--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/jvmci/jdk.vm.ci.hotspot/src/jdk/vm/ci/hotspot/HotSpotObjectConstantImpl.java	Thu Oct 08 17:28:41 2015 -0700
@@ -0,0 +1,284 @@
+/*
+ * Copyright (c) 2009, 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.HotSpotResolvedObjectTypeImpl.fromObjectClass;
+
+import java.lang.invoke.CallSite;
+import java.lang.invoke.ConstantCallSite;
+import java.lang.invoke.MethodHandle;
+
+import jdk.vm.ci.inittimer.SuppressFBWarnings;
+import jdk.vm.ci.meta.Assumptions;
+import jdk.vm.ci.meta.Constant;
+import jdk.vm.ci.meta.JavaConstant;
+import jdk.vm.ci.meta.JavaKind;
+import jdk.vm.ci.meta.ResolvedJavaType;
+
+/**
+ * Represents a constant non-{@code null} object reference, within the compiler and across the
+ * compiler/runtime interface.
+ */
+final class HotSpotObjectConstantImpl implements HotSpotObjectConstant, HotSpotProxified {
+
+    static JavaConstant forObject(Object object) {
+        return forObject(object, false);
+    }
+
+    static JavaConstant forObject(Object object, boolean compressed) {
+        if (object == null) {
+            return compressed ? HotSpotCompressedNullConstant.COMPRESSED_NULL : JavaConstant.NULL_POINTER;
+        } else {
+            return new HotSpotObjectConstantImpl(object, compressed);
+        }
+    }
+
+    static JavaConstant forStableArray(Object object, int stableDimension, boolean isDefaultStable) {
+        if (object == null) {
+            return JavaConstant.NULL_POINTER;
+        } else {
+            assert object.getClass().isArray();
+            return new HotSpotObjectConstantImpl(object, false, stableDimension, isDefaultStable);
+        }
+    }
+
+    public static JavaConstant forBoxedValue(JavaKind kind, Object value) {
+        if (kind == JavaKind.Object) {
+            return HotSpotObjectConstantImpl.forObject(value);
+        } else {
+            return JavaConstant.forBoxedPrimitive(value);
+        }
+    }
+
+    static Object asBoxedValue(Constant constant) {
+        if (JavaConstant.isNull(constant)) {
+            return null;
+        } else if (constant instanceof HotSpotObjectConstantImpl) {
+            return ((HotSpotObjectConstantImpl) constant).object;
+        } else {
+            return ((JavaConstant) constant).asBoxedPrimitive();
+        }
+    }
+
+    private final Object object;
+    private final boolean compressed;
+    private final byte stableDimension;
+    private final boolean isDefaultStable;
+
+    private HotSpotObjectConstantImpl(Object object, boolean compressed, int stableDimension, boolean isDefaultStable) {
+        this.object = object;
+        this.compressed = compressed;
+        this.stableDimension = (byte) stableDimension;
+        this.isDefaultStable = isDefaultStable;
+        assert object != null;
+        assert stableDimension == 0 || (object != null && object.getClass().isArray());
+        assert stableDimension >= 0 && stableDimension <= 255;
+        assert !isDefaultStable || stableDimension > 0;
+    }
+
+    private HotSpotObjectConstantImpl(Object object, boolean compressed) {
+        this(object, compressed, 0, false);
+    }
+
+    @Override
+    public JavaKind getJavaKind() {
+        return JavaKind.Object;
+    }
+
+    /**
+     * Package-private accessor for the object represented by this constant.
+     */
+    Object object() {
+        return object;
+    }
+
+    public boolean isCompressed() {
+        return compressed;
+    }
+
+    public JavaConstant compress() {
+        assert !compressed;
+        return new HotSpotObjectConstantImpl(object, true, stableDimension, isDefaultStable);
+    }
+
+    public JavaConstant uncompress() {
+        assert compressed;
+        return new HotSpotObjectConstantImpl(object, false, stableDimension, isDefaultStable);
+    }
+
+    public HotSpotResolvedObjectType getType() {
+        return fromObjectClass(object.getClass());
+    }
+
+    public JavaConstant getClassLoader() {
+        if (object instanceof Class) {
+            /*
+             * This is an intrinsic for getClassLoader0, which occurs after any security checks. We
+             * can't call that directly so just call getClassLoader.
+             */
+            return HotSpotObjectConstantImpl.forObject(((Class<?>) object).getClassLoader());
+        }
+        return null;
+    }
+
+    public int getIdentityHashCode() {
+        return System.identityHashCode(object);
+    }
+
+    public JavaConstant getComponentType() {
+        if (object instanceof Class) {
+            return HotSpotObjectConstantImpl.forObject(((Class<?>) object).getComponentType());
+        }
+        return null;
+    }
+
+    public JavaConstant getSuperclass() {
+        if (object instanceof Class) {
+            return HotSpotObjectConstantImpl.forObject(((Class<?>) object).getSuperclass());
+        }
+        return null;
+    }
+
+    public JavaConstant getCallSiteTarget(Assumptions assumptions) {
+        if (object instanceof CallSite) {
+            CallSite callSite = (CallSite) object;
+            MethodHandle target = callSite.getTarget();
+            if (!(callSite instanceof ConstantCallSite)) {
+                if (assumptions == null) {
+                    return null;
+                }
+                assumptions.record(new Assumptions.CallSiteTargetValue(callSite, target));
+            }
+            return HotSpotObjectConstantImpl.forObject(target);
+        }
+        return null;
+    }
+
+    @SuppressFBWarnings(value = "ES_COMPARING_STRINGS_WITH_EQ", justification = "reference equality is what we want")
+    public boolean isInternedString() {
+        if (object instanceof String) {
+            String s = (String) object;
+            return s.intern() == s;
+        }
+        return false;
+    }
+
+    public <T> T asObject(Class<T> type) {
+        if (type.isInstance(object)) {
+            return type.cast(object);
+        }
+        return null;
+    }
+
+    public Object asObject(ResolvedJavaType type) {
+        if (type.isInstance(this)) {
+            return object;
+        }
+        return null;
+    }
+
+    @Override
+    public boolean isNull() {
+        return false;
+    }
+
+    @Override
+    public boolean isDefaultForKind() {
+        return false;
+    }
+
+    @Override
+    public Object asBoxedPrimitive() {
+        throw new IllegalArgumentException();
+    }
+
+    @Override
+    public int asInt() {
+        throw new IllegalArgumentException();
+    }
+
+    @Override
+    public boolean asBoolean() {
+        throw new IllegalArgumentException();
+    }
+
+    @Override
+    public long asLong() {
+        throw new IllegalArgumentException();
+    }
+
+    @Override
+    public float asFloat() {
+        throw new IllegalArgumentException();
+    }
+
+    @Override
+    public double asDouble() {
+        throw new IllegalArgumentException();
+    }
+
+    @Override
+    public int hashCode() {
+        return System.identityHashCode(object);
+    }
+
+    @Override
+    public boolean equals(Object o) {
+        if (o == this) {
+            return true;
+        } else if (o instanceof HotSpotObjectConstantImpl) {
+            HotSpotObjectConstantImpl other = (HotSpotObjectConstantImpl) o;
+            return object == other.object && compressed == other.compressed && stableDimension == other.stableDimension && isDefaultStable == other.isDefaultStable;
+        }
+        return false;
+    }
+
+    @Override
+    public String toValueString() {
+        if (object instanceof String) {
+            return "\"" + (String) object + "\"";
+        } else {
+            return JavaKind.Object.format(object);
+        }
+    }
+
+    @Override
+    public String toString() {
+        return (compressed ? "NarrowOop" : getJavaKind().getJavaName()) + "[" + JavaKind.Object.format(object) + "]";
+    }
+
+    /**
+     * Number of stable dimensions if this constant is a stable array.
+     */
+    public int getStableDimension() {
+        return stableDimension & 0xff;
+    }
+
+    /**
+     * Returns {@code true} if this is a stable array constant and its elements should be considered
+     * as stable regardless of whether they are default values.
+     */
+    public boolean isDefaultStable() {
+        return isDefaultStable;
+    }
+}