[WinEH] Don't emit state stores or EH thunks for available_externally functions
The exception handler thunk needs to reference the LSDA of the parent
function, which won't be emitted if it's available_externally.
Fixes PR35736. ThinLTO ends up producing available_externally functions
that use _CxxFrameHandler3.
llvm-svn: 321532
diff --git a/llvm/lib/Target/X86/X86WinEHState.cpp b/llvm/lib/Target/X86/X86WinEHState.cpp
index 0472a85..6d6dedc 100644
--- a/llvm/lib/Target/X86/X86WinEHState.cpp
+++ b/llvm/lib/Target/X86/X86WinEHState.cpp
@@ -149,6 +149,12 @@
}
bool WinEHStatePass::runOnFunction(Function &F) {
+ // Don't insert state stores or exception handler thunks for
+ // available_externally functions. The handler needs to reference the LSDA,
+ // which will not be emitted in this case.
+ if (F.hasAvailableExternallyLinkage())
+ return false;
+
// Check the personality. Do nothing if this personality doesn't use funclets.
if (!F.hasPersonalityFn())
return false;