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