Implement generic function type syntax in the VM (fixes #27966).

runtime/vm/class_finalizer.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_CLASS_FINALIZER_H_
 #define RUNTIME_VM_CLASS_FINALIZER_H_
 
 #include "vm/allocation.h"
 #include "vm/growable_array.h"
 #include "vm/object.h"
@@ skipping 17 matching lines @@
                              // canonicalization are required.
   };
 
   // Finalize given type while parsing class cls.
   // Also canonicalize type if applicable.
   static RawAbstractType* FinalizeType(const Class& cls,
                                        const AbstractType& type,
                                        FinalizationKind finalization,
                                        PendingTypes* pending_types = NULL);
 
+  // Finalize the types in the functions's signature while parsing class cls.
+  static void FinalizeSignature(const Class& cls, const Function& function);
+
   // Allocate, finalize, and return a new malformed type as if it was declared
   // in class cls at the given token position.
   // If not null, prepend prev_error to the error message built from the format
   // string and its arguments.
   static RawType* NewFinalizedMalformedType(const Error& prev_error,
                                             const Script& script,
                                             TokenPosition type_pos,
                                             const char* format,
                                             ...) PRINTF_ATTRIBUTE(4, 5);
 
@@ skipping 97 matching lines @@
                                  const AbstractType& type,
                                  PendingTypes* pending_types);
   static void CheckTypeBounds(const Class& cls, const AbstractType& type);
   static void CheckTypeArgumentBounds(const Class& cls,
                                       const TypeArguments& arguments,
                                       Error* bound_error);
   static void ResolveUpperBounds(const Class& cls);
   static void FinalizeUpperBounds(const Class& cls,
                                   FinalizationKind finalization);
   static void ResolveSignature(const Class& cls, const Function& function);
-  static void FinalizeSignature(const Class& cls, const Function& function);
   static void ResolveAndFinalizeMemberTypes(const Class& cls);
   static void PrintClassInformation(const Class& cls);
   static void CollectInterfaces(const Class& cls,
                                 GrowableArray<const Class*>* collected);
 
   static void MarkTypeMalformed(const Error& prev_error,
                                 const Script& script,
                                 const Type& type,
                                 const char* format,
                                 va_list args);
   static void ReportError(const Error& error);
   static void ReportError(const Class& cls,
                           TokenPosition token_pos,
                           const char* format,
                           ...) PRINTF_ATTRIBUTE(3, 4);
   static void ReportErrors(const Error& prev_error,
                            const Class& cls,
                            TokenPosition token_pos,
                            const char* format,
                            ...) PRINTF_ATTRIBUTE(4, 5);
 
   // Verify implicit offsets recorded in the VM for direct access to fields of
   // Dart instances (e.g: _TypedListView, _ByteDataView).
   static void VerifyImplicitFieldOffsets();
 };
 
 }  // namespace dart
 
 #endif  // RUNTIME_VM_CLASS_FINALIZER_H_