diff -r 4d0fff61d65e -r 0456a16c2a63 src/Array.cpp
--- a/src/Array.cpp	Sun Aug 05 21:24:41 2012 -0700
+++ b/src/Array.cpp	Mon Aug 06 02:03:36 2012 -0700
@@ -37,6 +37,27 @@
     return map;
 }
 
+ArrayMap *
+ArrayMap::Attach(Zone *zone, Handle<Type> type)
+{
+    if (type->newMap())
+        return ArrayMap::cast(type->newMap());
+
+    Local<ArrayMap> map(zone, ArrayMap::New(zone, type));
+    if (!map)
+        return NULL;
+
+    // Ensure the inner type has an ArrayMap if needed.
+    if (type->contained()->isArray()) {
+        Local<Type> contained(zone, type->contained());
+        if (!ArrayMap::Attach(zone, contained))
+            return NULL;
+    }
+
+    type->setNewMap(map);
+    return map;
+}
+
 static inline size_t
 SizeFor(Type *type, unsigned elements)
 {
@@ -89,6 +110,18 @@
 }
 
 Array *
+Array::NewString(Zone *zone, Handle<ArrayMap> map, Address buffer, size_t length, Heap::Tenure tenure)
+{
+    Local<Array> array(zone, Array::New(zone, map, length, tenure));
+    if (!array)
+        return NULL;
+
+    assert(array->length() >= length);
+    memcpy(array->chars(), buffer, length);
+    return array;
+}
+
+Array *
 Array::NewExternal(Zone *zone, Handle<ArrayMap> map, uint32 nelements, void *buffer,
                    Heap::Tenure tenure)
 {