1 files changed, 39 insertions, 28 deletions
diff --git a/pkg/cover/report.go b/pkg/cover/report.go
index f147eedd0..056021739 100644
--- a/pkg/cover/report.go
+++ b/pkg/cover/report.go
@@ -105,34 +105,9 @@ func (rg *ReportGenerator) prepareFileMap(progs []Prog, force, debug bool) (file
 			}
 		}
 	}
-	matchedPC := false
-	for _, frame := range rg.Frames {
-		f := fileByFrame(files, frame)
-		ln := f.lines[frame.StartLine]
-		coveredBy := pcToProgs[frame.PC]
-		if len(coveredBy) == 0 {
-			f.uncovered = append(f.uncovered, frame.Range)
-			continue
-		}
-		// Covered frame.
-		f.covered = append(f.covered, frame.Range)
-		matchedPC = true
-		if ln.progCount == nil {
-			ln.progCount = make(map[int]bool)
-			ln.pcProgCount = make(map[uint64]int)
-			ln.progIndex = -1
-		}
-		for progIndex := range coveredBy {
-			ln.progCount[progIndex] = true
-			if ln.progIndex == -1 || len(progs[progIndex].Data) < len(progs[ln.progIndex].Data) {
-				ln.progIndex = progIndex
-			}
-			ln.pcProgCount[frame.PC]++
-		}
-		f.lines[frame.StartLine] = ln
-	}
-	if !matchedPC {
-		return nil, fmt.Errorf("coverage doesn't match any coverage callbacks")
+	err := rg.frame2line(files, pcToProgs, progs)
+	if err != nil {
+		return nil, err
 	}
 	// If the backend provided coverage callback locations for the binaries, use them to
 	// verify data returned by kcov.
@@ -168,6 +143,42 @@ func (rg *ReportGenerator) prepareFileMap(progs []Prog, force, debug bool) (file
 	return files, nil
 }
 
+func (rg *ReportGenerator) frame2line(files fileMap, pcToProgs map[uint64]map[int]bool, progs []Prog) error {
+	matchedPC := false
+	for _, frame := range rg.Frames {
+		if frame.StartLine < 0 {
+			continue
+		}
+		f := fileByFrame(files, frame)
+		ln := f.lines[frame.StartLine]
+		coveredBy := pcToProgs[frame.PC]
+		if len(coveredBy) == 0 {
+			f.uncovered = append(f.uncovered, frame.Range)
+			continue
+		}
+		// Covered frame.
+		f.covered = append(f.covered, frame.Range)
+		matchedPC = true
+		if ln.progCount == nil {
+			ln.progCount = make(map[int]bool)
+			ln.pcProgCount = make(map[uint64]int)
+			ln.progIndex = -1
+		}
+		for progIndex := range coveredBy {
+			ln.progCount[progIndex] = true
+			if ln.progIndex == -1 || len(progs[progIndex].Data) < len(progs[ln.progIndex].Data) {
+				ln.progIndex = progIndex
+			}
+			ln.pcProgCount[frame.PC]++
+		}
+		f.lines[frame.StartLine] = ln
+	}
+	if !matchedPC {
+		return fmt.Errorf("coverage doesn't match any coverage callbacks")
+	}
+	return nil
+}
+
 func contains(pcs []uint64, pc uint64) bool {
 	idx := sort.Search(len(pcs), func(i int) bool { return pcs[i] >= pc })
 	return idx < len(pcs) && pcs[idx] == pc