--- /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/GraphEncoderTest.java	Tue Sep 12 19:03:39 2017 +0200
@@ -0,0 +1,85 @@
+/*
+ * Copyright (c) 2015, 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.core.test;
+
+import java.lang.reflect.Method;
+import java.util.ArrayList;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+
+import jdk.vm.ci.meta.ResolvedJavaMethod;
+
+import org.junit.Test;
+
+import org.graalvm.compiler.nodes.EncodedGraph;
+import org.graalvm.compiler.nodes.GraphEncoder;
+import org.graalvm.compiler.nodes.StructuredGraph;
+import org.graalvm.compiler.nodes.StructuredGraph.AllowAssumptions;
+import org.graalvm.compiler.phases.common.CanonicalizerPhase;
+import org.graalvm.compiler.phases.tiers.PhaseContext;
+
+public class GraphEncoderTest extends GraalCompilerTest {
+
+    @Test
+    public void test01() {
+        testStringMethods(false);
+    }
+
+    @Test
+    public void test02() {
+        testStringMethods(true);
+    }
+
+    public void testStringMethods(boolean canonicalize) {
+        /* Encode and decode all methods of java.lang.String. */
+        List<StructuredGraph> originalGraphs = new ArrayList<>();
+        for (Method method : String.class.getDeclaredMethods()) {
+            ResolvedJavaMethod javaMethod = getMetaAccess().lookupJavaMethod(method);
+            if (javaMethod.hasBytecodes()) {
+                StructuredGraph originalGraph = parseEager(javaMethod, AllowAssumptions.YES);
+                if (canonicalize) {
+                    PhaseContext context = new PhaseContext(getProviders());
+                    new CanonicalizerPhase().apply(originalGraph, context);
+                }
+                originalGraphs.add(originalGraph);
+            }
+        }
+
+        GraphEncoder encoder = new GraphEncoder(getTarget().arch);
+        for (StructuredGraph originalGraph : originalGraphs) {
+            encoder.prepare(originalGraph);
+        }
+        encoder.finishPrepare();
+        Map<StructuredGraph, Integer> startOffsets = new HashMap<>();
+        for (StructuredGraph originalGraph : originalGraphs) {
+            startOffsets.put(originalGraph, encoder.encode(originalGraph));
+        }
+
+        for (StructuredGraph originalGraph : originalGraphs) {
+            EncodedGraph encodedGraph = new EncodedGraph(encoder.getEncoding(), startOffsets.get(originalGraph), encoder.getObjects(), encoder.getNodeClasses(), originalGraph.getAssumptions(),
+                            originalGraph.getMethods());
+            GraphEncoder.verifyEncoding(originalGraph, encodedGraph, getTarget().arch);
+        }
+    }
+}