This program, dwdisplayfcn, provides a tool for displaying DWARF location expression information for variables and parameters alonside the assembly for a compiled Go function. Example:
$ cat small.go
package main
//go:noinline
func ABC(s string, t int) int {
return len(s) + t
}
func main() {
println(ABC("foo", 9))
}
$ go build -gcflags="-l -N" small.go
$ ./dwdisplayfcn -f main.ABC -m small
found function main.ABC at offset 3e4de lowpc 4553a0
...
Disassembly of section .text:
00000000004553a0 <main.ABC>:
main.ABC():
/home/thanm/small.go:4
4553a0: sub $0x18,%rsp
^ "s" now in: { [0: S=8 reg=RAX] [1: S=8 reg=RBX]
^ "t" now in: { [0: S=0 reg=RCX]
4553a4: mov %rbp,0x10(%rsp)
4553a9: lea 0x10(%rsp),%rbp
...
$
Under the hood, dwdisplayfcn uses a combination of the Golang standard library's "debug/dwarf" package, plus a set of APIs exported by Delve for examining program debug info.