[coroutines] Wrap the body of the coroutine in try-catch
Summary:
If unhandled_exception member function is present in the coroutine promise,
wrap the body of the coroutine in:
```
try {
body
} catch(...) { promise.unhandled_exception(); }
```
Reviewers: EricWF, rnk, rsmith
Reviewed By: rsmith
Subscribers: cfe-commits
Differential Revision: https://reviews.llvm.org/D31692
llvm-svn: 303583
diff --git a/clang/lib/Sema/SemaCoroutine.cpp b/clang/lib/Sema/SemaCoroutine.cpp
index be89cd1..857dcda 100644
--- a/clang/lib/Sema/SemaCoroutine.cpp
+++ b/clang/lib/Sema/SemaCoroutine.cpp
@@ -1043,6 +1043,15 @@
if (UnhandledException.isInvalid())
return false;
+ // Since the body of the coroutine will be wrapped in try-catch, it will
+ // be incompatible with SEH __try if present in a function.
+ if (!S.getLangOpts().Borland && Fn.FirstSEHTryLoc.isValid()) {
+ S.Diag(Fn.FirstSEHTryLoc, diag::err_seh_in_a_coroutine_with_cxx_exceptions);
+ S.Diag(Fn.FirstCoroutineStmtLoc, diag::note_declared_coroutine_here)
+ << Fn.getFirstCoroutineStmtKeyword();
+ return false;
+ }
+
this->OnException = UnhandledException.get();
return true;
}