Add Dart_Allocate to the C++ API

runtime/vm/dart_api_impl.cc

Index: runtime/vm/dart_api_impl.cc
diff --git a/runtime/vm/dart_api_impl.cc b/runtime/vm/dart_api_impl.cc
index 176407caae7a6dd0e8a6775f9733a5fd1846a192..4714bbf349d287ae19cd3700ad6a986d74f3461b 100644
--- a/runtime/vm/dart_api_impl.cc
+++ b/runtime/vm/dart_api_impl.cc
@@ -2818,6 +2818,23 @@ DART_EXPORT Dart_Handle Dart_New(Dart_Handle clazz,
 }
 
 
+DART_EXPORT Dart_Handle Dart_Allocate(Dart_Handle clazz) {
+  Isolate* isolate = Isolate::Current();
+  DARTSCOPE(isolate);
+  CHECK_CALLBACK_STATE(isolate);
+  Object& result = Object::Handle(isolate);

[siva, 2013/06/18 00:52:14]

result doesn't seem to be used at all.

+
+  // Get the class to instantiate.
+  Class& cls =
+      Class::Handle(isolate, Api::UnwrapClassHandle(isolate, clazz).raw());

[siva, 2013/06/18 00:52:14]

const Class& cls = Api::UnwrapClassHandle(isolate, clazz);

+  if (cls.IsNull()) {
+    RETURN_TYPE_ERROR(isolate, clazz, Class);
+  }
+
+  return Api::NewHandle(isolate, Instance::New(cls));
+}

[siva, 2013/06/18 00:52:14]

We would also need a test for this in dart_api_impl_test.cc

[vsm, 2013/06/19 14:55:12]

I rewrote this code to also accept Types, and I added a test.

On 2013/06/18 00:52:14, siva wrote:

+
+
 DART_EXPORT Dart_Handle Dart_Invoke(Dart_Handle target,
                                     Dart_Handle name,
                                     int number_of_arguments,