Mercurial > hg > graal-compiler
view graal/com.oracle.jvmci.hotspot/src/com/oracle/jvmci/hotspot/HotSpotConstantReflectionProvider.java @ 21744:d62a384b2415
improved formatting of snippet counters
author | Doug Simon <doug.simon@oracle.com> |
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date | Fri, 05 Jun 2015 11:58:49 +0200 |
parents | 2081f8f294fe |
children |
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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 com.oracle.jvmci.hotspot; import static com.oracle.jvmci.hotspot.HotSpotConstantReflectionProvider.Options.*; import java.lang.reflect.*; import com.oracle.jvmci.meta.*; import com.oracle.jvmci.options.*; /** * HotSpot implementation of {@link ConstantReflectionProvider}. */ public class HotSpotConstantReflectionProvider implements ConstantReflectionProvider, HotSpotProxified { static class Options { //@formatter:off @Option(help = "Constant fold final fields with default values.", type = OptionType.Debug) public static final OptionValue<Boolean> TrustFinalDefaultFields = new OptionValue<>(true); //@formatter:on } 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 x.equals(y); } } @Override public Integer readArrayLength(JavaConstant array) { if (array.getKind() != Kind.Object || array.isNull()) { return null; } Object arrayObject = ((HotSpotObjectConstantImpl) array).object(); if (!arrayObject.getClass().isArray()) { return null; } return Array.getLength(arrayObject); } public JavaConstant readConstantArrayElement(JavaConstant array, int index) { if (array instanceof HotSpotObjectConstantImpl && ((HotSpotObjectConstantImpl) array).getStableDimension() > 0) { JavaConstant element = readArrayElement(array, index); if (element != null && (((HotSpotObjectConstantImpl) array).isDefaultStable() || !element.isDefaultForKind())) { return element; } } return null; } /** * Try to convert {@code offset} into an an index into {@code array}. * * @return the computed index or -1 if the offset isn't within the array */ private int indexForOffset(JavaConstant array, long offset) { if (array.getKind() != Kind.Object || array.isNull()) { return -1; } Class<?> componentType = ((HotSpotObjectConstantImpl) array).object().getClass().getComponentType(); Kind kind = runtime.getHostJVMCIBackend().getMetaAccess().lookupJavaType(componentType).getKind(); int arraybase = runtime.getArrayBaseOffset(kind); int scale = runtime.getArrayIndexScale(kind); if (offset < arraybase) { return -1; } long index = offset - arraybase; if (index % scale != 0) { return -1; } long result = index / scale; if (result >= Integer.MAX_VALUE) { return -1; } return (int) result; } public JavaConstant readConstantArrayElementForOffset(JavaConstant array, long offset) { if (array instanceof HotSpotObjectConstantImpl && ((HotSpotObjectConstantImpl) array).getStableDimension() > 0) { return readConstantArrayElement(array, indexForOffset(array, offset)); } return null; } @Override public JavaConstant readArrayElement(JavaConstant array, int index) { if (array.getKind() != Kind.Object || array.isNull()) { return null; } Object a = ((HotSpotObjectConstantImpl) array).object(); if (index < 0 || index >= Array.getLength(a)) { return null; } if (a instanceof Object[]) { Object element = ((Object[]) a)[index]; if (((HotSpotObjectConstantImpl) array).getStableDimension() > 1) { return HotSpotObjectConstantImpl.forStableArray(element, ((HotSpotObjectConstantImpl) array).getStableDimension() - 1, ((HotSpotObjectConstantImpl) array).isDefaultStable()); } else { 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.getKind()) { 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.getKind()); } } @Override public JavaConstant boxPrimitive(JavaConstant source) { if (!source.getKind().isPrimitive() || !isBoxCached(source)) { return null; } return HotSpotObjectConstantImpl.forObject(source.asBoxedPrimitive()); } @Override public JavaConstant unboxPrimitive(JavaConstant source) { if (!source.getKind().isObject()) { return null; } if (source.isNull()) { return null; } return JavaConstant.forBoxedPrimitive(((HotSpotObjectConstantImpl) source).object()); } public JavaConstant forString(String 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) { Object obj = HotSpotMetaspaceConstantImpl.getMetaspaceObject(constant); if (obj instanceof HotSpotResolvedObjectTypeImpl) { return (ResolvedJavaType) obj; } } return null; } private static final String SystemClassName = "Ljava/lang/System;"; /** * Determines if a static field is constant for the purpose of * {@link #readConstantFieldValue(JavaField, JavaConstant)}. */ protected boolean isStaticFieldConstant(HotSpotResolvedJavaField staticField) { if (staticField.isFinal() || staticField.isStable()) { ResolvedJavaType holder = staticField.getDeclaringClass(); if (holder.isInitialized() && !holder.getName().equals(SystemClassName)) { return true; } } return false; } /** * Determines if a value read from a {@code final} instance field is considered constant. The * implementation in {@link HotSpotConstantReflectionProvider} returns true if {@code value} is * not the {@link JavaConstant#isDefaultForKind default value} for its kind or if * {@link Options#TrustFinalDefaultFields} is true. * * @param value a value read from a {@code final} instance field * @param receiverClass the {@link Object#getClass() class} of object from which the * {@code value} was read */ protected boolean isFinalInstanceFieldValueConstant(JavaConstant value, Class<?> receiverClass) { return !value.isDefaultForKind() || TrustFinalDefaultFields.getValue(); } /** * Determines if a value read from a {@link Stable} instance field is considered constant. The * implementation in {@link HotSpotConstantReflectionProvider} returns true if {@code value} is * not the {@link JavaConstant#isDefaultForKind default value} for its kind. * * @param value a value read from a {@link Stable} field * @param receiverClass the {@link Object#getClass() class} of object from which the * {@code value} was read */ protected boolean isStableInstanceFieldValueConstant(JavaConstant value, Class<?> receiverClass) { return !value.isDefaultForKind(); } /** * {@inheritDoc} * <p> * The {@code value} field in {@link OptionValue} is considered constant if the type of * {@code receiver} is (assignable to) {@link StableOptionValue}. */ public JavaConstant readConstantFieldValue(JavaField field, JavaConstant receiver) { HotSpotResolvedJavaField hotspotField = (HotSpotResolvedJavaField) field; if (hotspotField.isStatic()) { if (isStaticFieldConstant(hotspotField)) { JavaConstant value = readFieldValue(field, receiver); if (hotspotField.isFinal() || !value.isDefaultForKind()) { return value; } } } else { /* * for non-static final fields, we must assume that they are only initialized if they * have a non-default value. */ Object object = receiver.isNull() ? null : ((HotSpotObjectConstantImpl) receiver).object(); // Canonicalization may attempt to process an unsafe read before // processing a guard (e.g. a null check or a type check) for this read // so we need to check the object being read if (object != null) { if (hotspotField.isFinal()) { if (hotspotField.isInObject(object)) { JavaConstant value = readFieldValue(field, receiver); if (isFinalInstanceFieldValueConstant(value, object.getClass())) { return value; } } } else if (hotspotField.isStable()) { if (hotspotField.isInObject(object)) { JavaConstant value = readFieldValue(field, receiver); if (isStableInstanceFieldValueConstant(value, object.getClass())) { return value; } } } else { Class<?> clazz = object.getClass(); if (StableOptionValue.class.isAssignableFrom(clazz)) { if (hotspotField.isInObject(object) && hotspotField.getName().equals("value")) { StableOptionValue<?> option = (StableOptionValue<?>) object; return HotSpotObjectConstantImpl.forObject(option.getValue()); } } } } } return null; } public JavaConstant readFieldValue(JavaField field, JavaConstant receiver) { HotSpotResolvedJavaField hotspotField = (HotSpotResolvedJavaField) field; if (!hotspotField.isStable()) { return readNonStableFieldValue(field, receiver); } else { return readStableFieldValue(field, receiver, false); } } private JavaConstant readNonStableFieldValue(JavaField field, JavaConstant receiver) { HotSpotResolvedJavaField hotspotField = (HotSpotResolvedJavaField) field; if (hotspotField.isStatic()) { HotSpotResolvedJavaType holder = (HotSpotResolvedJavaType) hotspotField.getDeclaringClass(); if (holder.isInitialized()) { return memoryAccess.readUnsafeConstant(hotspotField.getKind(), HotSpotObjectConstantImpl.forObject(holder.mirror()), hotspotField.offset()); } } else { if (receiver.isNonNull() && hotspotField.isInObject(((HotSpotObjectConstantImpl) receiver).object())) { return memoryAccess.readUnsafeConstant(hotspotField.getKind(), receiver, hotspotField.offset()); } } return null; } public JavaConstant readStableFieldValue(JavaField field, JavaConstant receiver, boolean isDefaultStable) { JavaConstant fieldValue = readNonStableFieldValue(field, receiver); if (fieldValue.isNonNull()) { JavaType declaredType = field.getType(); if (declaredType.getComponentType() != null) { int stableDimension = getArrayDimension(declaredType); return HotSpotObjectConstantImpl.forStableArray(((HotSpotObjectConstantImpl) fieldValue).object(), stableDimension, isDefaultStable); } } return fieldValue; } private static int getArrayDimension(JavaType type) { int dimensions = 0; JavaType componentType = type; while ((componentType = componentType.getComponentType()) != null) { dimensions++; } return dimensions; } }