Never return a Dart_Handle on a dart::Class from the embedding 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 0ba963874243a898bbf5c806f178c2eddd889f34..09390bfcb093090633ea765d459971826511b03e 100644
--- a/runtime/vm/dart_api_impl.cc
+++ b/runtime/vm/dart_api_impl.cc
@@ -1304,14 +1304,6 @@ DART_EXPORT bool Dart_IsType(Dart_Handle handle) {
 }
 
 
-DART_EXPORT bool Dart_IsClass(Dart_Handle handle) {
-  Isolate* isolate = Isolate::Current();
-  DARTSCOPE(isolate);
-  const Object& obj = Object::Handle(isolate, Api::UnwrapHandle(handle));
-  return obj.IsClass();
-}
-
-
 DART_EXPORT bool Dart_IsFunction(Dart_Handle handle) {
   TRACE_API_CALL(CURRENT_FUNC);
   return Api::ClassId(handle) == kFunctionCid;
@@ -1356,17 +1348,6 @@ DART_EXPORT Dart_Handle Dart_InstanceGetType(Dart_Handle instance) {
   return Api::NewHandle(isolate, type.Canonicalize());
 }
 
-// TODO(asiva): Deprecate this method.
-DART_EXPORT Dart_Handle Dart_InstanceGetClass(Dart_Handle instance) {
-  Isolate* isolate = Isolate::Current();
-  DARTSCOPE(isolate);
-  const Instance& obj = Api::UnwrapInstanceHandle(isolate, instance);
-  if (obj.IsNull()) {
-    RETURN_TYPE_ERROR(isolate, instance, Instance);
-  }
-  return Api::NewHandle(isolate, obj.clazz());
-}
-
 
 // --- Numbers, Integers and Doubles ----
 
@@ -2841,29 +2822,15 @@ DART_EXPORT Dart_Handle Dart_New(Dart_Handle type,
   }
 
   // Get the class to instantiate.
-  result = Api::UnwrapHandle(type);
-  if (result.IsNull()) {
-    RETURN_TYPE_ERROR(isolate, type, Type);
-  }
-  Class& cls = Class::Handle(isolate);
-  AbstractTypeArguments& type_arguments =
-      AbstractTypeArguments::Handle(isolate);
-
-  if (result.IsType()) {
-    cls = Type::Cast(result).type_class();
-    type_arguments = Type::Cast(result).arguments();
-  } else if (result.IsClass()) {
-    // For backwards compatibility we allow class objects to be passed in
-    // for now. This needs to be removed once all code that uses class
-    // objects to invoke Dart_New is removed.
-    cls ^= result.raw();
-    type_arguments = Type::Handle(cls.RareType()).arguments();
-  } else {
+  const Type& type_obj = Api::UnwrapTypeHandle(isolate, type);
+  if (type_obj.IsNull()) {
     RETURN_TYPE_ERROR(isolate, type, Type);
   }
+  Class& cls = Class::Handle(isolate, type_obj.type_class());
+  const AbstractTypeArguments& type_arguments =
+      AbstractTypeArguments::Handle(isolate, type_obj.arguments());
 
-  String& base_constructor_name = String::Handle();
-  base_constructor_name = cls.Name();
+  const String& base_constructor_name = String::Handle(isolate, cls.Name());
 
   // And get the name of the constructor to invoke.
   String& dot_name = String::Handle(isolate);
@@ -2965,23 +2932,13 @@ DART_EXPORT Dart_Handle Dart_Allocate(Dart_Handle type) {
   Isolate* isolate = Isolate::Current();
   DARTSCOPE(isolate);
   CHECK_CALLBACK_STATE(isolate);
-  const Object& result = Object::Handle(isolate, Api::UnwrapHandle(type));
 
+  const Type& type_obj = Api::UnwrapTypeHandle(isolate, type);
   // Get the class to instantiate.
-  if (result.IsNull()) {
-    RETURN_TYPE_ERROR(isolate, type, Type);
-  }
-  Class& cls = Class::Handle(isolate);
-  if (result.IsType()) {
-    cls = Type::Cast(result).type_class();
-  } else if (result.IsClass()) {
-    // For backwards compatibility we allow class objects to be passed in
-    // for now. This needs to be removed once all code that uses class
-    // objects to invoke Dart_New is removed.
-    cls ^= result.raw();
-  } else {
+  if (type_obj.IsNull()) {
     RETURN_TYPE_ERROR(isolate, type, Type);
   }
+  const Class& cls = Class::Handle(isolate, type_obj.type_class());
 
   // Allocate an object for the given class.
   return Api::NewHandle(isolate, Instance::New(cls));
@@ -3030,22 +2987,14 @@ DART_EXPORT Dart_Handle Dart_Invoke(Dart_Handle target,
     args.SetAt((i + num_receiver), arg);
   }
 
-  if (obj.IsType() || obj.IsClass()) {
+  if (obj.IsType()) {
     // Finalize all classes.
     Dart_Handle state = Api::CheckIsolateState(isolate);
     if (::Dart_IsError(state)) {
       return state;
     }
 
-    // For backwards compatibility we allow class objects to be passed in
-    // for now. This needs to be removed once all code that uses class
-    // objects to invoke Dart_Invoke is removed.
-    Class& cls = Class::Handle();
-    if (obj.IsType()) {
-      cls = Type::Cast(obj).type_class();
-    } else {
-      cls = Class::Cast(obj).raw();
-    }
+    const Class& cls = Class::Handle(isolate, Type::Cast(obj).type_class());
     const Function& function = Function::Handle(
         isolate,
         Resolver::ResolveStatic(cls,
@@ -3092,8 +3041,9 @@ DART_EXPORT Dart_Handle Dart_Invoke(Dart_Handle target,
       return state;
     }
 
-    Function& function = Function::Handle(isolate);
-    function = lib.LookupFunctionAllowPrivate(function_name);
+    const Function& function =
+        Function::Handle(isolate,
+                         lib.LookupFunctionAllowPrivate(function_name));
     if (function.IsNull()) {
       return Api::NewError("%s: did not find top-level function '%s'.",
                            CURRENT_FUNC,
@@ -3188,18 +3138,11 @@ DART_EXPORT Dart_Handle Dart_GetField(Dart_Handle container, Dart_Handle name) {
   if (obj.IsNull()) {
     return Api::NewError("%s expects argument 'container' to be non-null.",
                          CURRENT_FUNC);
-  } else if (obj.IsType() || obj.IsClass()) {
+  } else if (obj.IsType()) {
     // To access a static field we may need to use the Field or the
     // getter Function.
-    // For backwards compatibility we allow class objects to be passed in
-    // for now. This needs to be removed once all code that uses class
-    // objects to invoke Dart_GetField is removed.
-    Class& cls = Class::Handle();
-    if (obj.IsType()) {
-      cls = Type::Cast(obj).type_class();
-    } else {
-      cls = Class::Cast(obj).raw();
-    }
+    Class& cls = Class::Handle(isolate, Type::Cast(obj).type_class());
+
     field = cls.LookupStaticField(field_name);
     if (field.IsNull() || FieldIsUninitialized(isolate, field)) {
       const String& getter_name =
@@ -3320,18 +3263,11 @@ DART_EXPORT Dart_Handle Dart_SetField(Dart_Handle container,
   if (obj.IsNull()) {
     return Api::NewError("%s expects argument 'container' to be non-null.",
                          CURRENT_FUNC);
-  } else if (obj.IsType() || obj.IsClass()) {
+  } else if (obj.IsType()) {
     // To access a static field we may need to use the Field or the
     // setter Function.
-    // For backwards compatibility we allow class objects to be passed in
-    // for now. This needs to be removed once all code that uses class
-    // objects to invoke Dart_SetField is removed.
-    Class& cls = Class::Handle();
-    if (obj.IsType()) {
-      cls = Type::Cast(obj).type_class();
-    } else {
-      cls = Class::Cast(obj).raw();
-    }
+    Class& cls = Class::Handle(isolate, Type::Cast(obj).type_class());
+
     field = cls.LookupStaticField(field_name);
     if (field.IsNull()) {
       String& setter_name =
@@ -3550,7 +3486,7 @@ DART_EXPORT Dart_Handle Dart_CreateNativeWrapperClass(Dart_Handle library,
     return Api::NewError(
         "Unable to create native wrapper class : already exists");
   }
-  return Api::NewHandle(isolate, cls.raw());
+  return Api::NewHandle(isolate, cls.RareType());
 }
 
 
@@ -4034,7 +3970,7 @@ DART_EXPORT Dart_Handle Dart_GetClass(Dart_Handle library,
     return Api::NewError("Class '%s' not found in library '%s'.",
                          cls_name.ToCString(), lib_name.ToCString());
   }
-  return Api::NewHandle(isolate, cls.raw());
+  return Api::NewHandle(isolate, cls.RareType());
 }