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 }