Mercurial > hg > graal-jvmci-8
view jvmci/jdk.vm.ci.hotspot/src/jdk/vm/ci/hotspot/HotSpotResolvedJavaFieldImpl.java @ 23357:b05ad394cfd5
Add ResolvedJavaType.isAllocationClonable
author | Tom Rodriguez <tom.rodriguez@oracle.com> |
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date | Thu, 28 Apr 2016 13:07:46 -0700 |
parents | 7b09dede4552 |
children | ae27c683c128 |
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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 static jdk.vm.ci.hotspot.HotSpotJVMCIRuntime.runtime; import static jdk.vm.ci.hotspot.HotSpotVMConfig.config; import java.lang.annotation.Annotation; import java.lang.reflect.Field; import jdk.vm.ci.common.JVMCIError; import jdk.vm.ci.hotspot.HotSpotJVMCIRuntime.Option; import jdk.vm.ci.meta.JavaType; import jdk.vm.ci.meta.LocationIdentity; import jdk.vm.ci.meta.MetaAccessProvider; import jdk.vm.ci.meta.ModifiersProvider; import jdk.vm.ci.meta.ResolvedJavaField; import jdk.vm.ci.meta.ResolvedJavaType; /** * Represents a field in a HotSpot type. */ class HotSpotResolvedJavaFieldImpl implements HotSpotResolvedJavaField, HotSpotProxified { private final HotSpotResolvedObjectTypeImpl holder; private final String name; private JavaType type; private final int offset; /** * This value contains all flags as stored in the VM including internal ones. */ private final int modifiers; private final LocationIdentity locationIdentity = new FieldLocationIdentity(this); public static class FieldLocationIdentity extends LocationIdentity { HotSpotResolvedJavaField inner; FieldLocationIdentity(HotSpotResolvedJavaFieldImpl inner) { this.inner = inner; } @Override public boolean isImmutable() { return false; } @Override public boolean equals(Object obj) { if (this == obj) { return true; } if (obj instanceof FieldLocationIdentity) { FieldLocationIdentity fieldLocationIdentity = (FieldLocationIdentity) obj; return inner.equals(fieldLocationIdentity.inner); } return false; } @Override public int hashCode() { return inner.hashCode(); } @Override public String toString() { return inner.getName(); } } HotSpotResolvedJavaFieldImpl(HotSpotResolvedObjectTypeImpl holder, String name, JavaType type, long offset, int modifiers) { this.holder = holder; this.name = name; this.type = type; assert offset != -1; assert offset == (int) offset : "offset larger than int"; this.offset = (int) offset; this.modifiers = modifiers; } @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)) { assert this.name.equals(that.name) && this.type.equals(that.type); return true; } } return false; } @Override public int hashCode() { return name.hashCode(); } @Override public int getModifiers() { return modifiers & ModifiersProvider.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 name; } @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() { if ((config().jvmAccFieldStable & modifiers) != 0) { return true; } assert getAnnotation(Stable.class) == null; if (Option.ImplicitStableValues.getBoolean() && isImplicitStableField()) { return true; } return false; } @Override public Annotation[] getAnnotations() { Field javaField = toJava(); if (javaField != null) { return javaField.getAnnotations(); } 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 toJavaCache; private Field toJava() { if (toJavaCache != null) { return toJavaCache; } if (isInternal()) { return null; } try { return toJavaCache = holder.mirror().getDeclaredField(name); } catch (NoSuchFieldException | NoClassDefFoundError e) { return null; } } private boolean isArray() { JavaType fieldType = getType(); return fieldType instanceof ResolvedJavaType && ((ResolvedJavaType) fieldType).isArray(); } private boolean isImplicitStableField() { if (isSyntheticEnumSwitchMap()) { return true; } if (isWellKnownImplicitStableField()) { return true; } return false; } public boolean isDefaultStable() { assert this.isStable(); if (isSyntheticEnumSwitchMap()) { return true; } return false; } private boolean isSyntheticEnumSwitchMap() { if (isSynthetic() && isStatic() && isArray()) { if (isFinal() && name.equals("$VALUES") || name.equals("ENUM$VALUES")) { // generated int[] field for EnumClass::values() return true; } else if (name.startsWith("$SwitchMap$") || name.startsWith("$SWITCH_TABLE$")) { // javac and ecj generate a static field in an inner class for a switch on an enum // named $SwitchMap$p$k$g$EnumClass and $SWITCH_TABLE$p$k$g$EnumClass, respectively return true; } } return false; } private boolean isWellKnownImplicitStableField() { return WellKnownImplicitStableField.test(this); } static class WellKnownImplicitStableField { /** * @return {@code true} if the field is a well-known stable field. */ public static boolean test(HotSpotResolvedJavaField field) { return field.equals(STRING_VALUE_FIELD); } private static final ResolvedJavaField STRING_VALUE_FIELD; static { try { MetaAccessProvider metaAccess = runtime().getHostJVMCIBackend().getMetaAccess(); STRING_VALUE_FIELD = metaAccess.lookupJavaField(String.class.getDeclaredField("value")); } catch (SecurityException | NoSuchFieldException e) { throw new JVMCIError(e); } } } public LocationIdentity getLocationIdentity() { return locationIdentity; } }