Put empty pages discovered during sweeping to the end of the list of pages...

src/spaces-inl.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 127 matching lines @@
 }
 
 
 bool Page::IsRSetSet(Address address, int offset) {
   uint32_t bitmask = 0;
   Address rset_address = ComputeRSetBitPosition(address, offset, &bitmask);
   return (Memory::uint32_at(rset_address) & bitmask) != 0;
 }
 
 
+bool Page::GetPageFlag(PageFlag flag) {
+  return (flags & flag) != 0;
+}
+
+
+void Page::SetPageFlag(PageFlag flag, bool value) {
+  if (value) {
+    flags |= flag;
+  } else {
+    flags &= ~flag;
+  }
+}
+
+
+bool Page::WasInUseBeforeMC() {
+  return GetPageFlag(WAS_IN_USE_BEFORE_MC);
+}
+
+
+void Page::SetWasInUseBeforeMC(bool was_in_use) {
+  SetPageFlag(WAS_IN_USE_BEFORE_MC, was_in_use);
+}
+
+
+bool Page::IsLargeObjectPage() {
+  return !GetPageFlag(IS_NORMAL_PAGE);
+}
+
+
+void Page::SetIsLargeObjectPage(bool is_large_object_page) {
+  SetPageFlag(IS_NORMAL_PAGE, !is_large_object_page);
+}
+
+
 // -----------------------------------------------------------------------------
 // MemoryAllocator
 
 bool MemoryAllocator::IsValidChunk(int chunk_id) {
   if (!IsValidChunkId(chunk_id)) return false;
 
   ChunkInfo& c = chunks_[chunk_id];
   return (c.address() != NULL) && (c.size() != 0) && (c.owner() != NULL);
 }
 
@@ skipping 179 matching lines @@
 
 bool FreeListNode::IsFreeListNode(HeapObject* object) {
   return object->map() == Heap::raw_unchecked_byte_array_map()
       || object->map() == Heap::raw_unchecked_one_pointer_filler_map()
       || object->map() == Heap::raw_unchecked_two_pointer_filler_map();
 }
 
 } }  // namespace v8::internal
 
 #endif  // V8_SPACES_INL_H_