1 //===-- Mangler.cpp - Self-contained c/asm llvm name mangler --------------===//
3 // The LLVM Compiler Infrastructure
5 // This file was developed by the LLVM research group and is distributed under
6 // the University of Illinois Open Source 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/Module.h"
16 #include "llvm/Type.h"
17 #include "Support/StringExtras.h"
21 static char HexDigit(int V) {
22 return V < 10 ? V+'0' : V+'A'-10;
25 static std::string MangleLetter(unsigned char C) {
26 return std::string("_")+HexDigit(C >> 4) + HexDigit(C & 15) + "_";
29 /// makeNameProper - We don't want identifier names non-C-identifier characters
30 /// in them, so mangle them as appropriate.
32 std::string Mangler::makeNameProper(const std::string &X) {
35 // Mangle the first letter specially, don't allow numbers...
36 if ((X[0] < 'a' || X[0] > 'z') && (X[0] < 'A' || X[0] > 'Z') && X[0] != '_')
37 Result += MangleLetter(X[0]);
41 for (std::string::const_iterator I = X.begin()+1, E = X.end(); I != E; ++I)
42 if ((*I < 'a' || *I > 'z') && (*I < 'A' || *I > 'Z') &&
43 (*I < '0' || *I > '9') && *I != '_')
44 Result += MangleLetter(*I);
50 std::string Mangler::getValueName(const Value *V) {
51 // Check to see whether we've already named V.
52 ValueMap::iterator VI = Memo.find(V);
53 if (VI != Memo.end()) {
54 return VI->second; // Return the old name for V.
58 if (V->hasName()) { // Print out the label if it exists...
59 // Name mangling occurs as follows:
60 // - If V is not a global, mangling always occurs.
61 // - Otherwise, mangling occurs when any of the following are true:
62 // 1) V has internal linkage
63 // 2) V's name would collide if it is not mangled.
65 const GlobalValue* gv = dyn_cast<GlobalValue>(V);
66 if (gv && !gv->hasInternalLinkage() && !MangledGlobals.count(gv)) {
67 name = makeNameProper(gv->getName());
68 if (AddUnderscorePrefix) name = "_" + name;
70 // Non-global, or global with internal linkage / colliding name
72 name = "l" + utostr(V->getType()->getUniqueID()) + "_" +
73 makeNameProper(V->getName());
76 name = "ltmp_" + utostr(Count++) + "_"
77 + utostr(V->getType()->getUniqueID());
84 Mangler::Mangler(Module &m, bool addUnderscorePrefix)
85 : M(m), AddUnderscorePrefix(addUnderscorePrefix) {
86 // Calculate which global values have names that will collide when we throw
87 // away type information.
88 std::set<std::string> FoundNames;
89 for (Module::iterator I = M.begin(), E = M.end(); I != E; ++I)
90 if (I->hasName()) // If the global has a name...
91 if (FoundNames.count(I->getName())) // And the name is already used
92 MangledGlobals.insert(I); // Mangle the name
94 FoundNames.insert(I->getName()); // Otherwise, keep track of name
96 for (Module::giterator I = M.gbegin(), E = M.gend(); I != E; ++I)
97 if (I->hasName()) // If the global has a name...
98 if (FoundNames.count(I->getName())) // And the name is already used
99 MangledGlobals.insert(I); // Mangle the name
101 FoundNames.insert(I->getName()); // Otherwise, keep track of name
104 } // End llvm namespace