initial commit

crypto/vm/cells/CellWithStorage.h

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+/*
+    This file is part of TON Blockchain Library.
+
+    TON Blockchain Library is free software: you can redistribute it and/or modify
+    it under the terms of the GNU Lesser General Public License as published by
+    the Free Software Foundation, either version 2 of the License, or
+    (at your option) any later version.
+
+    TON Blockchain Library is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU Lesser General Public License for more details.
+
+    You should have received a copy of the GNU Lesser General Public License
+    along with TON Blockchain Library.  If not, see <http://www.gnu.org/licenses/>.
+
+    Copyright 2017-2019 Telegram Systems LLP
+*/
+#pragma once
+
+namespace vm {
+namespace detail {
+template <class CellT, size_t Size = 0>
+class CellWithArrayStorage : public CellT {
+ public:
+  template <class... ArgsT>
+  CellWithArrayStorage(ArgsT&&... args) : CellT(std::forward<ArgsT>(args)...) {
+  }
+  ~CellWithArrayStorage() {
+    CellT::destroy_storage(get_storage());
+  }
+  template <class... ArgsT>
+  static std::unique_ptr<CellT> create(size_t storage_size, ArgsT&&... args) {
+    static_assert(CellT::max_storage_size <= 40 * 8, "");
+    //size = 128 + 32 + 8;
+    auto size = (storage_size + 7) / 8;
+#define CASE(size) \
+  case (size):     \
+    return std::make_unique<CellWithArrayStorage<CellT, (size)*8>>(std::forward<ArgsT>(args)...);
+#define CASE2(offset) CASE(offset) CASE(offset + 1)
+#define CASE8(offset) CASE2(offset) CASE2(offset + 2) CASE2(offset + 4) CASE2(offset + 6)
+#define CASE32(offset) CASE8(offset) CASE8(offset + 8) CASE8(offset + 16) CASE8(offset + 24)
+    switch (size) { CASE32(0) CASE8(32) }
+#undef CASE
+#undef CASE2
+#undef CASE8
+#undef CASE32
+    LOG(FATAL) << "TOO BIG " << storage_size;
+    UNREACHABLE();
+  }
+
+ private:
+  alignas(alignof(void*)) char storage_[Size];
+
+  const char* get_storage() const final {
+    return storage_;
+  }
+  char* get_storage() final {
+    return storage_;
+  }
+};
+
+template <class CellT>
+class CellWithUniquePtrStorage : public CellT {
+ public:
+  template <class... ArgsT>
+  CellWithUniquePtrStorage(size_t storage_size, ArgsT&&... args)
+      : CellT(std::forward<ArgsT>(args)...), storage_(std::make_unique<char[]>(storage_size)) {
+  }
+  ~CellWithUniquePtrStorage() {
+    CellT::destroy_storage(get_storage());
+  }
+
+  template <class... ArgsT>
+  static std::unique_ptr<CellT> create(size_t storage_size, ArgsT&&... args) {
+    return std::make_unique<CellWithUniquePtrStorage>(storage_size, std::forward<ArgsT>(args)...);
+  }
+
+ private:
+  std::unique_ptr<char[]> storage_;
+
+  const char* get_storage() const final {
+    CHECK(storage_);
+    return storage_.get();
+  }
+  char* get_storage() final {
+    CHECK(storage_);
+    return storage_.get();
+  }
+};
+}  // namespace detail
+}  // namespace vm