/
go-cover.go
276 lines (256 loc) · 6.31 KB
/
go-cover.go
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// Copyright 2018 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package runtime
import (
"bufio"
"fmt"
"io"
"log"
"os"
"regexp"
"strconv"
"strings"
"sync/atomic"
"testing"
"gopkg.in/errgo.v2/fmt/errors"
)
// mergeCoverProfile merges the coverage information in f into
// cover. It assumes that the coverage information in f is
// always produced from the same binary for every call.
func mergeCoverProfile(cover *testing.Cover, r io.Reader) error {
scanner, err := newProfileScanner(r)
if err != nil {
return errors.Wrap(err)
}
if scanner.Mode() != testing.CoverMode() {
return errors.Newf("unexpected coverage mode in subcommand")
}
if cover.Mode == "" {
cover.Mode = scanner.Mode()
}
isCount := cover.Mode == "count"
if cover.Counters == nil {
cover.Counters = make(map[string][]uint32)
cover.Blocks = make(map[string][]testing.CoverBlock)
}
// Note that we rely on the fact that the coverage is written
// out file-by-file, with all blocks for a file in sequence.
var (
filename string
blockId uint32
counters []uint32
blocks []testing.CoverBlock
)
flush := func() {
if len(counters) > 0 {
cover.Counters[filename] = counters
cover.Blocks[filename] = blocks
}
}
for scanner.Scan() {
block := scanner.Block()
if scanner.Filename() != filename {
flush()
filename = scanner.Filename()
counters = cover.Counters[filename]
blocks = cover.Blocks[filename]
blockId = 0
} else {
blockId++
}
if int(blockId) >= len(counters) {
counters = append(counters, block.Count)
blocks = append(blocks, block.CoverBlock)
continue
}
// TODO check that block.CoverBlock == blocks[blockId] ?
if isCount {
counters[blockId] += block.Count
} else {
counters[blockId] |= block.Count
}
}
flush()
if scanner.Err() != nil {
return errors.Notef(err, nil, "error scanning profile")
}
return nil
}
var (
coverChan chan *os.File
coverDone chan testing.Cover
)
func goCoverProfileMerge() {
if coverChan != nil {
panic("RunMain called twice!")
}
coverChan = make(chan *os.File)
coverDone = make(chan testing.Cover)
go mergeCoverProfiles()
}
func mergeCoverProfiles() {
var cover testing.Cover
for f := range coverChan {
if err := mergeCoverProfile(&cover, f); err != nil {
log.Printf("cannot merge coverage profile from %v: %v", f.Name(), err)
}
f.Close()
os.Remove(f.Name())
}
coverDone <- cover
}
func finalizeCoverProfile() error {
cprof := coverProfile()
if cprof == "" {
return nil
}
f, err := os.Open(cprof)
if err != nil {
return errors.Notef(err, nil, "cannot open existing cover profile")
}
coverChan <- f
close(coverChan)
cover := <-coverDone
f, err = os.Create(cprof)
if err != nil {
return errors.Notef(err, nil, "cannot create cover profile")
}
defer f.Close()
w := bufio.NewWriter(f)
if err := writeCoverProfile1(w, cover); err != nil {
return errors.Wrap(err)
}
if err := w.Flush(); err != nil {
return errors.Wrap(err)
}
if err := f.Close(); err != nil {
return errors.Wrap(err)
}
return nil
}
func writeCoverProfile1(w io.Writer, cover testing.Cover) error {
fmt.Fprintf(w, "mode: %s\n", cover.Mode)
var active, total int64
var count uint32
for name, counts := range cover.Counters {
blocks := cover.Blocks[name]
for i := range counts {
stmts := int64(blocks[i].Stmts)
total += stmts
count = atomic.LoadUint32(&counts[i]) // For -mode=atomic.
if count > 0 {
active += stmts
}
_, err := fmt.Fprintf(w, "%s:%d.%d,%d.%d %d %d\n", name,
blocks[i].Line0, blocks[i].Col0,
blocks[i].Line1, blocks[i].Col1,
stmts,
count,
)
if err != nil {
return errors.Wrap(err)
}
}
}
if total == 0 {
total = 1
}
fmt.Printf("total coverage: %.1f%% of statements%s\n", 100*float64(active)/float64(total), cover.CoveredPackages)
return nil
}
type profileScanner struct {
mode string
err error
scanner *bufio.Scanner
filename string
block coverBlock
}
type coverBlock struct {
testing.CoverBlock
Count uint32
}
var profileLineRe = regexp.MustCompile(`^(.+):([0-9]+)\.([0-9]+),([0-9]+)\.([0-9]+) ([0-9]+) ([0-9]+)$`)
func toInt(s string) int {
i, err := strconv.Atoi(s)
if err != nil {
panic(err)
}
return i
}
func newProfileScanner(r io.Reader) (*profileScanner, error) {
s := &profileScanner{
scanner: bufio.NewScanner(r),
}
// First line is "mode: foo", where foo is "set", "count", or "atomic".
// Rest of file is in the format
// encoding/base64/base64.go:34.44,37.40 3 1
// where the fields are: name.go:line.column,line.column numberOfStatements count
if !s.scanner.Scan() {
return nil, errors.Newf("no lines found in profile: %v", s.Err())
}
line := s.scanner.Text()
mode := strings.TrimPrefix(line, "mode: ")
if len(mode) == len(line) {
return nil, fmt.Errorf("bad mode line %q", line)
}
s.mode = mode
return s, nil
}
// Mode returns the profile's coverage mode (one of "atomic", "count:
// or "set").
func (s *profileScanner) Mode() string {
return s.mode
}
// Err returns any error encountered when scanning a profile.
func (s *profileScanner) Err() error {
if s.err == io.EOF {
return nil
}
return s.err
}
// Block returns the most recently scanned profile block, or the zero
// block if Scan has not been called or has returned false.
func (s *profileScanner) Block() coverBlock {
if s.err == nil {
return s.block
}
return coverBlock{}
}
// Filename returns the filename of the most recently scanned profile
// block, or the empty string if Scan has not been called or has
// returned false.
func (s *profileScanner) Filename() string {
if s.err == nil {
return s.filename
}
return ""
}
// Scan scans the next line in a coverage profile and reports whether
// a line was found.
func (s *profileScanner) Scan() bool {
if s.err != nil {
return false
}
if !s.scanner.Scan() {
s.err = io.EOF
return false
}
m := profileLineRe.FindStringSubmatch(s.scanner.Text())
if m == nil {
s.err = errors.Newf("line %q doesn't match expected format %v", m, profileLineRe)
return false
}
s.filename = m[1]
s.block = coverBlock{
CoverBlock: testing.CoverBlock{
Line0: uint32(toInt(m[2])),
Col0: uint16(toInt(m[3])),
Line1: uint32(toInt(m[4])),
Col1: uint16(toInt(m[5])),
Stmts: uint16(toInt(m[6])),
},
Count: uint32(toInt(m[7])),
}
return true
}