1 files changed, 96 insertions, 0 deletions
diff --git a/src/cmd/addr2line/main.go b/src/cmd/addr2line/main.go
new file mode 100644
index 0000000..0188029
--- /dev/null
+++ b/src/cmd/addr2line/main.go
@@ -0,0 +1,96 @@
+// 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)
+	}
+	defer f.Close()
+
+	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()
+}