Mercurial > hg > graal-jvmci-8
view jvmci/jdk.vm.ci.hotspot/src/jdk/vm/ci/hotspot/HotSpotConstantReflectionProvider.java @ 23686:50465926fbeb jvmci-0.12
make all HotSpotVMConfigAccess subclasses and their members package-private
remove toString methods from HotSpotVMConfigAccess subclasses
remove HotSpotVMConfigVerifier
author | Doug Simon <doug.simon@oracle.com> |
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date | Wed, 15 Jun 2016 15:29:38 +0200 |
parents | 3e8ce13f4e12 |
children | 2e9d95cef56b |
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/* * Copyright (c) 2011, 2015, Oracle and/or its affiliates. All rights reserved. * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. * * This code is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License version 2 only, as * published by the Free Software Foundation. * * This code is distributed in the hope that it will be useful, but WITHOUT * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License * version 2 for more details (a copy is included in the LICENSE file that * accompanied this code). * * You should have received a copy of the GNU General Public License version * 2 along with this work; if not, write to the Free Software Foundation, * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. * * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA * or visit www.oracle.com if you need additional information or have any * questions. */ package jdk.vm.ci.hotspot; import java.lang.reflect.Array; import java.util.Objects; import jdk.vm.ci.common.JVMCIError; import jdk.vm.ci.meta.Constant; import jdk.vm.ci.meta.ConstantReflectionProvider; import jdk.vm.ci.meta.JavaConstant; import jdk.vm.ci.meta.JavaKind; import jdk.vm.ci.meta.MemoryAccessProvider; import jdk.vm.ci.meta.MethodHandleAccessProvider; import jdk.vm.ci.meta.ResolvedJavaField; import jdk.vm.ci.meta.ResolvedJavaType; /** * HotSpot implementation of {@link ConstantReflectionProvider}. */ public class HotSpotConstantReflectionProvider implements ConstantReflectionProvider { protected final HotSpotJVMCIRuntimeProvider runtime; protected final HotSpotMethodHandleAccessProvider methodHandleAccess; protected final HotSpotMemoryAccessProviderImpl memoryAccess; public HotSpotConstantReflectionProvider(HotSpotJVMCIRuntimeProvider runtime) { this.runtime = runtime; this.methodHandleAccess = new HotSpotMethodHandleAccessProvider(this); this.memoryAccess = new HotSpotMemoryAccessProviderImpl(runtime); } public MethodHandleAccessProvider getMethodHandleAccess() { return methodHandleAccess; } @Override public MemoryAccessProvider getMemoryAccessProvider() { return memoryAccess; } @Override public Boolean constantEquals(Constant x, Constant y) { if (x == y) { return true; } else if (x instanceof HotSpotObjectConstantImpl) { return y instanceof HotSpotObjectConstantImpl && ((HotSpotObjectConstantImpl) x).object() == ((HotSpotObjectConstantImpl) y).object(); } else { return Objects.equals(x, y); } } @Override public Integer readArrayLength(JavaConstant array) { if (array == null || array.getJavaKind() != JavaKind.Object || array.isNull()) { return null; } Object arrayObject = ((HotSpotObjectConstantImpl) array).object(); if (!arrayObject.getClass().isArray()) { return null; } return Array.getLength(arrayObject); } @Override public JavaConstant readArrayElement(JavaConstant array, int index) { if (array == null || array.getJavaKind() != JavaKind.Object || array.isNull()) { return null; } Object a = ((HotSpotObjectConstantImpl) array).object(); if (!a.getClass().isArray() || index < 0 || index >= Array.getLength(a)) { return null; } if (a instanceof Object[]) { Object element = ((Object[]) a)[index]; return HotSpotObjectConstantImpl.forObject(element); } else { return JavaConstant.forBoxedPrimitive(Array.get(a, index)); } } /** * Check if the constant is a boxed value that is guaranteed to be cached by the platform. * Otherwise the generated code might be the only reference to the boxed value and since object * references from nmethods are weak this can cause GC problems. * * @param source * @return true if the box is cached */ private static boolean isBoxCached(JavaConstant source) { switch (source.getJavaKind()) { case Boolean: return true; case Char: return source.asInt() <= 127; case Byte: case Short: case Int: return source.asInt() >= -128 && source.asInt() <= 127; case Long: return source.asLong() >= -128 && source.asLong() <= 127; case Float: case Double: return false; default: throw new IllegalArgumentException("unexpected kind " + source.getJavaKind()); } } @Override public JavaConstant boxPrimitive(JavaConstant source) { if (source == null || !source.getJavaKind().isPrimitive() || !isBoxCached(source)) { return null; } return HotSpotObjectConstantImpl.forObject(source.asBoxedPrimitive()); } @Override public JavaConstant unboxPrimitive(JavaConstant source) { if (source == null || !source.getJavaKind().isObject()) { return null; } if (source.isNull()) { return null; } return JavaConstant.forBoxedPrimitive(((HotSpotObjectConstantImpl) source).object()); } public JavaConstant forString(String value) { return HotSpotObjectConstantImpl.forObject(value); } public JavaConstant forObject(Object value) { return HotSpotObjectConstantImpl.forObject(value); } @Override public ResolvedJavaType asJavaType(Constant constant) { if (constant instanceof HotSpotObjectConstant) { Object obj = ((HotSpotObjectConstantImpl) constant).object(); if (obj instanceof Class) { return runtime.getHostJVMCIBackend().getMetaAccess().lookupJavaType((Class<?>) obj); } } if (constant instanceof HotSpotMetaspaceConstant) { MetaspaceWrapperObject obj = HotSpotMetaspaceConstantImpl.getMetaspaceObject(constant); if (obj instanceof HotSpotResolvedObjectTypeImpl) { return (ResolvedJavaType) obj; } } return null; } public JavaConstant readFieldValue(ResolvedJavaField field, JavaConstant receiver) { HotSpotResolvedJavaField hotspotField = (HotSpotResolvedJavaField) field; if (hotspotField.isStatic()) { HotSpotResolvedJavaType holder = (HotSpotResolvedJavaType) hotspotField.getDeclaringClass(); if (holder.isInitialized()) { return memoryAccess.readUnsafeConstant(hotspotField.getJavaKind(), HotSpotObjectConstantImpl.forObject(holder.mirror()), hotspotField.offset()); } } else { if (receiver.isNonNull() && hotspotField.isInObject(((HotSpotObjectConstantImpl) receiver).object())) { return memoryAccess.readUnsafeConstant(hotspotField.getJavaKind(), receiver, hotspotField.offset()); } } return null; } @Override public JavaConstant asJavaClass(ResolvedJavaType type) { return HotSpotObjectConstantImpl.forObject(((HotSpotResolvedJavaType) type).mirror()); } @Override public Constant asObjectHub(ResolvedJavaType type) { if (type instanceof HotSpotResolvedObjectType) { return ((HotSpotResolvedObjectType) type).klass(); } else { throw JVMCIError.unimplemented(); } } }