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 }