RELOAD: Maintain identity of static tear-offs.

runtime/vm/object_reload.cc

 // Copyright (c) 2016, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #include "vm/object.h"
 
 #include "vm/hash_table.h"
 #include "vm/isolate_reload.h"
 #include "vm/log.h"
 #include "vm/resolver.h"
@@ skipping 345 matching lines @@
     ASSERT(!owner.IsNull());
     if (!owner.IsPatchClass()) {
       ASSERT(owner.raw() == this->raw());
       field.set_owner(patch);
     }
     field.ForceDynamicGuardedCidAndLength();
   }
 }
 
 
+void Class::MigrateImplicitStaticClosures(IsolateReloadContext* irc,
+                                          const Class& new_cls) const {
+  const Array& funcs = Array::Handle(functions());
+  Function& old_func = Function::Handle();
+  String& selector = String::Handle();
+  Function& new_func = Function::Handle();
+  Instance& old_closure = Instance::Handle();
+  Instance& new_closure = Instance::Handle();
+  for (intptr_t i = 0; i < funcs.Length(); i++) {
+    old_func ^= funcs.At(i);
+    if (old_func.is_static() &&
+      old_func.HasImplicitClosureFunction()) {
+      selector = old_func.name();
+      new_func = new_cls.LookupFunction(selector);
+      if (!new_func.IsNull() && new_func.is_static()) {
+        old_func = old_func.ImplicitClosureFunction();
+        old_closure = old_func.ImplicitStaticClosure();
+        new_func = new_func.ImplicitClosureFunction();
+        new_closure = new_func.ImplicitStaticClosure();
+        irc->AddBecomeMapping(old_closure, new_closure);
+      }
+    }
+  }
+}
+
+
 class EnumClassConflict : public ClassReasonForCancelling {
  public:
   EnumClassConflict(const Class& from, const Class& to)
       : ClassReasonForCancelling(from, to) { }
 
   RawString* ToString() {
     return String::NewFormatted(
         from_.is_enum_class()
         ? "Enum class cannot be redefined to be a non-enum class: %s"
         : "Class cannot be redefined to be a enum class: %s",
@@ skipping 319 matching lines @@
     }
     ClearAndSetStaticTarget(new_target);
   } else {
     ClearWithSentinel();
   }
 }
 
 #endif  // !PRODUCT
 
 }   // namespace dart.