Function parseCPU

profile/legacy_profile.go:304–325

parseCPU parses a profilez legacy profile and returns a newly populated Profile. The general format for profilez samples is a sequence of words in binary format. The first words are a header with the following data: 1st word -- 0 2nd word -- 3 3rd word -- 0 if a c++ application, 1 if a java app

(b []byte)

//	4th word -- Sampling period (in microseconds).
//	5th word -- Padding.
func parseCPU(b []byte) (*Profile, error) {
	var parse func([]byte) (uint64, []byte)
	var n1, n2, n3, n4, n5 uint64
	for _, parse = range cpuInts {
		var tmp []byte
		n1, tmp = parse(b)
		n2, tmp = parse(tmp)
		n3, tmp = parse(tmp)
		n4, tmp = parse(tmp)
		n5, tmp = parse(tmp)

		if tmp != nil && n1 == 0 && n2 == 3 && n3 == 0 && n4 > 0 && n5 == 0 {
			b = tmp
			return cpuProfile(b, int64(n4), parse)
		}
		if tmp != nil && n1 == 0 && n2 == 3 && n3 == 1 && n4 > 0 && n5 == 0 {
			b = tmp
			return javaCPUProfile(b, int64(n4), parse)
		}
	}
	return nil, errUnrecognized
}

// cpuProfile returns a new Profile from C++ profilez data.
// b is the profile bytes after the header, period is the profiling