extern.h

// This file if part of the llir-opt project.
// Licensing information can be found in the LICENSE file.
// (C) 2018 Nandor Licker. All rights reserved.
 
#pragma once
 
#include <string>
#include <llvm/ADT/ilist_node.h>
 
#include "core/global.h"
#include "core/symbol_table.h"
 
class Prog;
 
 
 
class Extern final : public llvm::ilist_node_with_parent<Extern, Prog>, public Global {
public:
  static constexpr Global::Kind kGlobalKind = Global::Kind::EXTERN;
 
public:
  Extern(
      const std::string_view name,
      Visibility visibility = Visibility::GLOBAL_DEFAULT
  );
 
  Extern(
      const std::string_view name,
      const std::string_view section,
      Visibility visibility = Visibility::GLOBAL_DEFAULT
  );
 
  ~Extern() override;
 
  Prog *getParent() { return parent_; }
 
  void removeFromParent() override;
  void eraseFromParent() override;
 
  std::optional<llvm::Align> GetAlignment() const override
  {
    return std::nullopt;
  }
 
  void SetValue(Ref<Value> g);
  Ref<Value> GetValue() { return Get<0>(); }
  ConstRef<Value> GetValue() const { return Get<0>(); }
 
  bool HasValue() const { return GetValue(); }
 
  Prog *getProg() override { return parent_; }
 
  void SetSection(const std::string_view section) { section_ = section; }
  std::optional<const std::string_view> GetSection() const { return section_; }
 
  void dump(llvm::raw_ostream &os = llvm::errs()) const override;
 
private:
  friend struct SymbolTableListTraits<Extern>;
  void setParent(Prog *parent) { parent_ = parent; }
 
private:
  Prog *parent_;
  std::optional<std::string> section_;
};