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// Copyright 2012 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.
// Addr2line is a minimal simulation of the GNU addr2line tool,
// just enough to support pprof.
//
// Usage:
// go tool addr2line binary
//
// Addr2line reads hexadecimal addresses, one per line and with optional 0x prefix,
// from standard input. For each input address, addr2line prints two output lines,
// first the name of the function containing the address and second the file:line
// of the source code corresponding to that address.
//
// This tool is intended for use only by pprof; its interface may change or
// it may be deleted entirely in future releases.
package main
import (
"bufio"
"flag"
"fmt"
"log"
"os"
"strconv"
"strings"
"cmd/internal/objfile"
)
func printUsage(w *os.File) {
fmt.Fprintf(w, "usage: addr2line binary\n")
fmt.Fprintf(w, "reads addresses from standard input and writes two lines for each:\n")
fmt.Fprintf(w, "\tfunction name\n")
fmt.Fprintf(w, "\tfile:line\n")
}
func usage() {
printUsage(os.Stderr)
os.Exit(2)
}
func main() {
log.SetFlags(0)
log.SetPrefix("addr2line: ")
// pprof expects this behavior when checking for addr2line
if len(os.Args) > 1 && os.Args[1] == "--help" {
printUsage(os.Stdout)
os.Exit(0)
}
flag.Usage = usage
flag.Parse()
if flag.NArg() != 1 {
usage()
}
f, err := objfile.Open(flag.Arg(0))
if err != nil {
log.Fatal(err)
}
tab, err := f.PCLineTable()
if err != nil {
log.Fatalf("reading %s: %v", flag.Arg(0), err)
}
stdin := bufio.NewScanner(os.Stdin)
stdout := bufio.NewWriter(os.Stdout)
for stdin.Scan() {
p := stdin.Text()
if strings.Contains(p, ":") {
// Reverse translate file:line to pc.
// This was an extension in the old C version of 'go tool addr2line'
// and is probably not used by anyone, but recognize the syntax.
// We don't have an implementation.
fmt.Fprintf(stdout, "!reverse translation not implemented\n")
continue
}
pc, _ := strconv.ParseUint(strings.TrimPrefix(p, "0x"), 16, 64)
file, line, fn := tab.PCToLine(pc)
name := "?"
if fn != nil {
name = fn.Name
} else {
file = "?"
line = 0
}
fmt.Fprintf(stdout, "%s\n%s:%d\n", name, file, line)
}
stdout.Flush()
}
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