[V8] Add v8::Value::TypeOf to API

src/api.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/api.h"
 
 #include <string.h>  // For memcpy, strlen.
 #ifdef V8_USE_ADDRESS_SANITIZER
 #include <sanitizer/asan_interface.h>
 #endif  // V8_USE_ADDRESS_SANITIZER
@@ skipping 3497 matching lines @@
   return self->StrictEquals(*other);
 }
 
 
 bool Value::SameValue(Local<Value> that) const {
   auto self = Utils::OpenHandle(this);
   auto other = Utils::OpenHandle(*that);
   return self->SameValue(*other);
 }
 
+MaybeLocal<String> Value::TypeOf(v8::Local<v8::Context> context) {
+  PREPARE_FOR_EXECUTION(context, "TypeOf", String);
+  i::Handle<i::String> result =
+      i::Object::TypeOf(isolate, Utils::OpenHandle(this));
+  has_pending_exception = result.is_null();

[jochen (gone - plz use gerrit), 2016/03/30 16:15:13]

sorry for not catching this earlier, but as far as I can tell, result can never
be null. 

[kozy, 2016/05/06 17:03:13]

Rewritten without PREPATE_FOR_EXECUTION

+  RETURN_ON_FAILED_EXECUTION(String);
+  RETURN_ESCAPED(Utils::ToLocal(result));
+}
 
 Maybe<bool> v8::Object::Set(v8::Local<v8::Context> context,
                             v8::Local<Value> key, v8::Local<Value> value) {
   PREPARE_FOR_EXECUTION_PRIMITIVE(context, "v8::Object::Set()", bool);
   auto self = Utils::OpenHandle(this);
   auto key_obj = Utils::OpenHandle(*key);
   auto value_obj = Utils::OpenHandle(*value);
   has_pending_exception =
       i::Runtime::SetObjectProperty(isolate, self, key_obj, value_obj,
                                     i::SLOPPY).is_null();
@@ skipping 5228 matching lines @@
   Address callback_address =
       reinterpret_cast<Address>(reinterpret_cast<intptr_t>(callback));
   VMState<EXTERNAL> state(isolate);
   ExternalCallbackScope call_scope(isolate, callback_address);
   callback(info);
 }
 
 
 }  // namespace internal
 }  // namespace v8