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[WinEH] Call llvm.stackrestore in __except blocks

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We have to do this manually, the runtime only sets up ebp. Fixes a crash
when returning after catching an exception.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@239451 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Reid Kleckner 2015-06-10 01:34:54 +00:00
parent 6d7e69b227
commit 839f83e1e3
2 changed files with 23 additions and 1 deletions
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20
lib/Target/X86/X86WinEHState.cpp
View File

@ -263,7 +263,6 @@ void WinEHStatePass::emitExceptionRegistrationRecord(Function *F) {
if (Personality == EHPersonality::MSVC_CXX) {
RegNodeTy = getCXXEHRegistrationType();
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), {});
@ -490,6 +489,7 @@ void WinEHStatePass::addSEHStateStores(Function &F, MachineModuleInfo &MMI) {
// 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)) {
@ -517,11 +517,29 @@ void WinEHStatePass::addSEHStateStores(Function &F, MachineModuleInfo &MMI) {
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());
}
}
}
insertStateNumberStore(RegNode, II, State);
}
}
}
// Insert llvm.stackrestore into each __except block.
Function *StackRestore =
Intrinsic::getDeclaration(TheModule, Intrinsic::stackrestore);
for (BasicBlock *ExceptBB : ExceptBlocks) {
IRBuilder<> Builder(ExceptBB->begin());
Value *SP =
Builder.CreateLoad(Builder.CreateStructGEP(RegNodeTy, RegNode, 0));
Builder.CreateCall(StackRestore, {SP});
}
}
/// Rewrite llvm.eh.exceptioncode and llvm.eh.exceptioninfo to memory loads in

4
test/CodeGen/X86/seh-safe-div-win32.ll
View File

@ -77,11 +77,15 @@ __try.cont:
; CHECK: [[handler0:Ltmp[0-9]+]]: # Block address taken
; CHECK: # %handler0
; Restore SP
; CHECK: movl {{.*}}(%ebp), %esp
; CHECK: calll _puts
; CHECK: jmp [[cont_bb]]
; CHECK: [[handler1:Ltmp[0-9]+]]: # Block address taken
; CHECK: # %handler1
; Restore SP
; CHECK: movl {{.*}}(%ebp), %esp
; CHECK: calll _puts
; CHECK: jmp [[cont_bb]]