[coverage] skipping code coverage for 'if constexpr' and 'if consteval' (#78033)

`if constexpr` and `if consteval` conditional statements code coverage
should behave more like a preprocesor `#if`-s than normal
ConditionalStmt. This PR should fix that.

---------

Co-authored-by: cor3ntin <corentinjabot@gmail.com>

1 files changed, 8 insertions, 1 deletions

diff --git a/llvm/lib/ProfileData/Coverage/CoverageMapping.cpp b/llvm/lib/ProfileData/Coverage/CoverageMapping.cpp
index eece6a2..d8be7be 100644
--- a/llvm/lib/ProfileData/Coverage/CoverageMapping.cpp
+++ b/llvm/lib/ProfileData/Coverage/CoverageMapping.cpp
@@ -1319,8 +1319,15 @@ LineCoverageStats::LineCoverageStats(
       !StartOfSkippedRegion &&
       ((WrappedSegment && WrappedSegment->HasCount) || (MinRegionCount > 0));
 
-  if (!Mapped)
+  // if there is any starting segment at this line with a counter, it must be
+  // mapped
+  Mapped |= std::any_of(
+      LineSegments.begin(), LineSegments.end(),
+      [](const auto *Seq) { return Seq->IsRegionEntry && Seq->HasCount; });
+
+  if (!Mapped) {
     return;
+  }
 
   // Pick the max count from the non-gap, region entry segments and the
   // wrapped count.