| //===-- 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 = nullptr; |
| 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); |
| } |