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"
19 static char HexDigit(int V) {
20 return V < 10 ? V+'0' : V+'A'-10;
23 static std::string MangleLetter(unsigned char C) {
24 return std::string("_")+HexDigit(C >> 4) + HexDigit(C & 15) + "_";
27 /// makeNameProper - We don't want identifier names non-C-identifier characters
28 /// in them, so mangle them as appropriate.
30 std::string Mangler::makeNameProper(const std::string &X) {
33 // Mangle the first letter specially, don't allow numbers...
34 if ((X[0] < 'a' || X[0] > 'z') && (X[0] < 'A' || X[0] > 'Z') && X[0] != '_')
35 Result += MangleLetter(X[0]);
39 for (std::string::const_iterator I = X.begin()+1, E = X.end(); I != E; ++I)
40 if ((*I < 'a' || *I > 'z') && (*I < 'A' || *I > 'Z') &&
41 (*I < '0' || *I > '9') && *I != '_')
42 Result += MangleLetter(*I);
48 std::string Mangler::getValueName(const Value *V) {
49 // Check to see whether we've already named V.
50 ValueMap::iterator VI = Memo.find(V);
51 if (VI != Memo.end()) {
52 return VI->second; // Return the old name for V.
56 if (V->hasName()) { // Print out the label if it exists...
57 // Name mangling occurs as follows:
58 // - If V is not a global, mangling always occurs.
59 // - Otherwise, mangling occurs when any of the following are true:
60 // 1) V has internal linkage
61 // 2) V's name would collide if it is not mangled.
63 const GlobalValue* gv = dyn_cast<GlobalValue>(V);
64 if (gv && !gv->hasInternalLinkage() && !MangledGlobals.count(gv)) {
65 name = makeNameProper(gv->getName());
66 if (AddUnderscorePrefix) name = "_" + name;
68 // Non-global, or global with internal linkage / colliding name
70 name = "l" + utostr(V->getType()->getUniqueID()) + "_" +
71 makeNameProper(V->getName());
74 name = "ltmp_" + utostr(Count++) + "_"
75 + utostr(V->getType()->getUniqueID());
82 Mangler::Mangler(Module &m, bool addUnderscorePrefix)
83 : M(m), AddUnderscorePrefix(addUnderscorePrefix) {
84 // Calculate which global values have names that will collide when we throw
85 // away type information.
86 std::set<std::string> FoundNames;
87 for (Module::iterator I = M.begin(), E = M.end(); I != E; ++I)
88 if (I->hasName()) // If the global has a name...
89 if (FoundNames.count(I->getName())) // And the name is already used
90 MangledGlobals.insert(I); // Mangle the name
92 FoundNames.insert(I->getName()); // Otherwise, keep track of name
94 for (Module::giterator I = M.gbegin(), E = M.gend(); I != E; ++I)
95 if (I->hasName()) // If the global has a name...
96 if (FoundNames.count(I->getName())) // And the name is already used
97 MangledGlobals.insert(I); // Mangle the name
99 FoundNames.insert(I->getName()); // Otherwise, keep track of name