diff -r 000000000000 -r dcb98731b000 vm/src/main/java/org/apidesign/vm4brwsr/GenJS.java
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/vm/src/main/java/org/apidesign/vm4brwsr/GenJS.java	Tue Sep 25 12:11:03 2012 +0200
@@ -0,0 +1,76 @@
+package org.apidesign.vm4brwsr;
+
+import java.io.BufferedWriter;
+import java.io.FileWriter;
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.Writer;
+import java.util.Arrays;
+import java.util.HashSet;
+import java.util.LinkedList;
+import java.util.List;
+import java.util.Set;
+
+/** Generator of JavaScript from bytecode of classes on classpath of the VM.
+ *
+ * @author Jaroslav Tulach <jtulach@netbeans.org>
+ */
+final class GenJS {
+    private GenJS() {}
+    
+    public static void main(String... args) throws IOException {
+        if (args.length < 2) {
+            System.err.println("Usage: java -cp ... -jar ... <file_to_generate_js_code_to> java/lang/Class org/your/App ...");
+            return;
+        }
+        
+        Writer w = new BufferedWriter(new FileWriter(args[0]));
+        List<String> classes = Arrays.asList(args).subList(1, args.length);
+        compile(w, classes);
+        w.close();
+    }
+    
+    static void compile(Appendable out, String... names) throws IOException {
+        compile(out, Arrays.asList(names));
+    }
+    static void compile(Appendable out, List<String> names) throws IOException {
+        Set<String> processed = new HashSet<String>();
+        LinkedList<String> toProcess = new LinkedList<String>(names);
+        for (;;) {
+            toProcess.removeAll(processed);
+            if (toProcess.isEmpty()) {
+                break;
+            }
+            String name = toProcess.getFirst();
+            processed.add(name);
+            if (name.startsWith("java/") && !name.equals("java/lang/Object")) {
+                continue;
+            }
+            InputStream is = GenJS.class.getClassLoader().getResourceAsStream(name + ".class");
+            if (is == null) {
+                throw new IOException("Can't find class " + name); 
+            }
+            try {
+                ByteCodeToJavaScript.compile(is, out, toProcess);
+            } catch (RuntimeException ex) {
+                if (out instanceof CharSequence) {
+                    CharSequence seq = (CharSequence)out;
+                    int lastBlock = seq.length();
+                    while (lastBlock-- >= 0) {
+                        if (seq.charAt(lastBlock) == '{') {
+                            break;
+                        }
+                    }
+                    throw new IOException("Error while compiling " + name + "\n" 
+                        + seq.subSequence(lastBlock + 1, seq.length()), ex
+                    );
+                } else {
+                    throw new IOException("Error while compiling " + name + "\n" 
+                        + out, ex
+                    );
+                }
+            }
+        }
+    }
+    
+}