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 CWriter and assembly backends.
12 //===----------------------------------------------------------------------===//
14 #include "llvm/Support/Mangler.h"
15 #include "llvm/DerivedTypes.h"
16 #include "llvm/Module.h"
17 #include "llvm/ADT/STLExtras.h"
18 #include "llvm/ADT/StringExtras.h"
19 #include "llvm/ADT/StringMap.h"
22 static char HexDigit(int V) {
23 return V < 10 ? V+'0' : V+'A'-10;
26 static std::string MangleLetter(unsigned char C) {
27 char Result[] = { '_', HexDigit(C >> 4), HexDigit(C & 15), '_', 0 };
31 /// makeNameProper - We don't want identifier names non-C-identifier characters
32 /// in them, so mangle them as appropriate.
34 std::string Mangler::makeNameProper(const std::string &X,
35 ManglerPrefixTy PrefixTy) {
36 assert(!X.empty() && "Cannot mangle empty strings");
41 // If X does not start with (char)1, add the prefix.
42 bool NeedPrefix = true;
43 std::string::const_iterator I = X.begin();
46 ++I; // Skip over the marker.
49 // Mangle the first letter specially, don't allow numbers.
50 if (*I >= '0' && *I <= '9')
51 Result += MangleLetter(*I++);
53 for (std::string::const_iterator E = X.end(); I != E; ++I) {
54 if (!isCharAcceptable(*I))
55 Result += MangleLetter(*I);
61 Result = Prefix + Result;
63 if (PrefixTy == Mangler::Private)
64 Result = PrivatePrefix + Result;
65 else if (PrefixTy == Mangler::LinkerPrivate)
66 Result = LinkerPrivatePrefix + Result;
72 bool NeedPrefix = true;
73 bool NeedQuotes = false;
75 std::string::const_iterator I = X.begin();
78 ++I; // Skip over the marker.
81 // If the first character is a number, we need quotes.
82 if (*I >= '0' && *I <= '9')
85 // Do an initial scan of the string, checking to see if we need quotes or
86 // to escape a '"' or not.
88 for (std::string::const_iterator E = X.end(); I != E; ++I)
89 if (!isCharAcceptable(*I)) {
94 // In the common case, we don't need quotes. Handle this quickly.
97 return X.substr(1); // Strip off the \001.
101 if (PrefixTy == Mangler::Private)
102 Result = PrivatePrefix + Result;
103 else if (PrefixTy == Mangler::LinkerPrivate)
104 Result = LinkerPrivatePrefix + Result;
109 Result = X.substr(0, I-X.begin());
111 // Otherwise, construct the string the expensive way.
112 for (std::string::const_iterator E = X.end(); I != E; ++I) {
122 Result = Prefix + Result;
124 if (PrefixTy == Mangler::Private)
125 Result = PrivatePrefix + Result;
126 else if (PrefixTy == Mangler::LinkerPrivate)
127 Result = LinkerPrivatePrefix + Result;
130 Result = '"' + Result + '"';
134 /// getMangledName - Returns the mangled name of V, an LLVM Value,
135 /// in the current module. If 'Suffix' is specified, the name ends with the
136 /// specified suffix. If 'ForcePrivate' is specified, the label is specified
137 /// to have a private label prefix.
139 std::string Mangler::getMangledName(const GlobalValue *GV, const char *Suffix,
141 assert((!isa<Function>(GV) || !cast<Function>(GV)->isIntrinsic()) &&
142 "Intrinsic functions cannot be mangled by Mangler");
144 ManglerPrefixTy PrefixTy =
145 (GV->hasPrivateLinkage() || ForcePrivate) ? Mangler::Private :
146 GV->hasLinkerPrivateLinkage() ? Mangler::LinkerPrivate : Mangler::Default;
149 return makeNameProper(GV->getNameStr() + Suffix, PrefixTy);
151 // Get the ID for the global, assigning a new one if we haven't got one
153 unsigned &ID = AnonGlobalIDs[GV];
154 if (ID == 0) ID = NextAnonGlobalID++;
156 // Must mangle the global into a unique ID.
157 return makeNameProper("__unnamed_" + utostr(ID) + Suffix, PrefixTy);
160 Mangler::Mangler(Module &M, const char *prefix, const char *privatePrefix,
161 const char *linkerPrivatePrefix)
162 : Prefix(prefix), PrivatePrefix(privatePrefix),
163 LinkerPrivatePrefix(linkerPrivatePrefix), UseQuotes(false),
164 NextAnonGlobalID(1) {
165 std::fill(AcceptableChars, array_endof(AcceptableChars), 0);
167 // Letters and numbers are acceptable.
168 for (unsigned char X = 'a'; X <= 'z'; ++X)
169 markCharAcceptable(X);
170 for (unsigned char X = 'A'; X <= 'Z'; ++X)
171 markCharAcceptable(X);
172 for (unsigned char X = '0'; X <= '9'; ++X)
173 markCharAcceptable(X);
175 // These chars are acceptable.
176 markCharAcceptable('_');
177 markCharAcceptable('$');
178 markCharAcceptable('.');