diff -r 1ee59fe94653 -r d382dacfd73f rt/vm/src/main/java/org/apidesign/vm4brwsr/VMLazy.java
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/rt/vm/src/main/java/org/apidesign/vm4brwsr/VMLazy.java	Tue Feb 26 16:54:16 2013 +0100
@@ -0,0 +1,155 @@
+/**
+ * Back 2 Browser Bytecode Translator
+ * Copyright (C) 2012 Jaroslav Tulach <jaroslav.tulach@apidesign.org>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, version 2 of the License.
+ *
+ * This program 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 for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. Look for COPYING file in the top folder.
+ * If not, see http://opensource.org/licenses/GPL-2.0.
+ */
+package org.apidesign.vm4brwsr;
+
+import java.io.ByteArrayInputStream;
+import java.io.IOException;
+import java.io.InputStream;
+import java.lang.reflect.Array;
+import org.apidesign.bck2brwsr.core.JavaScriptBody;
+
+/**
+ *
+ * @author Jaroslav Tulach <jtulach@netbeans.org>
+ */
+final class VMLazy {
+    private final Object loader;
+    private final Object[] args;
+    
+    private VMLazy(Object loader, Object[] args) {
+        this.loader = loader;
+        this.args = args;
+    }
+    
+    static void init() {
+    }
+    
+    static Object load(Object loader, String name, Object[] arguments) 
+    throws IOException, ClassNotFoundException {
+        return new VMLazy(loader, arguments).load(name, false);
+    }
+    
+    static byte[] loadBytes(Object loader, String name, Object[] arguments) throws Exception {
+        return Zips.loadFromCp(arguments, name);
+    }
+    
+    private Object load(String name, boolean instance)
+    throws IOException, ClassNotFoundException {
+        String res = name.replace('.', '/') + ".class";
+        byte[] arr = Zips.loadFromCp(args, res);
+        if (arr == null) {
+            throw new ClassNotFoundException(name);
+        }
+//        beingDefined(loader, name);
+        StringBuilder out = new StringBuilder();
+        out.append("var loader = arguments[0];\n");
+        out.append("var vm = loader.vm;\n");
+        int prelude = out.length();
+        String initCode = new Gen(this, out).compile(new ByteArrayInputStream(arr));
+        String code = out.toString().toString();
+//        dump("Loading " + name);
+        dump(code);
+        String under = name.replace('.', '_');
+        Object fn = applyCode(loader, under, code, instance);
+        
+        if (!initCode.isEmpty()) {
+            out.setLength(prelude);
+            out.append(initCode);
+            code = out.toString().toString();
+            dump(code);
+            applyCode(loader, null, code, false);
+        }            
+        
+        return fn;
+    }
+
+//    @JavaScriptBody(args = "s", body = "java.lang.System.out.println(s.toString());")
+    static void dump(String s) {
+    }
+
+/* possibly not needed:
+    @JavaScriptBody(args = {"loader", "n" }, body =
+        "var cls = n.replace__Ljava_lang_String_2CC(n, '.','_').toString();" +
+        "loader.vm[cls] = true;\n"
+    )
+    private static native void beingDefined(Object loader, String name);
+*/
+    
+
+    @JavaScriptBody(args = {"loader", "name", "script", "instance" }, body =
+        "try {\n" +
+        "  new Function(script)(loader, name);\n" +
+        "} catch (ex) {\n" +
+        "  throw 'Cannot compile ' + name + ' ' + ex + ' line: ' + ex.lineNumber + ' script:\\n' + script;\n" +
+        "}\n" +
+        "return name != null ? vm[name](instance) : null;\n"
+    )
+    private static native Object applyCode(Object loader, String name, String script, boolean instance);
+    
+    
+    private static final class Gen extends ByteCodeToJavaScript {
+        private final VMLazy lazy;
+
+        public Gen(VMLazy vm, Appendable out) {
+            super(out);
+            this.lazy = vm;
+        }
+        
+        @JavaScriptBody(args = {"n"},
+        body =
+        "var cls = n.replace__Ljava_lang_String_2CC('/','_').toString();"
+        + "\nvar dot = n.replace__Ljava_lang_String_2CC('/','.').toString();"
+        + "\nvar lazy = this._lazy();"
+        + "\nvar loader = lazy._loader();"
+        + "\nvar vm = loader.vm;"
+        + "\nif (vm[cls]) return false;"
+        + "\nvm[cls] = function() {"
+        + "\n  var instance = arguments.length == 0 || arguments[0] === true;"
+        + "\n  return lazy.load__Ljava_lang_Object_2Ljava_lang_String_2Z(dot, instance);"
+        + "\n};"
+        + "\nreturn true;")
+        @Override
+        protected boolean requireReference(String internalClassName) {
+            throw new UnsupportedOperationException();
+        }
+
+        @Override
+        protected void requireScript(String resourcePath) throws IOException {
+            InputStream is = getClass().getResourceAsStream(resourcePath);
+            StringBuilder sb = new StringBuilder();
+            for (;;) {
+                int ch = is.read();
+                if (ch == -1) {
+                    break;
+                }
+                sb.append((char)ch);
+            }
+            applyCode(lazy.loader, null, sb.toString(), false);
+        }
+
+        @Override
+        String assignClass(String className) {
+            return "vm[arguments[1]]=";
+        }
+
+        @Override
+        String accessClass(String classOperation) {
+            return "vm." + classOperation;
+        }
+    }
+}