Introduce a lookup cache class in the runtime system and use it for...

src/heap.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 104 matching lines @@
   V(Proxy, prototype_accessors)                         \
   V(JSObject, debug_event_listeners)                    \
   V(Dictionary, code_stubs)                             \
   V(Dictionary, non_monomorphic_cache)                  \
   V(Code, js_entry_code)                                \
   V(Code, js_construct_entry_code)                      \
   V(Code, c_entry_code)                                 \
   V(Code, c_entry_debug_break_code)                     \
   V(FixedArray, number_string_cache)                    \
   V(FixedArray, single_character_string_cache)          \
-  V(FixedArray, natives_source_cache)
+  V(FixedArray, natives_source_cache)                   \
+  V(Object, keyed_lookup_cache)
 
 
 #define ROOT_LIST(V)                                  \
   STRONG_ROOT_LIST(V)                                 \
   V(Object, symbol_table)
 
 #define SYMBOL_LIST(V)                                                   \
   V(Array_symbol, "Array")                                               \
   V(Object_symbol, "Object")                                             \
   V(Proto_symbol, "__proto__")                                           \
@@ skipping 496 matching lines @@
   static inline OldSpace* TargetSpace(HeapObject* object);
 
   // Sets the stub_cache_ (only used when expanding the dictionary).
   static void set_code_stubs(Dictionary* value) { code_stubs_ = value; }
 
   // Sets the non_monomorphic_cache_ (only used when expanding the dictionary).
   static void set_non_monomorphic_cache(Dictionary* value) {
     non_monomorphic_cache_ = value;
   }
 
+  // Gets, sets and clears the lookup cache used for keyed access.
+  static inline Object* GetKeyedLookupCache();
+  static inline void SetKeyedLookupCache(LookupCache* cache);
+  static inline void ClearKeyedLookupCache();
+
 #ifdef DEBUG
   static void Print();
   static void PrintHandles();
 
   // Verify the heap is in its normal state before or after a GC.
   static void Verify();
 
   // Report heap statistics.
   static void ReportHeapStatistics(const char* title);
   static void ReportCodeStatistics(const char* title);
@@ skipping 540 matching lines @@
   int marked_count_;
 
   // The count from the end of the previous full GC.  Will be zero if there
   // was no previous full GC.
   int previous_marked_count_;
 };
 
 } }  // namespace v8::internal
 
 #endif  // V8_HEAP_H_