1 /*
   2  * Copyright (c) 2014, 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 static jdk.vm.ci.hotspot.HotSpotJVMCIRuntime.runtime;
  28 
  29 import org.graalvm.compiler.api.replacements.SnippetReflectionProvider;
  30 import org.graalvm.compiler.hotspot.GraalHotSpotVMConfig;
  31 import org.graalvm.compiler.hotspot.HotSpotGraalRuntimeProvider;
  32 import org.graalvm.compiler.word.WordTypes;
  33 
  34 import jdk.vm.ci.hotspot.HotSpotConstantReflectionProvider;
  35 import jdk.vm.ci.hotspot.HotSpotObjectConstant;
  36 import jdk.vm.ci.meta.JavaConstant;
  37 import jdk.vm.ci.meta.JavaKind;
  38 import jdk.vm.ci.meta.ResolvedJavaType;
  39 
  40 public class HotSpotSnippetReflectionProvider implements SnippetReflectionProvider {
  41 
  42     private final HotSpotGraalRuntimeProvider runtime;
  43     private final HotSpotConstantReflectionProvider constantReflection;
  44     private final WordTypes wordTypes;
  45 
  46     public HotSpotSnippetReflectionProvider(HotSpotGraalRuntimeProvider runtime, HotSpotConstantReflectionProvider constantReflection, WordTypes wordTypes) {
  47         this.runtime = runtime;
  48         this.constantReflection = constantReflection;
  49         this.wordTypes = wordTypes;
  50     }
  51 
  52     @Override
  53     public JavaConstant forObject(Object object) {
  54         return constantReflection.forObject(object);
  55     }
  56 
  57     @Override
  58     public <T> T asObject(Class<T> type, JavaConstant constant) {
  59         if (constant.isNull()) {
  60             return null;
  61         }
  62         if (constant instanceof HotSpotObjectConstant) {
  63             HotSpotObjectConstant hsConstant = (HotSpotObjectConstant) constant;
  64             return hsConstant.asObject(type);
  65         }
  66         return null;
  67     }
  68 
  69     @Override
  70     public JavaConstant forBoxed(JavaKind kind, Object value) {
  71         if (kind == JavaKind.Object) {
  72             return forObject(value);
  73         } else {
  74             return JavaConstant.forBoxedPrimitive(value);
  75         }
  76     }
  77 
  78     // Lazily initialized
  79     private Class<?> wordTypesType;
  80     private Class<?> runtimeType;
  81     private Class<?> configType;
  82 
  83     @Override
  84     public <T> T getInjectedNodeIntrinsicParameter(Class<T> type) {
  85         // Need to test all fields since there no guarantee under the JMM
  86         // about the order in which these fields are written.
  87         GraalHotSpotVMConfig config = runtime.getVMConfig();
  88         if (configType == null || wordTypesType == null || runtimeType == null) {
  89             wordTypesType = wordTypes.getClass();
  90             runtimeType = runtime.getClass();
  91             configType = config.getClass();
  92         }
  93 
  94         if (type.isAssignableFrom(wordTypesType)) {
  95             return type.cast(wordTypes);
  96         }
  97         if (type.isAssignableFrom(runtimeType)) {
  98             return type.cast(runtime);
  99         }
 100         if (type.isAssignableFrom(configType)) {
 101             return type.cast(config);
 102         }
 103         return null;
 104     }
 105 
 106     @Override
 107     public Class<?> originalClass(ResolvedJavaType type) {
 108         return runtime().getMirror(type);
 109     }
 110 }