--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/jdk.internal.vm.compiler/share/classes/org.graalvm.compiler.core.test/src/org/graalvm/compiler/core/test/VerifyInstanceOfUsage.java	Sat Dec 08 00:56:10 2018 -0800
@@ -0,0 +1,93 @@
+/*
+ * Copyright (c) 2017, 2018, 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.core.test;
+
+import org.graalvm.compiler.lir.StandardOp.LoadConstantOp;
+import org.graalvm.compiler.lir.StandardOp.MoveOp;
+import org.graalvm.compiler.lir.StandardOp.ValueMoveOp;
+import org.graalvm.compiler.nodes.StructuredGraph;
+import org.graalvm.compiler.nodes.java.InstanceOfNode;
+import org.graalvm.compiler.phases.VerifyPhase;
+import org.graalvm.compiler.phases.tiers.PhaseContext;
+
+import jdk.vm.ci.meta.MetaAccessProvider;
+import jdk.vm.ci.meta.ResolvedJavaMethod;
+import jdk.vm.ci.meta.ResolvedJavaType;
+
+/**
+ * Checks that we do not use {@code instanceof} for types where faster alternatives are available.
+ */
+public class VerifyInstanceOfUsage extends VerifyPhase<PhaseContext> {
+
+    private static final Class<?>[] FORBIDDEN_INSTANCE_OF_CHECKS = {
+                    MoveOp.class,
+                    ValueMoveOp.class,
+                    LoadConstantOp.class
+    };
+
+    @Override
+    public boolean checkContract() {
+        return false;
+    }
+
+    @Override
+    protected boolean verify(StructuredGraph graph, PhaseContext context) {
+        final ResolvedJavaType[] bailoutType = new ResolvedJavaType[FORBIDDEN_INSTANCE_OF_CHECKS.length];
+        for (int i = 0; i < FORBIDDEN_INSTANCE_OF_CHECKS.length; i++) {
+            bailoutType[i] = context.getMetaAccess().lookupJavaType(FORBIDDEN_INSTANCE_OF_CHECKS[i]);
+        }
+        ResolvedJavaMethod method = graph.method();
+        ResolvedJavaType declaringClass = method.getDeclaringClass();
+        if (!isTrustedInterface(declaringClass, context.getMetaAccess())) {
+
+            for (InstanceOfNode io : graph.getNodes().filter(InstanceOfNode.class)) {
+                ResolvedJavaType type = io.type().getType();
+                for (ResolvedJavaType forbiddenType : bailoutType) {
+                    if (forbiddenType.equals(type)) {
+                        String name = forbiddenType.getUnqualifiedName();
+                        // strip outer class
+                        ResolvedJavaType enclosingType = forbiddenType.getEnclosingType();
+                        if (enclosingType != null) {
+                            name = name.substring(enclosingType.getUnqualifiedName().length() + "$".length());
+                        }
+                        throw new VerificationError("Using `op instanceof %s` is not allowed. Use `%s.is%s(op)` instead. (in %s)", name, name, name, method.format("%H.%n(%p)"));
+                    }
+                }
+            }
+        }
+        return true;
+    }
+
+    private static boolean isTrustedInterface(ResolvedJavaType declaringClass, MetaAccessProvider metaAccess) {
+        for (Class<?> trustedCls : FORBIDDEN_INSTANCE_OF_CHECKS) {
+            ResolvedJavaType trusted = metaAccess.lookupJavaType(trustedCls);
+            if (trusted.equals(declaringClass)) {
+                return true;
+            }
+        }
+        return false;
+    }
+
+}