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Additional fix for PR1422: make sure the landing pad label is placed in the 

correct machine basic block - do not rely on the eh.exception intrinsic
being in the landing pad: the loop optimizers can move it out.

llvm-svn: 37463
This commit is contained in:
Duncan Sands 2007-06-06 10:05:18 +00:00
parent fe940d8d74
commit 61166501a1
1 changed files with 26 additions and 15 deletions
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33
llvm/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp
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@ -1337,11 +1337,9 @@ void SelectionDAGLowering::visitInvoke(InvokeInst &I) {
void SelectionDAGLowering::visitInvoke(InvokeInst &I, bool AsTerminator) {
// Retrieve successors.
MachineBasicBlock *Return = FuncInfo.MBBMap[I.getSuccessor(0)];
MachineBasicBlock *LandingPad = FuncInfo.MBBMap[I.getSuccessor(1)];
if (!AsTerminator) {
// Mark landing pad so that it doesn't get deleted in branch folding.
LandingPad->setIsLandingPad();
MachineBasicBlock *LandingPad = FuncInfo.MBBMap[I.getSuccessor(1)];
LowerCallTo(I, I.getCalledValue()->getType(),
I.getCallingConv(),
@ -2577,12 +2575,6 @@ SelectionDAGLowering::visitIntrinsicCall(CallInst &I, unsigned Intrinsic) {
MachineModuleInfo *MMI = DAG.getMachineModuleInfo();
if (MMI) {
// Add a label to mark the beginning of the landing pad. Deletion of the
// landing pad can thus be detected via the MachineModuleInfo.
unsigned LabelID = MMI->addLandingPad(CurMBB);
DAG.setRoot(DAG.getNode(ISD::LABEL, MVT::Other, DAG.getEntryNode(),
DAG.getConstant(LabelID, MVT::i32)));
// Mark exception register as live in.
unsigned Reg = TLI.getExceptionAddressRegister();
if (Reg) CurMBB->addLiveIn(Reg);
@ -2788,7 +2780,7 @@ void SelectionDAGLowering::LowerCallTo(Instruction &I,
Args.push_back(Entry);
}
if (ExceptionHandling) {
if (ExceptionHandling && MMI) {
// Insert a label before the invoke call to mark the try range. This can be
// used to detect deletion of the invoke via the MachineModuleInfo.
BeginLabel = MMI->NextLabelID();
@ -2805,7 +2797,7 @@ void SelectionDAGLowering::LowerCallTo(Instruction &I,
setValue(&I, Result.first);
DAG.setRoot(Result.second);
if (ExceptionHandling) {
if (ExceptionHandling && MMI) {
// Insert a label at the end of the invoke call to mark the try range. This
// can be used to detect deletion of the invoke via the MachineModuleInfo.
EndLabel = MMI->NextLabelID();
@ -4386,6 +4378,13 @@ bool SelectionDAGISel::runOnFunction(Function &Fn) {
FunctionLoweringInfo FuncInfo(TLI, Fn, MF);
for (Function::iterator I = Fn.begin(), E = Fn.end(); I != E; ++I)
if (InvokeInst *Invoke = dyn_cast<InvokeInst>(I->getTerminator())) {
// Mark landing pad.
MachineBasicBlock *LandingPad = FuncInfo.MBBMap[Invoke->getSuccessor(1)];
LandingPad->setIsLandingPad();
}
for (Function::iterator I = Fn.begin(), E = Fn.end(); I != E; ++I)
SelectBasicBlock(I, MF, FuncInfo);
@ -4523,6 +4522,18 @@ void SelectionDAGISel::BuildSelectionDAG(SelectionDAG &DAG, BasicBlock *LLVMBB,
BB = FuncInfo.MBBMap[LLVMBB];
SDL.setCurrentBasicBlock(BB);
if (ExceptionHandling && BB->isLandingPad()) {
MachineModuleInfo *MMI = DAG.getMachineModuleInfo();
if (MMI) {
// Add a label to mark the beginning of the landing pad. Deletion of the
// landing pad can thus be detected via the MachineModuleInfo.
unsigned LabelID = MMI->addLandingPad(BB);
DAG.setRoot(DAG.getNode(ISD::LABEL, MVT::Other, DAG.getEntryNode(),
DAG.getConstant(LabelID, MVT::i32)));
}
}
// Lower all of the non-terminator instructions.
for (BasicBlock::iterator I = LLVMBB->begin(), E = --LLVMBB->end();
I != E; ++I)