| //===-- Mangler.cpp - Self-contained c/asm llvm name mangler --------------===// |
| // |
| // The LLVM Compiler Infrastructure |
| // |
| // This file is distributed under the University of Illinois Open Source |
| // License. See LICENSE.TXT for details. |
| // |
| //===----------------------------------------------------------------------===// |
| // |
| // Unified name mangler for CWriter and assembly backends. |
| // |
| //===----------------------------------------------------------------------===// |
| |
| #include "llvm/Support/Mangler.h" |
| #include "llvm/Function.h" |
| #include "llvm/ADT/STLExtras.h" |
| #include "llvm/ADT/StringExtras.h" |
| #include "llvm/ADT/StringMap.h" |
| #include "llvm/ADT/SmallVector.h" |
| #include "llvm/Support/raw_ostream.h" |
| using namespace llvm; |
| |
| static char HexDigit(int V) { |
| return V < 10 ? V+'0' : V+'A'-10; |
| } |
| |
| static std::string MangleLetter(unsigned char C) { |
| char Result[] = { '_', HexDigit(C >> 4), HexDigit(C & 15), '_', 0 }; |
| return Result; |
| } |
| |
| /// makeNameProper - We don't want identifier names non-C-identifier characters |
| /// in them, so mangle them as appropriate. |
| /// |
| std::string Mangler::makeNameProper(const std::string &X, |
| ManglerPrefixTy PrefixTy) { |
| assert(!X.empty() && "Cannot mangle empty strings"); |
| |
| if (!UseQuotes) { |
| std::string Result; |
| |
| // If X does not start with (char)1, add the prefix. |
| bool NeedPrefix = true; |
| std::string::const_iterator I = X.begin(); |
| if (*I == 1) { |
| NeedPrefix = false; |
| ++I; // Skip over the marker. |
| } |
| |
| // Mangle the first letter specially, don't allow numbers unless the target |
| // explicitly allows them. |
| if (!SymbolsCanStartWithDigit && *I >= '0' && *I <= '9') |
| Result += MangleLetter(*I++); |
| |
| for (std::string::const_iterator E = X.end(); I != E; ++I) { |
| if (!isCharAcceptable(*I)) |
| Result += MangleLetter(*I); |
| else |
| Result += *I; |
| } |
| |
| if (NeedPrefix) { |
| Result = Prefix + Result; |
| |
| if (PrefixTy == Mangler::Private) |
| Result = PrivatePrefix + Result; |
| else if (PrefixTy == Mangler::LinkerPrivate) |
| Result = LinkerPrivatePrefix + Result; |
| } |
| |
| return Result; |
| } |
| |
| bool NeedPrefix = true; |
| bool NeedQuotes = false; |
| std::string Result; |
| std::string::const_iterator I = X.begin(); |
| if (*I == 1) { |
| NeedPrefix = false; |
| ++I; // Skip over the marker. |
| } |
| |
| // If the first character is a number, we need quotes. |
| if (*I >= '0' && *I <= '9') |
| NeedQuotes = true; |
| |
| // Do an initial scan of the string, checking to see if we need quotes or |
| // to escape a '"' or not. |
| if (!NeedQuotes) |
| for (std::string::const_iterator E = X.end(); I != E; ++I) |
| if (!isCharAcceptable(*I)) { |
| NeedQuotes = true; |
| break; |
| } |
| |
| // In the common case, we don't need quotes. Handle this quickly. |
| if (!NeedQuotes) { |
| if (!NeedPrefix) |
| return X.substr(1); // Strip off the \001. |
| |
| Result = Prefix + X; |
| |
| if (PrefixTy == Mangler::Private) |
| Result = PrivatePrefix + Result; |
| else if (PrefixTy == Mangler::LinkerPrivate) |
| Result = LinkerPrivatePrefix + Result; |
| |
| return Result; |
| } |
| |
| if (NeedPrefix) |
| Result = X.substr(0, I-X.begin()); |
| |
| // Otherwise, construct the string the expensive way. |
| for (std::string::const_iterator E = X.end(); I != E; ++I) { |
| if (*I == '"') |
| Result += "_QQ_"; |
| else if (*I == '\n') |
| Result += "_NL_"; |
| else |
| Result += *I; |
| } |
| |
| if (NeedPrefix) { |
| Result = Prefix + Result; |
| |
| if (PrefixTy == Mangler::Private) |
| Result = PrivatePrefix + Result; |
| else if (PrefixTy == Mangler::LinkerPrivate) |
| Result = LinkerPrivatePrefix + Result; |
| } |
| |
| Result = '"' + Result + '"'; |
| return Result; |
| } |
| |
| /// getMangledName - Returns the mangled name of V, an LLVM Value, |
| /// in the current module. If 'Suffix' is specified, the name ends with the |
| /// specified suffix. If 'ForcePrivate' is specified, the label is specified |
| /// to have a private label prefix. |
| /// |
| std::string Mangler::getMangledName(const GlobalValue *GV, const char *Suffix, |
| bool ForcePrivate) { |
| assert((!isa<Function>(GV) || !cast<Function>(GV)->isIntrinsic()) && |
| "Intrinsic functions cannot be mangled by Mangler"); |
| |
| ManglerPrefixTy PrefixTy = |
| (GV->hasPrivateLinkage() || ForcePrivate) ? Mangler::Private : |
| GV->hasLinkerPrivateLinkage() ? Mangler::LinkerPrivate : Mangler::Default; |
| |
| if (GV->hasName()) |
| return makeNameProper(GV->getNameStr() + Suffix, PrefixTy); |
| |
| // Get the ID for the global, assigning a new one if we haven't got one |
| // already. |
| unsigned &ID = AnonGlobalIDs[GV]; |
| if (ID == 0) ID = NextAnonGlobalID++; |
| |
| // Must mangle the global into a unique ID. |
| return makeNameProper("__unnamed_" + utostr(ID) + Suffix, PrefixTy); |
| } |
| |
| |
| /// getNameWithPrefix - Fill OutName with the name of the appropriate prefix |
| /// and the specified global variable's name. If the global variable doesn't |
| /// have a name, this fills in a unique name for the global. |
| void Mangler::getNameWithPrefix(SmallVectorImpl<char> &OutName, |
| const GlobalValue *GV, |
| bool isImplicitlyPrivate) { |
| |
| // If the global is anonymous or not led with \1, then add the appropriate |
| // prefix. |
| if (!GV->hasName() || GV->getName()[0] != '\1') { |
| if (GV->hasPrivateLinkage() || isImplicitlyPrivate) |
| OutName.append(PrivatePrefix, PrivatePrefix+strlen(PrivatePrefix)); |
| else if (GV->hasLinkerPrivateLinkage()) |
| OutName.append(LinkerPrivatePrefix, |
| LinkerPrivatePrefix+strlen(LinkerPrivatePrefix));; |
| OutName.append(Prefix, Prefix+strlen(Prefix)); |
| } |
| |
| // If the global has a name, just append it now. |
| if (GV->hasName()) { |
| StringRef Name = GV->getName(); |
| |
| // Strip off the prefix marker if present. |
| if (Name[0] != '\1') |
| OutName.append(Name.begin(), Name.end()); |
| else |
| OutName.append(Name.begin()+1, Name.end()); |
| return; |
| } |
| |
| // If the global variable doesn't have a name, return a unique name for the |
| // global based on a numbering. |
| |
| // Get the ID for the global, assigning a new one if we haven't got one |
| // already. |
| unsigned &ID = AnonGlobalIDs[GV]; |
| if (ID == 0) ID = NextAnonGlobalID++; |
| |
| // Must mangle the global into a unique ID. |
| raw_svector_ostream(OutName) << "__unnamed_" << ID; |
| } |
| |
| |
| Mangler::Mangler(Module &M, const char *prefix, const char *privatePrefix, |
| const char *linkerPrivatePrefix) |
| : Prefix(prefix), PrivatePrefix(privatePrefix), |
| LinkerPrivatePrefix(linkerPrivatePrefix), UseQuotes(false), |
| SymbolsCanStartWithDigit(false), NextAnonGlobalID(1) { |
| std::fill(AcceptableChars, array_endof(AcceptableChars), 0); |
| |
| // Letters and numbers are acceptable. |
| for (unsigned char X = 'a'; X <= 'z'; ++X) |
| markCharAcceptable(X); |
| for (unsigned char X = 'A'; X <= 'Z'; ++X) |
| markCharAcceptable(X); |
| for (unsigned char X = '0'; X <= '9'; ++X) |
| markCharAcceptable(X); |
| |
| // These chars are acceptable. |
| markCharAcceptable('_'); |
| markCharAcceptable('$'); |
| markCharAcceptable('.'); |
| markCharAcceptable('@'); |
| } |