r332491 - [Modules] Do not diagnose missing import in recovery mode if there isn't a decl to lookup

[Bruno Cardoso Lopes via cfe-commits]

Author: bruno
Date: Wed May 16 10:00:24 2018
New Revision: 332491

URL: http://llvm.org/viewvc/llvm-project?rev=332491&view=rev
Log:
[Modules] Do not diagnose missing import in recovery mode if there isn't a decl to lookup

Clang often tries to create implicit module import for error recovery,
which does a great job helping out with diagnostics. However, sometimes
clang does not have enough information given that it's using an invalid
context to move on. Be more strict in those cases to avoid crashes.

We hit crash on invalids because of this but unfortunately there are no
testcases and I couldn't manage to create one. The crashtrace however
indicates pretty clear why it's happening.

rdar://problem/39313933

Modified:
    cfe/trunk/lib/Sema/SemaType.cpp

Modified: cfe/trunk/lib/Sema/SemaType.cpp
URL: http://llvm.org/viewvc/llvm-project/cfe/trunk/lib/Sema/SemaType.cpp?rev=332491&r1=332490&r2=332491&view=diff
==============================================================================
--- cfe/trunk/lib/Sema/SemaType.cpp (original)
+++ cfe/trunk/lib/Sema/SemaType.cpp Wed May 16 10:00:24 2018
@@ -7613,7 +7613,7 @@ bool Sema::RequireCompleteTypeImpl(Sourc
       // If the user is going to see an error here, recover by making the
       // definition visible.
       bool TreatAsComplete = Diagnoser && !isSFINAEContext();
-      if (Diagnoser)
+      if (Diagnoser && SuggestedDef)
         diagnoseMissingImport(Loc, SuggestedDef, MissingImportKind::Definition,
                               /*Recover*/TreatAsComplete);
       return !TreatAsComplete;