Elide hole checks on KeyedLoads of holey double 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 94 matching lines @@
   V(STRING_FUNCTION_PROTOTYPE_MAP_INDEX, Map, string_function_prototype_map) \
   V(SYMBOL_FUNCTION_INDEX, JSFunction, symbol_function) \
   V(OBJECT_FUNCTION_INDEX, JSFunction, object_function) \
   V(INTERNAL_ARRAY_FUNCTION_INDEX, JSFunction, internal_array_function) \
   V(ARRAY_FUNCTION_INDEX, JSFunction, array_function) \
   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(INITIAL_ARRAY_PROTOTYPE_INDEX, JSObject, initial_array_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) \
   V(TO_UINT32_FUN_INDEX, JSFunction, to_uint32_fun) \
   V(TO_INT32_FUN_INDEX, JSFunction, to_int32_fun) \
   V(GLOBAL_EVAL_FUN_INDEX, JSFunction, global_eval_fun) \
   V(INSTANTIATE_FUN_INDEX, JSFunction, instantiate_fun) \
@@ skipping 131 matching lines @@
     ALIASED_ARGUMENTS_BOILERPLATE_INDEX,
     STRICT_MODE_ARGUMENTS_BOILERPLATE_INDEX,
     REGEXP_RESULT_MAP_INDEX,
     FUNCTION_MAP_INDEX,
     STRICT_MODE_FUNCTION_MAP_INDEX,
     FUNCTION_WITHOUT_PROTOTYPE_MAP_INDEX,
     STRICT_MODE_FUNCTION_WITHOUT_PROTOTYPE_MAP_INDEX,
     FUNCTION_INSTANCE_MAP_INDEX,
     STRICT_MODE_FUNCTION_INSTANCE_MAP_INDEX,
     INITIAL_OBJECT_PROTOTYPE_INDEX,
+    INITIAL_ARRAY_PROTOTYPE_INDEX,
     BOOLEAN_FUNCTION_INDEX,
     NUMBER_FUNCTION_INDEX,
     STRING_FUNCTION_INDEX,
     STRING_FUNCTION_PROTOTYPE_MAP_INDEX,
     SYMBOL_FUNCTION_INDEX,
     OBJECT_FUNCTION_INDEX,
     INTERNAL_ARRAY_FUNCTION_INDEX,
     ARRAY_FUNCTION_INDEX,
     JS_ARRAY_MAPS_INDEX,
     DATE_FUNCTION_INDEX,
@@ skipping 151 matching lines @@
   Object* OptimizedFunctionsListHead();
   void ClearOptimizedFunctions();
 
   Handle<Object> ErrorMessageForCodeGenerationFromStrings();
 
 #define NATIVE_CONTEXT_FIELD_ACCESSORS(index, type, name) \
   void  set_##name(type* value) {                         \
     ASSERT(IsNativeContext());                            \
     set(index, value);                                    \
   }                                                       \
+  bool is_##name(type* value) {                           \
+    ASSERT(IsNativeContext());                            \
+    return type::cast(get(index)) == value;               \
+  }                                                       \
   type* name() {                                          \
     ASSERT(IsNativeContext());                            \
     return type::cast(get(index));                        \
   }
   NATIVE_CONTEXT_FIELDS(NATIVE_CONTEXT_FIELD_ACCESSORS)
 #undef NATIVE_CONTEXT_FIELD_ACCESSORS
 
   // Lookup the slot called name, starting with the current context.
   // There are three possibilities:
   //
@@ skipping 53 matching lines @@
   static bool IsBootstrappingOrGlobalObject(Object* object);
 #endif
 
   STATIC_CHECK(kHeaderSize == Internals::kContextHeaderSize);
   STATIC_CHECK(EMBEDDER_DATA_INDEX == Internals::kContextEmbedderDataIndex);
 };
 
 } }  // namespace v8::internal
 
 #endif  // V8_CONTEXTS_H_