| 1 | // Copyright 2017 The Go Authors. All rights reserved. |
|---|---|
| 2 | // Use of this source code is governed by a BSD-style |
| 3 | // license that can be found in the LICENSE file. |
| 4 | |
| 5 | //go:build ignore |
| 6 | // +build ignore |
| 7 | |
| 8 | // The gcexportdata command is a diagnostic tool that displays the |
| 9 | // contents of gc export data files. |
| 10 | package main |
| 11 | |
| 12 | import ( |
| 13 | "flag" |
| 14 | "fmt" |
| 15 | "go/token" |
| 16 | "go/types" |
| 17 | "log" |
| 18 | "os" |
| 19 | |
| 20 | "golang.org/x/tools/go/gcexportdata" |
| 21 | "golang.org/x/tools/go/types/typeutil" |
| 22 | ) |
| 23 | |
| 24 | var packageFlag = flag.String("package", "", "alternative package to print") |
| 25 | |
| 26 | func main() { |
| 27 | log.SetPrefix("gcexportdata: ") |
| 28 | log.SetFlags(0) |
| 29 | flag.Usage = func() { |
| 30 | fmt.Fprintln(os.Stderr, "usage: gcexportdata [-package path] file.a") |
| 31 | } |
| 32 | flag.Parse() |
| 33 | if flag.NArg() != 1 { |
| 34 | flag.Usage() |
| 35 | os.Exit(2) |
| 36 | } |
| 37 | filename := flag.Args()[0] |
| 38 | |
| 39 | f, err := os.Open(filename) |
| 40 | if err != nil { |
| 41 | log.Fatal(err) |
| 42 | } |
| 43 | |
| 44 | r, err := gcexportdata.NewReader(f) |
| 45 | if err != nil { |
| 46 | log.Fatalf("%s: %s", filename, err) |
| 47 | } |
| 48 | |
| 49 | // Decode the package. |
| 50 | const primary = "<primary>" |
| 51 | imports := make(map[string]*types.Package) |
| 52 | fset := token.NewFileSet() |
| 53 | pkg, err := gcexportdata.Read(r, fset, imports, primary) |
| 54 | if err != nil { |
| 55 | log.Fatalf("%s: %s", filename, err) |
| 56 | } |
| 57 | |
| 58 | // Optionally select an indirectly mentioned package. |
| 59 | if *packageFlag != "" { |
| 60 | pkg = imports[*packageFlag] |
| 61 | if pkg == nil { |
| 62 | fmt.Fprintf(os.Stderr, "export data file %s does not mention %s; has:\n", |
| 63 | filename, *packageFlag) |
| 64 | for p := range imports { |
| 65 | if p != primary { |
| 66 | fmt.Fprintf(os.Stderr, "\t%s\n", p) |
| 67 | } |
| 68 | } |
| 69 | os.Exit(1) |
| 70 | } |
| 71 | } |
| 72 | |
| 73 | // Print all package-level declarations, including non-exported ones. |
| 74 | fmt.Printf("package %s\n", pkg.Name()) |
| 75 | for _, imp := range pkg.Imports() { |
| 76 | fmt.Printf("import %q\n", imp.Path()) |
| 77 | } |
| 78 | qual := func(p *types.Package) string { |
| 79 | if pkg == p { |
| 80 | return "" |
| 81 | } |
| 82 | return p.Name() |
| 83 | } |
| 84 | scope := pkg.Scope() |
| 85 | for _, name := range scope.Names() { |
| 86 | obj := scope.Lookup(name) |
| 87 | fmt.Printf("%s: %s\n", |
| 88 | fset.Position(obj.Pos()), |
| 89 | types.ObjectString(obj, qual)) |
| 90 | |
| 91 | // For types, print each method. |
| 92 | if _, ok := obj.(*types.TypeName); ok { |
| 93 | for _, method := range typeutil.IntuitiveMethodSet(obj.Type(), nil) { |
| 94 | fmt.Printf("%s: %s\n", |
| 95 | fset.Position(method.Obj().Pos()), |
| 96 | types.SelectionString(method, qual)) |
| 97 | } |
| 98 | } |
| 99 | } |
| 100 | } |
| 101 |
Members