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Revert r240762 "[X86] Cleanup X86WindowsTargetObjectFile::getSectionForConstant"

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It seems to have caused PR23966: "UNREACHABLE executed at ..\lib\Target\X86\X86TargetObjectFile.cpp:148"

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@240793 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Hans Wennborg 2015-06-26 16:48:02 +00:00
parent 438a4919fd
commit 57ec696dfd
1 changed files with 37 additions and 25 deletions
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62
lib/Target/X86/X86TargetObjectFile.cpp
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@ -131,40 +131,52 @@ static std::string APIntToHexString(const APInt &AI) {
return HexString;
}
static std::string scalarConstantToHexString(const Constant *C) {
Type *Ty = C->getType();
APInt AI;
if (isa<UndefValue>(C)) {
return APIntToHexString(APInt::getNullValue(Ty->getPrimitiveSizeInBits()));
} else if (const auto *CFP = dyn_cast<ConstantFP>(C)) {
return APIntToHexString(CFP->getValueAPF().bitcastToAPInt());
} else if (const auto *CI = dyn_cast<ConstantInt>(C)) {
return APIntToHexString(CI->getValue());
} else if (const auto *VTy = dyn_cast<VectorType>(Ty)) {
std::string HexString;
for (int I = VTy->getNumElements() - 1, E = -1; I != E; --I)
HexString += scalarConstantToHexString(C->getAggregateElement(I));
return HexString;
AI = APInt(Ty->getPrimitiveSizeInBits(), /*val=*/0);
} else if (Ty->isFloatTy() || Ty->isDoubleTy()) {
const auto *CFP = cast<ConstantFP>(C);
AI = CFP->getValueAPF().bitcastToAPInt();
} else if (Ty->isIntegerTy()) {
const auto *CI = cast<ConstantInt>(C);
AI = CI->getValue();
} else {
llvm_unreachable("unexpected constant pool element type!");
}
llvm_unreachable("unexpected constant pool element type!");
return APIntToHexString(AI);
}
MCSection *
X86WindowsTargetObjectFile::getSectionForConstant(SectionKind Kind,
const Constant *C) const {
if (Kind.isMergeableConst() && C) {
const unsigned Characteristics = COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
COFF::IMAGE_SCN_MEM_READ |
COFF::IMAGE_SCN_LNK_COMDAT;
std::string COMDATSymName;
if (Kind.isMergeableConst4() || Kind.isMergeableConst8())
COMDATSymName = "__real@" + scalarConstantToHexString(C);
else if (Kind.isMergeableConst16())
COMDATSymName = "__xmm@" + scalarConstantToHexString(C);
if (!COMDATSymName.empty())
return getContext().getCOFFSection(".rdata", Characteristics, Kind,
COMDATSymName,
COFF::IMAGE_COMDAT_SELECT_ANY);
if (Kind.isReadOnly()) {
if (C) {
Type *Ty = C->getType();
SmallString<32> COMDATSymName;
if (Ty->isFloatTy() || Ty->isDoubleTy()) {
COMDATSymName = "__real@";
COMDATSymName += scalarConstantToHexString(C);
} else if (const auto *VTy = dyn_cast<VectorType>(Ty)) {
uint64_t NumBits = VTy->getBitWidth();
if (NumBits == 128 || NumBits == 256) {
COMDATSymName = NumBits == 128 ? "__xmm@" : "__ymm@";
for (int I = VTy->getNumElements() - 1, E = -1; I != E; --I)
COMDATSymName +=
scalarConstantToHexString(C->getAggregateElement(I));
}
}
if (!COMDATSymName.empty()) {
unsigned Characteristics = COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
COFF::IMAGE_SCN_MEM_READ |
COFF::IMAGE_SCN_LNK_COMDAT;
return getContext().getCOFFSection(".rdata", Characteristics, Kind,
COMDATSymName,
COFF::IMAGE_COMDAT_SELECT_ANY);
}
}
}
return TargetLoweringObjectFile::getSectionForConstant(Kind, C);