1 /*
   2  * Copyright (c) 2013, 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.replacements;
  24 
  25 import static org.graalvm.compiler.hotspot.GraalHotSpotVMConfig.INJECTED_VMCONFIG;
  26 import static org.graalvm.compiler.hotspot.replacements.HotSpotReplacementsUtil.KLASS_ACCESS_FLAGS_LOCATION;
  27 import static org.graalvm.compiler.hotspot.replacements.HotSpotReplacementsUtil.jvmAccWrittenFlags;
  28 import static org.graalvm.compiler.hotspot.replacements.HotSpotReplacementsUtil.klassAccessFlagsOffset;
  29 
  30 import java.lang.reflect.Modifier;
  31 
  32 import org.graalvm.compiler.api.directives.GraalDirectives;
  33 import org.graalvm.compiler.api.replacements.ClassSubstitution;
  34 import org.graalvm.compiler.api.replacements.MethodSubstitution;
  35 import org.graalvm.compiler.hotspot.word.KlassPointer;
  36 
  37 /**
  38  * Substitutions for {@link sun.reflect.Reflection} methods.
  39  */
  40 @ClassSubstitution(className = {"jdk.internal.reflect.Reflection", "sun.reflect.Reflection"}, optional = true)
  41 public class ReflectionSubstitutions {
  42 
  43     @MethodSubstitution
  44     public static int getClassAccessFlags(Class<?> aClass) {
  45         KlassPointer klass = ClassGetHubNode.readClass(GraalDirectives.guardingNonNull(aClass));
  46         if (klass.isNull()) {
  47             // Class for primitive type
  48             return Modifier.ABSTRACT | Modifier.FINAL | Modifier.PUBLIC;
  49         } else {
  50             return klass.readInt(klassAccessFlagsOffset(INJECTED_VMCONFIG), KLASS_ACCESS_FLAGS_LOCATION) & jvmAccWrittenFlags(INJECTED_VMCONFIG);
  51         }
  52     }
  53 }