// doQuery poses query q to the oracle and writes its response and
// error (if any) to out.
func doQuery(out io.Writer, q *query, useJson bool) {
fmt.Fprintf(out, "-------- @%s %s --------\n", q.verb, q.id)
var buildContext = build.Default
buildContext.GOPATH = "testdata"
query := oracle.Query{
Mode: q.verb,
Pos: q.queryPos,
Build: &buildContext,
Scope: []string{q.filename},
Reflection: true,
}
if err := oracle.Run(&query); err != nil {
fmt.Fprintf(out, "\nError: %s\n", err)
return
}
if useJson {
// JSON output
b, err := json.MarshalIndent(query.Serial(), "", "\t")
if err != nil {
fmt.Fprintf(out, "JSON error: %s\n", err.Error())
return
}
out.Write(b)
fmt.Fprintln(out)
} else {
// "plain" (compiler diagnostic format) output
WriteResult(out, &query)
}
}
func runOracle(cmd *command.Command, args []string) error {
if len(args) < 2 {
cmd.Usage()
return os.ErrInvalid
}
if os.Getenv("GOMAXPROCS") == "" {
n := runtime.NumCPU()
if n < 4 {
n = 4
}
runtime.GOMAXPROCS(n)
}
mode := args[0]
args = args[1:]
if args[0] == "." {
pkgPath, err := os.Getwd()
if err != nil {
log.Fatalln(err)
}
pkg, err := build.Default.ImportDir(pkgPath, 0)
if err != nil {
log.Fatalln(err)
}
args = pkg.GoFiles
//log.Println(pkg.ImportPath)
if pkg.ImportPath != "." && pkg.ImportPath != "" {
args = []string{pkg.ImportPath}
}
}
query := oracle.Query{
Mode: mode,
Pos: oraclePos,
Build: &build.Default,
Scope: args,
PTALog: nil,
Reflection: oracleReflect,
}
if err := oracle.Run(&query); err != nil {
fmt.Fprintf(os.Stderr, "oracle: %s.\n", err)
return err
}
if mode == "referrers" {
ref := query.Serial().Referrers
if ref != nil {
fmt.Fprintln(os.Stdout, ref.Desc)
fmt.Fprintln(os.Stdout, ref.ObjPos)
for _, v := range ref.Refs {
fmt.Fprintln(os.Stdout, v)
}
}
} else {
query.WriteTo(os.Stdout)
}
return nil
}
// Find usages for the given candidate symbols in the local system gopath.
// Relies on oracle to find referrers.
func FindUsages(candidates []UnexportCandidate, dir string) []CandidateWithUsage {
data := []CandidateWithUsage{}
workCh := make(chan UnexportCandidate, len(candidates))
resultChan := make(chan CandidateWithUsage)
quit := make(chan struct{})
// run oracle on 10 symbols at a time in parallel.
for i := 0; i < 10; i++ {
go func() {
for {
select {
case <-quit:
return
case c := <-workCh:
q := &oracle.Query{}
q.Build = &build.Default
q.Mode = "referrers"
q.Pos = fmt.Sprintf("%s:#%d", c.Pos.Filename, c.Pos.Offset)
err := oracle.Run(q)
if err != nil {
resultChan <- CandidateWithUsage{c, []string{err.Error()}}
break
}
refs := q.Serial().Referrers
usage := CandidateWithUsage{c, nil}
for _, ref := range refs.Refs {
// filter out usages from within the package itself
file := ref[:strings.LastIndex(ref, ":")]
file = file[:strings.LastIndex(file, ":")]
if filepath.Dir(file) != dir {
usage.References = append(usage.References, ref)
}
}
resultChan <- usage
}
}
}()
}
for _, c := range candidates {
workCh <- c
}
for len(data) < len(candidates) {
r := <-resultChan
data = append(data, r)
verbosef("Usages of %s:", r.DisplayName)
if len(r.References) == 0 {
verbose("", "None Found.")
} else {
for _, ref := range r.References {
verbose("", ref)
}
}
}
close(quit)
return data
}
func main() {
// 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) == 0 || args[0] == "" {
fmt.Fprint(os.Stderr, "oracle: a mode argument is required.\n"+useHelp)
os.Exit(2)
}
mode := args[0]
args = 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 *cpuprofile != "" {
f, err := os.Create(*cpuprofile)
if err != nil {
log.Fatal(err)
}
pprof.StartCPUProfile(f)
defer pprof.StopCPUProfile()
}
// -format flag
switch *formatFlag {
case "json", "plain", "xml":
// ok
default:
fmt.Fprintf(os.Stderr, "oracle: illegal -format value: %q.\n"+useHelp, *formatFlag)
os.Exit(2)
}
// Ask the oracle.
query := oracle.Query{
Mode: mode,
Pos: *posFlag,
Build: &build.Default,
Scope: args,
PTALog: ptalog,
Reflection: *reflectFlag,
}
if err := oracle.Run(&query); err != nil {
fmt.Fprintf(os.Stderr, "oracle: %s\n", err)
os.Exit(1)
}
// Print the result.
switch *formatFlag {
case "json":
b, err := json.MarshalIndent(query.Serial(), "", "\t")
if err != nil {
fmt.Fprintf(os.Stderr, "oracle: JSON error: %s\n", err)
os.Exit(1)
}
os.Stdout.Write(b)
case "xml":
b, err := xml.MarshalIndent(query.Serial(), "", "\t")
if err != nil {
fmt.Fprintf(os.Stderr, "oracle: XML error: %s\n", err)
os.Exit(1)
}
os.Stdout.Write(b)
case "plain":
query.WriteTo(os.Stdout)
}
}