diff -r f6b1a68e7ebb -r c920f9328716 jitcraft/Code.h
--- a/jitcraft/Code.h	Tue Jul 03 01:25:23 2012 -0700
+++ b/jitcraft/Code.h	Tue Jul 03 08:30:09 2012 -0700
@@ -69,6 +69,21 @@
         return objects_->at(index);
     }
 
+    // GC Descriptor.
+    static inline size_t offsetOfModule() {
+        return offsetof(Code, module_);
+    }
+    static inline size_t offsetOfBytecode() {
+        return offsetof(Code, bytecode_);
+    }
+    static inline size_t offsetOfLocals() {
+        return offsetof(Code, locals_);
+    }
+    static inline size_t offsetOfObjects() {
+        return offsetof(Code, objects_);
+    }
+    // End GC Descriptor.
+
     static Code *cast(Object *obj) {
         assert(!obj || obj->is(MapKind_Code));
         return reinterpret_cast<Code *>(obj);