--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/test/jdk/lib/testlibrary/ModuleTargetHelper.java	Tue Sep 12 19:03:39 2017 +0200
@@ -0,0 +1,96 @@
+/*
+ * Copyright (c) 2017, 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.
+ */
+
+import java.io.InputStream;
+import java.io.IOException;
+import java.lang.module.ModuleReader;
+import java.lang.module.ModuleReference;
+import java.net.URI;
+import java.nio.file.Files;
+import java.nio.file.Path;
+import java.nio.file.Paths;
+import jdk.internal.module.ClassFileConstants;
+import jdk.internal.module.ClassFileAttributes;
+import jdk.internal.module.ClassFileAttributes.ModuleTargetAttribute;
+import jdk.internal.org.objectweb.asm.Attribute;
+import jdk.internal.org.objectweb.asm.ClassReader;
+import jdk.internal.org.objectweb.asm.ClassVisitor;
+import jdk.internal.org.objectweb.asm.Opcodes;
+
+public class ModuleTargetHelper {
+    private ModuleTargetHelper() {}
+
+    public static final class ModuleTarget {
+        private String targetPlatform;
+
+        public ModuleTarget(String targetPlatform) {
+            this.targetPlatform = targetPlatform;
+        }
+
+        public String targetPlatform() {
+            return targetPlatform;
+        }
+    }
+
+    public static ModuleTarget getJavaBaseTarget() throws IOException {
+        Path p = Paths.get(URI.create("jrt:/modules/java.base/module-info.class"));
+        try (InputStream in = Files.newInputStream(p)) {
+            return read(in);
+        }
+    }
+
+    public static ModuleTarget read(InputStream in) throws IOException {
+        ModuleTargetAttribute[] modTargets = new ModuleTargetAttribute[1];
+        ClassVisitor cv = new ClassVisitor(Opcodes.ASM5) {
+            @Override
+            public void visitAttribute(Attribute attr) {
+                if (attr instanceof ModuleTargetAttribute) {
+                    modTargets[0] = (ModuleTargetAttribute)attr;
+                }
+            }
+        };
+
+        // prototype of attributes that should be parsed
+        Attribute[] attrs = new Attribute[] {
+            new ModuleTargetAttribute()
+        };
+
+        // parse module-info.class
+        ClassReader cr = new ClassReader(in);
+        cr.accept(cv, attrs, 0);
+        if (modTargets[0] != null) {
+            return new ModuleTarget(modTargets[0].targetPlatform());
+        }
+
+        return null;
+    }
+
+    public static ModuleTarget read(ModuleReference modRef) throws IOException {
+        ModuleReader reader = modRef.open();
+        try (InputStream in = reader.open("module-info.class").get()) {
+            return read(in);
+        } finally {
+            reader.close();
+        }
+    }
+}