+static inline
+const char* to_cstr(RegionType region)
+{
+ switch (region) {
+ case RegionType::Unknown:
+ return "unknown";
+ case RegionType::Heap:
+ return "Heap";
+ case RegionType::Data:
+ return "Data";
+ default:
+ return "?";
+ }
+}
+
+Buffer::Buffer(std::size_t size, Type type) : size_(size), type_(type)
+{
+ switch(type_) {
+ case Type::Malloc:
+ data_ = ::operator new(size_);
+ break;
+ case Type::Mmap:
+ data_ = ::mmap(nullptr, size, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS|MAP_POPULATE, -1, 0);
+ if (data_ == MAP_FAILED) {
+ data_ = nullptr;
+ size_ = 0;
+ type_ = Type::Malloc;
+ throw std::bad_alloc();
+ }
+ break;
+ default:
+ abort();
+ }
+}
+
+void Buffer::clear() noexcept
+{
+ switch(type_) {
+ case Type::Malloc:
+ ::operator delete(data_);
+ break;
+ case Type::Mmap:
+ if (munmap(data_, size_) != 0)
+ abort();
+ break;
+ default:
+ abort();
+ }
+ data_ = nullptr;
+ size_ = 0;
+ type_ = Type::Malloc;
+}
+