Arguments object has @@iterator

src/bootstrapper.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/bootstrapper.h"
 
 #include "src/accessors.h"
 #include "src/code-stubs.h"
 #include "src/extensions/externalize-string-extension.h"
 #include "src/extensions/free-buffer-extension.h"
@@ skipping 1186 matching lines @@
     {  // length
       FieldDescriptor d(factory->length_string(), Heap::kArgumentsLengthIndex,
                         DONT_ENUM, Representation::Tagged());
       map->AppendDescriptor(&d);
     }
     {  // callee
       FieldDescriptor d(factory->callee_string(), Heap::kArgumentsCalleeIndex,
                         DONT_ENUM, Representation::Tagged());
       map->AppendDescriptor(&d);
     }
+    // @@iterator method is added later.
 
     map->set_function_with_prototype(true);
     map->set_pre_allocated_property_fields(2);
     map->set_inobject_properties(2);
     native_context()->set_sloppy_arguments_map(*map);
 
     DCHECK(!function->has_initial_map());
     JSFunction::SetInitialMap(function, map,
                               isolate->initial_object_prototype());
 
@@ skipping 38 matching lines @@
       map->AppendDescriptor(&d);
     }
     {  // callee
       CallbacksDescriptor d(factory->callee_string(), callee, attributes);
       map->AppendDescriptor(&d);
     }
     {  // caller
       CallbacksDescriptor d(factory->caller_string(), caller, attributes);
       map->AppendDescriptor(&d);
     }
+    // @@iterator method is added later.
 
     map->set_function_with_prototype(true);
     map->set_prototype(native_context()->object_function()->prototype());
     map->set_pre_allocated_property_fields(1);
     map->set_inobject_properties(1);
 
     // Copy constructor from the sloppy arguments boilerplate.
     map->set_constructor(
         native_context()->sloppy_arguments_map()->constructor());
 
@@ skipping 314 matching lines @@
                  observers_end_perform_splice);
   INSTALL_NATIVE(JSFunction, "NativeObjectObserve",
                  native_object_observe);
   INSTALL_NATIVE(JSFunction, "NativeObjectGetNotifier",
                  native_object_get_notifier);
   INSTALL_NATIVE(JSFunction, "NativeObjectNotifierPerformChange",
                  native_object_notifier_perform_change);
 
   INSTALL_NATIVE(Symbol, "symbolIterator", iterator_symbol);
   INSTALL_NATIVE(Symbol, "symbolUnscopables", unscopables_symbol);
+  INSTALL_NATIVE(JSFunction, "ArrayValues", array_values_iterator);
 
   INSTALL_NATIVE_MATH(abs)
   INSTALL_NATIVE_MATH(acos)
   INSTALL_NATIVE_MATH(asin)
   INSTALL_NATIVE_MATH(atan)
   INSTALL_NATIVE_MATH(atan2)
   INSTALL_NATIVE_MATH(ceil)
   INSTALL_NATIVE_MATH(cos)
   INSTALL_NATIVE_MATH(exp)
   INSTALL_NATIVE_MATH(floor)
@@ skipping 423 matching lines @@
       initial_map->AppendDescriptor(&input_field);
     }
 
     initial_map->set_inobject_properties(2);
     initial_map->set_pre_allocated_property_fields(2);
     initial_map->set_unused_property_fields(0);
 
     native_context()->set_regexp_result_map(*initial_map);
   }
 
+  // Add @@iterator method to the arguments object maps.
+  {
+    PropertyAttributes attribs = DONT_ENUM;
+    Handle<AccessorInfo> arguments_iterator =
+        Accessors::ArgumentsIteratorInfo(isolate(), attribs);
+    {
+      CallbacksDescriptor d(Handle<Name>(native_context()->iterator_symbol()),
+                            arguments_iterator, attribs);
+      Handle<Map> map(native_context()->sloppy_arguments_map());
+      Map::EnsureDescriptorSlack(map, 1);
+      map->AppendDescriptor(&d);
+    }
+    {
+      CallbacksDescriptor d(Handle<Name>(native_context()->iterator_symbol()),
+                            arguments_iterator, attribs);
+      Handle<Map> map(native_context()->aliased_arguments_map());
+      Map::EnsureDescriptorSlack(map, 1);
+      map->AppendDescriptor(&d);
+    }
+    {
+      CallbacksDescriptor d(Handle<Name>(native_context()->iterator_symbol()),
+                            arguments_iterator, attribs);
+      Handle<Map> map(native_context()->strict_arguments_map());
+      Map::EnsureDescriptorSlack(map, 1);
+      map->AppendDescriptor(&d);
+    }
+  }
+
 #ifdef VERIFY_HEAP
   builtins->ObjectVerify();
 #endif
 
   return true;
 }
 
 
 #define INSTALL_EXPERIMENTAL_NATIVE(i, flag, file)                \
   if (FLAG_harmony_##flag &&                                      \
@@ skipping 638 matching lines @@
   return from + sizeof(NestingCounterType);
 }
 
 
 // Called when the top-level V8 mutex is destroyed.
 void Bootstrapper::FreeThreadResources() {
   DCHECK(!IsActive());
 }
 
 } }  // namespace v8::internal