[api] Expose instanceof through v8::Value::InstanceOf.

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 4076 matching lines @@
   return self->SameValue(*other);
 }
 
 Local<String> Value::TypeOf(v8::Isolate* external_isolate) {
   i::Isolate* isolate = reinterpret_cast<i::Isolate*>(external_isolate);
   ENTER_V8_NO_SCRIPT_NO_EXCEPTION(isolate);
   LOG_API(isolate, Value, TypeOf);
   return Utils::ToLocal(i::Object::TypeOf(isolate, Utils::OpenHandle(this)));
 }
 
+Maybe<bool> Value::InstanceOf(v8::Local<v8::Context> context,
+                              v8::Local<v8::Object> object) {
+  PREPARE_FOR_EXECUTION_PRIMITIVE(context, Value, InstanceOf, bool);
+  auto left = Utils::OpenHandle(this);
+  auto right = Utils::OpenHandle(*object);
+  i::Handle<i::Object> result;
+  has_pending_exception =
+      !i::Object::InstanceOf(isolate, left, right).ToHandle(&result);
+  RETURN_ON_FAILED_EXECUTION_PRIMITIVE(bool);
+  return Just(result->IsTrue(isolate));
+}
+
 Maybe<bool> v8::Object::Set(v8::Local<v8::Context> context,
                             v8::Local<Value> key, v8::Local<Value> value) {
   PREPARE_FOR_EXECUTION_PRIMITIVE(context, 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();
   RETURN_ON_FAILED_EXECUTION_PRIMITIVE(bool);
@@ skipping 1173 matching lines @@
   auto self = Utils::OpenHandle(this);
   if (self->IsJSBoundFunction()) {
     auto bound_function = i::Handle<i::JSBoundFunction>::cast(self);
     auto bound_target_function = i::handle(
         bound_function->bound_target_function(), bound_function->GetIsolate());
     return Utils::CallableToLocal(bound_target_function);
   }
   return v8::Undefined(reinterpret_cast<v8::Isolate*>(self->GetIsolate()));
 }
 
-
 int Name::GetIdentityHash() {
   auto self = Utils::OpenHandle(this);
   return static_cast<int>(self->Hash());
 }
 
 
 int String::Length() const {
   i::Handle<i::String> str = Utils::OpenHandle(this);
   return str->length();
 }
@@ skipping 5016 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