class Constant;
class Function;
class GlobalVariable;
+class InvokeInst;
class IntrinsicInst;
class LandingPadInst;
class MCSymbol;
NumIPToStateFuncsVisited(0) {}
};
+/// Analyze the IR in ParentFn and it's handlers to build WinEHFuncInfo, which
+/// describes the state numbers and tables used by __CxxFrameHandler3. This
+/// analysis assumes that WinEHPrepare has already been run.
+void calculateWinCXXEHStateNumbers(const Function *ParentFn,
+ WinEHFuncInfo &FuncInfo);
+
}
#endif // LLVM_CODEGEN_WINEHFUNCINFO_H
return ExtendKind;
}
-namespace {
-struct WinEHNumbering {
- WinEHNumbering(WinEHFuncInfo &FuncInfo) : FuncInfo(FuncInfo),
- CurrentBaseState(-1), NextState(0) {}
-
- WinEHFuncInfo &FuncInfo;
- int CurrentBaseState;
- int NextState;
-
- SmallVector<std::unique_ptr<ActionHandler>, 4> HandlerStack;
- SmallPtrSet<const Function *, 4> VisitedHandlers;
-
- int currentEHNumber() const {
- return HandlerStack.empty() ? CurrentBaseState : HandlerStack.back()->getEHState();
- }
-
- void createUnwindMapEntry(int ToState, ActionHandler *AH);
- void createTryBlockMapEntry(int TryLow, int TryHigh,
- ArrayRef<CatchHandler *> Handlers);
- void processCallSite(MutableArrayRef<std::unique_ptr<ActionHandler>> Actions,
- ImmutableCallSite CS);
- void popUnmatchedActions(int FirstMismatch);
- void calculateStateNumbers(const Function &F);
- void findActionRootLPads(const Function &F);
-};
-}
-
void FunctionLoweringInfo::set(const Function &fn, MachineFunction &mf,
SelectionDAG *DAG) {
Fn = &fn;
if (!isMSVCEHPersonality(Personality))
return;
- WinEHFuncInfo *EHInfo = nullptr;
if (Personality == EHPersonality::MSVC_Win64SEH) {
addSEHHandlersForLPads(LPads);
} else if (Personality == EHPersonality::MSVC_CXX) {
const Function *WinEHParentFn = MMI.getWinEHParent(&fn);
- EHInfo = &MMI.getWinEHFuncInfo(WinEHParentFn);
- if (EHInfo->LandingPadStateMap.empty()) {
- WinEHNumbering Num(*EHInfo);
- Num.findActionRootLPads(*WinEHParentFn);
- // The VisitedHandlers list is used by both findActionRootLPads and
- // calculateStateNumbers, but both functions need to visit all handlers.
- Num.VisitedHandlers.clear();
- Num.calculateStateNumbers(*WinEHParentFn);
- // Pop everything on the handler stack.
- // It may be necessary to call this more than once because a handler can
- // be pushed on the stack as a result of clearing the stack.
- while (!Num.HandlerStack.empty())
- Num.processCallSite(None, ImmutableCallSite());
- }
+ WinEHFuncInfo &EHInfo = MMI.getWinEHFuncInfo(WinEHParentFn);
+ calculateWinCXXEHStateNumbers(WinEHParentFn, EHInfo);
// Copy the state numbers to LandingPadInfo for the current function, which
// could be a handler or the parent.
for (const LandingPadInst *LP : LPads) {
MachineBasicBlock *LPadMBB = MBBMap[LP->getParent()];
- MMI.addWinEHState(LPadMBB, EHInfo->LandingPadStateMap[LP]);
+ MMI.addWinEHState(LPadMBB, EHInfo.LandingPadStateMap[LP]);
}
}
}
}
}
-void WinEHNumbering::createUnwindMapEntry(int ToState, ActionHandler *AH) {
- WinEHUnwindMapEntry UME;
- UME.ToState = ToState;
- if (auto *CH = dyn_cast_or_null<CleanupHandler>(AH))
- UME.Cleanup = cast<Function>(CH->getHandlerBlockOrFunc());
- else
- UME.Cleanup = nullptr;
- FuncInfo.UnwindMap.push_back(UME);
-}
-
-void WinEHNumbering::createTryBlockMapEntry(int TryLow, int TryHigh,
- ArrayRef<CatchHandler *> Handlers) {
- // See if we already have an entry for this set of handlers.
- // This is using iterators rather than a range-based for loop because
- // if we find the entry we're looking for we'll need the iterator to erase it.
- int NumHandlers = Handlers.size();
- auto I = FuncInfo.TryBlockMap.begin();
- auto E = FuncInfo.TryBlockMap.end();
- for ( ; I != E; ++I) {
- auto &Entry = *I;
- if (Entry.HandlerArray.size() != (size_t)NumHandlers)
- continue;
- int N;
- for (N = 0; N < NumHandlers; ++N) {
- if (Entry.HandlerArray[N].Handler != Handlers[N]->getHandlerBlockOrFunc())
- break; // breaks out of inner loop
- }
- // If all the handlers match, this is what we were looking for.
- if (N == NumHandlers) {
- break;
- }
- }
-
- // If we found an existing entry for this set of handlers, extend the range
- // but move the entry to the end of the map vector. The order of entries
- // in the map is critical to the way that the runtime finds handlers.
- // FIXME: Depending on what has happened with block ordering, this may
- // incorrectly combine entries that should remain separate.
- if (I != E) {
- // Copy the existing entry.
- WinEHTryBlockMapEntry Entry = *I;
- Entry.TryLow = std::min(TryLow, Entry.TryLow);
- Entry.TryHigh = std::max(TryHigh, Entry.TryHigh);
- assert(Entry.TryLow <= Entry.TryHigh);
- // Erase the old entry and add this one to the back.
- FuncInfo.TryBlockMap.erase(I);
- FuncInfo.TryBlockMap.push_back(Entry);
- return;
- }
-
- // If we didn't find an entry, create a new one.
- WinEHTryBlockMapEntry TBME;
- TBME.TryLow = TryLow;
- TBME.TryHigh = TryHigh;
- assert(TBME.TryLow <= TBME.TryHigh);
- for (CatchHandler *CH : Handlers) {
- WinEHHandlerType HT;
- if (CH->getSelector()->isNullValue()) {
- HT.Adjectives = 0x40;
- HT.TypeDescriptor = nullptr;
- } else {
- auto *GV = cast<GlobalVariable>(CH->getSelector()->stripPointerCasts());
- // Selectors are always pointers to GlobalVariables with 'struct' type.
- // The struct has two fields, adjectives and a type descriptor.
- auto *CS = cast<ConstantStruct>(GV->getInitializer());
- HT.Adjectives =
- cast<ConstantInt>(CS->getAggregateElement(0U))->getZExtValue();
- HT.TypeDescriptor =
- cast<GlobalVariable>(CS->getAggregateElement(1)->stripPointerCasts());
- }
- HT.Handler = cast<Function>(CH->getHandlerBlockOrFunc());
- HT.CatchObjRecoverIdx = CH->getExceptionVarIndex();
- TBME.HandlerArray.push_back(HT);
- }
- FuncInfo.TryBlockMap.push_back(TBME);
-}
-
-static void print_name(const Value *V) {
-#ifndef NDEBUG
- if (!V) {
- DEBUG(dbgs() << "null");
- return;
- }
-
- if (const auto *F = dyn_cast<Function>(V))
- DEBUG(dbgs() << F->getName());
- else
- DEBUG(V->dump());
-#endif
-}
-
-void WinEHNumbering::processCallSite(
- MutableArrayRef<std::unique_ptr<ActionHandler>> Actions,
- ImmutableCallSite CS) {
- DEBUG(dbgs() << "processCallSite (EH state = " << currentEHNumber()
- << ") for: ");
- print_name(CS ? CS.getCalledValue() : nullptr);
- DEBUG(dbgs() << '\n');
-
- DEBUG(dbgs() << "HandlerStack: \n");
- for (int I = 0, E = HandlerStack.size(); I < E; ++I) {
- DEBUG(dbgs() << " ");
- print_name(HandlerStack[I]->getHandlerBlockOrFunc());
- DEBUG(dbgs() << '\n');
- }
- DEBUG(dbgs() << "Actions: \n");
- for (int I = 0, E = Actions.size(); I < E; ++I) {
- DEBUG(dbgs() << " ");
- print_name(Actions[I]->getHandlerBlockOrFunc());
- DEBUG(dbgs() << '\n');
- }
- int FirstMismatch = 0;
- for (int E = std::min(HandlerStack.size(), Actions.size()); FirstMismatch < E;
- ++FirstMismatch) {
- if (HandlerStack[FirstMismatch]->getHandlerBlockOrFunc() !=
- Actions[FirstMismatch]->getHandlerBlockOrFunc())
- break;
- }
-
- // Remove unmatched actions from the stack and process their EH states.
- popUnmatchedActions(FirstMismatch);
-
- DEBUG(dbgs() << "Pushing actions for CallSite: ");
- print_name(CS ? CS.getCalledValue() : nullptr);
- DEBUG(dbgs() << '\n');
-
- bool LastActionWasCatch = false;
- const LandingPadInst *LastRootLPad = nullptr;
- for (size_t I = FirstMismatch; I != Actions.size(); ++I) {
- // We can reuse eh states when pushing two catches for the same invoke.
- bool CurrActionIsCatch = isa<CatchHandler>(Actions[I].get());
- auto *Handler = cast<Function>(Actions[I]->getHandlerBlockOrFunc());
- // Various conditions can lead to a handler being popped from the
- // stack and re-pushed later. That shouldn't create a new state.
- // FIXME: Can code optimization lead to re-used handlers?
- if (FuncInfo.HandlerEnclosedState.count(Handler)) {
- // If we already assigned the state enclosed by this handler re-use it.
- Actions[I]->setEHState(FuncInfo.HandlerEnclosedState[Handler]);
- continue;
- }
- const LandingPadInst* RootLPad = FuncInfo.RootLPad[Handler];
- if (CurrActionIsCatch && LastActionWasCatch && RootLPad == LastRootLPad) {
- DEBUG(dbgs() << "setEHState for handler to " << currentEHNumber() << "\n");
- Actions[I]->setEHState(currentEHNumber());
- } else {
- DEBUG(dbgs() << "createUnwindMapEntry(" << currentEHNumber() << ", ");
- print_name(Actions[I]->getHandlerBlockOrFunc());
- DEBUG(dbgs() << ") with EH state " << NextState << "\n");
- createUnwindMapEntry(currentEHNumber(), Actions[I].get());
- DEBUG(dbgs() << "setEHState for handler to " << NextState << "\n");
- Actions[I]->setEHState(NextState);
- NextState++;
- }
- HandlerStack.push_back(std::move(Actions[I]));
- LastActionWasCatch = CurrActionIsCatch;
- LastRootLPad = RootLPad;
- }
-
- // This is used to defer numbering states for a handler until after the
- // last time it appears in an invoke action list.
- if (CS.isInvoke()) {
- for (int I = 0, E = HandlerStack.size(); I < E; ++I) {
- auto *Handler = cast<Function>(HandlerStack[I]->getHandlerBlockOrFunc());
- if (FuncInfo.LastInvoke[Handler] != cast<InvokeInst>(CS.getInstruction()))
- continue;
- FuncInfo.LastInvokeVisited[Handler] = true;
- DEBUG(dbgs() << "Last invoke of ");
- print_name(Handler);
- DEBUG(dbgs() << " has been visited.\n");
- }
- }
-
- DEBUG(dbgs() << "In EHState " << currentEHNumber() << " for CallSite: ");
- print_name(CS ? CS.getCalledValue() : nullptr);
- DEBUG(dbgs() << '\n');
-}
-
-void WinEHNumbering::popUnmatchedActions(int FirstMismatch) {
- // Don't recurse while we are looping over the handler stack. Instead, defer
- // the numbering of the catch handlers until we are done popping.
- SmallVector<CatchHandler *, 4> PoppedCatches;
- for (int I = HandlerStack.size() - 1; I >= FirstMismatch; --I) {
- std::unique_ptr<ActionHandler> Handler = HandlerStack.pop_back_val();
- if (isa<CatchHandler>(Handler.get()))
- PoppedCatches.push_back(cast<CatchHandler>(Handler.release()));
- }
-
- int TryHigh = NextState - 1;
- int LastTryLowIdx = 0;
- for (int I = 0, E = PoppedCatches.size(); I != E; ++I) {
- CatchHandler *CH = PoppedCatches[I];
- DEBUG(dbgs() << "Popped handler with state " << CH->getEHState() << "\n");
- if (I + 1 == E || CH->getEHState() != PoppedCatches[I + 1]->getEHState()) {
- int TryLow = CH->getEHState();
- auto Handlers =
- makeArrayRef(&PoppedCatches[LastTryLowIdx], I - LastTryLowIdx + 1);
- DEBUG(dbgs() << "createTryBlockMapEntry(" << TryLow << ", " << TryHigh);
- for (size_t J = 0; J < Handlers.size(); ++J) {
- DEBUG(dbgs() << ", ");
- print_name(Handlers[J]->getHandlerBlockOrFunc());
- }
- DEBUG(dbgs() << ")\n");
- createTryBlockMapEntry(TryLow, TryHigh, Handlers);
- LastTryLowIdx = I + 1;
- }
- }
-
- for (CatchHandler *CH : PoppedCatches) {
- if (auto *F = dyn_cast<Function>(CH->getHandlerBlockOrFunc())) {
- if (FuncInfo.LastInvokeVisited[F]) {
- DEBUG(dbgs() << "Assigning base state " << NextState << " to ");
- print_name(F);
- DEBUG(dbgs() << '\n');
- FuncInfo.HandlerBaseState[F] = NextState;
- DEBUG(dbgs() << "createUnwindMapEntry(" << currentEHNumber()
- << ", null)\n");
- createUnwindMapEntry(currentEHNumber(), nullptr);
- ++NextState;
- calculateStateNumbers(*F);
- }
- else {
- DEBUG(dbgs() << "Deferring handling of ");
- print_name(F);
- DEBUG(dbgs() << " until last invoke visited.\n");
- }
- }
- delete CH;
- }
-}
-
-void WinEHNumbering::calculateStateNumbers(const Function &F) {
- auto I = VisitedHandlers.insert(&F);
- if (!I.second)
- return; // We've already visited this handler, don't renumber it.
-
- int OldBaseState = CurrentBaseState;
- if (FuncInfo.HandlerBaseState.count(&F)) {
- CurrentBaseState = FuncInfo.HandlerBaseState[&F];
- }
-
- size_t SavedHandlerStackSize = HandlerStack.size();
-
- DEBUG(dbgs() << "Calculating state numbers for: " << F.getName() << '\n');
- SmallVector<std::unique_ptr<ActionHandler>, 4> ActionList;
- for (const BasicBlock &BB : F) {
- for (const Instruction &I : BB) {
- const auto *CI = dyn_cast<CallInst>(&I);
- if (!CI || CI->doesNotThrow())
- continue;
- processCallSite(None, CI);
- }
- const auto *II = dyn_cast<InvokeInst>(BB.getTerminator());
- if (!II)
- continue;
- const LandingPadInst *LPI = II->getLandingPadInst();
- auto *ActionsCall = dyn_cast<IntrinsicInst>(LPI->getNextNode());
- if (!ActionsCall)
- continue;
- assert(ActionsCall->getIntrinsicID() == Intrinsic::eh_actions);
- parseEHActions(ActionsCall, ActionList);
- if (ActionList.empty())
- continue;
- processCallSite(ActionList, II);
- ActionList.clear();
- FuncInfo.LandingPadStateMap[LPI] = currentEHNumber();
- DEBUG(dbgs() << "Assigning state " << currentEHNumber()
- << " to landing pad at " << LPI->getParent()->getName()
- << '\n');
- }
-
- // Pop any actions that were pushed on the stack for this function.
- popUnmatchedActions(SavedHandlerStackSize);
-
- DEBUG(dbgs() << "Assigning max state " << NextState - 1
- << " to " << F.getName() << '\n');
- FuncInfo.CatchHandlerMaxState[&F] = NextState - 1;
-
- CurrentBaseState = OldBaseState;
-}
-
-// This function follows the same basic traversal as calculateStateNumbers
-// but it is necessary to identify the root landing pad associated
-// with each action before we start assigning state numbers.
-void WinEHNumbering::findActionRootLPads(const Function &F) {
- auto I = VisitedHandlers.insert(&F);
- if (!I.second)
- return; // We've already visited this handler, don't revisit it.
-
- SmallVector<std::unique_ptr<ActionHandler>, 4> ActionList;
- for (const BasicBlock &BB : F) {
- const auto *II = dyn_cast<InvokeInst>(BB.getTerminator());
- if (!II)
- continue;
- const LandingPadInst *LPI = II->getLandingPadInst();
- auto *ActionsCall = dyn_cast<IntrinsicInst>(LPI->getNextNode());
- if (!ActionsCall)
- continue;
-
- assert(ActionsCall->getIntrinsicID() == Intrinsic::eh_actions);
- parseEHActions(ActionsCall, ActionList);
- if (ActionList.empty())
- continue;
- for (int I = 0, E = ActionList.size(); I < E; ++I) {
- if (auto *Handler
- = dyn_cast<Function>(ActionList[I]->getHandlerBlockOrFunc())) {
- FuncInfo.LastInvoke[Handler] = II;
- // Don't replace the root landing pad if we previously saw this
- // handler in a different function.
- if (FuncInfo.RootLPad.count(Handler) &&
- FuncInfo.RootLPad[Handler]->getParent()->getParent() != &F)
- continue;
- DEBUG(dbgs() << "Setting root lpad for ");
- print_name(Handler);
- DEBUG(dbgs() << " to " << LPI->getParent()->getName() << '\n');
- FuncInfo.RootLPad[Handler] = LPI;
- }
- }
- // Walk the actions again and look for nested handlers. This has to
- // happen after all of the actions have been processed in the current
- // function.
- for (int I = 0, E = ActionList.size(); I < E; ++I)
- if (auto *Handler
- = dyn_cast<Function>(ActionList[I]->getHandlerBlockOrFunc()))
- findActionRootLPads(*Handler);
- ActionList.clear();
- }
-}
-
/// clear - Clear out all the function-specific state. This returns this
/// FunctionLoweringInfo to an empty state, ready to be used for a
/// different function.
}
std::reverse(Actions.begin(), Actions.end());
}
+
+namespace {
+struct WinEHNumbering {
+ WinEHNumbering(WinEHFuncInfo &FuncInfo) : FuncInfo(FuncInfo),
+ CurrentBaseState(-1), NextState(0) {}
+
+ WinEHFuncInfo &FuncInfo;
+ int CurrentBaseState;
+ int NextState;
+
+ SmallVector<std::unique_ptr<ActionHandler>, 4> HandlerStack;
+ SmallPtrSet<const Function *, 4> VisitedHandlers;
+
+ int currentEHNumber() const {
+ return HandlerStack.empty() ? CurrentBaseState : HandlerStack.back()->getEHState();
+ }
+
+ void createUnwindMapEntry(int ToState, ActionHandler *AH);
+ void createTryBlockMapEntry(int TryLow, int TryHigh,
+ ArrayRef<CatchHandler *> Handlers);
+ void processCallSite(MutableArrayRef<std::unique_ptr<ActionHandler>> Actions,
+ ImmutableCallSite CS);
+ void popUnmatchedActions(int FirstMismatch);
+ void calculateStateNumbers(const Function &F);
+ void findActionRootLPads(const Function &F);
+};
+}
+
+void WinEHNumbering::createUnwindMapEntry(int ToState, ActionHandler *AH) {
+ WinEHUnwindMapEntry UME;
+ UME.ToState = ToState;
+ if (auto *CH = dyn_cast_or_null<CleanupHandler>(AH))
+ UME.Cleanup = cast<Function>(CH->getHandlerBlockOrFunc());
+ else
+ UME.Cleanup = nullptr;
+ FuncInfo.UnwindMap.push_back(UME);
+}
+
+void WinEHNumbering::createTryBlockMapEntry(int TryLow, int TryHigh,
+ ArrayRef<CatchHandler *> Handlers) {
+ // See if we already have an entry for this set of handlers.
+ // This is using iterators rather than a range-based for loop because
+ // if we find the entry we're looking for we'll need the iterator to erase it.
+ int NumHandlers = Handlers.size();
+ auto I = FuncInfo.TryBlockMap.begin();
+ auto E = FuncInfo.TryBlockMap.end();
+ for ( ; I != E; ++I) {
+ auto &Entry = *I;
+ if (Entry.HandlerArray.size() != (size_t)NumHandlers)
+ continue;
+ int N;
+ for (N = 0; N < NumHandlers; ++N) {
+ if (Entry.HandlerArray[N].Handler != Handlers[N]->getHandlerBlockOrFunc())
+ break; // breaks out of inner loop
+ }
+ // If all the handlers match, this is what we were looking for.
+ if (N == NumHandlers) {
+ break;
+ }
+ }
+
+ // If we found an existing entry for this set of handlers, extend the range
+ // but move the entry to the end of the map vector. The order of entries
+ // in the map is critical to the way that the runtime finds handlers.
+ // FIXME: Depending on what has happened with block ordering, this may
+ // incorrectly combine entries that should remain separate.
+ if (I != E) {
+ // Copy the existing entry.
+ WinEHTryBlockMapEntry Entry = *I;
+ Entry.TryLow = std::min(TryLow, Entry.TryLow);
+ Entry.TryHigh = std::max(TryHigh, Entry.TryHigh);
+ assert(Entry.TryLow <= Entry.TryHigh);
+ // Erase the old entry and add this one to the back.
+ FuncInfo.TryBlockMap.erase(I);
+ FuncInfo.TryBlockMap.push_back(Entry);
+ return;
+ }
+
+ // If we didn't find an entry, create a new one.
+ WinEHTryBlockMapEntry TBME;
+ TBME.TryLow = TryLow;
+ TBME.TryHigh = TryHigh;
+ assert(TBME.TryLow <= TBME.TryHigh);
+ for (CatchHandler *CH : Handlers) {
+ WinEHHandlerType HT;
+ if (CH->getSelector()->isNullValue()) {
+ HT.Adjectives = 0x40;
+ HT.TypeDescriptor = nullptr;
+ } else {
+ auto *GV = cast<GlobalVariable>(CH->getSelector()->stripPointerCasts());
+ // Selectors are always pointers to GlobalVariables with 'struct' type.
+ // The struct has two fields, adjectives and a type descriptor.
+ auto *CS = cast<ConstantStruct>(GV->getInitializer());
+ HT.Adjectives =
+ cast<ConstantInt>(CS->getAggregateElement(0U))->getZExtValue();
+ HT.TypeDescriptor =
+ cast<GlobalVariable>(CS->getAggregateElement(1)->stripPointerCasts());
+ }
+ HT.Handler = cast<Function>(CH->getHandlerBlockOrFunc());
+ HT.CatchObjRecoverIdx = CH->getExceptionVarIndex();
+ TBME.HandlerArray.push_back(HT);
+ }
+ FuncInfo.TryBlockMap.push_back(TBME);
+}
+
+static void print_name(const Value *V) {
+#ifndef NDEBUG
+ if (!V) {
+ DEBUG(dbgs() << "null");
+ return;
+ }
+
+ if (const auto *F = dyn_cast<Function>(V))
+ DEBUG(dbgs() << F->getName());
+ else
+ DEBUG(V->dump());
+#endif
+}
+
+void WinEHNumbering::processCallSite(
+ MutableArrayRef<std::unique_ptr<ActionHandler>> Actions,
+ ImmutableCallSite CS) {
+ DEBUG(dbgs() << "processCallSite (EH state = " << currentEHNumber()
+ << ") for: ");
+ print_name(CS ? CS.getCalledValue() : nullptr);
+ DEBUG(dbgs() << '\n');
+
+ DEBUG(dbgs() << "HandlerStack: \n");
+ for (int I = 0, E = HandlerStack.size(); I < E; ++I) {
+ DEBUG(dbgs() << " ");
+ print_name(HandlerStack[I]->getHandlerBlockOrFunc());
+ DEBUG(dbgs() << '\n');
+ }
+ DEBUG(dbgs() << "Actions: \n");
+ for (int I = 0, E = Actions.size(); I < E; ++I) {
+ DEBUG(dbgs() << " ");
+ print_name(Actions[I]->getHandlerBlockOrFunc());
+ DEBUG(dbgs() << '\n');
+ }
+ int FirstMismatch = 0;
+ for (int E = std::min(HandlerStack.size(), Actions.size()); FirstMismatch < E;
+ ++FirstMismatch) {
+ if (HandlerStack[FirstMismatch]->getHandlerBlockOrFunc() !=
+ Actions[FirstMismatch]->getHandlerBlockOrFunc())
+ break;
+ }
+
+ // Remove unmatched actions from the stack and process their EH states.
+ popUnmatchedActions(FirstMismatch);
+
+ DEBUG(dbgs() << "Pushing actions for CallSite: ");
+ print_name(CS ? CS.getCalledValue() : nullptr);
+ DEBUG(dbgs() << '\n');
+
+ bool LastActionWasCatch = false;
+ const LandingPadInst *LastRootLPad = nullptr;
+ for (size_t I = FirstMismatch; I != Actions.size(); ++I) {
+ // We can reuse eh states when pushing two catches for the same invoke.
+ bool CurrActionIsCatch = isa<CatchHandler>(Actions[I].get());
+ auto *Handler = cast<Function>(Actions[I]->getHandlerBlockOrFunc());
+ // Various conditions can lead to a handler being popped from the
+ // stack and re-pushed later. That shouldn't create a new state.
+ // FIXME: Can code optimization lead to re-used handlers?
+ if (FuncInfo.HandlerEnclosedState.count(Handler)) {
+ // If we already assigned the state enclosed by this handler re-use it.
+ Actions[I]->setEHState(FuncInfo.HandlerEnclosedState[Handler]);
+ continue;
+ }
+ const LandingPadInst* RootLPad = FuncInfo.RootLPad[Handler];
+ if (CurrActionIsCatch && LastActionWasCatch && RootLPad == LastRootLPad) {
+ DEBUG(dbgs() << "setEHState for handler to " << currentEHNumber() << "\n");
+ Actions[I]->setEHState(currentEHNumber());
+ } else {
+ DEBUG(dbgs() << "createUnwindMapEntry(" << currentEHNumber() << ", ");
+ print_name(Actions[I]->getHandlerBlockOrFunc());
+ DEBUG(dbgs() << ") with EH state " << NextState << "\n");
+ createUnwindMapEntry(currentEHNumber(), Actions[I].get());
+ DEBUG(dbgs() << "setEHState for handler to " << NextState << "\n");
+ Actions[I]->setEHState(NextState);
+ NextState++;
+ }
+ HandlerStack.push_back(std::move(Actions[I]));
+ LastActionWasCatch = CurrActionIsCatch;
+ LastRootLPad = RootLPad;
+ }
+
+ // This is used to defer numbering states for a handler until after the
+ // last time it appears in an invoke action list.
+ if (CS.isInvoke()) {
+ for (int I = 0, E = HandlerStack.size(); I < E; ++I) {
+ auto *Handler = cast<Function>(HandlerStack[I]->getHandlerBlockOrFunc());
+ if (FuncInfo.LastInvoke[Handler] != cast<InvokeInst>(CS.getInstruction()))
+ continue;
+ FuncInfo.LastInvokeVisited[Handler] = true;
+ DEBUG(dbgs() << "Last invoke of ");
+ print_name(Handler);
+ DEBUG(dbgs() << " has been visited.\n");
+ }
+ }
+
+ DEBUG(dbgs() << "In EHState " << currentEHNumber() << " for CallSite: ");
+ print_name(CS ? CS.getCalledValue() : nullptr);
+ DEBUG(dbgs() << '\n');
+}
+
+void WinEHNumbering::popUnmatchedActions(int FirstMismatch) {
+ // Don't recurse while we are looping over the handler stack. Instead, defer
+ // the numbering of the catch handlers until we are done popping.
+ SmallVector<CatchHandler *, 4> PoppedCatches;
+ for (int I = HandlerStack.size() - 1; I >= FirstMismatch; --I) {
+ std::unique_ptr<ActionHandler> Handler = HandlerStack.pop_back_val();
+ if (isa<CatchHandler>(Handler.get()))
+ PoppedCatches.push_back(cast<CatchHandler>(Handler.release()));
+ }
+
+ int TryHigh = NextState - 1;
+ int LastTryLowIdx = 0;
+ for (int I = 0, E = PoppedCatches.size(); I != E; ++I) {
+ CatchHandler *CH = PoppedCatches[I];
+ DEBUG(dbgs() << "Popped handler with state " << CH->getEHState() << "\n");
+ if (I + 1 == E || CH->getEHState() != PoppedCatches[I + 1]->getEHState()) {
+ int TryLow = CH->getEHState();
+ auto Handlers =
+ makeArrayRef(&PoppedCatches[LastTryLowIdx], I - LastTryLowIdx + 1);
+ DEBUG(dbgs() << "createTryBlockMapEntry(" << TryLow << ", " << TryHigh);
+ for (size_t J = 0; J < Handlers.size(); ++J) {
+ DEBUG(dbgs() << ", ");
+ print_name(Handlers[J]->getHandlerBlockOrFunc());
+ }
+ DEBUG(dbgs() << ")\n");
+ createTryBlockMapEntry(TryLow, TryHigh, Handlers);
+ LastTryLowIdx = I + 1;
+ }
+ }
+
+ for (CatchHandler *CH : PoppedCatches) {
+ if (auto *F = dyn_cast<Function>(CH->getHandlerBlockOrFunc())) {
+ if (FuncInfo.LastInvokeVisited[F]) {
+ DEBUG(dbgs() << "Assigning base state " << NextState << " to ");
+ print_name(F);
+ DEBUG(dbgs() << '\n');
+ FuncInfo.HandlerBaseState[F] = NextState;
+ DEBUG(dbgs() << "createUnwindMapEntry(" << currentEHNumber()
+ << ", null)\n");
+ createUnwindMapEntry(currentEHNumber(), nullptr);
+ ++NextState;
+ calculateStateNumbers(*F);
+ }
+ else {
+ DEBUG(dbgs() << "Deferring handling of ");
+ print_name(F);
+ DEBUG(dbgs() << " until last invoke visited.\n");
+ }
+ }
+ delete CH;
+ }
+}
+
+void WinEHNumbering::calculateStateNumbers(const Function &F) {
+ auto I = VisitedHandlers.insert(&F);
+ if (!I.second)
+ return; // We've already visited this handler, don't renumber it.
+
+ int OldBaseState = CurrentBaseState;
+ if (FuncInfo.HandlerBaseState.count(&F)) {
+ CurrentBaseState = FuncInfo.HandlerBaseState[&F];
+ }
+
+ size_t SavedHandlerStackSize = HandlerStack.size();
+
+ DEBUG(dbgs() << "Calculating state numbers for: " << F.getName() << '\n');
+ SmallVector<std::unique_ptr<ActionHandler>, 4> ActionList;
+ for (const BasicBlock &BB : F) {
+ for (const Instruction &I : BB) {
+ const auto *CI = dyn_cast<CallInst>(&I);
+ if (!CI || CI->doesNotThrow())
+ continue;
+ processCallSite(None, CI);
+ }
+ const auto *II = dyn_cast<InvokeInst>(BB.getTerminator());
+ if (!II)
+ continue;
+ const LandingPadInst *LPI = II->getLandingPadInst();
+ auto *ActionsCall = dyn_cast<IntrinsicInst>(LPI->getNextNode());
+ if (!ActionsCall)
+ continue;
+ assert(ActionsCall->getIntrinsicID() == Intrinsic::eh_actions);
+ parseEHActions(ActionsCall, ActionList);
+ if (ActionList.empty())
+ continue;
+ processCallSite(ActionList, II);
+ ActionList.clear();
+ FuncInfo.LandingPadStateMap[LPI] = currentEHNumber();
+ DEBUG(dbgs() << "Assigning state " << currentEHNumber()
+ << " to landing pad at " << LPI->getParent()->getName()
+ << '\n');
+ }
+
+ // Pop any actions that were pushed on the stack for this function.
+ popUnmatchedActions(SavedHandlerStackSize);
+
+ DEBUG(dbgs() << "Assigning max state " << NextState - 1
+ << " to " << F.getName() << '\n');
+ FuncInfo.CatchHandlerMaxState[&F] = NextState - 1;
+
+ CurrentBaseState = OldBaseState;
+}
+
+// This function follows the same basic traversal as calculateStateNumbers
+// but it is necessary to identify the root landing pad associated
+// with each action before we start assigning state numbers.
+void WinEHNumbering::findActionRootLPads(const Function &F) {
+ auto I = VisitedHandlers.insert(&F);
+ if (!I.second)
+ return; // We've already visited this handler, don't revisit it.
+
+ SmallVector<std::unique_ptr<ActionHandler>, 4> ActionList;
+ for (const BasicBlock &BB : F) {
+ const auto *II = dyn_cast<InvokeInst>(BB.getTerminator());
+ if (!II)
+ continue;
+ const LandingPadInst *LPI = II->getLandingPadInst();
+ auto *ActionsCall = dyn_cast<IntrinsicInst>(LPI->getNextNode());
+ if (!ActionsCall)
+ continue;
+
+ assert(ActionsCall->getIntrinsicID() == Intrinsic::eh_actions);
+ parseEHActions(ActionsCall, ActionList);
+ if (ActionList.empty())
+ continue;
+ for (int I = 0, E = ActionList.size(); I < E; ++I) {
+ if (auto *Handler
+ = dyn_cast<Function>(ActionList[I]->getHandlerBlockOrFunc())) {
+ FuncInfo.LastInvoke[Handler] = II;
+ // Don't replace the root landing pad if we previously saw this
+ // handler in a different function.
+ if (FuncInfo.RootLPad.count(Handler) &&
+ FuncInfo.RootLPad[Handler]->getParent()->getParent() != &F)
+ continue;
+ DEBUG(dbgs() << "Setting root lpad for ");
+ print_name(Handler);
+ DEBUG(dbgs() << " to " << LPI->getParent()->getName() << '\n');
+ FuncInfo.RootLPad[Handler] = LPI;
+ }
+ }
+ // Walk the actions again and look for nested handlers. This has to
+ // happen after all of the actions have been processed in the current
+ // function.
+ for (int I = 0, E = ActionList.size(); I < E; ++I)
+ if (auto *Handler
+ = dyn_cast<Function>(ActionList[I]->getHandlerBlockOrFunc()))
+ findActionRootLPads(*Handler);
+ ActionList.clear();
+ }
+}
+
+void llvm::calculateWinCXXEHStateNumbers(const Function *ParentFn,
+ WinEHFuncInfo &FuncInfo) {
+ // Return if it's already been done.
+ if (!FuncInfo.LandingPadStateMap.empty())
+ return;
+
+ WinEHNumbering Num(FuncInfo);
+ Num.findActionRootLPads(*ParentFn);
+ // The VisitedHandlers list is used by both findActionRootLPads and
+ // calculateStateNumbers, but both functions need to visit all handlers.
+ Num.VisitedHandlers.clear();
+ Num.calculateStateNumbers(*ParentFn);
+ // Pop everything on the handler stack.
+ // It may be necessary to call this more than once because a handler can
+ // be pushed on the stack as a result of clearing the stack.
+ while (!Num.HandlerStack.empty())
+ Num.processCallSite(None, ImmutableCallSite());
+}
#include "X86.h"
#include "llvm/Analysis/LibCallSemantics.h"
+#include "llvm/CodeGen/MachineModuleInfo.h"
#include "llvm/CodeGen/Passes.h"
#include "llvm/CodeGen/WinEHFuncInfo.h"
#include "llvm/IR/Dominators.h"
private:
void emitExceptionRegistrationRecord(Function *F);
- void linkExceptionRegistration(IRBuilder<> &Builder, Value *RegNode,
- Value *Handler);
- void unlinkExceptionRegistration(IRBuilder<> &Builder, Value *RegNode);
+ void linkExceptionRegistration(IRBuilder<> &Builder, Value *Handler);
+ void unlinkExceptionRegistration(IRBuilder<> &Builder);
+ void addCXXStateStores(Function &F, MachineModuleInfo &MMI);
+ void addCXXStateStoresToFunclet(Value *ParentRegNode, WinEHFuncInfo &FuncInfo,
+ Function &F, int BaseState);
+ void insertStateNumberStore(Value *ParentRegNode, Instruction *IP, int State);
Value *emitEHLSDA(IRBuilder<> &Builder, Function *F);
Function *generateLSDAInEAXThunk(Function *ParentFunc);
+ int escapeRegNode(Function &F);
+
// Module-level type getters.
Type *getEHRegistrationType();
Type *getSEH3RegistrationType();
// Per-function state
EHPersonality Personality = EHPersonality::Unknown;
Function *PersonalityFn = nullptr;
+
+ /// The stack allocation containing all EH data, including the link in the
+ /// fs:00 chain and the current state.
+ AllocaInst *RegNode = nullptr;
+
+ /// Struct type of RegNode. Used for GEPing.
+ Type *RegNodeTy = nullptr;
+
+ /// The index of the state field of RegNode.
+ int StateFieldIndex = ~0U;
+
+ /// The linked list node subobject inside of RegNode.
+ Value *Link = nullptr;
};
}
return false;
emitExceptionRegistrationRecord(&F);
- // FIXME: State insertion.
+
+ auto *MMIPtr = getAnalysisIfAvailable<MachineModuleInfo>();
+ assert(MMIPtr && "MachineModuleInfo should always be available");
+ MachineModuleInfo &MMI = *MMIPtr;
+ if (Personality == EHPersonality::MSVC_CXX) {
+ addCXXStateStores(F, MMI);
+ }
// Reset per-function state.
PersonalityFn = nullptr;
StringRef PersonalityName = PersonalityFn->getName();
IRBuilder<> Builder(&F->getEntryBlock(), F->getEntryBlock().begin());
Type *Int8PtrType = Builder.getInt8PtrTy();
- Value *SubRecord = nullptr;
if (PersonalityName == "__CxxFrameHandler3") {
- Type *RegNodeTy = getCXXEH3RegistrationType();
- Value *RegNode = Builder.CreateAlloca(RegNodeTy);
+ RegNodeTy = getCXXEH3RegistrationType();
+ RegNode = Builder.CreateAlloca(RegNodeTy);
// FIXME: We can skip this in -GS- mode, when we figure that out.
// SavedESP = llvm.stacksave()
Value *SP = Builder.CreateCall(
Intrinsic::getDeclaration(TheModule, Intrinsic::stacksave), {});
Builder.CreateStore(SP, Builder.CreateStructGEP(RegNodeTy, RegNode, 0));
// TryLevel = -1
- Builder.CreateStore(Builder.getInt32(-1),
- Builder.CreateStructGEP(RegNodeTy, RegNode, 2));
+ StateFieldIndex = 2;
+ insertStateNumberStore(RegNode, Builder.GetInsertPoint(), -1);
// Handler = __ehhandler$F
Function *Trampoline = generateLSDAInEAXThunk(F);
- SubRecord = Builder.CreateStructGEP(RegNodeTy, RegNode, 1);
- linkExceptionRegistration(Builder, SubRecord, Trampoline);
+ Link = Builder.CreateStructGEP(RegNodeTy, RegNode, 1);
+ linkExceptionRegistration(Builder, Trampoline);
} else if (PersonalityName == "_except_handler3") {
- Type *RegNodeTy = getSEH3RegistrationType();
- Value *RegNode = Builder.CreateAlloca(RegNodeTy);
+ RegNodeTy = getSEH3RegistrationType();
+ RegNode = Builder.CreateAlloca(RegNodeTy);
// TryLevel = -1
- Builder.CreateStore(Builder.getInt32(-1),
- Builder.CreateStructGEP(RegNodeTy, RegNode, 2));
+ StateFieldIndex = 2;
+ insertStateNumberStore(RegNode, Builder.GetInsertPoint(), -1);
// ScopeTable = llvm.x86.seh.lsda(F)
Value *LSDA = emitEHLSDA(Builder, F);
Builder.CreateStore(LSDA, Builder.CreateStructGEP(RegNodeTy, RegNode, 1));
- SubRecord = Builder.CreateStructGEP(RegNodeTy, RegNode, 0);
- linkExceptionRegistration(Builder, SubRecord, PersonalityFn);
+ Link = Builder.CreateStructGEP(RegNodeTy, RegNode, 0);
+ linkExceptionRegistration(Builder, PersonalityFn);
} else if (PersonalityName == "_except_handler4") {
- Type *RegNodeTy = getSEH4RegistrationType();
- Value *RegNode = Builder.CreateAlloca(RegNodeTy);
+ RegNodeTy = getSEH4RegistrationType();
+ RegNode = Builder.CreateAlloca(RegNodeTy);
// SavedESP = llvm.stacksave()
Value *SP = Builder.CreateCall(
Intrinsic::getDeclaration(TheModule, Intrinsic::stacksave), {});
Builder.CreateStore(SP, Builder.CreateStructGEP(RegNodeTy, RegNode, 0));
- // TryLevel = -2
- Builder.CreateStore(Builder.getInt32(-2),
- Builder.CreateStructGEP(RegNodeTy, RegNode, 4));
+ // TryLevel = -1
+ StateFieldIndex = 4;
+ insertStateNumberStore(RegNode, Builder.GetInsertPoint(), -1);
// FIXME: XOR the LSDA with __security_cookie.
// ScopeTable = llvm.x86.seh.lsda(F)
Value *FI8 = Builder.CreateBitCast(F, Int8PtrType);
Value *LSDA = Builder.CreateCall(
Intrinsic::getDeclaration(TheModule, Intrinsic::x86_seh_lsda), FI8);
Builder.CreateStore(LSDA, Builder.CreateStructGEP(RegNodeTy, RegNode, 1));
- SubRecord = Builder.CreateStructGEP(RegNodeTy, RegNode, 2);
- linkExceptionRegistration(Builder, SubRecord, PersonalityFn);
+ Link = Builder.CreateStructGEP(RegNodeTy, RegNode, 2);
+ linkExceptionRegistration(Builder, PersonalityFn);
} else {
llvm_unreachable("unexpected personality function");
}
- // FIXME: Insert an unlink before all returns.
+ // Insert an unlink before all returns.
for (BasicBlock &BB : *F) {
TerminatorInst *T = BB.getTerminator();
if (!isa<ReturnInst>(T))
continue;
Builder.SetInsertPoint(T);
- unlinkExceptionRegistration(Builder, SubRecord);
+ unlinkExceptionRegistration(Builder);
}
}
}
void WinEHStatePass::linkExceptionRegistration(IRBuilder<> &Builder,
- Value *RegNode, Value *Handler) {
- Type *RegNodeTy = getEHRegistrationType();
+ Value *Handler) {
+ Type *LinkTy = getEHRegistrationType();
// Handler = Handler
Handler = Builder.CreateBitCast(Handler, Builder.getInt8PtrTy());
- Builder.CreateStore(Handler, Builder.CreateStructGEP(RegNodeTy, RegNode, 1));
+ Builder.CreateStore(Handler, Builder.CreateStructGEP(LinkTy, Link, 1));
// Next = [fs:00]
Constant *FSZero =
- Constant::getNullValue(RegNodeTy->getPointerTo()->getPointerTo(257));
+ Constant::getNullValue(LinkTy->getPointerTo()->getPointerTo(257));
Value *Next = Builder.CreateLoad(FSZero);
- Builder.CreateStore(Next, Builder.CreateStructGEP(RegNodeTy, RegNode, 0));
- // [fs:00] = RegNode
- Builder.CreateStore(RegNode, FSZero);
+ Builder.CreateStore(Next, Builder.CreateStructGEP(LinkTy, Link, 0));
+ // [fs:00] = Link
+ Builder.CreateStore(Link, FSZero);
}
-void WinEHStatePass::unlinkExceptionRegistration(IRBuilder<> &Builder,
- Value *RegNode) {
- // Clone RegNode into the current BB for better address mode folding.
- if (auto *GEP = dyn_cast<GetElementPtrInst>(RegNode)) {
+void WinEHStatePass::unlinkExceptionRegistration(IRBuilder<> &Builder) {
+ // Clone Link into the current BB for better address mode folding.
+ if (auto *GEP = dyn_cast<GetElementPtrInst>(Link)) {
GEP = cast<GetElementPtrInst>(GEP->clone());
Builder.Insert(GEP);
- RegNode = GEP;
+ Link = GEP;
}
- Type *RegNodeTy = getEHRegistrationType();
- // [fs:00] = RegNode->Next
+ Type *LinkTy = getEHRegistrationType();
+ // [fs:00] = Link->Next
Value *Next =
- Builder.CreateLoad(Builder.CreateStructGEP(RegNodeTy, RegNode, 0));
+ Builder.CreateLoad(Builder.CreateStructGEP(LinkTy, Link, 0));
Constant *FSZero =
- Constant::getNullValue(RegNodeTy->getPointerTo()->getPointerTo(257));
+ Constant::getNullValue(LinkTy->getPointerTo()->getPointerTo(257));
Builder.CreateStore(Next, FSZero);
}
+
+void WinEHStatePass::addCXXStateStores(Function &F, MachineModuleInfo &MMI) {
+ WinEHFuncInfo &FuncInfo = MMI.getWinEHFuncInfo(&F);
+ calculateWinCXXEHStateNumbers(&F, FuncInfo);
+
+ // The base state for the parent is -1.
+ addCXXStateStoresToFunclet(RegNode, FuncInfo, F, -1);
+
+ // Set up RegNodeEscapeIndex
+ int RegNodeEscapeIndex = escapeRegNode(F);
+
+ // Only insert stores in catch handlers.
+ Function *FrameRecover =
+ Intrinsic::getDeclaration(TheModule, Intrinsic::framerecover);
+ Function *FrameAddress =
+ Intrinsic::getDeclaration(TheModule, Intrinsic::frameaddress);
+ Constant *FI8 =
+ ConstantExpr::getBitCast(&F, Type::getInt8PtrTy(TheModule->getContext()));
+ for (auto P : FuncInfo.HandlerBaseState) {
+ Function *Handler = const_cast<Function *>(P.first);
+ int BaseState = P.second;
+ IRBuilder<> Builder(&Handler->getEntryBlock(),
+ Handler->getEntryBlock().begin());
+ // FIXME: Find and reuse such a call if present.
+ Value *ParentFP = Builder.CreateCall(FrameAddress, {Builder.getInt32(1)});
+ Value *RecoveredRegNode = Builder.CreateCall(
+ FrameRecover, {FI8, ParentFP, Builder.getInt32(RegNodeEscapeIndex)});
+ RecoveredRegNode =
+ Builder.CreateBitCast(RecoveredRegNode, RegNodeTy->getPointerTo(0));
+ addCXXStateStoresToFunclet(RecoveredRegNode, FuncInfo, *Handler, BaseState);
+ }
+}
+
+/// Escape RegNode so that we can access it from child handlers. Find the call
+/// to frameescape, if any, in the entry block and append RegNode to the list
+/// of arguments.
+int WinEHStatePass::escapeRegNode(Function &F) {
+ // Find the call to frameescape and extract its arguments.
+ IntrinsicInst *EscapeCall = nullptr;
+ for (Instruction &I : F.getEntryBlock()) {
+ IntrinsicInst *II = dyn_cast<IntrinsicInst>(&I);
+ if (II && II->getIntrinsicID() == Intrinsic::frameescape) {
+ EscapeCall = II;
+ break;
+ }
+ }
+ SmallVector<Value *, 8> Args;
+ if (EscapeCall) {
+ auto Ops = EscapeCall->arg_operands();
+ Args.append(Ops.begin(), Ops.end());
+ }
+ Args.push_back(RegNode);
+
+ // Replace the call (if it exists) with new one. Otherwise, insert at the end
+ // of the entry block.
+ IRBuilder<> Builder(&F.getEntryBlock(),
+ EscapeCall ? EscapeCall : F.getEntryBlock().end());
+ Builder.CreateCall(
+ Intrinsic::getDeclaration(TheModule, Intrinsic::frameescape), Args);
+ if (EscapeCall)
+ EscapeCall->eraseFromParent();
+ return Args.size() - 1;
+}
+
+void WinEHStatePass::addCXXStateStoresToFunclet(Value *ParentRegNode,
+ WinEHFuncInfo &FuncInfo,
+ Function &F, int BaseState) {
+ // Iterate all the instructions and emit state number stores.
+ for (BasicBlock &BB : F) {
+ for (Instruction &I : BB) {
+ if (auto *CI = dyn_cast<CallInst>(&I)) {
+ // Possibly throwing call instructions have no actions to take after
+ // an unwind. Ensure they are in the -1 state.
+ if (CI->doesNotThrow())
+ continue;
+ insertStateNumberStore(ParentRegNode, CI, BaseState);
+ } else if (auto *II = dyn_cast<InvokeInst>(&I)) {
+ // Look up the state number of the landingpad this unwinds to.
+ 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);
+ }
+ }
+ }
+}
+
+void WinEHStatePass::insertStateNumberStore(Value *ParentRegNode,
+ Instruction *IP, int State) {
+ IRBuilder<> Builder(IP);
+ Value *StateField =
+ Builder.CreateStructGEP(RegNodeTy, ParentRegNode, StateFieldIndex);
+ Builder.CreateStore(Builder.getInt32(State), StateField);
+}
--- /dev/null
+; RUN: llc -mtriple=i686-pc-windows-msvc < %s | FileCheck %s
+
+; Based on this source:
+; extern "C" void may_throw(int);
+; void f() {
+; try {
+; may_throw(1);
+; try {
+; may_throw(2);
+; } catch (int) {
+; may_throw(3);
+; }
+; } catch (int) {
+; may_throw(4);
+; }
+; }
+
+%rtti.TypeDescriptor2 = type { i8**, i8*, [3 x i8] }
+%eh.CatchHandlerType = type { i32, i8* }
+
+declare void @may_throw(i32)
+declare i32 @__CxxFrameHandler3(...)
+declare void @llvm.eh.begincatch(i8*, i8*)
+declare void @llvm.eh.endcatch()
+declare i32 @llvm.eh.typeid.for(i8*)
+
+$"\01??_R0H@8" = comdat any
+
+@"\01??_7type_info@@6B@" = external constant i8*
+@"\01??_R0H@8" = linkonce_odr global %rtti.TypeDescriptor2 { i8** @"\01??_7type_info@@6B@", i8* null, [3 x i8] c".H\00" }, comdat
+@llvm.eh.handlertype.H.0 = private unnamed_addr constant %eh.CatchHandlerType { i32 0, i8* bitcast (%rtti.TypeDescriptor2* @"\01??_R0H@8" to i8*) }, section "llvm.metadata"
+
+define void @f() #0 {
+entry:
+ invoke void @may_throw(i32 1)
+ to label %invoke.cont unwind label %lpad
+
+invoke.cont: ; preds = %entry
+ invoke void @may_throw(i32 2)
+ to label %try.cont.9 unwind label %lpad.1
+
+try.cont.9: ; preds = %invoke.cont.3, %invoke.cont, %catch.7
+ ; FIXME: Something about our CFG breaks TailDuplication. This empy asm blocks
+ ; it so we can focus on testing the state numbering.
+ call void asm sideeffect "", "~{dirflag},~{fpsr},~{flags}"()
+ ret void
+
+lpad: ; preds = %catch, %entry
+ %0 = landingpad { i8*, i32 } personality i8* bitcast (i32 (...)* @__CxxFrameHandler3 to i8*)
+ catch %eh.CatchHandlerType* @llvm.eh.handlertype.H.0
+ %1 = extractvalue { i8*, i32 } %0, 0
+ %2 = extractvalue { i8*, i32 } %0, 1
+ br label %catch.dispatch.4
+
+lpad.1: ; preds = %invoke.cont
+ %3 = landingpad { i8*, i32 } personality i8* bitcast (i32 (...)* @__CxxFrameHandler3 to i8*)
+ catch i8* bitcast (%eh.CatchHandlerType* @llvm.eh.handlertype.H.0 to i8*)
+ %4 = extractvalue { i8*, i32 } %3, 0
+ %5 = extractvalue { i8*, i32 } %3, 1
+ %6 = tail call i32 @llvm.eh.typeid.for(i8* bitcast (%eh.CatchHandlerType* @llvm.eh.handlertype.H.0 to i8*)) #3
+ %matches = icmp eq i32 %5, %6
+ br i1 %matches, label %catch, label %catch.dispatch.4
+
+catch.dispatch.4: ; preds = %lpad.1, %lpad
+ %exn.slot.0 = phi i8* [ %4, %lpad.1 ], [ %1, %lpad ]
+ %ehselector.slot.0 = phi i32 [ %5, %lpad.1 ], [ %2, %lpad ]
+ %.pre = tail call i32 @llvm.eh.typeid.for(i8* bitcast (%eh.CatchHandlerType* @llvm.eh.handlertype.H.0 to i8*)) #3
+ %matches6 = icmp eq i32 %ehselector.slot.0, %.pre
+ br i1 %matches6, label %catch.7, label %eh.resume
+
+catch.7: ; preds = %catch.dispatch.4
+ tail call void @llvm.eh.begincatch(i8* %exn.slot.0, i8* null) #3
+ tail call void @may_throw(i32 4)
+ tail call void @llvm.eh.endcatch() #3
+ br label %try.cont.9
+
+catch: ; preds = %lpad.1
+ tail call void @llvm.eh.begincatch(i8* %4, i8* null) #3
+ invoke void @may_throw(i32 3)
+ to label %invoke.cont.3 unwind label %lpad
+
+invoke.cont.3: ; preds = %catch
+ tail call void @llvm.eh.endcatch() #3
+ br label %try.cont.9
+
+eh.resume: ; preds = %catch.dispatch.4
+ %lpad.val = insertvalue { i8*, i32 } undef, i8* %exn.slot.0, 0
+ %lpad.val.12 = insertvalue { i8*, i32 } %lpad.val, i32 %ehselector.slot.0, 1
+ resume { i8*, i32 } %lpad.val.12
+}
+
+; CHECK-LABEL: _f:
+; CHECK: movl $-1, [[state:[0-9]+]](%esp)
+; CHECK: movl $___ehhandler$f, {{.*}}
+;
+; CHECK: movl $0, [[state]](%esp)
+; CHECK: movl $1, (%esp)
+; CHECK: calll _may_throw
+;
+; CHECK: movl $1, [[state]](%esp)
+; CHECK: movl $2, (%esp)
+; CHECK: calll _may_throw
+
+; CHECK-LABEL: _f.catch:
+; CHECK: movl $4, Lf$frame_escape_{{[0-9]+.*}}
+; CHECK: movl $4, (%esp)
+; CHECK: calll _may_throw
+
+; CHECK-LABEL: _f.catch.1:
+; CHECK: movl $3, Lf$frame_escape_{{[0-9]+.*}}
+; CHECK: movl $3, (%esp)
+; CHECK: calll _may_throw
; CHECK-LABEL: _use_except_handler4:
; CHECK: subl ${{[0-9]+}}, %esp
; CHECK: movl %esp, (%esp)
-; CHECK: movl $-2, 20(%esp)
+; CHECK: movl $-1, 20(%esp)
; CHECK: movl $L__ehtable$use_except_handler4, 4(%esp)
; CHECK: leal 8(%esp), %[[node:[^ ,]*]]
; CHECK: movl $__except_handler4, 12(%esp)
; CHECK: movl %fs:0, %[[next:[^ ,]*]]
; CHECK: movl %[[next]], 4(%esp)
; CHECK: movl %[[node]], %fs:0
+; CHECK: movl $0, 12(%esp)
; CHECK: calll _may_throw_or_crash
; CHECK: movl 4(%esp), %[[next:[^ ,]*]]
; CHECK: movl %[[next]], %fs:0
projects / llvm / commitdiff