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  1. //===- MCLabel.h - Machine Code Directional Local Labels --------*- C++ -*-===//
  2. //
  3. // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
  4. // See https://llvm.org/LICENSE.txt for license information.
  5. // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
  6. //
  7. //===----------------------------------------------------------------------===//
  8. //
  9. // This file contains the declaration of the MCLabel class.
  10. //
  11. //===----------------------------------------------------------------------===//
  12.  
  13. #ifndef LLVM_MC_MCLABEL_H
  14. #define LLVM_MC_MCLABEL_H
  15.  
  16. namespace llvm {
  17.  
  18. class raw_ostream;
  19.  
  20. /// Instances of this class represent a label name in the MC file,
  21. /// and MCLabel are created and uniqued by the MCContext class.  MCLabel
  22. /// should only be constructed for valid instances in the object file.
  23. class MCLabel {
  24.   // The instance number of this Directional Local Label.
  25.   unsigned Instance;
  26.  
  27. private: // MCContext creates and uniques these.
  28.   friend class MCContext;
  29.  
  30.   MCLabel(unsigned instance) : Instance(instance) {}
  31.  
  32. public:
  33.   MCLabel(const MCLabel &) = delete;
  34.   MCLabel &operator=(const MCLabel &) = delete;
  35.  
  36.   /// Get the current instance of this Directional Local Label.
  37.   unsigned getInstance() const { return Instance; }
  38.  
  39.   /// Increment the current instance of this Directional Local Label.
  40.   unsigned incInstance() { return ++Instance; }
  41.  
  42.   /// Print the value to the stream \p OS.
  43.   void print(raw_ostream &OS) const;
  44.  
  45.   /// Print the value to stderr.
  46.   void dump() const;
  47. };
  48.  
  49. inline raw_ostream &operator<<(raw_ostream &OS, const MCLabel &Label) {
  50.   Label.print(OS);
  51.   return OS;
  52. }
  53.  
  54. } // end namespace llvm
  55.  
  56. #endif // LLVM_MC_MCLABEL_H
  57.