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 
MCLabel(unsigned instance)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.
getInstance()37   unsigned getInstance() const { return Instance; }
38 
39   /// Increment the current instance of this Directional Local Label.
incInstance()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