Function markAsFree

bolt/common/memory/HashStringAllocator.cpp:63–70

Sets kFree flag in the 'header' and writes the size of the block to the last 4 bytes of the block. Sets kPreviousFree flag in the next block's 'header'.

/// last 4 bytes of the block. Sets kPreviousFree flag in the next block's
/// 'header'.
void markAsFree(HashStringAllocator::Header* FOLLY_NONNULL header) {
  header->setFree();
  auto nextHeader = header->next();
  if (nextHeader) {
    nextHeader->setPreviousFree();
    *previousFreeSize(nextHeader) = header->size();
  }
}
} // namespace

std::string HashStringAllocator::Header::toString() {