//===-- 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 assembly backends. // //===----------------------------------------------------------------------===// #include "llvm/IR/Mangler.h" #include "llvm/ADT/SmallString.h" #include "llvm/ADT/Twine.h" #include "llvm/IR/DataLayout.h" #include "llvm/IR/DerivedTypes.h" #include "llvm/IR/Function.h" #include "llvm/Support/raw_ostream.h" using namespace llvm; static void getNameWithPrefixx(raw_ostream &OS, const Twine &GVName, Mangler::ManglerPrefixTy PrefixTy, const DataLayout &DL, bool UseAt) { SmallString<256> TmpData; StringRef Name = GVName.toStringRef(TmpData); assert(!Name.empty() && "getNameWithPrefix requires non-empty name"); if (PrefixTy == Mangler::Private) OS << DL.getPrivateGlobalPrefix(); else if (PrefixTy == Mangler::LinkerPrivate) OS << DL.getLinkerPrivateGlobalPrefix(); if (UseAt) { OS << '@'; } else { char Prefix = DL.getGlobalPrefix(); if (Prefix != '\0') OS << Prefix; } // If this is a simple string that doesn't need escaping, just append it. OS << Name; } void Mangler::getNameWithPrefix(raw_ostream &OS, const Twine &GVName, ManglerPrefixTy PrefixTy) const { return getNameWithPrefixx(OS, GVName, PrefixTy, *DL, false); } void Mangler::getNameWithPrefix(SmallVectorImpl<char> &OutName, const Twine &GVName, ManglerPrefixTy PrefixTy) const { raw_svector_ostream OS(OutName); return getNameWithPrefix(OS, GVName, PrefixTy); } /// AddFastCallStdCallSuffix - Microsoft fastcall and stdcall functions require /// a suffix on their name indicating the number of words of arguments they /// take. static void AddFastCallStdCallSuffix(raw_ostream &OS, const Function *F, const DataLayout &TD) { // Calculate arguments size total. unsigned ArgWords = 0; for (Function::const_arg_iterator AI = F->arg_begin(), AE = F->arg_end(); AI != AE; ++AI) { Type *Ty = AI->getType(); // 'Dereference' type in case of byval or inalloca parameter attribute. if (AI->hasByValOrInAllocaAttr()) Ty = cast<PointerType>(Ty)->getElementType(); // Size should be aligned to DWORD boundary ArgWords += ((TD.getTypeAllocSize(Ty) + 3)/4)*4; } OS << '@' << ArgWords; } void Mangler::getNameWithPrefix(raw_ostream &OS, const GlobalValue *GV, bool CannotUsePrivateLabel) const { ManglerPrefixTy PrefixTy = Mangler::Default; if (GV->hasPrivateLinkage()) { if (CannotUsePrivateLabel) PrefixTy = Mangler::LinkerPrivate; else PrefixTy = Mangler::Private; } if (!GV->hasName()) { // 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. getNameWithPrefix(OS, "__unnamed_" + Twine(ID), PrefixTy); return; } StringRef Name = GV->getName(); // No need to do anything special if the global has the special "do not // mangle" flag in the name. if (Name[0] == '\1') { OS << Name.substr(1); return; } bool UseAt = false; const Function *MSFunc = NULL; CallingConv::ID CC; if (DL->hasMicrosoftFastStdCallMangling()) { if ((MSFunc = dyn_cast<Function>(GV))) { CC = MSFunc->getCallingConv(); // fastcall functions need to start with @ instead of _. if (CC == CallingConv::X86_FastCall) UseAt = true; } } getNameWithPrefixx(OS, Name, PrefixTy, *DL, UseAt); if (!MSFunc) return; // If we are supposed to add a microsoft-style suffix for stdcall/fastcall, // add it. // fastcall and stdcall functions usually need @42 at the end to specify // the argument info. FunctionType *FT = MSFunc->getFunctionType(); if ((CC == CallingConv::X86_FastCall || CC == CallingConv::X86_StdCall) && // "Pure" variadic functions do not receive @0 suffix. (!FT->isVarArg() || FT->getNumParams() == 0 || (FT->getNumParams() == 1 && MSFunc->hasStructRetAttr()))) AddFastCallStdCallSuffix(OS, MSFunc, *DL); } void Mangler::getNameWithPrefix(SmallVectorImpl<char> &OutName, const GlobalValue *GV, bool CannotUsePrivateLabel) const { raw_svector_ostream OS(OutName); getNameWithPrefix(OS, GV, CannotUsePrivateLabel); }