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|
// gocovmerge takes the results from multiple `go test -coverprofile` runs and
// merges them into one profile
package main
import (
"flag"
"fmt"
"io"
"log"
"os"
"sort"
"golang.org/x/tools/cover"
)
func mergeProfiles(p *cover.Profile, merge *cover.Profile) {
if p.Mode != merge.Mode {
log.Fatalf("cannot merge profiles with different modes")
}
// Since the blocks are sorted, we can keep track of where the last block
// was inserted and only look at the blocks after that as targets for merge
startIndex := 0
for _, b := range merge.Blocks {
startIndex = mergeProfileBlock(p, b, startIndex)
}
}
func mergeProfileBlock(p *cover.Profile, pb cover.ProfileBlock, startIndex int) int {
sortFunc := func(i int) bool {
pi := p.Blocks[i+startIndex]
return pi.StartLine >= pb.StartLine && (pi.StartLine != pb.StartLine || pi.StartCol >= pb.StartCol)
}
i := 0
if sortFunc(i) != true {
i = sort.Search(len(p.Blocks)-startIndex, sortFunc)
}
i += startIndex
if i < len(p.Blocks) && p.Blocks[i].StartLine == pb.StartLine && p.Blocks[i].StartCol == pb.StartCol {
if p.Blocks[i].EndLine != pb.EndLine || p.Blocks[i].EndCol != pb.EndCol {
log.Fatalf("OVERLAP MERGE: %v %v %v", p.FileName, p.Blocks[i], pb)
}
switch p.Mode {
case "set":
p.Blocks[i].Count |= pb.Count
case "count", "atomic":
p.Blocks[i].Count += pb.Count
default:
log.Fatalf("unsupported covermode: '%s'", p.Mode)
}
} else {
if i > 0 {
pa := p.Blocks[i-1]
if pa.EndLine >= pb.EndLine && (pa.EndLine != pb.EndLine || pa.EndCol > pb.EndCol) {
log.Fatalf("OVERLAP BEFORE: %v %v %v", p.FileName, pa, pb)
}
}
if i < len(p.Blocks)-1 {
pa := p.Blocks[i+1]
if pa.StartLine <= pb.StartLine && (pa.StartLine != pb.StartLine || pa.StartCol < pb.StartCol) {
log.Fatalf("OVERLAP AFTER: %v %v %v", p.FileName, pa, pb)
}
}
p.Blocks = append(p.Blocks, cover.ProfileBlock{})
copy(p.Blocks[i+1:], p.Blocks[i:])
p.Blocks[i] = pb
}
return i + 1
}
func addProfile(profiles []*cover.Profile, p *cover.Profile) []*cover.Profile {
i := sort.Search(len(profiles), func(i int) bool { return profiles[i].FileName >= p.FileName })
if i < len(profiles) && profiles[i].FileName == p.FileName {
mergeProfiles(profiles[i], p)
} else {
profiles = append(profiles, nil)
copy(profiles[i+1:], profiles[i:])
profiles[i] = p
}
return profiles
}
func dumpProfiles(profiles []*cover.Profile, out io.Writer) {
if len(profiles) == 0 {
return
}
fmt.Fprintf(out, "mode: %s\n", profiles[0].Mode)
for _, p := range profiles {
for _, b := range p.Blocks {
fmt.Fprintf(out, "%s:%d.%d,%d.%d %d %d\n", p.FileName, b.StartLine, b.StartCol, b.EndLine, b.EndCol, b.NumStmt, b.Count)
}
}
}
func main() {
flag.Parse()
var merged []*cover.Profile
for _, file := range flag.Args() {
profiles, err := cover.ParseProfiles(file)
if err != nil {
log.Fatalf("failed to parse profiles: %v", err)
}
for _, p := range profiles {
merged = addProfile(merged, p)
}
}
dumpProfiles(merged, os.Stdout)
}
|
