Generate dynamic type errors according to spec.

runtime/vm/exceptions.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_EXCEPTIONS_H_
 #define VM_EXCEPTIONS_H_
 
 #include "vm/allocation.h"
 #include "vm/growable_array.h"
 
 namespace dart {
 
 // Forward declarations.
+class Class;
+class DartFrameIterator;
 class Error;
 class Instance;
 class Object;
+class RawInstance;
+class RawScript;
 class RawObject;
+class Script;
+class String;
 
 class Exceptions : AllStatic {
  public:
   static void Throw(const Instance& exception);
   static void ReThrow(const Instance& exception, const Instance& stacktrace);
   static void PropagateError(const Object& obj);
 
+  // Helpers to create and throw errors.
+  static RawScript* GetCallerScript(DartFrameIterator* iterator);
+  static RawInstance* NewInstance(const char* class_name);
+  static void SetField(const Instance& instance,
+                       const Class& cls,
+                       const char* field_name,
+                       const Object& value);
+  static void SetLocationFields(const Instance& instance,
+                                const Class& cls,
+                                const Script& script,
+                                intptr_t location);
+  static void CreateAndThrowTypeError(intptr_t location,
+                                      const String& src_type_name,
+                                      const String& dst_type_name,
+                                      const String& dst_name,
+                                      const String& malformed_error);
+
   enum ExceptionType {
     kIndexOutOfRange,
     kIllegalArgument,
     kNoSuchMethod,
     kClosureArgumentMismatch,
     kObjectNotClosure,
     kBadNumberFormat,
     kStackOverflow,
     kOutOfMemory,
     kWrongArgumentCount,
     kInternalError,
     kNullPointer,
     kIllegalJSRegExp,
   };
 
   static void ThrowByType(ExceptionType type,
                           const GrowableArray<const Object*>& arguments);
   // Returns a RawInstance if the exception is successfully created,
   // otherwise returns a RawError.
   static RawObject* Create(ExceptionType type,
                            const GrowableArray<const Object*>& arguments);
 
  private:
   DISALLOW_COPY_AND_ASSIGN(Exceptions);
 };
 
 }  // namespace dart
 
 #endif  // VM_EXCEPTIONS_H_