go main 源码
golang main 代码
文件路径：/misc/cgo/testplugin/testdata/checkdwarf/main.go
// 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.
// Usage:
//
// checkdwarf <exe> <suffix>
//
// Opens <exe>, which must be an executable or a library and checks that
// there is an entry in .debug_info whose name ends in <suffix>
package main
import (
"debug/dwarf"
"debug/elf"
"debug/macho"
"debug/pe"
"fmt"
"os"
"strings"
)
func usage() {
fmt.Fprintf(os.Stderr, "checkdwarf executable-or-library DIE-suffix\n")
}
type dwarfer interface {
DWARF() (*dwarf.Data, error)
}
func openElf(path string) dwarfer {
exe, err := elf.Open(path)
if err != nil {
return nil
}
return exe
}
func openMacho(path string) dwarfer {
exe, err := macho.Open(path)
if err != nil {
return nil
}
return exe
}
func openPE(path string) dwarfer {
exe, err := pe.Open(path)
if err != nil {
return nil
}
return exe
}
func main() {
if len(os.Args) != 3 {
usage()
}
exePath := os.Args[1]
dieSuffix := os.Args[2]
var exe dwarfer
for _, openfn := range []func(string) dwarfer{openMacho, openPE, openElf} {
exe = openfn(exePath)
if exe != nil {
break
}
}
if exe == nil {
fmt.Fprintf(os.Stderr, "could not open %s\n", exePath)
os.Exit(1)
}
data, err := exe.DWARF()
if err != nil {
fmt.Fprintf(os.Stderr, "%s: error opening DWARF: %v\n", exePath, err)
os.Exit(1)
}
rdr := data.Reader()
for {
e, err := rdr.Next()
if err != nil {
fmt.Fprintf(os.Stderr, "%s: error reading DWARF: %v\n", exePath, err)
os.Exit(1)
}
if e == nil {
break
}
name, hasname := e.Val(dwarf.AttrName).(string)
if !hasname {
continue
}
if strings.HasSuffix(name, dieSuffix) {
// found
os.Exit(0)
}
}
fmt.Fprintf(os.Stderr, "%s: no entry with a name ending in %q was found\n", exePath, dieSuffix)
os.Exit(1)
}
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