[PATCH] D159522: [Clang][C] Fixed a bug where we reject an _Atomic qualified integer in a switch statment

[Guillot Tony via Phabricator via cfe-commits]

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We are currently rejecting an _Atomic qualified integer in a switch statment.
This fixes the issue by doing an Lvalue conversion before trying to match on the type.
Fixes #65557


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D159522

Files:
  clang/lib/Sema/SemaOverload.cpp
  clang/test/Sema/atomic-expr.c


Index: clang/test/Sema/atomic-expr.c
===================================================================
--- clang/test/Sema/atomic-expr.c
+++ clang/test/Sema/atomic-expr.c
@@ -216,3 +216,9 @@
   struct T { int a; };
   (void)(_Atomic struct T)s; // expected-error {{used type 'struct T' where arithmetic or pointer type is required}}
 }
+
+// Test if we can handle an _Atomic qualified integer in a switch statement.
+void func_19(void) {
+  _Atomic int a = 0;
+  switch (a) { }
+}
Index: clang/lib/Sema/SemaOverload.cpp
===================================================================
--- clang/lib/Sema/SemaOverload.cpp
+++ clang/lib/Sema/SemaOverload.cpp
@@ -6302,8 +6302,10 @@
     From = result.get();
   }
 
+  // Try converting the expression to an Lvalue first, to get rid of qualifiers.
+  ExprResult Converted = DefaultLvalueConversion(From);
+  QualType T = Converted.isUsable() ? Converted.get()->getType() : QualType();
   // If the expression already has a matching type, we're golden.
-  QualType T = From->getType();
   if (Converter.match(T))
     return DefaultLvalueConversion(From);
 


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