--- /dev/null	2019-03-28 11:25:02.000000000 -0700
+++ new/src/jdk.internal.vm.ci/share/classes/jdk.vm.ci.hotspot/src/jdk/vm/ci/hotspot/HotSpotJVMCIUnsupportedOperationError.java	2019-03-28 11:25:01.000000000 -0700
@@ -0,0 +1,55 @@
+/*
+ * Copyright (c) 2018, 2019, 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 jdk.vm.ci.meta.ResolvedJavaType;
+import jdk.vm.ci.services.Services;
+
+/**
+ * Indicates a path in HotSpot JVMCI related code that is unsupported in the current execution
+ * environment. For example, certain operations are not supported by JVMCI code running in an ahead
+ * of time compiled {@linkplain Services#IS_IN_NATIVE_IMAGE native image}. This usually reflects
+ * functionality only needed in non-native image execution that would require a more complex
+ * implementation to support in a native image.
+ *
+ * An example of such functionality is {@link ResolvedJavaType#isLocal()}. This can be conveniently
+ * implemented when JVMCI is running on the HotSpot heap as we can obtain the {@link Class} mirror
+ * for the {@link ResolvedJavaType} and call {@link Class#isLocalClass()}. In a native image, there
+ * is no {@link Class} mirror available in the native image heap so implementing this would involve
+ * a call into VM native code that in turn would make an upcall into Java code executing on the
+ * HotSpot heap. We have opted to defer implementing functionality such as this until there's a
+ * demonstrated need for it.
+ */
+public class HotSpotJVMCIUnsupportedOperationError extends Error {
+
+    public HotSpotJVMCIUnsupportedOperationError(String reason) {
+        super(reason);
+    }
+
+    public HotSpotJVMCIUnsupportedOperationError(String reason, Throwable cause) {
+        super(reason, cause);
+    }
+
+    private static final long serialVersionUID = 7782431672678016392L;
+
+}