- LandingPadInst *LPI = II->getUnwindDest()->getLandingPadInst();
- // FIXME: Why does this assertion fail?
- //assert(FuncInfo.LandingPadStateMap.count(LPI) && "LP has no state!");
- int State = FuncInfo.LandingPadStateMap[LPI];
- insertStateNumberStore(ParentRegNode, II, State);
- }
- }
- }
-}
-
-/// Assign every distinct landingpad a unique state number for SEH. Unlike C++
-/// EH, we can use this very simple algorithm while C++ EH cannot because catch
-/// handlers aren't outlined and the runtime doesn't have to figure out which
-/// catch handler frame to unwind to.
-/// FIXME: __finally blocks are outlined, so this approach may break down there.
-void WinEHStatePass::addSEHStateStores(Function &F, MachineModuleInfo &MMI) {
- WinEHFuncInfo &FuncInfo = MMI.getWinEHFuncInfo(&F);
-
- // Remember and return the index that we used. We save it in WinEHFuncInfo so
- // that we can lower llvm.x86.seh.exceptioninfo later in filter functions
- // without too much trouble.
- int RegNodeEscapeIndex = escapeRegNode(F);
- FuncInfo.EHRegNodeEscapeIndex = RegNodeEscapeIndex;
-
- // Iterate all the instructions and emit state number stores.
- int CurState = 0;
- SmallPtrSet<BasicBlock *, 4> ExceptBlocks;
- for (BasicBlock &BB : F) {
- for (auto I = BB.begin(), E = BB.end(); I != E; ++I) {
- if (auto *CI = dyn_cast<CallInst>(I)) {
- auto *Intrin = dyn_cast<IntrinsicInst>(CI);
- if (Intrin) {
- // Calls that "don't throw" are considered to be able to throw asynch
- // exceptions, but intrinsics cannot.
- continue;
- }
- insertStateNumberStore(RegNode, CI, -1);
- } else if (auto *II = dyn_cast<InvokeInst>(I)) {
- // Look up the state number of the landingpad this unwinds to.
- LandingPadInst *LPI = II->getUnwindDest()->getLandingPadInst();
- auto InsertionPair =
- FuncInfo.LandingPadStateMap.insert(std::make_pair(LPI, CurState));
- auto Iter = InsertionPair.first;
- int &State = Iter->second;
- bool Inserted = InsertionPair.second;
- if (Inserted) {
- // Each action consumes a state number.
- auto *EHActions = cast<IntrinsicInst>(LPI->getNextNode());
- SmallVector<std::unique_ptr<ActionHandler>, 4> ActionList;
- parseEHActions(EHActions, ActionList);
- assert(!ActionList.empty());
- CurState += ActionList.size();
- State += ActionList.size() - 1;
-
- // Remember all the __except block targets.
- for (auto &Handler : ActionList) {
- if (auto *CH = dyn_cast<CatchHandler>(Handler.get())) {
- auto *BA = cast<BlockAddress>(CH->getHandlerBlockOrFunc());
- ExceptBlocks.insert(BA->getBasicBlock());
- }
- }
- }