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, const char *Prefix,
35 const char *PrivatePrefix) {
36 if (X.empty()) return X; // Empty names are uniqued by the caller.
38 // If PreserveAsmNames is set, names with asm identifiers are not modified.
39 if (PreserveAsmNames && X[0] == 1)
45 // If X does not start with (char)1, add the prefix.
46 bool NeedPrefix = true;
47 std::string::const_iterator I = X.begin();
50 ++I; // Skip over the marker.
53 // Mangle the first letter specially, don't allow numbers.
54 if (*I >= '0' && *I <= '9')
55 Result += MangleLetter(*I++);
57 for (std::string::const_iterator E = X.end(); I != E; ++I) {
58 if (!isCharAcceptable(*I))
59 Result += MangleLetter(*I);
66 Result = Prefix + Result;
68 Result = PrivatePrefix + Result;
73 bool NeedPrefix = true;
74 bool NeedQuotes = false;
76 std::string::const_iterator I = X.begin();
79 ++I; // Skip over the marker.
82 // If the first character is a number, we need quotes.
83 if (*I >= '0' && *I <= '9')
86 // Do an initial scan of the string, checking to see if we need quotes or
87 // to escape a '"' or not.
89 for (std::string::const_iterator E = X.end(); I != E; ++I)
90 if (!isCharAcceptable(*I)) {
95 // In the common case, we don't need quotes. Handle this quickly.
103 Result = PrivatePrefix + Result;
109 // Otherwise, construct the string the expensive way.
110 for (std::string::const_iterator E = X.end(); I != E; ++I) {
125 Result = PrivatePrefix + Result;
127 Result = '"' + Result + '"';
131 std::string Mangler::getValueName(const GlobalValue *GV, const char *Suffix) {
132 assert((!isa<Function>(GV) || !cast<Function>(GV)->isIntrinsic()) &&
133 "Intrinsic functions cannot be mangled by Mangler");
136 if (GV->hasPrivateLinkage())
137 return makeNameProper(GV->getName() + Suffix, Prefix, PrivatePrefix);
138 return makeNameProper(GV->getName() + Suffix, Prefix);
141 // Get the ID for the global, assigning a new one if we haven't got one
143 unsigned &ID = AnonGlobalIDs[GV];
144 if (ID == 0) ID = NextAnonGlobalID++;
146 // Must mangle the global into a unique ID.
147 return "__unnamed_" + utostr(ID) + Suffix;
150 Mangler::Mangler(Module &M, const char *prefix, const char *privatePrefix)
151 : Prefix(prefix), PrivatePrefix (privatePrefix), UseQuotes(false),
152 PreserveAsmNames(false), NextAnonGlobalID(1) {
153 std::fill(AcceptableChars, array_endof(AcceptableChars), 0);
155 // Letters and numbers are acceptable.
156 for (unsigned char X = 'a'; X <= 'z'; ++X)
157 markCharAcceptable(X);
158 for (unsigned char X = 'A'; X <= 'Z'; ++X)
159 markCharAcceptable(X);
160 for (unsigned char X = '0'; X <= '9'; ++X)
161 markCharAcceptable(X);
163 // These chars are acceptable.
164 markCharAcceptable('_');
165 markCharAcceptable('$');
166 markCharAcceptable('.');