Speed up access to global variables from eval scopes. Traverse the...

src/contexts.h

 // Copyright 2006-2008 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 286 matching lines @@
   //    the result is the JSObject extension context or the global object,
   //    and the name is the property name, and the property exists.
   //    attributes != ABSENT.
   //
   // 4) index_ < 0 && result.is_null():
   //    there was no context found with the corresponding property.
   //    attributes == ABSENT.
   Handle<Object> Lookup(Handle<String> name, ContextLookupFlags flags,
                         int* index_, PropertyAttributes* attributes);
 
+  // Determine if a local variable with the given name exists in a
+  // context.  Do not consider context extension objects.  This is
+  // used for compiling code using eval.  If the context surrounding
+  // the eval call does not have a local variable with this name and
+  // does not contain a with statement the property is global unless
+  // it is shadowed by a property in an extension object introduced by
+  // eval.
+  bool GlobalIfNotShadowedByEval(Handle<String> name);
+
   // Code generation support.
   static int SlotOffset(int index) {
     return kHeaderSize + index * kPointerSize - kHeapObjectTag;
   }
 
  private:
   // Unchecked access to the slots.
   Object* unchecked_previous() { return get(PREVIOUS_INDEX); }
   Object* unchecked_extension() { return get(EXTENSION_INDEX); }
 
 #ifdef DEBUG
   // Bootstrapping-aware type checks.
   static bool IsBootstrappingOrContext(Object* object);
   static bool IsBootstrappingOrGlobalObject(Object* object);
 #endif
 };
 
 } }  // namespace v8::internal
 
 #endif  // V8_CONTEXTS_H_