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Visit the landingpad instruction.

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This generates the correct SDNodes for the landingpad instruction. It makes an
assumption that the result of the landingpad instruction has at least two
values. And that the first value is a pointer to the exception object and the
second value is the "selector."


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@136430 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Bill Wendling 2011-07-28 23:44:58 +00:00
parent e963a3814f
commit 3678537332
1 changed files with 35 additions and 1 deletions
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36
lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp
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@ -1812,10 +1812,44 @@ void SelectionDAGBuilder::visitResume(const ResumeInst &RI) {
llvm_unreachable("SelectionDAGBuilder shouldn't visit resume instructions!");
}
void SelectionDAGBuilder::visitLandingPad(const LandingPadInst &) {
void SelectionDAGBuilder::visitLandingPad(const LandingPadInst &LP) {
// FIXME: Handle this
assert(FuncInfo.MBB->isLandingPad() &&
"Call to landingpad not in landing pad!");
MachineBasicBlock *MBB = FuncInfo.MBB;
MachineModuleInfo &MMI = DAG.getMachineFunction().getMMI();
AddLandingPadInfo(LP, MMI, MBB);
SmallVector<EVT, 2> ValueVTs;
ComputeValueVTs(TLI, LP.getType(),ValueVTs);
// Insert the EXCEPTIONADDR instruction.
assert(FuncInfo.MBB->isLandingPad() &&
"Call to eh.exception not in landing pad!");
SDVTList VTs = DAG.getVTList(TLI.getPointerTy(), MVT::Other);
SDValue Ops[2];
Ops[0] = DAG.getRoot();
SDValue Op1 = DAG.getNode(ISD::EXCEPTIONADDR, getCurDebugLoc(), VTs, Ops, 1);
SDValue Chain = Op1.getValue(1);
// Insert the EHSELECTION instruction.
VTs = DAG.getVTList(ValueVTs[1], MVT::Other);
Ops[0] = Op1;
Ops[1] = Chain;
SDValue Op2 = DAG.getNode(ISD::EHSELECTION, getCurDebugLoc(), VTs, Ops, 2);
Chain = Op2.getValue(1);
Ops[0] = Op1;
Ops[1] = Op2;
SDValue Res = DAG.getNode(ISD::MERGE_VALUES, getCurDebugLoc(),
DAG.getVTList(&ValueVTs[0], ValueVTs.size()),
&Ops[0], 2);
std::pair<SDValue, SDValue> RetPair = std::make_pair(Res, Chain);
setValue(&LP, RetPair.first);
DAG.setRoot(RetPair.second);
}
/// handleSmallSwitchCaseRange - Emit a series of specific tests (suitable for