VM: Share closure-call dispatchers.

runtime/vm/code_generator.cc

 // Copyright (c) 2013, 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/code_generator.h"
 
 #include "vm/assembler.h"
 #include "vm/ast.h"
 #include "vm/code_patcher.h"
 #include "vm/compiler.h"
@@ skipping 721 matching lines @@
   const int kNumArguments = 1;
   ArgumentsDescriptor args_desc(
       Array::Handle(ArgumentsDescriptor::New(kNumArguments)));
   const Function& getter = Function::Handle(
       Resolver::ResolveDynamicForReceiverClass(receiver_class,
                                                getter_name,
                                                args_desc));
   if (getter.IsNull() || getter.IsMethodExtractor()) {
     return false;
   }
-
+  const Class& cache_class = Class::Handle(receiver_class.IsSignatureClass()
+      ? receiver_class.SuperClass()
+      : receiver_class.raw());
+  ASSERT(
+      !receiver_class.IsSignatureClass() ||
+      (receiver_class.SuperClass() == Type::Handle(
+       Isolate::Current()->object_store()->function_impl_type()).type_class()));
   const Function& target_function =
-      Function::Handle(receiver_class.GetInvocationDispatcher(
+      Function::Handle(cache_class.GetInvocationDispatcher(
           target_name,
           arguments_descriptor,
           RawFunction::kInvokeFieldDispatcher));
   ASSERT(!target_function.IsNull());
   if (FLAG_trace_ic) {
     OS::PrintErr("InvokeField IC miss: adding <%s> id:%" Pd " -> <%s>\n",
         Class::Handle(receiver.clazz()).ToCString(),
         receiver.GetClassId(),
         target_function.ToCString());
   }
@@ skipping 918 matching lines @@
   const intptr_t elm_size = old_data.ElementSizeInBytes();
   const TypedData& new_data =
       TypedData::Handle(TypedData::New(cid, new_size, Heap::kOld));
   TypedData::Copy(new_data, 0, old_data, 0, old_size * elm_size);
   typed_data_cell.SetAt(0, new_data);
   arguments.SetReturn(new_data);
 }
 
 
 }  // namespace dart