[PATCH] D58569: [libclang] Avoid crashing when getting layout info of an undeduced type.

Anastasia Stulova via Phabricator via cfe-commits cfe-commits at lists.llvm.org
Mon Feb 25 09:59:03 PST 2019

Anastasia added inline comments.

Comment at: clang/tools/c-index-test/c-index-test.c:1695
+    CXType RT = clang_getResultType(T);
+    if (RT.kind != CXType_Invalid)
+      PrintSingleTypeSize(RT, " [resulttype=%s] [resulttypekind=%s]",
emilio wrote:
> Anastasia wrote:
> > Should it not return undeduced error in the other case?
> I'm not sure what you mean, can you clarify?
> The undeduced error is only returned when you try to access the `Auto` type which is the return value, not the function type, which has a known layout.
> So in the error case, `T` here is the `auto Tie(void*) const;` type, and `RT` is the undeduced `auto` type, which is what crashed.
> We had no way to exercise this in `c-index-test`, so I changed it to exercise this codepath too. I can add a `CHECK` for the error code if you want.
Yep, error check would be good since it's covers better changes in your patch.

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