Golang debug using GDB?
Golang now works well with GDB
Here is an example golang app gdbtest
- gdbtest/
- main.go
Take the following example main.go
package main
import "fmt"
type MyStruct struct {
x string
i int
f float64
}
func main() {
x := "abc"
i := 3
fmt.Println(i)
fmt.Println(x)
ms := &MyStruct{
x: "cba",
i: 10,
f: 11.10335,
}
fmt.Println(ms)
}
Save that to main.go. Then compile with the follwing gcflag
flag.
go build -gcflags "-N"
Open gdb with your newly built golang app
gdb gdbtest
# or
gdb <PROJECT_NAME>
You now have full control of gdb. For example, add a breakpoint with br <linenumber>
command, then execute the app with run
(gdb) br 22
Breakpoint 1 at 0x2311: file /go/src/github.com/cevaris/gdbtest/main.go, line 22.
(gdb) run
Starting program: /go/src/github.com/cevaris/gdbtest/gdbtest
3
abc
Breakpoint 1, main.main () at /go/src/github.com/cevaris/gdbtest/main.go:22
22 fmt.Println(ms)
(gdb)
Now you can print all the local variables
(gdb) info locals
i = 3
ms = 0x20819e020
x = 0xdb1d0 "abc"
Even get access to the pointers
(gdb) p ms
$1 = (struct main.MyStruct *) 0x20819e020
(gdb) p *ms
$2 = {x = 0xdb870 "cba", i = 10, f = 11.103350000000001}
Go does not work well with GDB and one of the known problems is the printing of values.
More details can be found here.