1 //===-- Mangler.cpp - Self-contained c/asm llvm name mangler --------------===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // Unified name mangler for assembly backends.
12 //===----------------------------------------------------------------------===//
14 #include "llvm/Target/Mangler.h"
15 #include "llvm/GlobalValue.h"
16 #include "llvm/ADT/SmallString.h"
17 #include "llvm/ADT/Twine.h"
18 #include "llvm/Support/raw_ostream.h"
21 /// getNameWithPrefix - Fill OutName with the name of the appropriate prefix
22 /// and the specified name as the global variable name. GVName must not be
24 void Mangler::getNameWithPrefix(SmallVectorImpl<char> &OutName,
25 const Twine &GVName, ManglerPrefixTy PrefixTy) {
26 SmallString<256> TmpData;
27 StringRef Name = GVName.toStringRef(TmpData);
28 assert(!Name.empty() && "getNameWithPrefix requires non-empty name");
30 // If the global name is not led with \1, add the appropriate prefixes.
31 if (Name[0] != '\1') {
32 if (PrefixTy == Mangler::Private)
33 OutName.append(PrivatePrefix, PrivatePrefix+strlen(PrivatePrefix));
34 else if (PrefixTy == Mangler::LinkerPrivate)
35 OutName.append(LinkerPrivatePrefix,
36 LinkerPrivatePrefix+strlen(LinkerPrivatePrefix));
39 ; // Common noop, no prefix.
40 else if (Prefix[1] == 0)
41 OutName.push_back(Prefix[0]); // Common, one character prefix.
43 OutName.append(Prefix, Prefix+strlen(Prefix)); // Arbitrary prefix.
45 Name = Name.substr(1);
48 OutName.append(Name.begin(), Name.end());
52 /// getNameWithPrefix - Fill OutName with the name of the appropriate prefix
53 /// and the specified global variable's name. If the global variable doesn't
54 /// have a name, this fills in a unique name for the global.
55 void Mangler::getNameWithPrefix(SmallVectorImpl<char> &OutName,
56 const GlobalValue *GV,
57 bool isImplicitlyPrivate) {
58 // If this global has a name, handle it simply.
60 ManglerPrefixTy PrefixTy = Mangler::Default;
61 if (GV->hasPrivateLinkage() || isImplicitlyPrivate)
62 PrefixTy = Mangler::Private;
63 else if (GV->hasLinkerPrivateLinkage())
64 PrefixTy = Mangler::LinkerPrivate;
66 return getNameWithPrefix(OutName, GV->getName(), PrefixTy);
69 // If the global variable doesn't have a name, return a unique name for the
70 // global based on a numbering.
72 // Anonymous names always get prefixes.
73 if (GV->hasPrivateLinkage() || isImplicitlyPrivate)
74 OutName.append(PrivatePrefix, PrivatePrefix+strlen(PrivatePrefix));
75 else if (GV->hasLinkerPrivateLinkage())
76 OutName.append(LinkerPrivatePrefix,
77 LinkerPrivatePrefix+strlen(LinkerPrivatePrefix));;
78 OutName.append(Prefix, Prefix+strlen(Prefix));
80 // Get the ID for the global, assigning a new one if we haven't got one
82 unsigned &ID = AnonGlobalIDs[GV];
83 if (ID == 0) ID = NextAnonGlobalID++;
85 // Must mangle the global into a unique ID.
86 raw_svector_ostream(OutName) << "__unnamed_" << ID;
89 /// getNameWithPrefix - Fill OutName with the name of the appropriate prefix
90 /// and the specified global variable's name. If the global variable doesn't
91 /// have a name, this fills in a unique name for the global.
92 std::string Mangler::getNameWithPrefix(const GlobalValue *GV,
93 bool isImplicitlyPrivate) {
95 getNameWithPrefix(Buf, GV, isImplicitlyPrivate);
96 return std::string(Buf.begin(), Buf.end());
100 Mangler::Mangler(Module &M, const char *prefix, const char *privatePrefix,
101 const char *linkerPrivatePrefix)
102 : Prefix(prefix), PrivatePrefix(privatePrefix),
103 LinkerPrivatePrefix(linkerPrivatePrefix), NextAnonGlobalID(1) {