--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/make/langtools/src/classes/build/tools/symbolgenerator/ProbeModular.java	Mon Nov 06 14:10:39 2017 +0100
@@ -0,0 +1,118 @@
+/*
+ * Copyright (c) 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.  Oracle designates this
+ * particular file as subject to the "Classpath" exception as provided
+ * by Oracle in the LICENSE file that accompanied this code.
+ *
+ * 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 build.tools.symbolgenerator;
+
+import com.sun.source.util.JavacTask;
+import com.sun.tools.javac.api.JavacTool;
+import com.sun.tools.javac.util.Context;
+import java.io.BufferedInputStream;
+import java.io.ByteArrayOutputStream;
+import java.io.File;
+import java.io.FileOutputStream;
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.OutputStream;
+import java.nio.charset.Charset;
+import java.util.Arrays;
+import java.util.EnumSet;
+import java.util.List;
+import java.util.Set;
+
+import javax.tools.JavaFileManager;
+import javax.tools.JavaFileManager.Location;
+import javax.tools.JavaFileObject;
+import javax.tools.JavaFileObject.Kind;
+import javax.tools.StandardLocation;
+
+/**A tool to dump the content of the default javac's bootclasspath. This tool should not use any
+ * features not available on the oldest supported target JDK, or not available in the boot JDK.
+ *
+ * For more information on use of this site, please see CreateSymbols.
+ */
+public class ProbeModular {
+
+    public static void main(String... args) throws IOException {
+        if (args.length != 1) {
+            System.err.println("Not enough arguments.");
+            System.err.println("Usage:");
+            System.err.println("    java " +
+                               ProbeModular.class.getName() +
+                               " <output-file>");
+            return ;
+        }
+
+        File outFile = new File(args[0]);
+        Charset cs = Charset.forName("UTF-8");
+        JavacTool tool = JavacTool.create();
+        Context ctx = new Context();
+        String version = System.getProperty("java.specification.version");
+        JavacTask task = tool.getTask(null, null, null,
+                                      Arrays.asList("--release", version),
+                                      null, null, ctx);
+        task.getElements().getTypeElement("java.lang.Object");
+        JavaFileManager fm = ctx.get(JavaFileManager.class);
+
+        try (OutputStream out = new FileOutputStream(outFile)) {
+            for (Location modLoc : LOCATIONS) {
+                for (Set<JavaFileManager.Location> module :
+                        fm.listLocationsForModules(modLoc)) {
+                    for (JavaFileManager.Location loc : module) {
+                        Iterable<JavaFileObject> files =
+                                fm.list(loc,
+                                        "",
+                                        EnumSet.of(Kind.CLASS),
+                                        true);
+
+                        for (JavaFileObject jfo : files) {
+                            try (InputStream is = jfo.openInputStream();
+                                 InputStream in =
+                                         new BufferedInputStream(is)) {
+                                ByteArrayOutputStream baos =
+                                        new ByteArrayOutputStream();
+                                StringBuilder textual = new StringBuilder();
+                                int read;
+
+                                while ((read = in.read()) != (-1)) {
+                                    baos.write(read);
+                                    String hex = String.format("%02x", read);
+                                    textual.append(hex);
+                                }
+
+                                textual.append("\n");
+                                out.write(textual.toString().getBytes(cs));
+                            }
+                        }
+                    }
+                }
+            }
+        }
+    }
+    //where:
+        private static final List<StandardLocation> LOCATIONS =
+                Arrays.asList(StandardLocation.SYSTEM_MODULES,
+                              StandardLocation.UPGRADE_MODULE_PATH);
+
+}