initial commit

crypto/vm/cells/UsageCell.h

@@ -0,0 +1,88 @@
+/*
+    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
+#include "vm/cells/Cell.h"
+#include "vm/cells/CellUsageTree.h"
+
+namespace vm {
+class UsageCell : public Cell {
+ private:
+  struct PrivateTag {};
+
+ public:
+  UsageCell(Ref<Cell> cell, CellUsageTree::NodePtr tree_node, PrivateTag)
+      : cell_(std::move(cell)), tree_node_(std::move(tree_node)) {
+  }
+  static Ref<Cell> create(Ref<Cell> cell, CellUsageTree::NodePtr tree_node) {
+    if (tree_node.empty()) {
+      return cell;
+    }
+    return Ref<UsageCell>{true, std::move(cell), std::move(tree_node), PrivateTag{}};
+  }
+
+  // load interface
+  td::Result<LoadedCell> load_cell() const override {
+    TRY_RESULT(loaded_cell, cell_->load_cell());
+    if (tree_node_.on_load()) {
+      CHECK(loaded_cell.tree_node.empty());
+      loaded_cell.tree_node = tree_node_;
+    }
+    return std::move(loaded_cell);
+  }
+  Ref<Cell> virtualize(VirtualizationParameters virt) const override {
+    auto virtualized_cell = cell_->virtualize(virt);
+    if (tree_node_.empty()) {
+      return virtualized_cell;
+    }
+    if (virtualized_cell.get() == cell_.get()) {
+      return Ref<Cell>(this);
+    }
+    return create(std::move(virtualized_cell), tree_node_);
+  }
+
+  td::uint32 get_virtualization() const override {
+    return cell_->get_virtualization();
+  }
+
+  CellUsageTree::NodePtr get_tree_node() const override {
+    return tree_node_;
+  }
+
+  bool is_loaded() const override {
+    return cell_->is_loaded();
+  }
+
+  // hash and level
+  LevelMask get_level_mask() const override {
+    return cell_->get_level_mask();
+  }
+
+ protected:
+  const Hash do_get_hash(td::uint32 level) const override {
+    return cell_->get_hash(level);
+  }
+  td::uint16 do_get_depth(td::uint32 level) const override {
+    return cell_->get_depth(level);
+  }
+
+ private:
+  Ref<Cell> cell_;
+  CellUsageTree::NodePtr tree_node_;
+};
+}  // namespace vm