[clang] [Clang] [CodeGen] Perform derived-to-base conversion on explicit object parameter in lambda (PR #89828)

[via cfe-commits]

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@@ -4693,6 +4694,17 @@ LValue CodeGenFunction::EmitLValueForLambdaField(const FieldDecl *Field,
     else
       LambdaLV = MakeAddrLValue(AddrOfExplicitObject,
                                 D->getType().getNonReferenceType());
+
+    // Make sure we have an lvalue to the lambda itself and not a derived class.
+    auto *ThisTy = D->getType().getNonReferenceType()->getAsCXXRecordDecl();
+    auto *LambdaTy = cast<CXXRecordDecl>(Field->getParent());
+    if (ThisTy != LambdaTy) {
+      const CXXCastPath &BasePathArray = getContext().LambdaCastPaths.at(MD);
+      Address Base = GetAddressOfBaseClass(
+          LambdaLV.getAddress(*this), ThisTy, BasePathArray.begin(),
+          BasePathArray.end(), /*NullCheckValue=*/false, SourceLocation());
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Sirraide wrote:

Fixed

https://github.com/llvm/llvm-project/pull/89828