1 files changed, 8 insertions, 0 deletions

diff --git a/contrib/llvm/lib/ProfileData/Coverage/CoverageMappingWriter.cpp b/contrib/llvm/lib/ProfileData/Coverage/CoverageMappingWriter.cpp
index 6fe93530da21..49e82e481059 100644
--- a/contrib/llvm/lib/ProfileData/Coverage/CoverageMappingWriter.cpp
+++ b/contrib/llvm/lib/ProfileData/Coverage/CoverageMappingWriter.cpp
@@ -116,6 +116,13 @@ static void writeCounter(ArrayRef<CounterExpression> Expressions, Counter C,
 }
 
 void CoverageMappingWriter::write(raw_ostream &OS) {
+  // Check that we don't have any bogus regions.
+  assert(all_of(MappingRegions,
+                [](const CounterMappingRegion &CMR) {
+                  return CMR.startLoc() <= CMR.endLoc();
+                }) &&
+         "Source region does not begin before it ends");
+
   // Sort the regions in an ascending order by the file id and the starting
   // location. Sort by region kinds to ensure stable order for tests.
   std::stable_sort(
@@ -164,6 +171,7 @@ void CoverageMappingWriter::write(raw_ostream &OS) {
     Counter Count = Minimizer.adjust(I->Count);
     switch (I->Kind) {
     case CounterMappingRegion::CodeRegion:
+    case CounterMappingRegion::GapRegion:
       writeCounter(MinExpressions, Count, OS);
       break;
     case CounterMappingRegion::ExpansionRegion: {