New bigint implementation in the vm.

runtime/vm/dart_api_message.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 VM_DART_API_MESSAGE_H_
 #define VM_DART_API_MESSAGE_H_
 
 #include "include/dart_native_api.h"
 #include "vm/dart_api_state.h"
 #include "vm/snapshot.h"
@@ skipping 65 matching lines @@
   // object in the API message.
   Dart_CObject* AllocateDartCObjectUnsupported();
   // Allocates a Dart_CObject object for the null object.
   Dart_CObject* AllocateDartCObjectNull();
   // Allocates a Dart_CObject object for a boolean object.
   Dart_CObject* AllocateDartCObjectBool(bool value);
   // Allocates a Dart_CObject object for for a 32-bit integer.
   Dart_CObject* AllocateDartCObjectInt32(int32_t value);
   // Allocates a Dart_CObject object for for a 64-bit integer.
   Dart_CObject* AllocateDartCObjectInt64(int64_t value);
-  // Allocates a Dart_CObject object for bigint data.
-  Dart_CObject* AllocateDartCObjectBigint(intptr_t length);
+  // Allocates an empty Dart_CObject object for a bigint to be filled up later.
+  Dart_CObject* AllocateDartCObjectBigint();
   // Allocates a Dart_CObject object for a double.
   Dart_CObject* AllocateDartCObjectDouble(double value);
   // Allocates a Dart_CObject object for string data.
   Dart_CObject* AllocateDartCObjectString(intptr_t length);
   // Allocates a C Dart_CObject object for a typed data.
   Dart_CObject* AllocateDartCObjectTypedData(
       Dart_TypedData_Type type, intptr_t length);
   // Allocates a C array of Dart_CObject objects.
   Dart_CObject* AllocateDartCObjectArray(intptr_t length);
   // Allocates a Dart_CObject_Internal object with the specified type.
@@ skipping 88 matching lines @@
   Dart_CObject** forward_list_;
   intptr_t forward_list_length_;
   intptr_t forward_id_;
 
   DISALLOW_COPY_AND_ASSIGN(ApiMessageWriter);
 };
 
 }  // namespace dart
 
 #endif  // VM_DART_API_MESSAGE_H_