forked from OSchip/llvm-project
93 lines
1.7 KiB
Go
93 lines
1.7 KiB
Go
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package main
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import (
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"bufio"
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"debug/elf"
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"fmt"
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"os"
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"strconv"
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"strings"
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)
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func symsizes(path string) map[string]float64 {
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m := make(map[string]float64)
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f, err := elf.Open(path)
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if err != nil {
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panic(err.Error())
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}
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syms, err := f.Symbols()
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if err != nil {
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panic(err.Error())
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}
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for _, sym := range syms {
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if sym.Section < elf.SectionIndex(len(f.Sections)) && f.Sections[sym.Section].Name == ".text" {
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m[sym.Name] = float64(sym.Size)
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}
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}
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return m
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}
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func benchnums(path, stat string) map[string]float64 {
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m := make(map[string]float64)
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fh, err := os.Open(path)
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if err != nil {
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panic(err.Error())
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}
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scanner := bufio.NewScanner(fh)
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for scanner.Scan() {
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elems := strings.Split(scanner.Text(), "\t")
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if !strings.HasPrefix(elems[0], "Benchmark") || len(elems) < 3 {
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continue
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}
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var s string
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for _, elem := range elems[2:] {
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selems := strings.Split(strings.TrimSpace(elem), " ")
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if selems[1] == stat {
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s = selems[0]
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}
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}
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if s != "" {
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ns, err := strconv.ParseFloat(s, 64)
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if err != nil {
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panic(scanner.Text() + " ---- " + err.Error())
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}
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m[elems[0]] = ns
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}
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}
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if err := scanner.Err(); err != nil {
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panic(err)
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}
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return m
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}
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func main() {
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var cmp func(string) map[string]float64
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switch os.Args[1] {
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case "symsizes":
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cmp = symsizes
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case "benchns":
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cmp = func(path string) map[string]float64 {
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return benchnums(path, "ns/op")
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}
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case "benchallocs":
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cmp = func(path string) map[string]float64 {
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return benchnums(path, "allocs/op")
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}
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}
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syms1 := cmp(os.Args[2])
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syms2 := cmp(os.Args[3])
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for n, z1 := range syms1 {
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if z2, ok := syms2[n]; ok && z2 != 0 {
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fmt.Printf("%s %f %f %f\n", n, z1, z2, z1/z2)
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}
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}
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}
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