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crypto/vm/cells/VirtualCell.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
+#include "vm/cells/Cell.h"
+
+namespace vm {
+class VirtualCell : public Cell {
+ private:
+  struct PrivateTag {};
+
+ public:
+  static Ref<Cell> create(VirtualizationParameters virt, Ref<Cell> cell) {
+    if (cell->get_level() <= virt.get_level()) {
+      return cell;
+    }
+    return Ref<VirtualCell>{true, virt, std::move(cell), PrivateTag{}};
+  }
+
+  VirtualCell(VirtualizationParameters virt, Ref<Cell> cell, PrivateTag) : virt_(virt), cell_(std::move(cell)) {
+    CHECK(cell_->get_virtualization() <= virt_.get_virtualization());
+  }
+
+  // load interface
+  td::Result<LoadedCell> load_cell() const override {
+    TRY_RESULT(loaded_cell, cell_->load_cell());
+    loaded_cell.virt = loaded_cell.virt.apply(virt_);
+    return std::move(loaded_cell);
+  }
+
+  Ref<Cell> virtualize(VirtualizationParameters virt) const override {
+    auto new_virt = virt_.apply(virt);
+    if (new_virt == virt_) {
+      return Ref<Cell>(this);
+    }
+    return create(new_virt, cell_);
+  }
+
+  td::uint32 get_virtualization() const override {
+    return virt_.get_virtualization();
+  }
+
+  CellUsageTree::NodePtr get_tree_node() const override {
+    return cell_->get_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().apply(virt_.get_level());
+  }
+
+ protected:
+  const Hash do_get_hash(td::uint32 level) const override {
+    return cell_->get_hash(fix_level(level));
+  }
+  td::uint16 do_get_depth(td::uint32 level) const override {
+    return cell_->get_depth(fix_level(level));
+  }
+
+ private:
+  VirtualizationParameters virt_;
+  Ref<Cell> cell_;
+
+  int fix_level(int level) const {
+    return get_level_mask().apply(level).get_level();
+  }
+};
+}  // namespace vm