LLVM  9.0.0svn
MCLabel.h
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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
This class represents lattice values for constants.
Definition: AllocatorList.h:23
Context object for machine code objects.
Definition: MCContext.h:62
MCLabel & operator=(const MCLabel &)=delete
unsigned incInstance()
Increment the current instance of this Directional Local Label.
Definition: MCLabel.h:40
void dump() const
Print the value to stderr.
Definition: MCLabel.cpp:22
unsigned getInstance() const
Get the current instance of this Directional Local Label.
Definition: MCLabel.h:37
void print(raw_ostream &OS) const
Print the value to the stream OS.
Definition: MCLabel.cpp:17
raw_ostream & operator<<(raw_ostream &OS, const APInt &I)
Definition: APInt.h:2038
Instances of this class represent a label name in the MC file, and MCLabel are created and uniqued by...
Definition: MCLabel.h:23
This class implements an extremely fast bulk output stream that can only output to a stream...
Definition: raw_ostream.h:45