1 /*
   2  * Copyright (c) 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.meta;
  24 
  25 import org.graalvm.compiler.core.common.type.ObjectStamp;
  26 import org.graalvm.compiler.core.common.type.Stamp;
  27 import org.graalvm.compiler.core.common.type.StampFactory;
  28 import org.graalvm.compiler.hotspot.nodes.aot.InitializeKlassNode;
  29 import org.graalvm.compiler.hotspot.nodes.aot.ResolveConstantNode;
  30 import org.graalvm.compiler.nodes.ConstantNode;
  31 import org.graalvm.compiler.nodes.DeoptimizingFixedWithNextNode;
  32 import org.graalvm.compiler.nodes.FrameState;
  33 import org.graalvm.compiler.nodes.ValueNode;
  34 import org.graalvm.compiler.nodes.graphbuilderconf.ClassInitializationPlugin;
  35 import org.graalvm.compiler.nodes.graphbuilderconf.GraphBuilderContext;
  36 
  37 import jdk.vm.ci.hotspot.HotSpotResolvedObjectType;
  38 import jdk.vm.ci.meta.ResolvedJavaMethod;
  39 import jdk.vm.ci.meta.ResolvedJavaType;
  40 
  41 public final class HotSpotClassInitializationPlugin implements ClassInitializationPlugin {
  42     @Override
  43     public boolean shouldApply(GraphBuilderContext builder, ResolvedJavaType type) {
  44         if (!builder.parsingIntrinsic()) {
  45             if (!type.isArray()) {
  46                 ResolvedJavaMethod method = builder.getGraph().method();
  47                 ResolvedJavaType methodHolder = method.getDeclaringClass();
  48                 // We can elide initialization nodes if type >=: methodHolder.
  49                 // The type is already initialized by either "new" or "invokestatic".
  50 
  51                 // Emit initialization node if type is an interface since:
  52                 // JLS 12.4: Before a class is initialized, its direct superclass must be
  53                 // initialized, but interfaces implemented by the class are not
  54                 // initialized and a class or interface type T will be initialized
  55                 // immediately before the first occurrence of accesses listed
  56                 // in JLS 12.4.1.
  57 
  58                 return !type.isAssignableFrom(methodHolder) || type.isInterface();
  59             } else if (!type.getComponentType().isPrimitive()) {
  60                 // Always apply to object array types
  61                 return true;
  62             }
  63         }
  64         return false;
  65     }
  66 
  67     @Override
  68     public ValueNode apply(GraphBuilderContext builder, ResolvedJavaType type, FrameState frameState) {
  69         assert shouldApply(builder, type);
  70         Stamp hubStamp = builder.getStampProvider().createHubStamp((ObjectStamp) StampFactory.objectNonNull());
  71         ConstantNode hub = builder.append(ConstantNode.forConstant(hubStamp, ((HotSpotResolvedObjectType) type).klass(), builder.getMetaAccess(), builder.getGraph()));
  72         DeoptimizingFixedWithNextNode result = builder.append(type.isArray() ? new ResolveConstantNode(hub) : new InitializeKlassNode(hub));
  73         result.setStateBefore(frameState);
  74         return result;
  75     }
  76 }