void SelectionDAGBuilder::LowerCallTo(ImmutableCallSite CS, SDValue Callee,
bool isTailCall,
MachineBasicBlock *LandingPad) {
+ const TargetLowering *TLI = TM.getTargetLowering();
PointerType *PT = cast<PointerType>(CS.getCalledValue()->getType());
FunctionType *FTy = cast<FunctionType>(PT->getElementType());
Type *RetTy = FTy->getReturnType();
TargetLowering::ArgListEntry Entry;
Args.reserve(CS.arg_size());
- // Check whether the function can return without sret-demotion.
- SmallVector<ISD::OutputArg, 4> Outs;
- const TargetLowering *TLI = TM.getTargetLowering();
- GetReturnInfo(RetTy, CS.getAttributes(), Outs, *TLI);
-
- bool CanLowerReturn = TLI->CanLowerReturn(CS.getCallingConv(),
- DAG.getMachineFunction(),
- FTy->isVarArg(), Outs,
- FTy->getContext());
-
- SDValue DemoteStackSlot;
- int DemoteStackIdx = -100;
-
- if (!CanLowerReturn) {
- assert(!CS.hasInAllocaArgument() &&
- "sret demotion is incompatible with inalloca");
- uint64_t TySize = TLI->getDataLayout()->getTypeAllocSize(
- FTy->getReturnType());
- unsigned Align = TLI->getDataLayout()->getPrefTypeAlignment(
- FTy->getReturnType());
- MachineFunction &MF = DAG.getMachineFunction();
- DemoteStackIdx = MF.getFrameInfo()->CreateStackObject(TySize, Align, false);
- Type *StackSlotPtrType = PointerType::getUnqual(FTy->getReturnType());
-
- DemoteStackSlot = DAG.getFrameIndex(DemoteStackIdx, TLI->getPointerTy());
- Entry.Node = DemoteStackSlot;
- Entry.Ty = StackSlotPtrType;
- Entry.isSExt = false;
- Entry.isZExt = false;
- Entry.isInReg = false;
- Entry.isSRet = true;
- Entry.isNest = false;
- Entry.isByVal = false;
- Entry.isReturned = false;
- Entry.Alignment = Align;
- Args.push_back(Entry);
- RetTy = Type::getVoidTy(FTy->getContext());
- }
-
for (ImmutableCallSite::arg_iterator i = CS.arg_begin(), e = CS.arg_end();
i != e; ++i) {
const Value *V = *i;
"Non-null chain expected with non-tail call!");
assert((Result.second.getNode() || !Result.first.getNode()) &&
"Null value expected with tail call!");
- if (Result.first.getNode()) {
+ if (Result.first.getNode())
setValue(CS.getInstruction(), Result.first);
- } else if (!CanLowerReturn && Result.second.getNode()) {
- // The instruction result is the result of loading from the
- // hidden sret parameter.
- SmallVector<EVT, 1> PVTs;
- Type *PtrRetTy = PointerType::getUnqual(FTy->getReturnType());
-
- ComputeValueVTs(*TLI, PtrRetTy, PVTs);
- assert(PVTs.size() == 1 && "Pointers should fit in one register");
- EVT PtrVT = PVTs[0];
-
- SmallVector<EVT, 4> RetTys;
- SmallVector<uint64_t, 4> Offsets;
- RetTy = FTy->getReturnType();
- ComputeValueVTs(*TLI, RetTy, RetTys, &Offsets);
-
- unsigned NumValues = RetTys.size();
- SmallVector<SDValue, 4> Values(NumValues);
- SmallVector<SDValue, 4> Chains(NumValues);
-
- for (unsigned i = 0; i < NumValues; ++i) {
- SDValue Add = DAG.getNode(ISD::ADD, getCurSDLoc(), PtrVT,
- DemoteStackSlot,
- DAG.getConstant(Offsets[i], PtrVT));
- SDValue L = DAG.getLoad(RetTys[i], getCurSDLoc(), Result.second, Add,
- MachinePointerInfo::getFixedStack(DemoteStackIdx, Offsets[i]),
- false, false, false, 1);
- Values[i] = L;
- Chains[i] = L.getValue(1);
- }
-
- SDValue Chain = DAG.getNode(ISD::TokenFactor, getCurSDLoc(),
- MVT::Other, Chains);
- PendingLoads.push_back(Chain);
-
- setValue(CS.getInstruction(),
- DAG.getNode(ISD::MERGE_VALUES, getCurSDLoc(),
- DAG.getVTList(RetTys), Values));
- }
if (!Result.second.getNode()) {
// As a special case, a null chain means that a tail call has been emitted
FuncInfo.MF->getFrameInfo()->setHasPatchPoint();
}
+/// Returns an AttributeSet representing the attributes applied to the return
+/// value of the given call.
+static AttributeSet getReturnAttrs(TargetLowering::CallLoweringInfo &CLI) {
+ SmallVector<Attribute::AttrKind, 2> Attrs;
+ if (CLI.RetSExt)
+ Attrs.push_back(Attribute::SExt);
+ if (CLI.RetZExt)
+ Attrs.push_back(Attribute::ZExt);
+ if (CLI.IsInReg)
+ Attrs.push_back(Attribute::InReg);
+
+ return AttributeSet::get(CLI.RetTy->getContext(), AttributeSet::ReturnIndex,
+ Attrs);
+}
+
/// TargetLowering::LowerCallTo - This is the default LowerCallTo
/// implementation, which just calls LowerCall.
/// FIXME: When all targets are
TargetLowering::LowerCallTo(TargetLowering::CallLoweringInfo &CLI) const {
// Handle the incoming return values from the call.
CLI.Ins.clear();
+ Type *OrigRetTy = CLI.RetTy;
SmallVector<EVT, 4> RetTys;
- ComputeValueVTs(*this, CLI.RetTy, RetTys);
- for (unsigned I = 0, E = RetTys.size(); I != E; ++I) {
- EVT VT = RetTys[I];
- MVT RegisterVT = getRegisterType(CLI.RetTy->getContext(), VT);
- unsigned NumRegs = getNumRegisters(CLI.RetTy->getContext(), VT);
- for (unsigned i = 0; i != NumRegs; ++i) {
- ISD::InputArg MyFlags;
- MyFlags.VT = RegisterVT;
- MyFlags.ArgVT = VT;
- MyFlags.Used = CLI.IsReturnValueUsed;
- if (CLI.RetSExt)
- MyFlags.Flags.setSExt();
- if (CLI.RetZExt)
- MyFlags.Flags.setZExt();
- if (CLI.IsInReg)
- MyFlags.Flags.setInReg();
- CLI.Ins.push_back(MyFlags);
+ SmallVector<uint64_t, 4> Offsets;
+ ComputeValueVTs(*this, CLI.RetTy, RetTys, &Offsets);
+
+ SmallVector<ISD::OutputArg, 4> Outs;
+ GetReturnInfo(CLI.RetTy, getReturnAttrs(CLI), Outs, *this);
+
+ bool CanLowerReturn =
+ this->CanLowerReturn(CLI.CallConv, CLI.DAG.getMachineFunction(),
+ CLI.IsVarArg, Outs, CLI.RetTy->getContext());
+
+ SDValue DemoteStackSlot;
+ int DemoteStackIdx = -100;
+ if (!CanLowerReturn) {
+ // FIXME: equivalent assert?
+ // assert(!CS.hasInAllocaArgument() &&
+ // "sret demotion is incompatible with inalloca");
+ uint64_t TySize = getDataLayout()->getTypeAllocSize(CLI.RetTy);
+ unsigned Align = getDataLayout()->getPrefTypeAlignment(CLI.RetTy);
+ MachineFunction &MF = CLI.DAG.getMachineFunction();
+ DemoteStackIdx = MF.getFrameInfo()->CreateStackObject(TySize, Align, false);
+ Type *StackSlotPtrType = PointerType::getUnqual(CLI.RetTy);
+
+ DemoteStackSlot = CLI.DAG.getFrameIndex(DemoteStackIdx, getPointerTy());
+ ArgListEntry Entry;
+ Entry.Node = DemoteStackSlot;
+ Entry.Ty = StackSlotPtrType;
+ Entry.isSExt = false;
+ Entry.isZExt = false;
+ Entry.isInReg = false;
+ Entry.isSRet = true;
+ Entry.isNest = false;
+ Entry.isByVal = false;
+ Entry.isReturned = false;
+ Entry.Alignment = Align;
+ CLI.getArgs().insert(CLI.getArgs().begin(), Entry);
+ CLI.RetTy = Type::getVoidTy(CLI.RetTy->getContext());
+ } else {
+ for (unsigned I = 0, E = RetTys.size(); I != E; ++I) {
+ EVT VT = RetTys[I];
+ MVT RegisterVT = getRegisterType(CLI.RetTy->getContext(), VT);
+ unsigned NumRegs = getNumRegisters(CLI.RetTy->getContext(), VT);
+ for (unsigned i = 0; i != NumRegs; ++i) {
+ ISD::InputArg MyFlags;
+ MyFlags.VT = RegisterVT;
+ MyFlags.ArgVT = VT;
+ MyFlags.Used = CLI.IsReturnValueUsed;
+ if (CLI.RetSExt)
+ MyFlags.Flags.setSExt();
+ if (CLI.RetZExt)
+ MyFlags.Flags.setZExt();
+ if (CLI.IsInReg)
+ MyFlags.Flags.setInReg();
+ CLI.Ins.push_back(MyFlags);
+ }
}
}
"LowerCall emitted a value with the wrong type!");
});
- // Collect the legal value parts into potentially illegal values
- // that correspond to the original function's return values.
- ISD::NodeType AssertOp = ISD::DELETED_NODE;
- if (CLI.RetSExt)
- AssertOp = ISD::AssertSext;
- else if (CLI.RetZExt)
- AssertOp = ISD::AssertZext;
SmallVector<SDValue, 4> ReturnValues;
- unsigned CurReg = 0;
- for (unsigned I = 0, E = RetTys.size(); I != E; ++I) {
- EVT VT = RetTys[I];
- MVT RegisterVT = getRegisterType(CLI.RetTy->getContext(), VT);
- unsigned NumRegs = getNumRegisters(CLI.RetTy->getContext(), VT);
-
- ReturnValues.push_back(getCopyFromParts(CLI.DAG, CLI.DL, &InVals[CurReg],
- NumRegs, RegisterVT, VT, nullptr,
- AssertOp));
- CurReg += NumRegs;
- }
-
- // For a function returning void, there is no return value. We can't create
- // such a node, so we just return a null return value in that case. In
- // that case, nothing will actually look at the value.
- if (ReturnValues.empty())
- return std::make_pair(SDValue(), CLI.Chain);
+ if (!CanLowerReturn) {
+ // The instruction result is the result of loading from the
+ // hidden sret parameter.
+ SmallVector<EVT, 1> PVTs;
+ Type *PtrRetTy = PointerType::getUnqual(OrigRetTy);
+
+ ComputeValueVTs(*this, PtrRetTy, PVTs);
+ assert(PVTs.size() == 1 && "Pointers should fit in one register");
+ EVT PtrVT = PVTs[0];
+
+ unsigned NumValues = RetTys.size();
+ ReturnValues.resize(NumValues);
+ SmallVector<SDValue, 4> Chains(NumValues);
+
+ for (unsigned i = 0; i < NumValues; ++i) {
+ SDValue Add = CLI.DAG.getNode(ISD::ADD, CLI.DL, PtrVT, DemoteStackSlot,
+ CLI.DAG.getConstant(Offsets[i], PtrVT));
+ SDValue L = CLI.DAG.getLoad(
+ RetTys[i], CLI.DL, CLI.Chain, Add,
+ MachinePointerInfo::getFixedStack(DemoteStackIdx, Offsets[i]), false,
+ false, false, 1);
+ ReturnValues[i] = L;
+ Chains[i] = L.getValue(1);
+ }
+
+ CLI.Chain = CLI.DAG.getNode(ISD::TokenFactor, CLI.DL, MVT::Other, Chains);
+ } else {
+ // Collect the legal value parts into potentially illegal values
+ // that correspond to the original function's return values.
+ ISD::NodeType AssertOp = ISD::DELETED_NODE;
+ if (CLI.RetSExt)
+ AssertOp = ISD::AssertSext;
+ else if (CLI.RetZExt)
+ AssertOp = ISD::AssertZext;
+ unsigned CurReg = 0;
+ for (unsigned I = 0, E = RetTys.size(); I != E; ++I) {
+ EVT VT = RetTys[I];
+ MVT RegisterVT = getRegisterType(CLI.RetTy->getContext(), VT);
+ unsigned NumRegs = getNumRegisters(CLI.RetTy->getContext(), VT);
+
+ ReturnValues.push_back(getCopyFromParts(CLI.DAG, CLI.DL, &InVals[CurReg],
+ NumRegs, RegisterVT, VT, nullptr,
+ AssertOp));
+ CurReg += NumRegs;
+ }
+
+ // For a function returning void, there is no return value. We can't create
+ // such a node, so we just return a null return value in that case. In
+ // that case, nothing will actually look at the value.
+ if (ReturnValues.empty())
+ return std::make_pair(SDValue(), CLI.Chain);
+ }
SDValue Res = CLI.DAG.getNode(ISD::MERGE_VALUES, CLI.DL,
CLI.DAG.getVTList(RetTys), ReturnValues);
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