Canonicalize types.

runtime/vm/class_finalizer.h

 // Copyright (c) 2011, 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 VM_CLASS_FINALIZER_H_
 #define VM_CLASS_FINALIZER_H_
 
 #include "vm/allocation.h"
 #include "vm/growable_array.h"
 
 namespace dart {
 
 class Class;
 class Function;
-class RawString;
 class RawType;
 class Script;
+class String;
 class Type;
 class TypeArguments;
 
 // Traverses all pending, unfinalized classes, validates and marks them as
 // finalized.
 class ClassFinalizer : public AllStatic {
  public:
   // Add 'interface' to 'interface_list' if it is not already in the list and
   // return true. Also return true if 'interface' is not added, because it is
   // not unique, i.e. it is already in the list.
   // Return false if 'interface' conflicts with an interface already in the list
   // with the same class, but different type arguments.
   // In the case of a conflict, set 'conflicting' to the existing interface.
   static bool AddInterfaceIfUnique(GrowableArray<Type*>* interface_list,
                                    Type* interface,
                                    Type* conflicting);
 
-  // Finalize type. Used for local variable types.
-  static void FinalizeType(const Type& type);
-  static RawString* FinalizeTypeWhileParsing(const Type& type);
+  // Finalize and canonicalize type while parsing.
+  // Set the error message on failure (to String::null() if no error).
+  static RawType* FinalizeAndCanonicalizeType(const Type& type, String* errmsg);
 
   // Pending classes are classes that need to be finalized.
   static void AddPendingClasses(const GrowableArray<const Class*>& classes);
 
   // Return false if we still have classes pending to be finalized.
   static bool AllClassesFinalized();
 
   // Return whether class finalization failed.
   // The function returns true if the finalization was successful.
   // If finalization fails, an error message is set in the sticky error field
   // in the object store.
   static bool FinalizePendingClasses();
 
   // Verify that the pending classes have been properly prefinalized. This is
   // needed during bootstrapping where the classes have been preloaded.
   static void VerifyBootstrapClasses();
 
  private:
   static void FinalizeClass(const Class& cls);
   static bool IsSuperCycleFree(const Class& cls);
   static void CheckForLegalConstClass(const Class& cls);
   static void ResolveSuperClass(const Class& cls);
   static void ResolveDefaultClass(const Class& cls);
   static void ResolveInterfaces(const Class& cls,
                                 GrowableArray<const Class*>* visited);
   static void FinalizeTypeArguments(const Class& cls,
                                     const TypeArguments& arguments);
   static RawType* ResolveType(const Class& cls, const Type& type);
+  static void FinalizeType(const Type& type);
   static void ResolveAndFinalizeSignature(const Class& cls,
                                           const Function& function);
   static void ResolveAndFinalizeMemberTypes(const Class& cls);
   static void PrintClassInformation(const Class& cls);
   static void VerifyClassImplements(const Class& cls);
   static void CollectInterfaces(const Class& cls,
                                 GrowableArray<const Class*>* interfaces);
   static void ReportError(const Script& script,
                           intptr_t token_index,
                           const char* format, ...);
   static void ReportError(const char* format, ...);
 };
 
 }  // namespace dart
 
 #endif  // VM_CLASS_FINALIZER_H_