d917027334
When processing coverage generated from branch coverage mode, some functions can reach findMainViewFileID with an empty CountedRegions list. In that case the current logic still proceeds to infer the main view file, even though there is no regular counted region available to do so. Return std::nullopt early when CountedRegions is empty. This was observed when reproducing issue #189169 with: cargo llvm-cov --lib --branch The issue appears related to branch-only coverage information being recorded separately in CountedBranchRegions, while findMainViewFileID currently only consults CountedRegions. This patch is a defensive fix for the empty-region case; further investigation may still be needed to determine whether branch regions should participate in main view file selection. Co-authored-by: Zile Xiong <xiongzile99@gmail.com>
The LLVM Compiler Infrastructure
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