#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, char Prefix) {
SmallString<256> TmpData;
StringRef Name = GVName.toStringRef(TmpData);
assert(!Name.empty() && "getNameWithPrefix requires non-empty name");
if (Name[0] == '\1') {
OS << Name.substr(1);
return;
}
if (PrefixTy == Mangler::Private)
OS << DL.getPrivateGlobalPrefix();
else if (PrefixTy == Mangler::LinkerPrivate)
OS << DL.getLinkerPrivateGlobalPrefix();
if (Prefix != '\0')
OS << Prefix;
OS << Name;
}
void Mangler::getNameWithPrefix(raw_ostream &OS, const Twine &GVName,
ManglerPrefixTy PrefixTy) const {
char Prefix = DL->getGlobalPrefix();
return getNameWithPrefixx(OS, GVName, PrefixTy, *DL, Prefix);
}
void Mangler::getNameWithPrefix(SmallVectorImpl<char> &OutName,
const Twine &GVName,
ManglerPrefixTy PrefixTy) const {
raw_svector_ostream OS(OutName);
return getNameWithPrefix(OS, GVName, PrefixTy);
}
static bool hasByteCountSuffix(CallingConv::ID CC) {
switch (CC) {
case CallingConv::X86_FastCall:
case CallingConv::X86_StdCall:
case CallingConv::X86_VectorCall:
return true;
default:
return false;
}
}
static void addByteCountSuffix(raw_ostream &OS, const Function *F,
const DataLayout &DL) {
unsigned ArgWords = 0;
for (Function::const_arg_iterator AI = F->arg_begin(), AE = F->arg_end();
AI != AE; ++AI) {
Type *Ty = AI->getType();
if (AI->hasByValOrInAllocaAttr())
Ty = cast<PointerType>(Ty)->getElementType();
unsigned PtrSize = DL.getPointerSize();
ArgWords += RoundUpToAlignment(DL.getTypeAllocSize(Ty), PtrSize);
}
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()) {
unsigned &ID = AnonGlobalIDs[GV];
if (ID == 0)
ID = NextAnonGlobalID++;
getNameWithPrefix(OS, "__unnamed_" + Twine(ID), PrefixTy);
return;
}
StringRef Name = GV->getName();
char Prefix = DL->getGlobalPrefix();
const Function *MSFunc = dyn_cast<Function>(GV);
if (Name.startswith("\01"))
MSFunc = nullptr; CallingConv::ID CC =
MSFunc ? MSFunc->getCallingConv() : (unsigned)CallingConv::C;
if (!DL->hasMicrosoftFastStdCallMangling() &&
CC != CallingConv::X86_VectorCall)
MSFunc = nullptr;
if (MSFunc) {
if (CC == CallingConv::X86_FastCall)
Prefix = '@'; else if (CC == CallingConv::X86_VectorCall)
Prefix = '\0'; }
getNameWithPrefixx(OS, Name, PrefixTy, *DL, Prefix);
if (!MSFunc)
return;
if (CC == CallingConv::X86_VectorCall)
OS << '@'; FunctionType *FT = MSFunc->getFunctionType();
if (hasByteCountSuffix(CC) &&
(!FT->isVarArg() || FT->getNumParams() == 0 ||
(FT->getNumParams() == 1 && MSFunc->hasStructRetAttr())))
addByteCountSuffix(OS, MSFunc, *DL);
}
void Mangler::getNameWithPrefix(SmallVectorImpl<char> &OutName,
const GlobalValue *GV,
bool CannotUsePrivateLabel) const {
raw_svector_ostream OS(OutName);
getNameWithPrefix(OS, GV, CannotUsePrivateLabel);
}