Add Object::IsDirty function in the API.

src/objects.cc

Index: src/objects.cc
===================================================================
--- src/objects.cc	(revision 2910)
+++ src/objects.cc	(working copy)
@@ -476,6 +476,21 @@
 }
 
 
+bool JSObject::IsDirty() {
+  Object* cons_obj = map()->constructor();

[Mads Ager (chromium), 2009/09/17 08:46:18]

How about just calling it constructor instead of cons_obj?

[Christian Plesner Hansen, 2009/09/17 08:53:15]

The reason I used cons_obj is that we don't know if it really is the constructor
until after the check below.  At this point it's just some object stored in the
constructor field.

+  if (!cons_obj->IsJSFunction())
+    return true;
+  JSFunction* fun = JSFunction::cast(cons_obj);
+  if (!fun->shared()->function_data()->IsFunctionTemplateInfo())
+    return true;
+  // If the object is fully fast case and has the same map it was
+  // created with then no changes can have been made to it.
+  return map() != fun->initial_map()
+      || !HasFastElements()
+      || !HasFastProperties();
+}
+
+
 Object* Object::GetProperty(Object* receiver,
                             LookupResult* result,
                             String* name,