Move prototype metadata from internal properties to prototype maps

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 4547 matching lines @@
 int Map::unused_property_fields() {
   return READ_BYTE_FIELD(this, kUnusedPropertyFieldsOffset);
 }
 
 
 void Map::set_unused_property_fields(int value) {
   WRITE_BYTE_FIELD(this, kUnusedPropertyFieldsOffset, Min(value, 255));
 }
 
 
-byte Map::bit_field() {
-  return READ_BYTE_FIELD(this, kBitFieldOffset);
-}
+byte Map::bit_field() const { return READ_BYTE_FIELD(this, kBitFieldOffset); }
 
 
 void Map::set_bit_field(byte value) {
   WRITE_BYTE_FIELD(this, kBitFieldOffset, value);
 }
 
 
-byte Map::bit_field2() {
-  return READ_BYTE_FIELD(this, kBitField2Offset);
-}
+byte Map::bit_field2() const { return READ_BYTE_FIELD(this, kBitField2Offset); }
 
 
 void Map::set_bit_field2(byte value) {
   WRITE_BYTE_FIELD(this, kBitField2Offset, value);
 }
 
 
 void Map::set_non_instance_prototype(bool value) {
   if (value) {
     set_bit_field(bit_field() | (1 << kHasNonInstancePrototype));
@@ skipping 42 matching lines @@
 
 bool Map::is_extensible() {
   return ((1 << kIsExtensible) & bit_field2()) != 0;
 }
 
 
 void Map::set_is_prototype_map(bool value) {
   set_bit_field2(IsPrototypeMapBits::update(bit_field2(), value));
 }
 
-bool Map::is_prototype_map() {
+bool Map::is_prototype_map() const {
   return IsPrototypeMapBits::decode(bit_field2());
 }
 
 
 void Map::set_dictionary_map(bool value) {
   uint32_t new_bit_field3 = DictionaryMap::update(bit_field3(), value);
   new_bit_field3 = IsUnstable::update(new_bit_field3, value);
   set_bit_field3(new_bit_field3);
 }
 
@@ skipping 673 matching lines @@
 
 
 void Map::set_bit_field3(uint32_t bits) {
   if (kInt32Size != kPointerSize) {
     WRITE_UINT32_FIELD(this, kBitField3Offset + kInt32Size, 0);
   }
   WRITE_UINT32_FIELD(this, kBitField3Offset, bits);
 }
 
 
-uint32_t Map::bit_field3() {
+uint32_t Map::bit_field3() const {
   return READ_UINT32_FIELD(this, kBitField3Offset);
 }
 
 
 LayoutDescriptor* Map::GetLayoutDescriptor() {
   return FLAG_unbox_double_fields ? layout_descriptor()
                                   : LayoutDescriptor::FastPointerLayout();
 }
 
 
@@ skipping 21 matching lines @@
   return GetIsolate()->heap()->undefined_value();
 }
 
 
 Map* Map::ElementsTransitionMap() {
   return TransitionArray::SearchSpecial(
       this, GetHeap()->elements_transition_symbol());
 }
 
 
-ACCESSORS(Map, raw_transitions, Object, kTransitionsOffset)
+ACCESSORS(Map, raw_transitions, Object, kTransitionsOrPrototypeInfoOffset)
+
+
+Object* Map::prototype_info() const {
+  DCHECK(is_prototype_map());
+  return READ_FIELD(this, Map::kTransitionsOrPrototypeInfoOffset);
+}
+
+
+void Map::set_prototype_info(Object* value, WriteBarrierMode mode) {
+  DCHECK(is_prototype_map());
+  WRITE_FIELD(this, Map::kTransitionsOrPrototypeInfoOffset, value);
+  CONDITIONAL_WRITE_BARRIER(
+      GetHeap(), this, Map::kTransitionsOrPrototypeInfoOffset, value, mode);
+}
 
 
 void Map::SetBackPointer(Object* value, WriteBarrierMode mode) {
   DCHECK(instance_type() >= FIRST_JS_RECEIVER_TYPE);
   DCHECK((value->IsUndefined() && GetBackPointer()->IsMap()) ||
          (value->IsMap() && GetBackPointer()->IsUndefined()));
   DCHECK(!value->IsMap() ||
          Map::cast(value)->GetConstructor() == constructor_or_backpointer());
   set_constructor_or_backpointer(value, mode);
 }
@@ skipping 39 matching lines @@
 ACCESSORS_TO_SMI(AccessorInfo, flag, kFlagOffset)
 ACCESSORS(AccessorInfo, expected_receiver_type, Object,
           kExpectedReceiverTypeOffset)
 
 ACCESSORS(ExecutableAccessorInfo, getter, Object, kGetterOffset)
 ACCESSORS(ExecutableAccessorInfo, setter, Object, kSetterOffset)
 ACCESSORS(ExecutableAccessorInfo, data, Object, kDataOffset)
 
 ACCESSORS(Box, value, Object, kValueOffset)
 
+ACCESSORS(PrototypeInfo, prototype_users, Object, kPrototypeUsersOffset)
+ACCESSORS(PrototypeInfo, validity_cell, Object, kValidityCellOffset)
+
 ACCESSORS(AccessorPair, getter, Object, kGetterOffset)
 ACCESSORS(AccessorPair, setter, Object, kSetterOffset)
 
 ACCESSORS(AccessCheckInfo, named_callback, Object, kNamedCallbackOffset)
 ACCESSORS(AccessCheckInfo, indexed_callback, Object, kIndexedCallbackOffset)
 ACCESSORS(AccessCheckInfo, data, Object, kDataOffset)
 
 ACCESSORS(InterceptorInfo, getter, Object, kGetterOffset)
 ACCESSORS(InterceptorInfo, setter, Object, kSetterOffset)
 ACCESSORS(InterceptorInfo, query, Object, kQueryOffset)
@@ skipping 2053 matching lines @@
 #undef READ_SHORT_FIELD
 #undef WRITE_SHORT_FIELD
 #undef READ_BYTE_FIELD
 #undef WRITE_BYTE_FIELD
 #undef NOBARRIER_READ_BYTE_FIELD
 #undef NOBARRIER_WRITE_BYTE_FIELD
 
 } }  // namespace v8::internal
 
 #endif  // V8_OBJECTS_INL_H_