Variable.hpp

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/* Copyright 2022 - 2024 R. Thomas
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
#ifndef LIEF_DWARF_VARIABLE_H
#define LIEF_DWARF_VARIABLE_H
 
#include <memory>
 
#include "LIEF/visibility.h"
#include "LIEF/errors.hpp"
#include "LIEF/debug_loc.hpp"
#include "LIEF/DWARF/Type.hpp"
 
namespace LIEF {
namespace dwarf {
class Scope;
 
namespace details {
class Variable;
class VariableIt;
}
class LIEF_API Variable {
  public:
  class LIEF_API Iterator {
    public:
    using iterator_category = std::bidirectional_iterator_tag;
    using value_type = std::unique_ptr<Variable>;
    using difference_type = std::ptrdiff_t;
    using pointer = Variable*;
    using reference = std::unique_ptr<Variable>&;
    using implementation = details::VariableIt;
 
    class LIEF_API PointerProxy {
      // Inspired from LLVM's iterator_facade_base
      friend class Iterator;
      public:
      pointer operator->() const { return R.get(); }
 
      private:
      value_type R;
 
      template <typename RefT>
      PointerProxy(RefT &&R) : R(std::forward<RefT>(R)) {} // NOLINT(bugprone-forwarding-reference-overload)
    };
 
    Iterator(const Iterator&);
    Iterator(Iterator&&) noexcept;
    Iterator(std::unique_ptr<details::VariableIt> impl);
    ~Iterator();
 
    friend LIEF_API bool operator==(const Iterator& LHS, const Iterator& RHS);
    friend LIEF_API bool operator!=(const Iterator& LHS, const Iterator& RHS) {
      return !(LHS == RHS);
    }
 
    Iterator& operator++();
    Iterator& operator--();
 
    Iterator operator--(int) {
      Iterator tmp = *static_cast<Iterator*>(this);
      --*static_cast<Iterator *>(this);
      return tmp;
    }
 
    Iterator operator++(int) {
      Iterator tmp = *static_cast<Iterator*>(this);
      ++*static_cast<Iterator *>(this);
      return tmp;
    }
 
    std::unique_ptr<Variable> operator*() const;
 
    PointerProxy operator->() const {
      return static_cast<const Iterator*>(this)->operator*();
    }
 
    private:
    std::unique_ptr<details::VariableIt> impl_;
  };
 
  Variable(std::unique_ptr<details::Variable> impl);
  std::string name() const;
  std::string linkage_name() const;
  result<int64_t> address() const;
  result<uint64_t> size() const;
  bool is_constexpr() const;
  debug_location_t debug_location() const;
  std::unique_ptr<Type> type() const;
  std::unique_ptr<Scope> scope() const;
 
  ~Variable();
  private:
  std::unique_ptr<details::Variable> impl_;
};

}

}

#endif