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// Copyright 2024 syzkaller project authors. All rights reserved.
// Use of this source code is governed by Apache 2 LICENSE that can be found in the LICENSE file.
package cover
import (
"context"
"fmt"
"html"
"strings"
"github.com/google/syzkaller/pkg/coveragedb"
"github.com/google/syzkaller/pkg/covermerger"
)
type lineRender func(string, int, *covermerger.MergeResult, *CoverageRenderConfig) string
type CoverageRenderConfig struct {
RendLine lineRender
ShowLineCoverage bool
ShowLineNumbers bool
ShowLineSourceExplanation bool
}
func DefaultTextRenderConfig() *CoverageRenderConfig {
return &CoverageRenderConfig{
RendLine: RendTextLine,
ShowLineCoverage: true,
ShowLineNumbers: true,
ShowLineSourceExplanation: false,
}
}
func DefaultHTMLRenderConfig() *CoverageRenderConfig {
return &CoverageRenderConfig{
RendLine: RendHTMLLine,
ShowLineCoverage: true,
ShowLineNumbers: true,
ShowLineSourceExplanation: false,
}
}
func RendFileCoverage(repo, forCommit, filePath string, fileProvider covermerger.FileVersProvider,
mr *covermerger.MergeResult, renderConfig *CoverageRenderConfig) (string, error) {
repoCommit := covermerger.RepoCommit{Repo: repo, Commit: forCommit}
files, err := fileProvider.GetFileVersions(filePath, repoCommit)
if err != nil {
return "", fmt.Errorf("failed to GetFileVersions: %w", err)
}
return rendResult(files[repoCommit], mr, renderConfig), nil
}
func GetMergeResult(c context.Context, ns, repo, forCommit, sourceCommit, filePath string,
proxy covermerger.FuncProxyURI, tp coveragedb.TimePeriod) (*covermerger.MergeResult, error) {
config := &covermerger.Config{
Jobs: 1,
Base: covermerger.RepoCommit{
Repo: repo,
Commit: forCommit,
},
FileVersProvider: covermerger.MakeWebGit(proxy),
}
fromDate, toDate := tp.DatesFromTo()
dbReader := covermerger.MakeBQCSVReader()
if err := dbReader.InitNsRecords(c,
ns,
filePath,
sourceCommit,
fromDate,
toDate,
); err != nil {
return nil, fmt.Errorf("failed to dbReader.InitNsRecords: %w", err)
}
defer dbReader.Close()
csvReader, err := dbReader.Reader()
if err != nil {
return nil, fmt.Errorf("failed to dbReader.Reader: %w", err)
}
ch := make(chan *covermerger.FileMergeResult, 1)
if err := covermerger.MergeCSVData(c, config, csvReader, ch); err != nil {
return nil, fmt.Errorf("error merging coverage: %w", err)
}
var mr *covermerger.MergeResult
select {
case fmr := <-ch:
if fmr != nil {
mr = fmr.MergeResult
}
default:
}
if mr != nil {
return nil, fmt.Errorf("no merge result for file %s", filePath)
}
return mr, nil
}
func rendResult(content string, coverage *covermerger.MergeResult, renderConfig *CoverageRenderConfig) string {
if coverage == nil {
coverage = &covermerger.MergeResult{
HitCounts: map[int]int64{},
LineDetails: map[int][]*covermerger.FileRecord{},
}
}
srcLines := strings.Split(content, "\n")
var resLines []string
for i, srcLine := range srcLines {
resLines = append(resLines, renderConfig.RendLine(srcLine, i+1, coverage, renderConfig))
}
return strings.Join(resLines, "\n")
}
func RendTextLine(code string, line int, coverage *covermerger.MergeResult, config *CoverageRenderConfig) string {
res := ""
if config.ShowLineSourceExplanation {
explanation := ""
lineDetails, exist := coverage.LineDetails[line]
if exist {
explanation = fmt.Sprintf("(%d)%s ", len(lineDetails), mainSignalSource(lineDetails))
}
res += fmt.Sprintf("%50s", explanation)
}
covered, instrumented := coverage.HitCounts[line]
if config.ShowLineCoverage {
covStr := fmt.Sprintf("%6d", covered)
if !instrumented {
covStr = strings.Repeat(" ", 6)
}
res += fmt.Sprintf("%s ", covStr)
}
if config.ShowLineNumbers {
res += fmt.Sprintf("%6d ", line)
}
res += code
return res
}
func RendHTMLLine(code string, line int, coverage *covermerger.MergeResult, config *CoverageRenderConfig) string {
textLine := RendTextLine(code, line, coverage, config)
return `<pre style="margin: 0">` + html.EscapeString(textLine) + "</pre>"
}
func mainSignalSource(sources []*covermerger.FileRecord) string {
res := ""
prevMax := -1
for _, source := range sources {
if source.HitCount > prevMax {
prevMax = source.HitCount
res = fmt.Sprintf("%s:%d", source.Commit, source.StartLine)
}
}
return res
}
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