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/*
* Copyright (c) 2012, 2019, 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. Oracle designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
* 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.svm.hosted.substitute;
import static com.oracle.svm.core.util.VMError.guarantee;
import static com.oracle.svm.core.util.VMError.shouldNotReachHere;
import java.lang.annotation.Annotation;
import java.lang.reflect.Constructor;
import java.lang.reflect.Field;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Modifier;
import java.util.EnumSet;
import java.util.concurrent.locks.ReentrantReadWriteLock;
import java.util.concurrent.locks.ReentrantReadWriteLock.ReadLock;
import java.util.concurrent.locks.ReentrantReadWriteLock.WriteLock;
import org.graalvm.collections.EconomicMap;
import org.graalvm.compiler.api.replacements.SnippetReflectionProvider;
import org.graalvm.compiler.serviceprovider.GraalUnsafeAccess;
import com.oracle.graal.pointsto.meta.AnalysisField;
import com.oracle.graal.pointsto.meta.AnalysisMetaAccess;
import com.oracle.svm.core.annotate.RecomputeFieldValue;
import com.oracle.svm.core.annotate.RecomputeFieldValue.CustomFieldValueComputer;
import com.oracle.svm.core.config.ConfigurationValues;
import com.oracle.svm.core.meta.ReadableJavaField;
import com.oracle.svm.core.util.VMError;
import com.oracle.svm.hosted.c.GraalAccess;
import com.oracle.svm.hosted.meta.HostedField;
import com.oracle.svm.hosted.meta.HostedMetaAccess;
import com.oracle.svm.util.ReflectionUtil;
import com.oracle.svm.util.ReflectionUtil.ReflectionUtilError;
import jdk.vm.ci.common.NativeImageReinitialize;
import jdk.vm.ci.meta.JavaConstant;
import jdk.vm.ci.meta.JavaKind;
import jdk.vm.ci.meta.JavaType;
import jdk.vm.ci.meta.ResolvedJavaField;
import jdk.vm.ci.meta.ResolvedJavaType;
import sun.misc.Unsafe;
/**
* Wraps a field whose value is recomputed when added to an image.
*
* @see RecomputeFieldValue
* @see NativeImageReinitialize
*/
public class ComputedValueField implements ReadableJavaField, ComputedValue {
private static final Unsafe UNSAFE = GraalUnsafeAccess.getUnsafe();
private final ResolvedJavaField original;
private final ResolvedJavaField annotated;
private final RecomputeFieldValue.Kind kind;
private final Class targetClass;
private final Field targetField;
private final boolean isFinal;
private JavaConstant constantValue;
private final EconomicMap valueCache;
/**
* Economic map does not allow to store null keys. Therefore null key is stored in an extra
* field.
*/
private JavaConstant valueCacheNullKey;
private final ReentrantReadWriteLock valueCacheLock = new ReentrantReadWriteLock();
private HostedMetaAccess hMetaAccess;
public ComputedValueField(ResolvedJavaField original, ResolvedJavaField annotated, RecomputeFieldValue.Kind kind, Class targetClass, String targetName, boolean isFinal) {
this.original = original;
this.annotated = annotated;
this.kind = kind;
this.targetClass = targetClass;
this.isFinal = isFinal;
Field f = null;
switch (kind) {
case Reset:
constantValue = JavaConstant.defaultForKind(getJavaKind());
break;
case FromAlias:
assert Modifier.isStatic(annotated.getModifiers()) : "Cannot use " + kind + " on non-static alias " + annotated.format("%H.%n");
annotated.getDeclaringClass().initialize();
constantValue = ReadableJavaField.readFieldValue(GraalAccess.getOriginalProviders().getConstantReflection(), annotated, null);
break;
case FieldOffset:
try {
f = targetClass.getDeclaredField(targetName);
} catch (NoSuchFieldException e) {
throw shouldNotReachHere("could not find target field " + targetClass.getName() + "." + targetName + " for alias " + annotated.format("%H.%n"));
}
break;
}
guarantee(!isFinal || isFinalValid(kind));
this.targetField = f;
this.valueCache = EconomicMap.create();
}
public static boolean isFinalValid(RecomputeFieldValue.Kind kind) {
EnumSet finalIllegal = EnumSet.of(RecomputeFieldValue.Kind.FieldOffset,
RecomputeFieldValue.Kind.TranslateFieldOffset, RecomputeFieldValue.Kind.AtomicFieldUpdaterOffset);
return !finalIllegal.contains(kind);
}
public ResolvedJavaField getAnnotated() {
return annotated;
}
@Override
public Field getTargetField() {
return targetField;
}
@Override
public RecomputeFieldValue.Kind getRecomputeValueKind() {
return kind;
}
@Override
public String getName() {
return original.getName();
}
@Override
public JavaType getType() {
return original.getType();
}
@Override
public int getModifiers() {
int result = original.getModifiers();
if (isFinal) {
result = result | Modifier.FINAL;
} else {
result = result & ~Modifier.FINAL;
}
return result;
}
@Override
public int getOffset() {
return original.getOffset();
}
@Override
public boolean isInternal() {
return original.isInternal();
}
@Override
public boolean isSynthetic() {
return original.isSynthetic();
}
public void processAnalysis(AnalysisMetaAccess aMetaAccess) {
switch (kind) {
case FieldOffset:
AnalysisField target = aMetaAccess.lookupJavaField(targetField);
target.registerAsAccessed();
break;
}
}
private JavaConstant asConstant(int value) {
switch (getJavaKind()) {
case Int:
return JavaConstant.forInt(value);
case Long:
return JavaConstant.forLong(value);
default:
throw shouldNotReachHere();
}
}
public void processSubstrate(HostedMetaAccess metaAccess) {
hMetaAccess = metaAccess;
switch (kind) {
case FieldOffset:
constantValue = asConstant(hMetaAccess.lookupJavaField(targetField).getLocation());
break;
}
}
@Override
public JavaConstant readValue(JavaConstant receiver) {
if (constantValue != null) {
return constantValue;
}
if (kind == RecomputeFieldValue.Kind.None || kind == RecomputeFieldValue.Kind.Manual) {
return ReadableJavaField.readFieldValue(GraalAccess.getOriginalProviders().getConstantReflection(), original, receiver);
}
JavaConstant result = getCached(receiver);
if (result != null) {
return result;
}
SnippetReflectionProvider originalSnippetReflection = GraalAccess.getOriginalSnippetReflection();
switch (kind) {
case ArrayBaseOffset:
constantValue = asConstant(ConfigurationValues.getObjectLayout().getArrayBaseOffset(JavaKind.fromJavaClass(targetClass.getComponentType())));
return constantValue;
case ArrayIndexScale:
constantValue = asConstant(ConfigurationValues.getObjectLayout().getArrayIndexScale(JavaKind.fromJavaClass(targetClass.getComponentType())));
return constantValue;
case ArrayIndexShift:
constantValue = asConstant(ConfigurationValues.getObjectLayout().getArrayIndexShift(JavaKind.fromJavaClass(targetClass.getComponentType())));
return constantValue;
case NewInstance:
try {
result = originalSnippetReflection.forObject(ReflectionUtil.newInstance(targetClass));
} catch (ReflectionUtilError ex) {
throw VMError.shouldNotReachHere("Error performing field recomputation for alias " + annotated.format("%H.%n"), ex.getCause());
}
break;
case AtomicFieldUpdaterOffset:
result = computeAtomicFieldUpdaterOffset(receiver);
break;
case TranslateFieldOffset:
result = translateFieldOffset(receiver, targetClass);
break;
case Custom:
try {
Constructor[] constructors = targetClass.getDeclaredConstructors();
if (constructors.length != 1) {
throw shouldNotReachHere("The " + CustomFieldValueComputer.class.getSimpleName() + " class " + targetClass.getName() + " has more than one constructor");
}
Constructor constructor = constructors[0];
Object[] constructorArgs = new Object[constructor.getParameterCount()];
for (int i = 0; i < constructorArgs.length; i++) {
constructorArgs[i] = configurationValue(constructor.getParameterTypes()[i]);
}
constructor.setAccessible(true);
CustomFieldValueComputer computer = (CustomFieldValueComputer) constructor.newInstance(constructorArgs);
Object receiverValue = receiver == null ? null : originalSnippetReflection.asObject(Object.class, receiver);
result = originalSnippetReflection.forBoxed(annotated.getJavaKind(), computer.compute(hMetaAccess, original, annotated, receiverValue));
assert result.getJavaKind() == annotated.getJavaKind();
} catch (InvocationTargetException | InstantiationException | IllegalAccessException ex) {
throw shouldNotReachHere("Error performing field recomputation for alias " + annotated.format("%H.%n"), ex);
}
break;
default:
throw shouldNotReachHere("Field recomputation of kind " + kind + " specified by alias " + annotated.format("%H.%n") + " not yet supported");
}
putCached(receiver, result);
return result;
}
private void putCached(JavaConstant receiver, JavaConstant result) {
WriteLock writeLock = valueCacheLock.writeLock();
try {
writeLock.lock();
if (receiver == null) {
valueCacheNullKey = result;
} else {
valueCache.put(receiver, result);
}
} finally {
writeLock.unlock();
}
}
private JavaConstant getCached(JavaConstant receiver) {
JavaConstant result;
ReadLock readLock = valueCacheLock.readLock();
try {
readLock.lock();
if (receiver == null) {
result = valueCacheNullKey;
} else {
result = valueCache.get(receiver);
}
} finally {
readLock.unlock();
}
return result;
}
@Override
public boolean allowConstantFolding() {
return getDeclaringClass().isInitialized() && isFinal;
}
@Override
public boolean injectFinalForRuntimeCompilation() {
if (original.isFinal()) {
/*
* We remove the "final" modifier for AOT compilation because the recomputed value is
* not guaranteed to be known yet. But for runtime compilation, we know that we can
* treat the field as "final".
*/
return true;
}
return ReadableJavaField.injectFinalForRuntimeCompilation(original);
}
private static Object configurationValue(Class clazz) {
throw shouldNotReachHere("Parameter type not supported yet: " + clazz.getName());
}
private JavaConstant translateFieldOffset(JavaConstant receiver, Class tclass) {
long searchOffset = ReadableJavaField.readFieldValue(GraalAccess.getOriginalProviders().getConstantReflection(), original, receiver).asLong();
// search the declared fields for a field with a matching offset
for (Field f : tclass.getDeclaredFields()) {
if (!Modifier.isStatic(f.getModifiers())) {
long fieldOffset = UNSAFE.objectFieldOffset(f);
if (fieldOffset == searchOffset) {
HostedField sf = hMetaAccess.lookupJavaField(f);
guarantee(sf.isAccessed() && sf.getLocation() > 0, "Field not marked as accessed: " + sf.format("%H.%n"));
return JavaConstant.forLong(sf.getLocation());
}
}
}
throw shouldNotReachHere("unknown field offset class: " + tclass + ", offset = " + searchOffset);
}
private JavaConstant computeAtomicFieldUpdaterOffset(JavaConstant receiver) {
assert !Modifier.isStatic(original.getModifiers());
assert receiver.isNonNull();
/*
* Explanation: java.util.concurrent is full of objects and classes that cache the offset of
* particular fields in the JDK. Here, AtomicFieldUpdater implementation objects cache
* the offset of some specified field. Which field? Oh...only Doug Lea knows that. We have
* to search the declaring class for a field that has the same "unsafe" offset as the cached
* offset in this atomic updater object.
*/
ResolvedJavaField tclassField = findField(original.getDeclaringClass(), "tclass");
SnippetReflectionProvider originalSnippetReflection = GraalAccess.getOriginalSnippetReflection();
Class tclass = originalSnippetReflection.asObject(Class.class, ReadableJavaField.readFieldValue(GraalAccess.getOriginalProviders().getConstantReflection(), tclassField, receiver));
return translateFieldOffset(receiver, tclass);
}
private static ResolvedJavaField findField(ResolvedJavaType declaringClass, String name) {
for (ResolvedJavaField field : declaringClass.getInstanceFields(false)) {
if (field.getName().equals(name)) {
return field;
}
}
throw shouldNotReachHere("Field not found: " + declaringClass.toJavaName(true) + "." + name);
}
@Override
public ResolvedJavaType getDeclaringClass() {
return original.getDeclaringClass();
}
@Override
public Annotation[] getAnnotations() {
return original.getAnnotations();
}
@Override
public Annotation[] getDeclaredAnnotations() {
return original.getDeclaredAnnotations();
}
@Override
public T getAnnotation(Class annotationClass) {
return original.getAnnotation(annotationClass);
}
@Override
public String toString() {
return "RecomputeValueField";
}
}