1//===-- llvm/Target/Mangler.h - Self-contained name mangler -----*- 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// Unified name mangler for various backends.
11//
12//===----------------------------------------------------------------------===//
13
14#ifndef LLVM_SUPPORT_MANGLER_H
15#define LLVM_SUPPORT_MANGLER_H
16
17#include "llvm/ADT/DenseMap.h"
18
19namespace llvm {
20class StringRef;
21class Twine;
22class Value;
23class GlobalValue;
24template <typename T> class SmallVectorImpl;
25class MCContext;
26class MCSymbol;
27class TargetData;
28
29class Mangler {
30public:
31  enum ManglerPrefixTy {
32    Default,               ///< Emit default string before each symbol.
33    Private,               ///< Emit "private" prefix before each symbol.
34    LinkerPrivate          ///< Emit "linker private" prefix before each symbol.
35  };
36
37private:
38  MCContext &Context;
39  const TargetData &TD;
40
41  /// AnonGlobalIDs - We need to give global values the same name every time
42  /// they are mangled.  This keeps track of the number we give to anonymous
43  /// ones.
44  ///
45  DenseMap<const GlobalValue*, unsigned> AnonGlobalIDs;
46
47  /// NextAnonGlobalID - This simple counter is used to unique value names.
48  ///
49  unsigned NextAnonGlobalID;
50
51public:
52  Mangler(MCContext &context, const TargetData &td)
53    : Context(context), TD(td), NextAnonGlobalID(1) {}
54
55  /// getSymbol - Return the MCSymbol for the specified global value.  This
56  /// symbol is the main label that is the address of the global.
57  MCSymbol *getSymbol(const GlobalValue *GV);
58
59
60  /// getNameWithPrefix - Fill OutName with the name of the appropriate prefix
61  /// and the specified global variable's name.  If the global variable doesn't
62  /// have a name, this fills in a unique name for the global.
63  void getNameWithPrefix(SmallVectorImpl<char> &OutName, const GlobalValue *GV,
64                         bool isImplicitlyPrivate);
65
66  /// getNameWithPrefix - Fill OutName with the name of the appropriate prefix
67  /// and the specified name as the global variable name.  GVName must not be
68  /// empty.
69  void getNameWithPrefix(SmallVectorImpl<char> &OutName, const Twine &GVName,
70                         ManglerPrefixTy PrefixTy = Mangler::Default);
71};
72
73} // End llvm namespace
74
75#endif // LLVM_SUPPORT_MANGLER_H
76