add perf -F +symline

[slicklash]

Problem

We want to parse and convert perf script output into pprof format. It's not possible without original binary and external tooling to derive Function.StartLine easily.

Solution

Implement symline option which outputs symbol in following format <symbol name>+<src line>+<symbol start line>

my_go_app   74083 20742.814623:     250000 cpu-clock:u: 
  4af76b main.cpuIntensiveWork+bar.go:21+bar.go:14 (/home/slicklash/tmp/perf/my_go_app)
  4af838 main.bar+bar.go:42+bar.go:40 (/home/slicklash/tmp/perf/my_go_app)
  4af7e9 main.foo+bar.go:35+bar.go:33 (/home/slicklash/tmp/perf/my_go_app)
  4afb87 main.main+bar.go:62+bar.go:48 (/home/slicklash/tmp/perf/my_go_app)
  436f5d runtime.main+types.go:194+proc.go:146 (/home/slicklash/tmp/perf/my_go_app)
  4652c1 runtime.goexit.abi0+asm_amd64.s:1696+asm_amd64.s:1695 (/home/slicklash/tmp/perf/my_go_app)

[Jongy]

Output looks good. I have some minor comments

[Jongy]

lgtm, can I merge @slicklash ?

[slicklash]

lgtm, can I merge @slicklash ?

sure