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[WinEH] Emit .safeseh directives for all 32-bit exception handlers

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Use a "safeseh" string attribute to do this. You would think we chould
just accumulate the set of personalities like we do on dwarf, but this
fails to account for the LSDA-loading thunks we use for
__CxxFrameHandler3. Each of those needs to make it into .sxdata as well.
The string attribute seemed like the most straightforward approach.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@239448 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Reid Kleckner
2015-06-10 01:02:30 +00:00
parent a8c0a9b042
commit c8e72e9126
5 changed files with 29 additions and 6 deletions
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11
lib/Target/X86/X86WinEHState.cpp
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@@ -60,7 +60,7 @@ public:
private:
void emitExceptionRegistrationRecord(Function *F);
void linkExceptionRegistration(IRBuilder<> &Builder, Value *Handler);
void linkExceptionRegistration(IRBuilder<> &Builder, Function *Handler);
void unlinkExceptionRegistration(IRBuilder<> &Builder);
void addCXXStateStores(Function &F, MachineModuleInfo &MMI);
void addSEHStateStores(Function &F, MachineModuleInfo &MMI);
@@ -365,11 +365,14 @@ Function *WinEHStatePass::generateLSDAInEAXThunk(Function *ParentFunc) {
}
void WinEHStatePass::linkExceptionRegistration(IRBuilder<> &Builder,
Value *Handler) {
Function *Handler) {
// Emit the .safeseh directive for this function.
Handler->addFnAttr("safeseh");
Type *LinkTy = getEHLinkRegistrationType();
// Handler = Handler
Handler = Builder.CreateBitCast(Handler, Builder.getInt8PtrTy());
Builder.CreateStore(Handler, Builder.CreateStructGEP(LinkTy, Link, 1));
Value *HandlerI8 = Builder.CreateBitCast(Handler, Builder.getInt8PtrTy());
Builder.CreateStore(HandlerI8, Builder.CreateStructGEP(LinkTy, Link, 1));
// Next = [fs:00]
Constant *FSZero =
Constant::getNullValue(LinkTy->getPointerTo()->getPointerTo(257));