Set and keep parent function of signature functions.

runtime/vm/object.h

 // Copyright (c) 2012, 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.
 
 #ifndef RUNTIME_VM_OBJECT_H_
 #define RUNTIME_VM_OBJECT_H_
 
 #include "include/dart_api.h"
 #include "platform/assert.h"
 #include "platform/utils.h"
@@ skipping 2838 matching lines @@
                           TokenPosition token_pos,
                           Heap::Space space = Heap::kOld);
 
   // Allocates a new Function object representing a closure function.
   static RawFunction* NewClosureFunction(const String& name,
                                          const Function& parent,
                                          TokenPosition token_pos);
 
   // Allocates a new Function object representing a signature function.
   // The owner is the scope class of the function type.
+  // The parent is the enclosing function or null if none.
   static RawFunction* NewSignatureFunction(const Object& owner,
+                                           const Function& parent,
                                            TokenPosition token_pos,
                                            Heap::Space space = Heap::kOld);
 
   static RawFunction* NewEvalFunction(const Class& owner,
                                       const Script& script,
                                       bool is_static);
 
   RawFunction* CreateMethodExtractor(const String& getter_name) const;
   RawFunction* GetMethodExtractor(const String& getter_name) const;
 
@@ skipping 6185 matching lines @@
 
 inline void TypeArguments::SetHash(intptr_t value) const {
   // This is only safe because we create a new Smi, which does not cause
   // heap allocation.
   StoreSmi(&raw_ptr()->hash_, Smi::New(value));
 }
 
 }  // namespace dart
 
 #endif  // RUNTIME_VM_OBJECT_H_