[llvm] r233824 - Fix WinEHPrepare bug with multiple catch handlers
Andrew Kaylor
andrew.kaylor at intel.com
Wed Apr 1 10:21:26 PDT 2015
Author: akaylor
Date: Wed Apr 1 12:21:25 2015
New Revision: 233824
URL: http://llvm.org/viewvc/llvm-project?rev=233824&view=rev
Log:
Fix WinEHPrepare bug with multiple catch handlers
Differential Revision: http://reviews.llvm.org/D8682
Added:
llvm/trunk/test/CodeGen/WinEH/cppeh-multi-catch.ll
Modified:
llvm/trunk/lib/CodeGen/WinEHPrepare.cpp
Modified: llvm/trunk/lib/CodeGen/WinEHPrepare.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/CodeGen/WinEHPrepare.cpp?rev=233824&r1=233823&r2=233824&view=diff
==============================================================================
--- llvm/trunk/lib/CodeGen/WinEHPrepare.cpp (original)
+++ llvm/trunk/lib/CodeGen/WinEHPrepare.cpp Wed Apr 1 12:21:25 2015
@@ -21,6 +21,7 @@
#include "llvm/ADT/TinyPtrVector.h"
#include "llvm/Analysis/LibCallSemantics.h"
#include "llvm/CodeGen/WinEHFuncInfo.h"
+#include "llvm/IR/Dominators.h"
#include "llvm/IR/Function.h"
#include "llvm/IR/IRBuilder.h"
#include "llvm/IR/Instructions.h"
@@ -34,6 +35,7 @@
#include "llvm/Transforms/Utils/BasicBlockUtils.h"
#include "llvm/Transforms/Utils/Cloning.h"
#include "llvm/Transforms/Utils/Local.h"
+#include "llvm/Transforms/Utils/PromoteMemToReg.h"
#include <memory>
using namespace llvm;
@@ -62,7 +64,7 @@ class WinEHPrepare : public FunctionPass
public:
static char ID; // Pass identification, replacement for typeid.
WinEHPrepare(const TargetMachine *TM = nullptr)
- : FunctionPass(ID) {}
+ : FunctionPass(ID), DT(nullptr) {}
bool runOnFunction(Function &Fn) override;
@@ -77,6 +79,7 @@ public:
private:
bool prepareExceptionHandlers(Function &F,
SmallVectorImpl<LandingPadInst *> &LPads);
+ void promoteLandingPadValues(LandingPadInst *LPad);
bool outlineHandler(ActionHandler *Action, Function *SrcFn,
LandingPadInst *LPad, BasicBlock *StartBB,
FrameVarInfoMap &VarInfo);
@@ -89,10 +92,11 @@ private:
void processSEHCatchHandler(CatchHandler *Handler, BasicBlock *StartBB);
// All fields are reset by runOnFunction.
+ DominatorTree *DT;
EHPersonality Personality;
CatchHandlerMapTy CatchHandlerMap;
CleanupHandlerMapTy CleanupHandlerMap;
- DenseMap<const LandingPadInst *, LandingPadMap> LPadMaps;
+ DenseMap<const LandingPadInst *, LandingPadMap> LPadMaps;
};
class WinEHFrameVariableMaterializer : public ValueMaterializer {
@@ -115,37 +119,18 @@ public:
bool isInitialized() { return OriginLPad != nullptr; }
- bool mapIfEHPtrLoad(const LoadInst *Load) {
- return mapIfEHLoad(Load, EHPtrStores, EHPtrStoreAddrs);
- }
- bool mapIfSelectorLoad(const LoadInst *Load) {
- return mapIfEHLoad(Load, SelectorStores, SelectorStoreAddrs);
- }
-
bool isOriginLandingPadBlock(const BasicBlock *BB) const;
bool isLandingPadSpecificInst(const Instruction *Inst) const;
- void remapSelector(ValueToValueMapTy &VMap, Value *MappedValue) const;
+ void remapEHValues(ValueToValueMapTy &VMap, Value *EHPtrValue,
+ Value *SelectorValue) const;
private:
- bool mapIfEHLoad(const LoadInst *Load,
- SmallVectorImpl<const StoreInst *> &Stores,
- SmallVectorImpl<const Value *> &StoreAddrs);
-
const LandingPadInst *OriginLPad;
// We will normally only see one of each of these instructions, but
// if more than one occurs for some reason we can handle that.
TinyPtrVector<const ExtractValueInst *> ExtractedEHPtrs;
TinyPtrVector<const ExtractValueInst *> ExtractedSelectors;
-
- // In optimized code, there will typically be at most one instance of
- // each of the following, but in unoptimized IR it is not uncommon
- // for the values to be stored, loaded and then stored again. In that
- // case we will create a second entry for each store and store address.
- SmallVector<const StoreInst *, 2> EHPtrStores;
- SmallVector<const StoreInst *, 2> SelectorStores;
- SmallVector<const Value *, 2> EHPtrStoreAddrs;
- SmallVector<const Value *, 2> SelectorStoreAddrs;
};
class WinEHCloningDirectorBase : public CloningDirector {
@@ -298,6 +283,8 @@ bool WinEHPrepare::runOnFunction(Functio
if (!isMSVCEHPersonality(Personality))
return false;
+ DT = &getAnalysis<DominatorTreeWrapperPass>().getDomTree();
+
if (isAsynchronousEHPersonality(Personality) && !SEHPrepare) {
// Replace all resume instructions with unreachable.
// FIXME: Remove this once the backend can handle the prepared IR.
@@ -317,7 +304,9 @@ bool WinEHPrepare::doFinalization(Module
return false;
}
-void WinEHPrepare::getAnalysisUsage(AnalysisUsage &AU) const {}
+void WinEHPrepare::getAnalysisUsage(AnalysisUsage &AU) const {
+ AU.addRequired<DominatorTreeWrapperPass>();
+}
bool WinEHPrepare::prepareExceptionHandlers(
Function &F, SmallVectorImpl<LandingPadInst *> &LPads) {
@@ -360,6 +349,10 @@ bool WinEHPrepare::prepareExceptionHandl
if (LPadHasActionList)
continue;
+ // If either of the values in the aggregate returned by the landing pad is
+ // extracted and stored to memory, promote the stored value to a register.
+ promoteLandingPadValues(LPad);
+
LandingPadActions Actions;
mapLandingPadBlocks(LPad, Actions);
@@ -564,6 +557,38 @@ bool WinEHPrepare::prepareExceptionHandl
return HandlersOutlined;
}
+void WinEHPrepare::promoteLandingPadValues(LandingPadInst *LPad) {
+ // If the return values of the landing pad instruction are extracted and
+ // stored to memory, we want to promote the store locations to reg values.
+ SmallVector<AllocaInst *, 2> EHAllocas;
+
+ // The landingpad instruction returns an aggregate value. Typically, its
+ // value will be passed to a pair of extract value instructions and the
+ // results of those extracts are often passed to store instructions.
+ // In unoptimized code the stored value will often be loaded and then stored
+ // again.
+ for (auto *U : LPad->users()) {
+ ExtractValueInst *Extract = dyn_cast<ExtractValueInst>(U);
+ if (!Extract)
+ continue;
+
+ for (auto *EU : Extract->users()) {
+ if (auto *Store = dyn_cast<StoreInst>(EU)) {
+ auto *AV = cast<AllocaInst>(Store->getPointerOperand());
+ EHAllocas.push_back(AV);
+ }
+ }
+ }
+
+ // We can't do this without a dominator tree.
+ assert(DT);
+
+ if (!EHAllocas.empty()) {
+ PromoteMemToReg(EHAllocas, *DT);
+ EHAllocas.clear();
+ }
+}
+
// This function examines a block to determine whether the block ends with a
// conditional branch to a catch handler based on a selector comparison.
// This function is used both by the WinEHPrepare::findSelectorComparison() and
@@ -640,9 +665,12 @@ bool WinEHPrepare::outlineHandler(Action
if (auto *CatchAction = dyn_cast<CatchHandler>(Action)) {
Constant *Sel = CatchAction->getSelector();
Director.reset(new WinEHCatchDirector(Handler, Sel, VarInfo, LPadMap));
- LPadMap.remapSelector(VMap, ConstantInt::get(Type::getInt32Ty(Context), 1));
+ LPadMap.remapEHValues(VMap, UndefValue::get(Int8PtrType),
+ ConstantInt::get(Type::getInt32Ty(Context), 1));
} else {
Director.reset(new WinEHCleanupDirector(Handler, VarInfo, LPadMap));
+ LPadMap.remapEHValues(VMap, UndefValue::get(Int8PtrType),
+ UndefValue::get(Type::getInt32Ty(Context)));
}
SmallVector<ReturnInst *, 8> Returns;
@@ -730,9 +758,8 @@ void LandingPadMap::mapLandingPad(const
// The landingpad instruction returns an aggregate value. Typically, its
// value will be passed to a pair of extract value instructions and the
- // results of those extracts are often passed to store instructions.
- // In unoptimized code the stored value will often be loaded and then stored
- // again.
+ // results of those extracts will have been promoted to reg values before
+ // this routine is called.
for (auto *U : LPad->users()) {
const ExtractValueInst *Extract = dyn_cast<ExtractValueInst>(U);
if (!Extract)
@@ -743,33 +770,10 @@ void LandingPadMap::mapLandingPad(const
assert((Idx == 0 || Idx == 1) &&
"Unexpected operation: extracting an unknown landing pad element");
if (Idx == 0) {
- // Element 0 doesn't directly corresponds to anything in the WinEH
- // scheme.
- // It will be stored to a memory location, then later loaded and finally
- // the loaded value will be used as the argument to an
- // llvm.eh.begincatch
- // call. We're tracking it here so that we can skip the store and load.
ExtractedEHPtrs.push_back(Extract);
} else if (Idx == 1) {
- // Element 1 corresponds to the filter selector. We'll map it to 1 for
- // matching purposes, but it will also probably be stored to memory and
- // reloaded, so we need to track the instuction so that we can map the
- // loaded value too.
ExtractedSelectors.push_back(Extract);
}
-
- // Look for stores of the extracted values.
- for (auto *EU : Extract->users()) {
- if (auto *Store = dyn_cast<StoreInst>(EU)) {
- if (Idx == 1) {
- SelectorStores.push_back(Store);
- SelectorStoreAddrs.push_back(Store->getPointerOperand());
- } else {
- EHPtrStores.push_back(Store);
- EHPtrStoreAddrs.push_back(Store->getPointerOperand());
- }
- }
- }
}
}
@@ -788,47 +792,16 @@ bool LandingPadMap::isLandingPadSpecific
if (Inst == Extract)
return true;
}
- for (auto *Store : EHPtrStores) {
- if (Inst == Store)
- return true;
- }
- for (auto *Store : SelectorStores) {
- if (Inst == Store)
- return true;
- }
-
return false;
}
-void LandingPadMap::remapSelector(ValueToValueMapTy &VMap,
- Value *MappedValue) const {
- // Remap all selector extract instructions to the specified value.
+void LandingPadMap::remapEHValues(ValueToValueMapTy &VMap, Value *EHPtrValue,
+ Value *SelectorValue) const {
+ // Remap all landing pad extract instructions to the specified values.
+ for (auto *Extract : ExtractedEHPtrs)
+ VMap[Extract] = EHPtrValue;
for (auto *Extract : ExtractedSelectors)
- VMap[Extract] = MappedValue;
-}
-
-bool LandingPadMap::mapIfEHLoad(const LoadInst *Load,
- SmallVectorImpl<const StoreInst *> &Stores,
- SmallVectorImpl<const Value *> &StoreAddrs) {
- // This makes the assumption that a store we've previously seen dominates
- // this load instruction. That might seem like a rather huge assumption,
- // but given the way that landingpads are constructed its fairly safe.
- // FIXME: Add debug/assert code that verifies this.
- const Value *LoadAddr = Load->getPointerOperand();
- for (auto *StoreAddr : StoreAddrs) {
- if (LoadAddr == StoreAddr) {
- // Handle the common debug scenario where this loaded value is stored
- // to a different location.
- for (auto *U : Load->users()) {
- if (auto *Store = dyn_cast<StoreInst>(U)) {
- Stores.push_back(Store);
- StoreAddrs.push_back(Store->getPointerOperand());
- }
- }
- return true;
- }
- }
- return false;
+ VMap[Extract] = SelectorValue;
}
CloningDirector::CloningAction WinEHCloningDirectorBase::handleInstruction(
@@ -838,25 +811,6 @@ CloningDirector::CloningAction WinEHClon
if (LPadMap.isLandingPadSpecificInst(Inst))
return CloningDirector::SkipInstruction;
- if (auto *Load = dyn_cast<LoadInst>(Inst)) {
- // Look for loads of (previously suppressed) landingpad values.
- // The EHPtr load can be mapped to an undef value as it should only be used
- // as an argument to llvm.eh.begincatch, but the selector value needs to be
- // mapped to a constant value of 1. This value will be used to simplify the
- // branching to always flow to the current handler.
- if (LPadMap.mapIfSelectorLoad(Load)) {
- VMap[Inst] = ConstantInt::get(SelectorIDType, 1);
- return CloningDirector::SkipInstruction;
- }
- if (LPadMap.mapIfEHPtrLoad(Load)) {
- VMap[Inst] = UndefValue::get(Int8PtrType);
- return CloningDirector::SkipInstruction;
- }
-
- // Any other loads just get cloned.
- return CloningDirector::CloneInstruction;
- }
-
// Nested landing pads will be cloned as stubs, with just the
// landingpad instruction and an unreachable instruction. When
// all landingpads have been outlined, we'll replace this with the
@@ -926,20 +880,24 @@ WinEHCatchDirector::handleEndCatch(Value
if (ParentBB->isLandingPad() && !LPadMap.isOriginLandingPadBlock(ParentBB))
return CloningDirector::SkipInstruction;
- // If an end catch occurs anywhere else the next instruction should be an
- // unconditional branch instruction that we want to replace with a return
- // to the the address of the branch target.
- const BasicBlock *EndCatchBB = IntrinCall->getParent();
- const TerminatorInst *Terminator = EndCatchBB->getTerminator();
- const BranchInst *Branch = dyn_cast<BranchInst>(Terminator);
- assert(Branch && Branch->isUnconditional());
- assert(std::next(BasicBlock::const_iterator(IntrinCall)) ==
- BasicBlock::const_iterator(Branch));
-
- BasicBlock *ContinueLabel = Branch->getSuccessor(0);
- ReturnInst::Create(NewBB->getContext(), BlockAddress::get(ContinueLabel),
- NewBB);
- ReturnTargets.push_back(ContinueLabel);
+ // If an end catch occurs anywhere else we want to terminate the handler
+ // with a return to the code that follows the endcatch call. If the
+ // next instruction is not an unconditional branch, we need to split the
+ // block to provide a clear target for the return instruction.
+ BasicBlock *ContinueBB;
+ auto Next = std::next(BasicBlock::const_iterator(IntrinCall));
+ const BranchInst *Branch = dyn_cast<BranchInst>(Next);
+ if (!Branch || !Branch->isUnconditional()) {
+ // We're interrupting the cloning process at this location, so the
+ // const_cast we're doing here will not cause a problem.
+ ContinueBB = SplitBlock(const_cast<BasicBlock *>(ParentBB),
+ const_cast<Instruction *>(cast<Instruction>(Next)));
+ } else {
+ ContinueBB = Branch->getSuccessor(0);
+ }
+
+ ReturnInst::Create(NewBB->getContext(), BlockAddress::get(ContinueBB), NewBB);
+ ReturnTargets.push_back(ContinueBB);
// We just added a terminator to the cloned block.
// Tell the caller to stop processing the current basic block so that
@@ -1338,10 +1296,8 @@ CleanupHandler *WinEHPrepare::findCleanu
}
// Look for the bare resume pattern:
- // %exn2 = load i8** %exn.slot
- // %sel2 = load i32* %ehselector.slot
- // %lpad.val1 = insertvalue { i8*, i32 } undef, i8* %exn2, 0
- // %lpad.val2 = insertvalue { i8*, i32 } %lpad.val1, i32 %sel2, 1
+ // %lpad.val1 = insertvalue { i8*, i32 } undef, i8* %exn, 0
+ // %lpad.val2 = insertvalue { i8*, i32 } %lpad.val1, i32 %sel, 1
// resume { i8*, i32 } %lpad.val2
if (auto *Resume = dyn_cast<ResumeInst>(Terminator)) {
InsertValueInst *Insert1 = nullptr;
@@ -1375,62 +1331,53 @@ CleanupHandler *WinEHPrepare::findCleanu
}
BranchInst *Branch = dyn_cast<BranchInst>(Terminator);
- if (Branch) {
- if (Branch->isConditional()) {
- // Look for the selector dispatch.
- // %sel = load i32* %ehselector.slot
- // %2 = call i32 @llvm.eh.typeid.for(i8* bitcast (i8** @_ZTIf to i8*))
- // %matches = icmp eq i32 %sel12, %2
- // br i1 %matches, label %catch14, label %eh.resume
- CmpInst *Compare = dyn_cast<CmpInst>(Branch->getCondition());
- if (!Compare || !Compare->isEquality())
- return createCleanupHandler(CleanupHandlerMap, BB);
- for (BasicBlock::iterator II = BB->getFirstNonPHIOrDbg(),
- IE = BB->end();
- II != IE; ++II) {
- Instruction *Inst = II;
- if (LPadMap && LPadMap->isLandingPadSpecificInst(Inst))
- continue;
- if (Inst == Compare || Inst == Branch)
- continue;
- if (!Inst->hasOneUse() || (Inst->user_back() != Compare))
- return createCleanupHandler(CleanupHandlerMap, BB);
- if (match(Inst, m_Intrinsic<Intrinsic::eh_typeid_for>()))
- continue;
- if (!isa<LoadInst>(Inst))
- return createCleanupHandler(CleanupHandlerMap, BB);
- }
- // The selector dispatch block should always terminate our search.
- assert(BB == EndBB);
- return nullptr;
- } else {
- // Look for empty blocks with unconditional branches.
- for (BasicBlock::iterator II = BB->getFirstNonPHIOrDbg(),
- IE = BB->end();
- II != IE; ++II) {
- Instruction *Inst = II;
- if (LPadMap && LPadMap->isLandingPadSpecificInst(Inst))
- continue;
- if (Inst == Branch)
- continue;
- // This can happen with a catch-all handler.
- if (match(Inst, m_Intrinsic<Intrinsic::eh_begincatch>()))
- return nullptr;
- if (match(Inst, m_Intrinsic<Intrinsic::eh_endcatch>()))
- continue;
- // Anything else makes this interesting cleanup code.
- return createCleanupHandler(CleanupHandlerMap, BB);
- }
- if (BB == EndBB)
- return nullptr;
- // The branch was unconditional.
- BB = Branch->getSuccessor(0);
+ if (Branch && Branch->isConditional()) {
+ // Look for the selector dispatch.
+ // %2 = call i32 @llvm.eh.typeid.for(i8* bitcast (i8** @_ZTIf to i8*))
+ // %matches = icmp eq i32 %sel, %2
+ // br i1 %matches, label %catch14, label %eh.resume
+ CmpInst *Compare = dyn_cast<CmpInst>(Branch->getCondition());
+ if (!Compare || !Compare->isEquality())
+ return createCleanupHandler(CleanupHandlerMap, BB);
+ for (BasicBlock::iterator II = BB->getFirstNonPHIOrDbg(),
+ IE = BB->end();
+ II != IE; ++II) {
+ Instruction *Inst = II;
+ if (LPadMap && LPadMap->isLandingPadSpecificInst(Inst))
+ continue;
+ if (Inst == Compare || Inst == Branch)
+ continue;
+ if (match(Inst, m_Intrinsic<Intrinsic::eh_typeid_for>()))
+ continue;
+ return createCleanupHandler(CleanupHandlerMap, BB);
+ }
+ // The selector dispatch block should always terminate our search.
+ assert(BB == EndBB);
+ return nullptr;
+ }
+
+ // Anything else is either a catch block or interesting cleanup code.
+ for (BasicBlock::iterator II = BB->getFirstNonPHIOrDbg(),
+ IE = BB->end();
+ II != IE; ++II) {
+ Instruction *Inst = II;
+ if (LPadMap && LPadMap->isLandingPadSpecificInst(Inst))
+ continue;
+ // Unconditional branches fall through to this loop.
+ if (Inst == Branch)
continue;
- } // End else of if branch was conditional
- } // End if Branch
+ // If this is a catch block, there is no cleanup code to be found.
+ if (match(Inst, m_Intrinsic<Intrinsic::eh_begincatch>()))
+ return nullptr;
+ // Anything else makes this interesting cleanup code.
+ return createCleanupHandler(CleanupHandlerMap, BB);
+ }
- // Anything else makes this interesting cleanup code.
- return createCleanupHandler(CleanupHandlerMap, BB);
+ // Only unconditional branches in empty blocks should get this far.
+ assert(Branch && Branch->isUnconditional());
+ if (BB == EndBB)
+ return nullptr;
+ BB = Branch->getSuccessor(0);
}
return nullptr;
}
Added: llvm/trunk/test/CodeGen/WinEH/cppeh-multi-catch.ll
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/test/CodeGen/WinEH/cppeh-multi-catch.ll?rev=233824&view=auto
==============================================================================
--- llvm/trunk/test/CodeGen/WinEH/cppeh-multi-catch.ll (added)
+++ llvm/trunk/test/CodeGen/WinEH/cppeh-multi-catch.ll Wed Apr 1 12:21:25 2015
@@ -0,0 +1,229 @@
+; RUN: opt -mtriple=x86_64-pc-windows-msvc -winehprepare -S -o - < %s | FileCheck %s
+
+; This test is based on the following code:
+;
+; void test()
+; {
+; try {
+; may_throw();
+; } catch (int i) {
+; handle_int(i);
+; } catch (long long ll) {
+; handle_long_long(ll);
+; } catch (SomeClass &obj) {
+; handle_obj(&obj);
+; } catch (...) {
+; handle_exception();
+; }
+; }
+;
+; The catch handlers were edited to insert 'ret void' after the endcatch call.
+
+; ModuleID = 'catch-with-type.cpp'
+target datalayout = "e-m:w-i64:64-f80:128-n8:16:32:64-S128"
+target triple = "x86_64-pc-windows-msvc"
+
+%rtti.TypeDescriptor2 = type { i8**, i8*, [3 x i8] }
+%eh.HandlerMapEntry = type { i32, i32 }
+%rtti.TypeDescriptor3 = type { i8**, i8*, [4 x i8] }
+%rtti.TypeDescriptor15 = type { i8**, i8*, [16 x i8] }
+%class.SomeClass = type { i8 }
+
+$"\01??_R0H at 8" = comdat any
+
+$"\01??_R0_J at 8" = comdat any
+
+$"\01??_R0?AVSomeClass@@@8" = comdat any
+
+@"\01??_7type_info@@6B@" = external constant i8*
+@"\01??_R0H at 8" = linkonce_odr global %rtti.TypeDescriptor2 { i8** @"\01??_7type_info@@6B@", i8* null, [3 x i8] c".H\00" }, comdat
+ at __ImageBase = external constant i8
+ at llvm.eh.handlermapentry.H = private unnamed_addr constant %eh.HandlerMapEntry { i32 0, i32 trunc (i64 sub nuw nsw (i64 ptrtoint (%rtti.TypeDescriptor2* @"\01??_R0H at 8" to i64), i64 ptrtoint (i8* @__ImageBase to i64)) to i32) }, section "llvm.metadata"
+@"\01??_R0_J at 8" = linkonce_odr global %rtti.TypeDescriptor3 { i8** @"\01??_7type_info@@6B@", i8* null, [4 x i8] c"._J\00" }, comdat
+ at llvm.eh.handlermapentry._J = private unnamed_addr constant %eh.HandlerMapEntry { i32 0, i32 trunc (i64 sub nuw nsw (i64 ptrtoint (%rtti.TypeDescriptor3* @"\01??_R0_J at 8" to i64), i64 ptrtoint (i8* @__ImageBase to i64)) to i32) }, section "llvm.metadata"
+@"\01??_R0?AVSomeClass@@@8" = linkonce_odr global %rtti.TypeDescriptor15 { i8** @"\01??_7type_info@@6B@", i8* null, [16 x i8] c".?AVSomeClass@@\00" }, comdat
+@"llvm.eh.handlermapentry.reference.?AVSomeClass@@" = private unnamed_addr constant %eh.HandlerMapEntry { i32 8, i32 trunc (i64 sub nuw nsw (i64 ptrtoint (%rtti.TypeDescriptor15* @"\01??_R0?AVSomeClass@@@8" to i64), i64 ptrtoint (i8* @__ImageBase to i64)) to i32) }, section "llvm.metadata"
+
+
+; CHECK: define void @"\01?test@@YAXXZ"() #0 {
+; CHECK: entry:
+; CHECK: [[UNWINDHELP:\%.+]] = alloca i64
+; CHECK: [[OBJ_PTR:\%.+]] = alloca %class.SomeClass*, align 8
+; CHECK: [[LL_PTR:\%.+]] = alloca i64, align 8
+; CHECK: [[I_PTR:\%.+]] = alloca i32, align 4
+; CHECK: call void (...)* @llvm.frameescape(i32* [[I_PTR]], i64* [[LL_PTR]], %class.SomeClass** [[OBJ_PTR]])
+; CHECK: store volatile i64 -2, i64* [[UNWINDHELP]]
+; CHECK: [[TMP:\%.+]] = bitcast i64* [[UNWINDHELP]] to i8*
+; CHECK: call void @llvm.eh.unwindhelp(i8* [[TMP]])
+; CHECK: invoke void @"\01?may_throw@@YAXXZ"()
+; CHECK: to label %invoke.cont unwind label %[[LPAD_LABEL:lpad[0-9]+]]
+
+; Function Attrs: uwtable
+define void @"\01?test@@YAXXZ"() #0 {
+entry:
+ %exn.slot = alloca i8*
+ %ehselector.slot = alloca i32
+ %obj = alloca %class.SomeClass*, align 8
+ %ll = alloca i64, align 8
+ %i = alloca i32, align 4
+ invoke void @"\01?may_throw@@YAXXZ"()
+ to label %invoke.cont unwind label %lpad
+
+invoke.cont: ; preds = %entry
+ br label %try.cont
+
+; CHECK: [[LPAD_LABEL]]:{{[ ]+}}; preds = %entry
+; CHECK: landingpad { i8*, i32 } personality i8* bitcast (i32 (...)* @__CxxFrameHandler3 to i8*)
+; CHECK-NEXT: catch %eh.HandlerMapEntry* @llvm.eh.handlermapentry.H
+; CHECK-NEXT: catch %eh.HandlerMapEntry* @llvm.eh.handlermapentry._J
+; CHECK-NEXT: catch %eh.HandlerMapEntry* @"llvm.eh.handlermapentry.reference.?AVSomeClass@@"
+; CHECK-NEXT: catch i8* null
+; CHECK-NEXT: [[RECOVER:\%.+]] = call i8* (...)* @llvm.eh.actions(i32 1, i8* bitcast (%eh.HandlerMapEntry* @llvm.eh.handlermapentry.H to i8*), i32* %i, i8* (i8*, i8*)* @"\01?test@@YAXXZ.catch", i32 1, i8* bitcast (%eh.HandlerMapEntry* @llvm.eh.handlermapentry._J to i8*), i64* %ll, i8* (i8*, i8*)* @"\01?test@@YAXXZ.catch1", i32 1, i8* bitcast (%eh.HandlerMapEntry* @"llvm.eh.handlermapentry.reference.?AVSomeClass@@" to i8*), %class.SomeClass** %obj, i8* (i8*, i8*)* @"\01?test@@YAXXZ.catch2", i32 1, i8* null, i8* null, i8* (i8*, i8*)* @"\01?test@@YAXXZ.catch3")
+; CHECK-NEXT: indirectbr i8* [[RECOVER]], [label %catch14.split, label %catch10.split, label %catch6.split, label %catch.split]
+
+lpad: ; preds = %entry
+ %0 = landingpad { i8*, i32 } personality i8* bitcast (i32 (...)* @__CxxFrameHandler3 to i8*)
+ catch %eh.HandlerMapEntry* @llvm.eh.handlermapentry.H
+ catch %eh.HandlerMapEntry* @llvm.eh.handlermapentry._J
+ catch %eh.HandlerMapEntry* @"llvm.eh.handlermapentry.reference.?AVSomeClass@@"
+ catch i8* null
+ %1 = extractvalue { i8*, i32 } %0, 0
+ store i8* %1, i8** %exn.slot
+ %2 = extractvalue { i8*, i32 } %0, 1
+ store i32 %2, i32* %ehselector.slot
+ br label %catch.dispatch
+
+; CHECK-NOT: catch.dispatch:
+catch.dispatch: ; preds = %lpad
+ %sel = load i32, i32* %ehselector.slot
+ %3 = call i32 @llvm.eh.typeid.for(i8* bitcast (%eh.HandlerMapEntry* @llvm.eh.handlermapentry.H to i8*)) #3
+ %matches = icmp eq i32 %sel, %3
+ br i1 %matches, label %catch14, label %catch.fallthrough
+
+; CHECK-NOT: catch14:
+; CHECK: catch14.split:
+; CHECK-NEXT: ret void
+catch14: ; preds = %catch.dispatch
+ %exn15 = load i8*, i8** %exn.slot
+ %4 = bitcast i32* %i to i8*
+ call void @llvm.eh.begincatch(i8* %exn15, i8* %4) #3
+ %5 = load i32, i32* %i, align 4
+ call void @"\01?handle_int@@YAXH at Z"(i32 %5)
+ call void @llvm.eh.endcatch() #3
+ ret void
+
+try.cont: ; preds = %invoke.cont
+ ret void
+
+; CHECK-NOT: catch.fallthrough:
+catch.fallthrough: ; preds = %catch.dispatch
+ %6 = call i32 @llvm.eh.typeid.for(i8* bitcast (%eh.HandlerMapEntry* @llvm.eh.handlermapentry._J to i8*)) #3
+ %matches1 = icmp eq i32 %sel, %6
+ br i1 %matches1, label %catch10, label %catch.fallthrough2
+
+; CHECK-NOT: catch10:
+; CHECK: catch10.split:
+; CHECK-NEXT: ret void
+catch10: ; preds = %catch.fallthrough
+ %exn11 = load i8*, i8** %exn.slot
+ %7 = bitcast i64* %ll to i8*
+ call void @llvm.eh.begincatch(i8* %exn11, i8* %7) #3
+ %8 = load i64, i64* %ll, align 8
+ call void @"\01?handle_long_long@@YAX_J at Z"(i64 %8)
+ call void @llvm.eh.endcatch() #3
+ ret void
+
+; CHECK-NOT: catch.fallthrough2:
+catch.fallthrough2: ; preds = %catch.fallthrough
+ %9 = call i32 @llvm.eh.typeid.for(i8* bitcast (%eh.HandlerMapEntry* @"llvm.eh.handlermapentry.reference.?AVSomeClass@@" to i8*)) #3
+ %matches3 = icmp eq i32 %sel, %9
+ br i1 %matches3, label %catch6, label %catch
+
+; CHECK-NOT: catch6:
+; CHECK: catch6.split:
+; CHECK-NEXT: ret void
+catch6: ; preds = %catch.fallthrough2
+ %exn7 = load i8*, i8** %exn.slot
+ %10 = bitcast %class.SomeClass** %obj to i8*
+ call void @llvm.eh.begincatch(i8* %exn7, i8* %10) #3
+ %11 = load %class.SomeClass*, %class.SomeClass** %obj, align 8
+ call void @"\01?handle_obj@@YAXPEAVSomeClass@@@Z"(%class.SomeClass* %11)
+ call void @llvm.eh.endcatch() #3
+ ret void
+
+; CHECK-NOT: catch:
+; CHECK: catch.split:
+; CHECK-NEXT: ret void
+catch: ; preds = %catch.fallthrough2
+ %exn = load i8*, i8** %exn.slot
+ call void @llvm.eh.begincatch(i8* %exn, i8* null) #3
+ call void @"\01?handle_exception@@YAXXZ"() call void @llvm.eh.endcatch() #3
+ ret void
+; CHECK: }
+}
+
+; CHECK-LABEL: define internal i8* @"\01?test@@YAXXZ.catch"(i8*, i8*)
+; CHECK: entry:
+; CHECK: [[RECOVER_I:\%.+]] = call i8* @llvm.framerecover(i8* bitcast (void ()* @"\01?test@@YAXXZ" to i8*), i8* %1, i32 0)
+; CHECK: [[I_PTR:\%.+]] = bitcast i8* [[RECOVER_I]] to i32*
+; CHECK: [[TMP1:\%.+]] = load i32, i32* [[I_PTR]], align 4
+; CHECK: call void @"\01?handle_int@@YAXH at Z"(i32 [[TMP1]])
+; CHECK: ret i8* blockaddress(@"\01?test@@YAXXZ", %catch14.split)
+; CHECK: }
+
+; CHECK-LABEL: define internal i8* @"\01?test@@YAXXZ.catch1"(i8*, i8*)
+; CHECK: entry:
+; CHECK: [[RECOVER_LL:\%.+]] = call i8* @llvm.framerecover(i8* bitcast (void ()* @"\01?test@@YAXXZ" to i8*), i8* %1, i32 1)
+; CHECK: [[LL_PTR:\%.+]] = bitcast i8* [[RECOVER_LL]] to i64*
+; CHECK: [[TMP2:\%.+]] = load i64, i64* [[LL_PTR]], align 8
+; CHECK: call void @"\01?handle_long_long@@YAX_J at Z"(i64 [[TMP2]])
+; CHECK: ret i8* blockaddress(@"\01?test@@YAXXZ", %catch10.split)
+; CHECK: }
+
+; CHECK-LABEL: define internal i8* @"\01?test@@YAXXZ.catch2"(i8*, i8*)
+; CHECK: entry:
+; CHECK: [[RECOVER_OBJ:\%.+]] = call i8* @llvm.framerecover(i8* bitcast (void ()* @"\01?test@@YAXXZ" to i8*), i8* %1, i32 2)
+; CHECK: [[OBJ_PTR:\%.+]] = bitcast i8* [[RECOVER_OBJ]] to %class.SomeClass**
+; CHECK: [[TMP3:\%.+]] = load %class.SomeClass*, %class.SomeClass** [[OBJ_PTR]], align 8
+; CHECK: call void @"\01?handle_obj@@YAXPEAVSomeClass@@@Z"(%class.SomeClass* [[TMP3]])
+; CHECK: ret i8* blockaddress(@"\01?test@@YAXXZ", %catch6.split)
+; CHECK: }
+
+; CHECK-LABEL: define internal i8* @"\01?test@@YAXXZ.catch3"(i8*, i8*)
+; CHECK: entry:
+; CHECK: call void @"\01?handle_exception@@YAXXZ"()
+; CHECK: ret i8* blockaddress(@"\01?test@@YAXXZ", %catch.split)
+; CHECK: }
+
+
+declare void @"\01?may_throw@@YAXXZ"() #1
+
+declare i32 @__CxxFrameHandler3(...)
+
+; Function Attrs: nounwind readnone
+declare i32 @llvm.eh.typeid.for(i8*) #2
+
+; Function Attrs: nounwind
+declare void @llvm.eh.begincatch(i8* nocapture, i8* nocapture) #3
+
+declare void @"\01?handle_exception@@YAXXZ"() #1
+
+; Function Attrs: nounwind
+declare void @llvm.eh.endcatch() #3
+
+declare void @"\01?handle_obj@@YAXPEAVSomeClass@@@Z"(%class.SomeClass*) #1
+
+declare void @"\01?handle_long_long@@YAX_J at Z"(i64) #1
+
+declare void @"\01?handle_int@@YAXH at Z"(i32) #1
+
+attributes #0 = { uwtable "less-precise-fpmad"="false" "no-frame-pointer-elim"="false" "no-infs-fp-math"="false" "no-nans-fp-math"="false" "stack-protector-buffer-size"="8" "unsafe-fp-math"="false" "use-soft-float"="false" }
+attributes #1 = { "less-precise-fpmad"="false" "no-frame-pointer-elim"="false" "no-infs-fp-math"="false" "no-nans-fp-math"="false" "stack-protector-buffer-size"="8" "unsafe-fp-math"="false" "use-soft-float"="false" }
+attributes #2 = { nounwind readnone }
+attributes #3 = { nounwind }
+
+!llvm.module.flags = !{!0}
+!llvm.ident = !{!1}
+
+!0 = !{i32 1, !"PIC Level", i32 2}
+!1 = !{!"clang version 3.7.0 (trunk 233155) (llvm/trunk 233153)"}
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