Mercurial > hg > graal-jvmci-8
view jvmci/jdk.vm.ci.hotspot/src/jdk/vm/ci/hotspot/HotSpotResolvedJavaFieldImpl.java @ 23996:11f0412408cd
8173912: [JVMCI] fix memory overhead of JVMCI
author | Doug Simon <doug.simon@oracle.com> |
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date | Fri, 03 Feb 2017 21:08:05 +0100 |
parents | 115d4e0d7b87 |
children | 9a740aa0d87b |
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/* * Copyright (c) 2011, 2017, 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 static jdk.vm.ci.hotspot.HotSpotModifiers.jvmFieldModifiers; import static jdk.vm.ci.hotspot.HotSpotVMConfig.config; import java.lang.annotation.Annotation; import java.lang.reflect.Field; import jdk.vm.ci.meta.JavaType; import jdk.vm.ci.meta.ResolvedJavaType; /** * Represents a field in a HotSpot type. */ class HotSpotResolvedJavaFieldImpl implements HotSpotResolvedJavaField { private final HotSpotResolvedObjectTypeImpl holder; private JavaType type; private final int offset; private final short index; /** * This value contains all flags as stored in the VM including internal ones. */ private final int modifiers; HotSpotResolvedJavaFieldImpl(HotSpotResolvedObjectTypeImpl holder, JavaType type, long offset, int modifiers, int index) { this.holder = holder; this.type = type; this.index = (short) index; this.offset = (int) offset; this.modifiers = modifiers; assert this.index == index; assert offset != -1; assert offset == (int) offset : "offset larger than int"; } @Override public boolean equals(Object obj) { if (this == obj) { return true; } if (obj instanceof HotSpotResolvedJavaField) { HotSpotResolvedJavaFieldImpl that = (HotSpotResolvedJavaFieldImpl) obj; if (that.offset != this.offset || that.isStatic() != this.isStatic()) { return false; } else if (this.holder.equals(that.holder)) { return true; } } return false; } @Override public int hashCode() { return offset ^ modifiers; } @Override public int getModifiers() { return modifiers & jvmFieldModifiers(); } @Override public boolean isInternal() { return (modifiers & config().jvmAccFieldInternal) != 0; } /** * Determines if a given object contains this field. * * @return true iff this is a non-static field and its declaring class is assignable from * {@code object}'s class */ public boolean isInObject(Object object) { if (isStatic()) { return false; } return getDeclaringClass().isAssignableFrom(HotSpotResolvedObjectTypeImpl.fromObjectClass(object.getClass())); } @Override public HotSpotResolvedObjectTypeImpl getDeclaringClass() { return holder; } @Override public String getName() { return holder.createFieldInfo(index).getName(); } @Override public JavaType getType() { // Pull field into local variable to prevent a race causing // a ClassCastException below JavaType currentType = type; if (currentType instanceof HotSpotUnresolvedJavaType) { // Don't allow unresolved types to hang around forever HotSpotUnresolvedJavaType unresolvedType = (HotSpotUnresolvedJavaType) currentType; ResolvedJavaType resolved = unresolvedType.reresolve(holder); if (resolved != null) { type = resolved; } } return type; } public int offset() { return offset; } @Override public String toString() { return format("HotSpotField<%H.%n %t:") + offset + ">"; } @Override public boolean isSynthetic() { return (config().syntheticFlag & modifiers) != 0; } /** * Checks if this field has the {@link Stable} annotation. * * @return true if field has {@link Stable} annotation, false otherwise */ public boolean isStable() { return (config().jvmAccFieldStable & modifiers) != 0; } @Override public Annotation[] getAnnotations() { Field javaField = toJava(); if (javaField != null) { return javaField.getAnnotations(); } return new Annotation[0]; } @Override public Annotation[] getDeclaredAnnotations() { Field javaField = toJava(); if (javaField != null) { return javaField.getDeclaredAnnotations(); } return new Annotation[0]; } @Override public <T extends Annotation> T getAnnotation(Class<T> annotationClass) { Field javaField = toJava(); if (javaField != null) { return javaField.getAnnotation(annotationClass); } return null; } private Field toJava() { if (isInternal()) { return null; } try { return holder.mirror().getDeclaredField(getName()); } catch (NoSuchFieldException | NoClassDefFoundError e) { return null; } } }