Introduce instance type for transition arrays.

src/objects-inl.h

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 //
 // Review notes:
 //
 // - The use of macros in these inline functions may seem superfluous
 // but it is absolutely needed to make sure gcc generates optimal
 // code. gcc is not happy when attempting to inline too deep.
 //
@@ skipping 116 matching lines @@
   void holder::set_##name(bool value) {                    \
     set_##field(BooleanBit::set(field(), offset, value));  \
   }
 
 
 bool Object::IsFixedArrayBase() const {
   return IsFixedArray() || IsFixedDoubleArray() || IsFixedTypedArrayBase();
 }
 
 
+bool Object::IsFixedArray() const {
+  if (!IsHeapObject()) return false;
+  InstanceType instance_type = HeapObject::cast(this)->map()->instance_type();
+  return instance_type == FIXED_ARRAY_TYPE ||
+         instance_type == TRANSITION_ARRAY_TYPE;
+}
+
+
 // External objects are not extensible, so the map check is enough.
 bool Object::IsExternal() const {
   return Object::IsHeapObject() &&
       HeapObject::cast(this)->map() ==
       HeapObject::cast(this)->GetHeap()->external_map();
 }
 
 
 bool Object::IsAccessorInfo() const { return IsExecutableAccessorInfo(); }
 
@@ skipping 563 matching lines @@
 TYPE_CHECKER(JSFunctionProxy, JS_FUNCTION_PROXY_TYPE)
 TYPE_CHECKER(JSSet, JS_SET_TYPE)
 TYPE_CHECKER(JSMap, JS_MAP_TYPE)
 TYPE_CHECKER(JSSetIterator, JS_SET_ITERATOR_TYPE)
 TYPE_CHECKER(JSMapIterator, JS_MAP_ITERATOR_TYPE)
 TYPE_CHECKER(JSIteratorResult, JS_ITERATOR_RESULT_TYPE)
 TYPE_CHECKER(JSWeakMap, JS_WEAK_MAP_TYPE)
 TYPE_CHECKER(JSWeakSet, JS_WEAK_SET_TYPE)
 TYPE_CHECKER(JSContextExtensionObject, JS_CONTEXT_EXTENSION_OBJECT_TYPE)
 TYPE_CHECKER(Map, MAP_TYPE)
-TYPE_CHECKER(FixedArray, FIXED_ARRAY_TYPE)
 TYPE_CHECKER(FixedDoubleArray, FIXED_DOUBLE_ARRAY_TYPE)
 TYPE_CHECKER(WeakFixedArray, FIXED_ARRAY_TYPE)
+TYPE_CHECKER(TransitionArray, TRANSITION_ARRAY_TYPE)
 
 
 bool Object::IsJSWeakCollection() const {
   return IsJSWeakMap() || IsJSWeakSet();
 }
 
 
 bool Object::IsDescriptorArray() const {
   return IsFixedArray();
 }
 
 
 bool Object::IsArrayList() const { return IsFixedArray(); }
 
 
 bool Object::IsLayoutDescriptor() const {
   return IsSmi() || IsFixedTypedArrayBase();
 }
 
 
-bool Object::IsTransitionArray() const {
-  return IsFixedArray();
-}
-
-
 bool Object::IsTypeFeedbackVector() const { return IsFixedArray(); }
 
 
 bool Object::IsTypeFeedbackMetadata() const { return IsFixedArray(); }
 
 
 bool Object::IsLiteralsArray() const { return IsFixedArray(); }
 bool Object::IsBindingsArray() const { return IsFixedArray(); }
 
 
@@ skipping 1631 matching lines @@
   DCHECK(map() != GetHeap()->fixed_cow_array_map());
   DCHECK(index >= 0 && index < this->length());
   DCHECK(reinterpret_cast<Object*>(value)->IsSmi());
   int offset = kHeaderSize + index * kPointerSize;
   WRITE_FIELD(this, offset, value);
 }
 
 
 void FixedArray::set(int index, Object* value) {
   DCHECK_NE(GetHeap()->fixed_cow_array_map(), map());
-  DCHECK_EQ(FIXED_ARRAY_TYPE, map()->instance_type());
+  DCHECK(IsFixedArray());
   DCHECK(index >= 0 && index < this->length());
   int offset = kHeaderSize + index * kPointerSize;
   WRITE_FIELD(this, offset, value);
   WRITE_BARRIER(GetHeap(), this, offset, value);
 }
 
 
 double FixedDoubleArray::get_scalar(int index) {
   DCHECK(map() != GetHeap()->fixed_cow_array_map() &&
          map() != GetHeap()->fixed_array_map());
@@ skipping 2029 matching lines @@
   return CopyInstallDescriptors(map, new_descriptor, descriptors,
                                 layout_descriptor);
 }
 
 
 int HeapObject::SizeFromMap(Map* map) {
   int instance_size = map->instance_size();
   if (instance_size != kVariableSizeSentinel) return instance_size;
   // Only inline the most frequent cases.
   InstanceType instance_type = map->instance_type();
-  if (instance_type == FIXED_ARRAY_TYPE) {
+  if (instance_type == FIXED_ARRAY_TYPE ||
+      instance_type == TRANSITION_ARRAY_TYPE) {
     return FixedArray::SizeFor(
         reinterpret_cast<FixedArray*>(this)->synchronized_length());
   }
   if (instance_type == ONE_BYTE_STRING_TYPE ||
       instance_type == ONE_BYTE_INTERNALIZED_STRING_TYPE) {
     // Strings may get concurrently truncated, hence we have to access its
     // length synchronized.
     return SeqOneByteString::SizeFor(
         reinterpret_cast<SeqOneByteString*>(this)->synchronized_length());
   }
@@ skipping 3396 matching lines @@
 #undef WRITE_INT64_FIELD
 #undef READ_BYTE_FIELD
 #undef WRITE_BYTE_FIELD
 #undef NOBARRIER_READ_BYTE_FIELD
 #undef NOBARRIER_WRITE_BYTE_FIELD
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_OBJECTS_INL_H_