llvm-mirror/include/llvm/MC/MCLabel.h

//===- MCLabel.h - Machine Code Directional Local Labels --------*- C++ -*-===//
//
//                     The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file contains the declaration of the MCLabel class.
//
//===----------------------------------------------------------------------===//

#ifndef LLVM_MC_MCLABEL_H
#define LLVM_MC_MCLABEL_H

#include "llvm/Support/Compiler.h"

namespace llvm {
class MCContext;
class raw_ostream;

/// \brief Instances of this class represent a label name in the MC file,
/// and MCLabel are created and uniqued by the MCContext class.  MCLabel
/// should only be constructed for valid instances in the object file.
class MCLabel {
  // \brief The instance number of this Directional Local Label.
  unsigned Instance;

private: // MCContext creates and uniques these.
  friend class MCContext;
  MCLabel(unsigned instance) : Instance(instance) {}

  MCLabel(const MCLabel &) = delete;
  void operator=(const MCLabel &) = delete;

public:
  /// \brief Get the current instance of this Directional Local Label.
  unsigned getInstance() const { return Instance; }

  /// \brief Increment the current instance of this Directional Local Label.
  unsigned incInstance() { return ++Instance; }

  /// \brief Print the value to the stream \p OS.
  void print(raw_ostream &OS) const;

  /// \brief Print the value to stderr.
  void dump() const;
};

inline raw_ostream &operator<<(raw_ostream &OS, const MCLabel &Label) {
  Label.print(OS);
  return OS;
}
} // end namespace llvm

#endif