func main() {
flag.Usage = func() {
fmt.Fprintf(os.Stderr, "Usage of %s\n", os.Args[0])
flag.PrintDefaults()
fmt.Fprintf(os.Stderr, modifiedUsage)
}
flag.Parse()
if *cpuprofile != "" {
f, err := os.Create(*cpuprofile)
if err != nil {
log.Fatal(err)
}
if err := pprof.StartCPUProfile(f); err != nil {
log.Fatal(err)
}
defer pprof.StopCPUProfile()
}
filename, offset, err := parsePos(*pos)
if err != nil {
fmt.Println(err)
os.Exit(1)
}
ctx := &build.Default
if *modified {
overlay, err := buildutil.ParseOverlayArchive(os.Stdin)
if err != nil {
log.Fatalln("invalid archive:", err)
}
ctx = buildutil.OverlayContext(ctx, overlay)
}
d, err := Run(ctx, filename, offset)
if err != nil {
fmt.Println(err)
os.Exit(1)
}
if *jsonOutput {
json.NewEncoder(os.Stdout).Encode(d)
} else {
fmt.Println(d.String())
}
}
func TestOverlay(t *testing.T) {
ctx := &build.Default
ov := map[string][]byte{
"/somewhere/a.go": []byte("file contents"),
}
names := []string{"/somewhere/a.go", "/somewhere//a.go"}
ctx = buildutil.OverlayContext(ctx, ov)
for _, name := range names {
f, err := buildutil.OpenFile(ctx, name)
if err != nil {
t.Errorf("unexpected error %v", err)
}
b, err := ioutil.ReadAll(f)
if err != nil {
t.Errorf("unexpected error %v", err)
}
if got, expected := string(b), string(ov["/somewhere/a.go"]); got != expected {
t.Errorf("read %q, expected %q", got, expected)
}
}
}
func main() {
log.SetPrefix("guru: ")
log.SetFlags(0)
// Don't print full help unless -help was requested.
// Just gently remind users that it's there.
flag.Usage = func() { fmt.Fprint(os.Stderr, useHelp) }
flag.CommandLine.Init(os.Args[0], flag.ContinueOnError) // hack
if err := flag.CommandLine.Parse(os.Args[1:]); err != nil {
// (err has already been printed)
if err == flag.ErrHelp {
printHelp()
}
os.Exit(2)
}
args := flag.Args()
if len(args) != 2 {
flag.Usage()
os.Exit(2)
}
mode, posn := args[0], args[1]
if mode == "help" {
printHelp()
os.Exit(2)
}
// Set up points-to analysis log file.
var ptalog io.Writer
if *ptalogFlag != "" {
if f, err := os.Create(*ptalogFlag); err != nil {
log.Fatalf("Failed to create PTA log file: %s", err)
} else {
buf := bufio.NewWriter(f)
ptalog = buf
defer func() {
if err := buf.Flush(); err != nil {
log.Printf("flush: %s", err)
}
if err := f.Close(); err != nil {
log.Printf("close: %s", err)
}
}()
}
}
// Profiling support.
if *cpuprofileFlag != "" {
f, err := os.Create(*cpuprofileFlag)
if err != nil {
log.Fatal(err)
}
pprof.StartCPUProfile(f)
defer pprof.StopCPUProfile()
}
ctxt := &build.Default
// If there were modified files,
// read them from the standard input and
// overlay them on the build context.
if *modifiedFlag {
modified, err := buildutil.ParseOverlayArchive(os.Stdin)
if err != nil {
log.Fatal(err)
}
// All I/O done by guru needs to consult the modified map.
// The ReadFile done by referrers does,
// but the loader's cgo preprocessing currently does not.
if len(modified) > 0 {
ctxt = buildutil.OverlayContext(ctxt, modified)
}
}
var outputMu sync.Mutex
output := func(fset *token.FileSet, qr QueryResult) {
outputMu.Lock()
defer outputMu.Unlock()
if *jsonFlag {
// JSON output
fmt.Printf("%s\n", qr.JSON(fset))
} else {
// plain output
printf := func(pos interface{}, format string, args ...interface{}) {
fprintf(os.Stdout, fset, pos, format, args...)
}
qr.PrintPlain(printf)
}
}
// Avoid corner case of split("").
var scope []string
if *scopeFlag != "" {
scope = strings.Split(*scopeFlag, ",")
}
// Ask the guru.
query := Query{
Pos: posn,
Build: ctxt,
Scope: scope,
PTALog: ptalog,
Reflection: *reflectFlag,
Output: output,
}
if err := Run(mode, &query); err != nil {
log.Fatal(err)
}
}