--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/jdk.internal.vm.compiler/share/classes/org.graalvm.compiler.api.test/src/org/graalvm/compiler/api/test/ModuleSupport.java	Thu Oct 31 16:54:16 2019 -0700
@@ -0,0 +1,129 @@
+/*
+ * Copyright (c) 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 org.graalvm.compiler.api.test;
+
+import java.io.IOException;
+import java.lang.module.ModuleDescriptor.Requires;
+import java.net.URI;
+import java.nio.file.FileSystem;
+import java.nio.file.FileSystems;
+import java.nio.file.Files;
+import java.nio.file.Path;
+import java.util.ArrayList;
+import java.util.Collections;
+import java.util.HashSet;
+import java.util.List;
+import java.util.Set;
+
+import org.graalvm.compiler.debug.DebugOptions;
+
+import jdk.internal.module.Modules;
+
+public class ModuleSupport {
+
+    public static void exportPackageTo(Class<?> moduleMember, String packageName, Class<?> requestor) {
+        Module moduleToExport = moduleMember.getModule();
+        Module requestorModule = requestor.getModule();
+        if (moduleToExport != requestorModule) {
+            Modules.addExports(moduleToExport, packageName, requestorModule);
+        }
+    }
+
+    public static void exportAllPackagesTo(Class<?> moduleMember, Class<?> requestor) {
+        Module moduleToExport = moduleMember.getModule();
+        Module requestorModule = requestor.getModule();
+        if (moduleToExport != requestorModule) {
+            for (String packageName : moduleToExport.getPackages()) {
+                Modules.addExports(moduleToExport, packageName, requestorModule);
+            }
+        }
+    }
+
+    public static void exportAllPackagesTo(Class<?> moduleMember, ClassLoader cl) {
+        Module moduleToExport = moduleMember.getModule();
+        Module unnamedModule = cl.getUnnamedModule();
+        for (String packageName : moduleToExport.getPackages()) {
+            Modules.addExports(moduleToExport, packageName, unnamedModule);
+        }
+    }
+
+    @SuppressWarnings("unused")
+    public static void exportAndOpenAllPackagesToUnnamed(String name) {
+        Module module = ModuleLayer.boot().findModule(name).orElseThrow();
+        Set<String> packages = module.getPackages();
+        for (String pkg : packages) {
+            Modules.addExportsToAllUnnamed(module, pkg);
+            Modules.addOpensToAllUnnamed(module, pkg);
+        }
+    }
+
+    public static List<String> getJRTGraalClassNames() throws IOException {
+        List<String> classNames = new ArrayList<>();
+        FileSystem fs = FileSystems.newFileSystem(URI.create("jrt:/"), Collections.emptyMap());
+        Module graalModule = DebugOptions.class.getModule();
+        Set<String> graalModuleSet = new HashSet<>();
+        graalModuleSet.add(graalModule.getName());
+        for (Module module : graalModule.getLayer().modules()) {
+            if (requires(module, graalModule)) {
+                graalModuleSet.add(module.getName());
+            }
+        }
+
+        Path top = fs.getPath("/modules/");
+        Files.find(top, Integer.MAX_VALUE,
+                        (path, attrs) -> attrs.isRegularFile()).forEach(p -> {
+                            int nameCount = p.getNameCount();
+                            if (nameCount > 2) {
+                                String base = p.getName(nameCount - 1).toString();
+                                if (base.endsWith(".class") && !base.equals("module-info.class")) {
+                                    String module = p.getName(1).toString();
+                                    if (graalModuleSet.contains(module)) {
+                                        // Strip module prefix and convert to dotted
+                                        // form
+                                        String className = p.subpath(2, nameCount).toString().replace('/', '.');
+                                        // Strip ".class" suffix
+                                        className = className.replace('/', '.').substring(0, className.length() - ".class".length());
+                                        classNames.add(className);
+                                    }
+                                }
+                            }
+                        });
+        return classNames;
+    }
+
+    private static boolean requires(Module module, Module graalModule) {
+        ModuleLayer graalLayer = graalModule.getLayer();
+        for (Requires r : module.getDescriptor().requires()) {
+            if (r.name().equals(graalModule.getName())) {
+                return true;
+            }
+            Module dep = graalLayer.findModule(r.name()).get();
+            if (requires(dep, graalModule)) {
+                return true;
+            }
+        }
+        return false;
+    }
+}