Rewrite Object.prototype.toString in C++

src/builtins.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/builtins.h"
 
 #include "src/api.h"
 #include "src/api-natives.h"
 #include "src/arguments.h"
 #include "src/base/once.h"
@@ skipping 1736 matching lines @@
   HandleScope scope(isolate);
   // The ConstructStub is executed in the context of the caller, so we need
   // to enter the callee context first before raising an exception.
   isolate->set_context(args.target()->context());
   THROW_NEW_ERROR_RETURN_FAILURE(
       isolate, NewTypeError(MessageTemplate::kNotConstructor,
                             isolate->factory()->Symbol_string()));
 }
 
 
+// ES6 19.1.3.6 Object.prototype.toString
+BUILTIN(ObjectProtoToString) {
+  HandleScope scope(isolate);
+  Handle<Object> object = args.at<Object>(0);
+  Handle<String> result;
+  ASSIGN_RETURN_FAILURE_ON_EXCEPTION(
+      isolate, result, JSObject::ObjectProtoToString(isolate, object));
+  return *result;
+}
+
+
 namespace {
 
 // ES6 section 9.5.15 ProxyCreate (target, handler)
 MaybeHandle<JSProxy> ProxyCreate(Isolate* isolate, Handle<Object> target,
                                  Handle<Object> handler) {
   if (!target->IsJSReceiver()) {
     THROW_NEW_ERROR(
         isolate, NewTypeError(MessageTemplate::kProxyTargetNonObject), JSProxy);
   }
   if (target->IsJSProxy() && JSProxy::cast(*target)->IsRevoked()) {
@@ skipping 668 matching lines @@
 BUILTIN_LIST_C(DEFINE_BUILTIN_ACCESSOR_C)
 BUILTIN_LIST_A(DEFINE_BUILTIN_ACCESSOR_A)
 BUILTIN_LIST_H(DEFINE_BUILTIN_ACCESSOR_H)
 BUILTIN_LIST_DEBUG_A(DEFINE_BUILTIN_ACCESSOR_A)
 #undef DEFINE_BUILTIN_ACCESSOR_C
 #undef DEFINE_BUILTIN_ACCESSOR_A
 
 
 }  // namespace internal
 }  // namespace v8