--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/jvmci/jdk.vm.ci.hotspot/src/jdk/vm/ci/hotspot/HotSpotResolvedJavaFieldImpl.java	Thu Oct 08 17:28:41 2015 -0700
@@ -0,0 +1,311 @@
+/*
+ * 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.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;
+import jdk.vm.ci.options.Option;
+import jdk.vm.ci.options.OptionType;
+import jdk.vm.ci.options.OptionValue;
+
+/**
+ * Represents a field in a HotSpot type.
+ */
+class HotSpotResolvedJavaFieldImpl implements HotSpotResolvedJavaField, HotSpotProxified {
+
+    static class Options {
+        //@formatter:off
+        @Option(help = "Mark well-known stable fields as such.", type = OptionType.Debug)
+        public static final OptionValue<Boolean> ImplicitStableValues = new OptionValue<>(true);
+        //@formatter:on
+    }
+
+    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;
+
+        public 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 (Options.ImplicitStableValues.getValue() && 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;
+    }
+}