Implement ES6 rest parameters

src/factory.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/factory.h"
 
 #include "src/allocation-site-scopes.h"
 #include "src/base/bits.h"
 #include "src/conversions.h"
 #include "src/isolate-inl.h"
@@ skipping 2201 matching lines @@
 
   // Link debug info to function.
   shared->set_debug_info(*debug_info);
 
   return debug_info;
 }
 
 
 Handle<JSObject> Factory::NewArgumentsObject(Handle<JSFunction> callee,
                                              int length) {
-  bool strict_mode_callee = is_strict(callee->shared()->language_mode());
+  bool strict_mode_callee = is_strict(callee->shared()->language_mode()) ||
+                            !callee->is_simple_parameter_list();
   Handle<Map> map = strict_mode_callee ? isolate()->strict_arguments_map()
                                        : isolate()->sloppy_arguments_map();
 
   AllocationSiteUsageContext context(isolate(), Handle<AllocationSite>(),
                                      false);
   DCHECK(!isolate()->has_pending_exception());
   Handle<JSObject> result = NewJSObjectFromMap(map);
   Handle<Smi> value(Smi::FromInt(length), isolate());
   Object::SetProperty(result, length_string(), value, STRICT).Assert();
   if (!strict_mode_callee) {
@@ skipping 95 matching lines @@
   return Handle<Object>::null();
 }
 
 
 Handle<Object> Factory::ToBoolean(bool value) {
   return value ? true_value() : false_value();
 }
 
 
 } }  // namespace v8::internal