--- /dev/null	2016-05-31 09:42:47.975716356 -0700
+++ new/src/jdk.vm.compiler/share/classes/org.graalvm.compiler.replacements.verifier/src/org/graalvm/compiler/replacements/verifier/AbstractVerifier.java	2016-12-09 00:56:54.823950911 -0800
@@ -0,0 +1,100 @@
+/*
+ * Copyright (c) 2013, 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 org.graalvm.compiler.replacements.verifier;
+
+import java.lang.annotation.Annotation;
+import java.lang.reflect.Array;
+import java.util.ArrayList;
+import java.util.List;
+
+import javax.annotation.processing.ProcessingEnvironment;
+import javax.lang.model.element.AnnotationMirror;
+import javax.lang.model.element.AnnotationValue;
+import javax.lang.model.element.Element;
+import javax.lang.model.element.ExecutableElement;
+import javax.lang.model.type.TypeMirror;
+import javax.lang.model.util.ElementFilter;
+
+public abstract class AbstractVerifier {
+
+    protected final ProcessingEnvironment env;
+
+    public AbstractVerifier(ProcessingEnvironment env) {
+        this.env = env;
+    }
+
+    public abstract void verify(Element element, AnnotationMirror annotation, PluginGenerator generator);
+
+    public abstract Class<? extends Annotation> getAnnotationClass();
+
+    @SuppressWarnings("unchecked")
+    protected static <T> T resolveAnnotationValue(Class<T> expectedType, AnnotationValue value) {
+        if (value == null) {
+            return null;
+        }
+        if (expectedType.isArray()) {
+            ArrayList<Object> result = new ArrayList<>();
+            List<AnnotationValue> l = (List<AnnotationValue>) value.getValue();
+            for (AnnotationValue el : l) {
+                result.add(resolveAnnotationValue(expectedType.getComponentType(), el));
+            }
+            return (T) result.toArray((Object[]) Array.newInstance(expectedType.getComponentType(), result.size()));
+        }
+        Object unboxedValue = value.getValue();
+        if (unboxedValue != null) {
+            if (expectedType == TypeMirror.class && unboxedValue instanceof String) {
+                /*
+                 * Happens if type is invalid when using the ECJ compiler. The ECJ does not match
+                 * AP-API specification here.
+                 */
+                return null;
+            }
+            if (!expectedType.isAssignableFrom(unboxedValue.getClass())) {
+                throw new ClassCastException(unboxedValue.getClass().getName() + " not assignable from " + expectedType.getName());
+            }
+        }
+        return (T) unboxedValue;
+    }
+
+    protected static AnnotationValue findAnnotationValue(AnnotationMirror mirror, String name) {
+        ExecutableElement valueMethod = null;
+        for (ExecutableElement method : ElementFilter.methodsIn(mirror.getAnnotationType().asElement().getEnclosedElements())) {
+            if (method.getSimpleName().toString().equals(name)) {
+                valueMethod = method;
+                break;
+            }
+        }
+
+        if (valueMethod == null) {
+            return null;
+        }
+
+        AnnotationValue value = mirror.getElementValues().get(valueMethod);
+        if (value == null) {
+            value = valueMethod.getDefaultValue();
+        }
+
+        return value;
+    }
+
+}