Implement tracking and optimizations of packed arrays.

src/contexts.h

 // Copyright 2012 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 88 matching lines @@
 #define GLOBAL_CONTEXT_FIELDS(V) \
   V(GLOBAL_PROXY_INDEX, JSObject, global_proxy_object) \
   V(SECURITY_TOKEN_INDEX, Object, security_token) \
   V(BOOLEAN_FUNCTION_INDEX, JSFunction, boolean_function) \
   V(NUMBER_FUNCTION_INDEX, JSFunction, number_function) \
   V(STRING_FUNCTION_INDEX, JSFunction, string_function) \
   V(STRING_FUNCTION_PROTOTYPE_MAP_INDEX, Map, string_function_prototype_map) \
   V(OBJECT_FUNCTION_INDEX, JSFunction, object_function) \
   V(INTERNAL_ARRAY_FUNCTION_INDEX, JSFunction, internal_array_function) \
   V(ARRAY_FUNCTION_INDEX, JSFunction, array_function) \
-  V(SMI_JS_ARRAY_MAP_INDEX, Object, smi_js_array_map) \
-  V(DOUBLE_JS_ARRAY_MAP_INDEX, Object, double_js_array_map) \
-  V(OBJECT_JS_ARRAY_MAP_INDEX, Object, object_js_array_map) \
+  V(JS_ARRAY_MAPS_INDEX, Object, js_array_maps) \
   V(DATE_FUNCTION_INDEX, JSFunction, date_function) \
   V(JSON_OBJECT_INDEX, JSObject, json_object) \
   V(REGEXP_FUNCTION_INDEX, JSFunction, regexp_function) \
   V(INITIAL_OBJECT_PROTOTYPE_INDEX, JSObject, initial_object_prototype) \
   V(CREATE_DATE_FUN_INDEX, JSFunction,  create_date_fun) \
   V(TO_NUMBER_FUN_INDEX, JSFunction, to_number_fun) \
   V(TO_STRING_FUN_INDEX, JSFunction, to_string_fun) \
   V(TO_DETAIL_STRING_FUN_INDEX, JSFunction, to_detail_string_fun) \
   V(TO_OBJECT_FUN_INDEX, JSFunction, to_object_fun) \
   V(TO_INTEGER_FUN_INDEX, JSFunction, to_integer_fun) \
@@ skipping 119 matching lines @@
     FUNCTION_INSTANCE_MAP_INDEX,
     STRICT_MODE_FUNCTION_INSTANCE_MAP_INDEX,
     INITIAL_OBJECT_PROTOTYPE_INDEX,
     BOOLEAN_FUNCTION_INDEX,
     NUMBER_FUNCTION_INDEX,
     STRING_FUNCTION_INDEX,
     STRING_FUNCTION_PROTOTYPE_MAP_INDEX,
     OBJECT_FUNCTION_INDEX,
     INTERNAL_ARRAY_FUNCTION_INDEX,
     ARRAY_FUNCTION_INDEX,
-    SMI_JS_ARRAY_MAP_INDEX,
-    DOUBLE_JS_ARRAY_MAP_INDEX,
-    OBJECT_JS_ARRAY_MAP_INDEX,
+    JS_ARRAY_MAPS_INDEX,
     DATE_FUNCTION_INDEX,
     JSON_OBJECT_INDEX,
     REGEXP_FUNCTION_INDEX,
     CREATE_DATE_FUN_INDEX,
     TO_NUMBER_FUN_INDEX,
     TO_STRING_FUN_INDEX,
     TO_DETAIL_STRING_FUN_INDEX,
     TO_OBJECT_FUN_INDEX,
     TO_INTEGER_FUN_INDEX,
     TO_UINT32_FUN_INDEX,
@@ skipping 102 matching lines @@
 
   // Mark the global context with out of memory.
   inline void mark_out_of_memory();
 
   // A global context hold a list of all functions which have been optimized.
   void AddOptimizedFunction(JSFunction* function);
   void RemoveOptimizedFunction(JSFunction* function);
   Object* OptimizedFunctionsListHead();
   void ClearOptimizedFunctions();
 
-  static int GetContextMapIndexFromElementsKind(
-      ElementsKind elements_kind) {
-    if (elements_kind == FAST_DOUBLE_ELEMENTS) {
-      return Context::DOUBLE_JS_ARRAY_MAP_INDEX;
-    } else if (elements_kind == FAST_ELEMENTS) {
-      return Context::OBJECT_JS_ARRAY_MAP_INDEX;
-    } else {
-      ASSERT(elements_kind == FAST_SMI_ONLY_ELEMENTS);
-      return Context::SMI_JS_ARRAY_MAP_INDEX;
-    }
-  }
-
 #define GLOBAL_CONTEXT_FIELD_ACCESSORS(index, type, name) \
   void  set_##name(type* value) {                         \
     ASSERT(IsGlobalContext());                            \
     set(index, value);                                    \
   }                                                       \
   type* name() {                                          \
     ASSERT(IsGlobalContext());                            \
     return type::cast(get(index));                        \
   }
   GLOBAL_CONTEXT_FIELDS(GLOBAL_CONTEXT_FIELD_ACCESSORS)
@@ skipping 45 matching lines @@
 #ifdef DEBUG
   // Bootstrapping-aware type checks.
   static bool IsBootstrappingOrContext(Object* object);
   static bool IsBootstrappingOrGlobalObject(Object* object);
 #endif
 };
 
 } }  // namespace v8::internal
 
 #endif  // V8_CONTEXTS_H_