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/*
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* Copyright (c) 2011, 2017, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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package jdk.vm.ci.hotspot;
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import static jdk.vm.ci.hotspot.HotSpotModifiers.jvmFieldModifiers;
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import static jdk.vm.ci.hotspot.HotSpotVMConfig.config;
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import java.lang.annotation.Annotation;
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import java.lang.reflect.Field;
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import jdk.internal.vm.annotation.Stable;
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import jdk.vm.ci.meta.JavaType;
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import jdk.vm.ci.meta.ResolvedJavaType;
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/**
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* Represents a field in a HotSpot type.
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*/
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class HotSpotResolvedJavaFieldImpl implements HotSpotResolvedJavaField {
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private final HotSpotResolvedObjectTypeImpl holder;
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private JavaType type;
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private final int offset;
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private final short index;
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/**
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* This value contains all flags as stored in the VM including internal ones.
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*/
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private final int modifiers;
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HotSpotResolvedJavaFieldImpl(HotSpotResolvedObjectTypeImpl holder, JavaType type, long offset, int modifiers, int index) {
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this.holder = holder;
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this.type = type;
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this.index = (short) index;
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assert this.index == index;
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assert offset != -1;
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assert offset == (int) offset : "offset larger than int";
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this.offset = (int) offset;
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this.modifiers = modifiers;
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}
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@Override
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public boolean equals(Object obj) {
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if (this == obj) {
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return true;
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}
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if (obj instanceof HotSpotResolvedJavaField) {
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HotSpotResolvedJavaFieldImpl that = (HotSpotResolvedJavaFieldImpl) obj;
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if (that.offset != this.offset || that.isStatic() != this.isStatic()) {
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return false;
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} else if (this.holder.equals(that.holder)) {
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return true;
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}
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}
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return false;
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}
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@Override
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public int hashCode() {
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return offset ^ modifiers;
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}
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@Override
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public int getModifiers() {
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return modifiers & jvmFieldModifiers();
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}
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@Override
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public boolean isInternal() {
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return (modifiers & config().jvmAccFieldInternal) != 0;
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}
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/**
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* Determines if a given object contains this field.
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*
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* @return true iff this is a non-static field and its declaring class is assignable from
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* {@code object}'s class
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*/
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public boolean isInObject(Object object) {
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if (isStatic()) {
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return false;
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}
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return getDeclaringClass().isAssignableFrom(HotSpotResolvedObjectTypeImpl.fromObjectClass(object.getClass()));
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}
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@Override
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public HotSpotResolvedObjectTypeImpl getDeclaringClass() {
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return holder;
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}
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@Override
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public String getName() {
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return holder.createFieldInfo(index).getName();
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}
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@Override
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public JavaType getType() {
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// Pull field into local variable to prevent a race causing
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// a ClassCastException below
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JavaType currentType = type;
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if (currentType instanceof HotSpotUnresolvedJavaType) {
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// Don't allow unresolved types to hang around forever
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HotSpotUnresolvedJavaType unresolvedType = (HotSpotUnresolvedJavaType) currentType;
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ResolvedJavaType resolved = unresolvedType.reresolve(holder);
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if (resolved != null) {
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type = resolved;
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}
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}
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return type;
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}
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public int offset() {
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return offset;
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}
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@Override
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public String toString() {
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return format("HotSpotField<%H.%n %t:") + offset + ">";
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}
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@Override
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public boolean isSynthetic() {
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return (config().jvmAccSynthetic & modifiers) != 0;
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}
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/**
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* Checks if this field has the {@link Stable} annotation.
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*
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* @return true if field has {@link Stable} annotation, false otherwise
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*/
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public boolean isStable() {
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return (config().jvmAccFieldStable & modifiers) != 0;
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}
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@Override
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public Annotation[] getAnnotations() {
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Field javaField = toJava();
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if (javaField != null) {
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return javaField.getAnnotations();
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}
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return new Annotation[0];
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}
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@Override
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public Annotation[] getDeclaredAnnotations() {
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Field javaField = toJava();
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if (javaField != null) {
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return javaField.getDeclaredAnnotations();
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}
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return new Annotation[0];
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}
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@Override
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public <T extends Annotation> T getAnnotation(Class<T> annotationClass) {
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Field javaField = toJava();
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if (javaField != null) {
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return javaField.getAnnotation(annotationClass);
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}
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return null;
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}
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private Field toJava() {
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if (isInternal()) {
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return null;
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}
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try {
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return holder.mirror().getDeclaredField(getName());
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} catch (NoSuchFieldException | NoClassDefFoundError e) {
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return null;
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}
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}
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}
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