[stubs] Unify (and optimize) implementation of ToObject.

src/execution.cc

 // Copyright 2014 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/execution.h"
 
 #include "src/bootstrapper.h"
 #include "src/codegen.h"
 #include "src/deoptimizer.h"
 #include "src/messages.h"
@@ skipping 530 matching lines @@
   RETURN_NATIVE_CALL(to_string, { obj });
 }
 
 
 MaybeHandle<Object> Execution::ToDetailString(
     Isolate* isolate, Handle<Object> obj) {
   RETURN_NATIVE_CALL(to_detail_string, { obj });
 }
 
 
-MaybeHandle<Object> Execution::ToObject(
-    Isolate* isolate, Handle<Object> obj) {
-  if (obj->IsSpecObject()) return obj;
-  // TODO(verwaest): Use Object::ToObject but throw an exception on failure.
-  RETURN_NATIVE_CALL(to_object, { obj });
-}
-
-
 MaybeHandle<Object> Execution::ToInteger(
     Isolate* isolate, Handle<Object> obj) {
   RETURN_NATIVE_CALL(to_integer, { obj });
 }
 
 
 MaybeHandle<Object> Execution::ToUint32(
     Isolate* isolate, Handle<Object> obj) {
   RETURN_NATIVE_CALL(to_uint32, { obj });
 }
@@ skipping 13 matching lines @@
 
 MaybeHandle<Object> Execution::NewDate(Isolate* isolate, double time) {
   Handle<Object> time_obj = isolate->factory()->NewNumber(time);
   RETURN_NATIVE_CALL(create_date, { time_obj });
 }
 
 
 #undef RETURN_NATIVE_CALL
 
 
+MaybeHandle<Object> Execution::ToObject(Isolate* isolate, Handle<Object> obj) {
+  Handle<JSReceiver> receiver;
+  if (JSReceiver::ToObject(isolate, obj).ToHandle(&receiver)) {
+    return receiver;
+  }
+  THROW_NEW_ERROR(
+      isolate, NewTypeError(MessageTemplate::kUndefinedOrNullToObject), Object);
+}
+
+
 MaybeHandle<JSRegExp> Execution::NewJSRegExp(Handle<String> pattern,
                                              Handle<String> flags) {
   Isolate* isolate = pattern->GetIsolate();
   Handle<JSFunction> function = Handle<JSFunction>(
       isolate->native_context()->regexp_function());
   Handle<Object> re_obj;
   ASSIGN_RETURN_ON_EXCEPTION(
       isolate, re_obj,
       RegExpImpl::CreateRegExpLiteral(function, pattern, flags),
       JSRegExp);
@@ skipping 57 matching lines @@
 
   isolate_->counters()->stack_interrupts()->Increment();
   isolate_->counters()->runtime_profiler_ticks()->Increment();
   isolate_->runtime_profiler()->OptimizeNow();
 
   return isolate_->heap()->undefined_value();
 }
 
 }  // namespace internal
 }  // namespace v8