1 files changed, 15 insertions, 0 deletions
diff --git a/llvm/lib/ProfileData/CoverageMappingReader.cpp b/llvm/lib/ProfileData/CoverageMappingReader.cpp
index 8d1508b0370..3eb87e68db8 100644
--- a/llvm/lib/ProfileData/CoverageMappingReader.cpp
+++ b/llvm/lib/ProfileData/CoverageMappingReader.cpp
@@ -15,12 +15,15 @@
 #include "llvm/ProfileData/CoverageMappingReader.h"
 #include "llvm/ADT/DenseSet.h"
 #include "llvm/Object/ObjectFile.h"
+#include "llvm/Support/Debug.h"
 #include "llvm/Support/LEB128.h"
 
 using namespace llvm;
 using namespace coverage;
 using namespace object;
 
+#define DEBUG_TYPE "coverage-mapping"
+
 void CoverageMappingIterator::increment() {
   // Check if all the records were read or if an error occurred while reading
   // the next record.
@@ -198,6 +201,18 @@ std::error_code RawCoverageMappingReader::readMappingRegionsSubArray(
       ColumnStart = 1;
       ColumnEnd = std::numeric_limits<unsigned>::max();
     }
+
+    DEBUG({
+      dbgs() << "Counter in file " << InferredFileID << " " << LineStart << ":"
+             << ColumnStart << " -> " << (LineStart + NumLines) << ":"
+             << ColumnEnd << ", ";
+      if (Kind == CounterMappingRegion::ExpansionRegion)
+        dbgs() << "Expands to file " << ExpandedFileID;
+      else
+        CounterMappingContext(Expressions).dump(C, dbgs());
+      dbgs() << "\n";
+    });
+
     MappingRegions.push_back(CounterMappingRegion(
         C, InferredFileID, LineStart, ColumnStart, LineStart + NumLines,
         ColumnEnd, HasCodeBefore, Kind));