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.lang.invoke.MethodHandle; 28 import java.lang.invoke.MethodHandles; 29 import java.lang.invoke.MethodType; 30 import java.util.function.Supplier; 31 32 import org.graalvm.compiler.core.common.type.ObjectStamp; 33 import org.graalvm.compiler.core.common.type.Stamp; 34 import org.graalvm.compiler.core.common.type.StampFactory; 35 import org.graalvm.compiler.debug.GraalError; 36 import org.graalvm.compiler.hotspot.nodes.aot.InitializeKlassNode; 37 import org.graalvm.compiler.hotspot.nodes.aot.ResolveConstantNode; 38 import org.graalvm.compiler.nodes.ConstantNode; 39 import org.graalvm.compiler.nodes.DeoptimizingFixedWithNextNode; 40 import org.graalvm.compiler.nodes.FrameState; 41 import org.graalvm.compiler.nodes.ValueNode; 42 import org.graalvm.compiler.nodes.graphbuilderconf.ClassInitializationPlugin; 43 import org.graalvm.compiler.nodes.graphbuilderconf.GraphBuilderContext; 44 45 import jdk.vm.ci.hotspot.HotSpotResolvedObjectType; 46 import jdk.vm.ci.meta.ConstantPool; 47 import jdk.vm.ci.meta.ResolvedJavaMethod; 48 import jdk.vm.ci.meta.ResolvedJavaType; 49 50 public final class HotSpotClassInitializationPlugin implements ClassInitializationPlugin { shouldApply(GraphBuilderContext builder, ResolvedJavaType type)51 private static boolean shouldApply(GraphBuilderContext builder, ResolvedJavaType type) { 52 if (!builder.parsingIntrinsic()) { 53 if (!type.isArray()) { 54 ResolvedJavaMethod method = builder.getGraph().method(); 55 ResolvedJavaType methodHolder = method.getDeclaringClass(); 56 // We can elide initialization nodes if type >=: methodHolder. 57 // The type is already initialized by either "new" or "invokestatic". 58 59 // Emit initialization node if type is an interface since: 60 // JLS 12.4: Before a class is initialized, its direct superclass must be 61 // initialized, but interfaces implemented by the class are not 62 // initialized and a class or interface type T will be initialized 63 // immediately before the first occurrence of accesses listed 64 // in JLS 12.4.1. 65 66 return !type.isAssignableFrom(methodHolder) || type.isInterface(); 67 } else if (!type.getComponentType().isPrimitive()) { 68 // Always apply to object array types 69 return true; 70 } 71 } 72 return false; 73 } 74 75 @Override apply(GraphBuilderContext builder, ResolvedJavaType type, Supplier<FrameState> frameState, ValueNode[] classInit)76 public boolean apply(GraphBuilderContext builder, ResolvedJavaType type, Supplier<FrameState> frameState, ValueNode[] classInit) { 77 if (shouldApply(builder, type)) { 78 Stamp hubStamp = builder.getStampProvider().createHubStamp((ObjectStamp) StampFactory.objectNonNull()); 79 ConstantNode hub = builder.append(ConstantNode.forConstant(hubStamp, ((HotSpotResolvedObjectType) type).klass(), builder.getMetaAccess(), builder.getGraph())); 80 DeoptimizingFixedWithNextNode result = builder.append(type.isArray() ? new ResolveConstantNode(hub) : new InitializeKlassNode(hub)); 81 result.setStateBefore(frameState.get()); 82 if (classInit != null) { 83 classInit[0] = result; 84 } 85 return true; 86 } 87 return false; 88 } 89 90 private static final Class<? extends ConstantPool> hscp; 91 private static final MethodHandle loadReferencedTypeIIZMH; 92 93 static { 94 MethodHandle m = null; 95 Class<? extends ConstantPool> c = null; 96 try { 97 c = Class.forName("jdk.vm.ci.hotspot.HotSpotConstantPool").asSubclass(ConstantPool.class); 98 m = MethodHandles.lookup().findVirtual(c, "loadReferencedType", MethodType.methodType(void.class, int.class, int.class, boolean.class)); 99 } catch (Exception e) { 100 } 101 loadReferencedTypeIIZMH = m; 102 hscp = c; 103 } 104 isHotSpotConstantPool(ConstantPool cp)105 private static boolean isHotSpotConstantPool(ConstantPool cp) { 106 // jdk.vm.ci.hotspot.HotSpotConstantPool is final, so we can 107 // directly compare Classes. 108 return cp.getClass() == hscp; 109 } 110 111 @Override supportsLazyInitialization(ConstantPool cp)112 public boolean supportsLazyInitialization(ConstantPool cp) { 113 if (loadReferencedTypeIIZMH != null && isHotSpotConstantPool(cp)) { 114 return true; 115 } 116 return false; 117 } 118 119 @Override loadReferencedType(GraphBuilderContext builder, ConstantPool cp, int cpi, int opcode)120 public void loadReferencedType(GraphBuilderContext builder, ConstantPool cp, int cpi, int opcode) { 121 if (loadReferencedTypeIIZMH != null && isHotSpotConstantPool(cp)) { 122 try { 123 loadReferencedTypeIIZMH.invoke(cp, cpi, opcode, false); 124 } catch (Throwable t) { 125 throw GraalError.shouldNotReachHere(t); 126 } 127 } else { 128 cp.loadReferencedType(cpi, opcode); 129 } 130 } 131 132 } 133