--- a/src/jdk/nashorn/internal/runtime/Context.java	Wed May 06 20:04:42 2015 +0530
+++ b/src/jdk/nashorn/internal/runtime/Context.java	Tue May 12 12:40:33 2015 +0530
@@ -1239,6 +1239,10 @@
         }
 
         if (storedScript == null) {
+            if (env._dest_dir != null) {
+                source.dump(env._dest_dir);
+            }
+
             functionNode = new Parser(env, source, errMan, strict, getLogger(Parser.class)).parse();
 
             if (errMan.hasErrors()) {

--- a/src/jdk/nashorn/internal/runtime/ScriptEnvironment.java	Wed May 06 20:04:42 2015 +0530
+++ b/src/jdk/nashorn/internal/runtime/ScriptEnvironment.java	Tue May 12 12:40:33 2015 +0530
@@ -73,7 +73,7 @@
     /** Generate line number table in class files */
     public final boolean _debug_lines;
 
-    /** Package to which generated class files are added */
+    /** Directory in which source files and generated class files are dumped */
     public final String  _dest_dir;
 
     /** Display stack trace upon error, default is false */

--- a/src/jdk/nashorn/internal/runtime/Source.java	Wed May 06 20:04:42 2015 +0530
+++ b/src/jdk/nashorn/internal/runtime/Source.java	Tue May 12 12:40:33 2015 +0530
@@ -28,9 +28,11 @@
 import java.io.ByteArrayOutputStream;
 import java.io.File;
 import java.io.FileNotFoundException;
+import java.io.FileOutputStream;
 import java.io.IOError;
 import java.io.IOException;
 import java.io.InputStream;
+import java.io.PrintWriter;
 import java.io.Reader;
 import java.lang.ref.WeakReference;
 import java.net.MalformedURLException;
@@ -44,6 +46,7 @@
 import java.nio.file.Paths;
 import java.security.MessageDigest;
 import java.security.NoSuchAlgorithmException;
+import java.time.LocalDateTime;
 import java.util.Arrays;
 import java.util.Base64;
 import java.util.Objects;
@@ -965,4 +968,39 @@
     public DebugLogger getLogger() {
         return initLogger(Context.getContextTrusted());
     }
+
+    private File dumpFile(final String dir) {
+        final URL u = getURL();
+        final StringBuilder buf = new StringBuilder();
+        // make it unique by prefixing current date & time
+        buf.append(LocalDateTime.now().toString());
+        buf.append('_');
+        if (u != null) {
+            // make it a safe file name
+            buf.append(u.toString()
+                    .replace('/', '_')
+                    .replace('\\', '_'));
+        } else {
+            buf.append(getName());
+        }
+
+        return new File(dir, buf.toString());
+    }
+
+    void dump(final String dir) {
+        final File file = dumpFile(dir);
+        try (final FileOutputStream fos = new FileOutputStream(file)) {
+            final PrintWriter pw = new PrintWriter(fos);
+            pw.print(data.toString());
+            pw.flush();
+        } catch (final IOException ioExp) {
+            debug("Skipping source dump for " +
+                    name +
+                    ": " +
+                    ECMAErrors.getMessage(
+                        "io.error.cant.write",
+                        dir.toString() +
+                        " : " + ioExp.toString()));
+        }
+    }
 }

--- a/src/jdk/nashorn/internal/runtime/resources/Options.properties	Wed May 06 20:04:42 2015 +0530
+++ b/src/jdk/nashorn/internal/runtime/resources/Options.properties	Tue May 12 12:40:33 2015 +0530
@@ -114,7 +114,7 @@
     short_name="-d",                                             \
     is_undocumented=true,                                        \
     params="<path>",                                             \
-    desc="specify a destination directory to dump class files.", \
+    desc="specify a destination directory to dump source and class files.", \
     type=String                                                  \
 }