspot.HotSpotConstantPool is final, so we can 90 // directly compare Classes. 91 return (cp instanceof HotSpotConstantPool); 92 } 93 94 @Override 95 public void loadReferencedType(GraphBuilderContext builder, ConstantPool cp, int cpi, int opcode) { 96 if (cp instanceof HotSpotConstantPool) { 97 ((HotSpotConstantPool) cp).loadReferencedType(cpi, opcode, false); 98 } else { 99 cp.loadReferencedType(cpi, opcode); 100 } 101 } 102 103 }