1 //===- MCLabel.h - Machine Code Directional Local Labels --------*- C++ -*-===//
2 //
3 //                     The LLVM Compiler Infrastructure
4 //
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
7 //
8 //===----------------------------------------------------------------------===//
9 //
10 // This file contains the declaration of the MCLabel class.
11 //
12 //===----------------------------------------------------------------------===//
13 
14 #ifndef LLVM_MC_MCLABEL_H
15 #define LLVM_MC_MCLABEL_H
16 
17 #include "llvm/Support/Compiler.h"
18 
19 namespace llvm {
20 class MCContext;
21 class raw_ostream;
22 
23 /// \brief Instances of this class represent a label name in the MC file,
24 /// and MCLabel are created and uniqued by the MCContext class.  MCLabel
25 /// should only be constructed for valid instances in the object file.
26 class MCLabel {
27   // \brief The instance number of this Directional Local Label.
28   unsigned Instance;
29 
30 private: // MCContext creates and uniques these.
31   friend class MCContext;
MCLabel(unsigned instance)32   MCLabel(unsigned instance) : Instance(instance) {}
33 
34   MCLabel(const MCLabel &) = delete;
35   void operator=(const MCLabel &) = delete;
36 
37 public:
38   /// \brief Get the current instance of this Directional Local Label.
getInstance()39   unsigned getInstance() const { return Instance; }
40 
41   /// \brief Increment the current instance of this Directional Local Label.
incInstance()42   unsigned incInstance() { return ++Instance; }
43 
44   /// \brief Print the value to the stream \p OS.
45   void print(raw_ostream &OS) const;
46 
47   /// \brief Print the value to stderr.
48   void dump() const;
49 };
50 
51 inline raw_ostream &operator<<(raw_ostream &OS, const MCLabel &Label) {
52   Label.print(OS);
53   return OS;
54 }
55 } // end namespace llvm
56 
57 #endif
58