Debugging golang in GDB

build.sh

go build -gcflags '-N'

gdb-output.txt

gdbtest (master|?) ~࿔ gdb gdbtest
GNU gdb (GDB) 7.8.1
Copyright (C) 2014 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.  Type "show copying"
and "show warranty" for details.
This GDB was configured as "x86_64-apple-darwin14.1.0".
Type "show configuration" for configuration details.
For bug reporting instructions, please see:
<http://www.gnu.org/software/gdb/bugs/>.
Find the GDB manual and other documentation resources online at:
<http://www.gnu.org/software/gdb/documentation/>.
For help, type "help".
Type "apropos word" to search for commands related to "word"...
Reading symbols from gdbtest...done.
(gdb) quit
gdbtest (master|?) ~࿔ build
zsh: command not found: build
gdbtest (master|?) ~࿔ build
gdbtest (master|?) ~࿔ make
go build -gcflags '-N'
gdbtest (master|?) ~࿔ gdb gdbtest
GNU gdb (GDB) 7.8.1
Copyright (C) 2014 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.  Type "show copying"
and "show warranty" for details.
This GDB was configured as "x86_64-apple-darwin14.1.0".
Type "show configuration" for configuration details.
For bug reporting instructions, please see:
<http://www.gnu.org/software/gdb/bugs/>.
Find the GDB manual and other documentation resources online at:
<http://www.gnu.org/software/gdb/documentation/>.
For help, type "help".
Type "apropos word" to search for commands related to "word"...
Reading symbols from gdbtest...done.
(gdb) l
1       package main
2
3       import "fmt"
4
5       type MyStruct struct {
6               x string
7               i int
8               f float64
9               m map[string] int64
10      }
(gdb) br 26
Breakpoint 1 at 0x2443: file /go/src/github.com/cevaris/gdbtest/main.go, line 26.
(gdb) run
Starting program: /go/src/github.com/cevaris/gdbtest/gdbtest
3
abc
[New Thread 0x1117 of process 3955]
[New Thread 0x1303 of process 3955]

Breakpoint 1, main.main () at /go/src/github.com/cevaris/gdbtest/main.go:26
26              fmt.Println(ms)
(gdb) info locals
i = 3
ms = 0x2081ba180
x = 0xdb470 "abc"
(gdb) p x
$1 = 0xdb470 "abc"
(gdb) p ms
$2 = (struct main.MyStruct *) 0x2081ba180
(gdb) p *ms
$3 = {x = 0xdbb10 "cba", i = 10, f = 11.103350000000001, m = 0x2081ba150}
(gdb) p ms.x
$4 = 0xdbb10 "cba"
(gdb) p *ms.m
$5 = {count = 2, flags = 0, hash0 = 1654797232, B = 0 '\000', buckets = 0x2081bc1a0, oldbuckets = 0x0, nevacuate = 0}
(gdb)

main.go

package main

import "fmt"

type MyStruct struct {
	x string
	i int
	f float64
	m map[string] int64
}

func main() {
	x := "abc"
	i := 3
	fmt.Println(i)
	fmt.Println(x)

	ms := &MyStruct{
		x: "cba",
		i: 10,
		f: 11.10335,
		m: make(map[string]int64),
	}
	ms.m["hello"] = int64(11)
	ms.m["world"] = int64(22)
	fmt.Println(ms)
}