Add Dart_IsFuture. To be used in Dartium implementation of Promises.

runtime/vm/dart_api_impl.cc

 // Copyright (c) 2013, 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.
 
 #include "include/dart_api.h"
 #include "include/dart_mirrors_api.h"
 #include "include/dart_native_api.h"
 
 #include "platform/assert.h"
 #include "vm/class_finalizer.h"
@@ skipping 53 matching lines @@
 
 static RawInstance* GetListInstance(Isolate* isolate, const Object& obj) {
   if (obj.IsInstance()) {
     const Library& core_lib = Library::Handle(Library::CoreLibrary());
     const Class& list_class =
         Class::Handle(core_lib.LookupClass(Symbols::List()));
     ASSERT(!list_class.IsNull());
     const Instance& instance = Instance::Cast(obj);
     const Class& obj_class = Class::Handle(isolate, obj.clazz());
     Error& malformed_type_error = Error::Handle(isolate);
-    if (obj_class.IsSubtypeOf(TypeArguments::Handle(isolate),
+    if (obj_class.IsSubtypeOf(Object::null_type_arguments(),
                               list_class,
-                              TypeArguments::Handle(isolate),
+                              Object::null_type_arguments(),
                               &malformed_type_error)) {
       ASSERT(malformed_type_error.IsNull());  // Type is a raw List.
       return instance.raw();
     }
   }
   return Instance::null();
 }
 
 static RawInstance* GetMapInstance(Isolate* isolate, const Object& obj) {
   if (obj.IsInstance()) {
     const Library& core_lib = Library::Handle(Library::CoreLibrary());
     const Class& map_class =
         Class::Handle(core_lib.LookupClass(Symbols::Map()));
     ASSERT(!map_class.IsNull());
     const Instance& instance = Instance::Cast(obj);
     const Class& obj_class = Class::Handle(isolate, obj.clazz());
     Error& malformed_type_error = Error::Handle(isolate);
-    if (obj_class.IsSubtypeOf(TypeArguments::Handle(isolate),
+    if (obj_class.IsSubtypeOf(Object::null_type_arguments(),
                               map_class,
-                              TypeArguments::Handle(isolate),
+                              Object::null_type_arguments(),
                               &malformed_type_error)) {
       ASSERT(malformed_type_error.IsNull());  // Type is a raw Map.
       return instance.raw();
     }
   }
   return Instance::null();
 }
 
 
 static bool GetNativeStringArgument(NativeArguments* arguments,
@@ skipping 1756 matching lines @@
          RawObject::IsTypedDataViewClassId(cid);
 }
 
 
 DART_EXPORT bool Dart_IsByteBuffer(Dart_Handle handle) {
   TRACE_API_CALL(CURRENT_FUNC);
   return Api::ClassId(handle) == kByteBufferCid;
 }
 
 
+DART_EXPORT bool Dart_IsFuture(Dart_Handle handle) {
+  TRACE_API_CALL(CURRENT_FUNC);
+  Isolate* isolate = Isolate::Current();
+  DARTSCOPE(isolate);
+  const Object& obj = Object::Handle(isolate, Api::UnwrapHandle(handle));
+  if (obj.IsInstance()) {
+    const Library& async_lib =
+        Library::Handle(isolate, Library::AsyncLibrary());
+    const Class& future_class =
+        Class::Handle(isolate, async_lib.LookupClass(Symbols::Future()));
+    ASSERT(!future_class.IsNull());
+    const Class& obj_class = Class::Handle(isolate, obj.clazz());
+    Error& malformed_type_error = Error::Handle(isolate);
+    bool is_future = obj_class.IsSubtypeOf(Object::null_type_arguments(),
+                                           future_class,
+                                           Object::null_type_arguments(),
+                                           &malformed_type_error);
+    ASSERT(malformed_type_error.IsNull());  // Type is a raw Future.
+    return is_future;
+  }
+  return false;
+}
+
+
 // --- Instances ----
 
 DART_EXPORT Dart_Handle Dart_InstanceGetType(Dart_Handle instance) {
   Isolate* isolate = Isolate::Current();
   DARTSCOPE(isolate);
   const Object& obj = Object::Handle(isolate, Api::UnwrapHandle(instance));
   if (obj.IsNull()) {
     return Api::NewHandle(isolate, isolate->object_store()->null_type());
   }
   if (!obj.IsInstance()) {
@@ skipping 3501 matching lines @@
 
 
 DART_EXPORT void Dart_RegisterRootServiceRequestCallback(
     const char* name,
     Dart_ServiceRequestCallback callback,
     void* user_data) {
   Service::RegisterRootEmbedderCallback(name, callback, user_data);
 }
 
 }  // namespace dart