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-rw-r--r--llvm/unittests/ProfileData/CoverageMappingTest.cpp3
1 files changed, 3 insertions, 0 deletions
diff --git a/llvm/unittests/ProfileData/CoverageMappingTest.cpp b/llvm/unittests/ProfileData/CoverageMappingTest.cpp
index 44b7a13..d1bb87a 100644
--- a/llvm/unittests/ProfileData/CoverageMappingTest.cpp
+++ b/llvm/unittests/ProfileData/CoverageMappingTest.cpp
@@ -201,6 +201,9 @@ struct CoverageMappingTest : ::testing::TestWithParam<std::pair<bool, bool>> {
void readCoverageRegions(const std::string &Coverage,
OutputFunctionCoverageData &Data) {
+ // We will re-use the StringRef in duplicate tests, clear it to avoid
+ // clobber previous ones.
+ Filenames.clear();
Filenames.resize(Files.size() + 1);
for (const auto &E : Files)
Filenames[E.getValue()] = E.getKey().str();