[runtime] Unify the ToObject handling.

src/objects.cc

 // Copyright 2015 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/objects.h"
 
 #include <cmath>
 #include <iomanip>
 #include <sstream>
 
@@ skipping 80 matching lines @@
                                          Handle<Object> object,
                                          Handle<Context> native_context) {
   if (object->IsJSReceiver()) return Handle<JSReceiver>::cast(object);
   Handle<JSFunction> constructor;
   if (object->IsSmi()) {
     constructor = handle(native_context->number_function(), isolate);
   } else {
     int constructor_function_index =
         Handle<HeapObject>::cast(object)->map()->GetConstructorFunctionIndex();
     if (constructor_function_index == Map::kNoConstructorFunctionIndex) {
-      return MaybeHandle<JSReceiver>();
+      THROW_NEW_ERROR(isolate,
+                      NewTypeError(MessageTemplate::kUndefinedOrNullToObject),
+                      JSReceiver);
     }
     constructor = handle(
         JSFunction::cast(native_context->get(constructor_function_index)),
         isolate);
   }
   Handle<JSObject> result = isolate->factory()->NewJSObject(constructor);
   Handle<JSValue>::cast(result)->set_value(*object);
   return result;
 }
 
@@ skipping 16434 matching lines @@
   DCHECK(!storage || storage->length() == counter);
   return counter;
 }
 
 
 MaybeHandle<String> Object::ObjectProtoToString(Isolate* isolate,
                                                 Handle<Object> object) {
   if (object->IsUndefined()) return isolate->factory()->undefined_to_string();
   if (object->IsNull()) return isolate->factory()->null_to_string();
 
-  Handle<JSReceiver> receiver;
-  CHECK(Object::ToObject(isolate, object).ToHandle(&receiver));
+  Handle<JSReceiver> receiver =
+      Object::ToObject(isolate, object).ToHandleChecked();
 
   Handle<String> tag;
   if (FLAG_harmony_tostring) {
     Handle<Object> to_string_tag;
     ASSIGN_RETURN_ON_EXCEPTION(
         isolate, to_string_tag,
         GetProperty(receiver, isolate->factory()->to_string_tag_symbol()),
         String);
     if (to_string_tag->IsString()) {
       tag = Handle<String>::cast(to_string_tag);
@@ skipping 3097 matching lines @@
   if (cell->value() != *new_value) {
     cell->set_value(*new_value);
     Isolate* isolate = cell->GetIsolate();
     cell->dependent_code()->DeoptimizeDependentCodeGroup(
         isolate, DependentCode::kPropertyCellChangedGroup);
   }
 }
 
 }  // namespace internal
 }  // namespace v8