[clang] [clang][Interp] Fix classifying enum types (PR #104582)

[via cfe-commits]

llvmbot wrote:


<!--LLVM PR SUMMARY COMMENT-->

@llvm/pr-subscribers-clang

Author: Timm Baeder (tbaederr)

<details>
<summary>Changes</summary>

We used to always return PT_IntAP(s) for them.

---
Full diff: https://github.com/llvm/llvm-project/pull/104582.diff


2 Files Affected:

- (modified) clang/lib/AST/Interp/Context.cpp (+3) 
- (modified) clang/test/AST/Interp/enums.cpp (+5) 


``````````diff
diff --git a/clang/lib/AST/Interp/Context.cpp b/clang/lib/AST/Interp/Context.cpp
index 92ac28137fdb45..e9c1fd1b8dc9f9 100644
--- a/clang/lib/AST/Interp/Context.cpp
+++ b/clang/lib/AST/Interp/Context.cpp
@@ -135,6 +135,9 @@ std::optional<PrimType> Context::classify(QualType T) const {
   if (T->isAnyComplexType() || T->isVectorType())
     return std::nullopt;
 
+  if (const auto *ET = T->getAs<EnumType>())
+    return classify(ET->getDecl()->getIntegerType());
+
   if (T->isSignedIntegerOrEnumerationType()) {
     switch (Ctx.getIntWidth(T)) {
     case 64:
diff --git a/clang/test/AST/Interp/enums.cpp b/clang/test/AST/Interp/enums.cpp
index c4db7875451677..459cf3a0c83d54 100644
--- a/clang/test/AST/Interp/enums.cpp
+++ b/clang/test/AST/Interp/enums.cpp
@@ -48,3 +48,8 @@ constexpr EC getB() {
 
 
 static_assert(getB() == EC::B, "");
+
+namespace B {
+  enum E : bool { Zero, One };
+  static_assert((int)(E)2 == 1, "");
+} // namespace B

``````````

</details>


https://github.com/llvm/llvm-project/pull/104582