Support for global var shortcuts in script contexts.

src/objects.cc

 // Copyright 2013 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 <iomanip>
 #include <sstream>
 
 #include "src/v8.h"
 
 #include "src/accessors.h"
@@ skipping 1784 matching lines @@
         // the descriptor array without using an explicit.
         old_map->InitializeDescriptors(
             old_map->GetHeap()->empty_descriptor_array(),
             LayoutDescriptor::FastPointerLayout());
         // Ensure that no transition was inserted for prototype migrations.
         DCHECK_EQ(0, TransitionArray::NumberOfTransitions(
                          old_map->raw_transitions()));
         DCHECK(new_map->GetBackPointer()->IsUndefined());
       }
     } else {
+      DCHECK(!object->IsGlobalObject());
       MigrateFastToSlow(object, new_map, expected_additional_properties);
     }
   } else {
+    if (object->IsGlobalObject()) {

[Toon Verwaest, 2015/07/01 09:28:55]

What case is this needed for?
Add a comment at least.

[Igor Sheludko, 2015/07/02 16:50:13]

Done.

+      Handle<Context> native_context(
+          GlobalObject::cast(*object)->native_context());
+      Handle<ScriptContextTable> script_contexts(
+          native_context->script_context_table());
+      for (int i = 0; i < script_contexts->used(); i++) {
+        Handle<Context> context =
+            ScriptContextTable::GetContext(script_contexts, i);
+        context->InvalidateGlobalSlots();
+      }
+    }
     // For slow-to-fast migrations JSObject::MigrateSlowToFast()
     // must be used instead.
     CHECK(new_map->is_dictionary_map());
 
     // Slow-to-slow migration is trivial.
     object->set_map(*new_map);
   }
 
   // Careful: Don't allocate here!
   // For some callers of this method, |object| might be in an inconsistent
@@ skipping 14332 matching lines @@
                                             Handle<Object> new_value) {
   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