diff -r bbb498ccb4ac -r 26e3035cdffc src/compiler/BytecodeEmitter.h
--- a/src/compiler/BytecodeEmitter.h	Sat Dec 22 23:18:57 2012 -0800
+++ b/src/compiler/BytecodeEmitter.h	Mon Dec 24 02:49:20 2012 -0800
@@ -188,9 +188,10 @@
             maxStackDepth_ = oopMap_.length();
     }
     void writeObject(Object *obj) {
+        assert(obj);
+
         writeUint32(objects_.length());
-        ScopedRoot<Object> root(obj);
-        if (!objects_.append(root))
+        if (!objects_.append(obj))
             oom_ = true;
     }
 
@@ -528,11 +529,17 @@
         }
     }
     void object(Handle<Object> obj) {
+        assert(obj);
+
         ensure(OP_OBJECT_LENGTH);
         writeOp(OP_OBJECT);
         writeObject(obj);
         markOop(1);
     }
+    void duparray() {
+        singleByteOp(OP_DUPARRAY);
+        markOop(1);
+    }
     void copyarray() {
         singleByteOp(OP_COPYARRAY);
         markOop(1);