Allow closures to be optimized if outer contexts that call eval are all in strict mode.

src/scopeinfo.h

-// Copyright 2006-2008 the V8 project authors. All rights reserved.
+// Copyright 2011 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
 //       with the distribution.
@@ skipping 74 matching lines @@
   // --------------------------------------------------------------------------
   // Debugging support
 
 #ifdef DEBUG
   void Print();
 #endif
 
  private:
   Handle<String> function_name_;
   bool calls_eval_;
+  bool is_strict_mode_;
   List<Handle<String>, Allocator > parameters_;
   List<Handle<String>, Allocator > stack_slots_;
   List<Handle<String>, Allocator > context_slots_;
   List<Variable::Mode, Allocator > context_modes_;
 };
 
 
 // This object provides quick access to scope info details for runtime
 // routines w/o the need to explicitly create a ScopeInfo object.
 class SerializedScopeInfo : public FixedArray {
  public :
 
   static SerializedScopeInfo* cast(Object* object) {
     ASSERT(object->IsFixedArray());
     return reinterpret_cast<SerializedScopeInfo*>(object);
   }
 
   // Does this scope call eval?
   bool CallsEval();
 
+  // Is this scope a strict mode scope?
+  bool IsStrictMode();
+
   // Does this scope have an arguments shadow?
   bool HasArgumentsShadow() {
     return StackSlotIndex(GetHeap()->arguments_shadow_symbol()) >= 0;
   }
 
   // Return the number of stack slots for code.
   int NumberOfStackSlots();
 
   // Return the number of context slots for code.
   int NumberOfContextSlots();
@@ skipping 115 matching lines @@
   uint32_t values_[kLength];
 
   friend class Isolate;
   DISALLOW_COPY_AND_ASSIGN(ContextSlotCache);
 };
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_SCOPEINFO_H_