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sysgen: speed up

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Formatting generated sources takes tremendous amount of time (6s).
Leave them unformatted. Reduces sysgen time to virtually 0.
This commit is contained in:
Dmitry Vyukov 2017-05-26 16:11:54 +02:00
parent b6bb95c0ab
commit adc9c8bb06
1 changed files with 19 additions and 9 deletions
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28
sysgen/sysgen.go
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@ -8,12 +8,13 @@ import (
"bytes"
"flag"
"fmt"
"go/format"
"io"
"io/ioutil"
"os"
"path/filepath"
"regexp"
"runtime"
"runtime/pprof"
"sort"
"strconv"
"strings"
@ -22,7 +23,10 @@ import (
)
var (
flagV = flag.Int("v", 0, "verbosity")
flagV = flag.Int("v", 0, "verbosity")
flagMemProfile = flag.String("memprofile", "", "write a memory profile to the file")
intRegExp = regexp.MustCompile("^int([0-9]+|ptr)(be)?(:[0-9]+)?$")
)
const (
@ -87,6 +91,18 @@ func main() {
}
generateExecutorSyscalls(desc.Syscalls, consts)
if *flagMemProfile != "" {
f, err := os.Create(*flagMemProfile)
if err != nil {
failf("could not create memory profile: ", err)
}
runtime.GC() // get up-to-date statistics
if err := pprof.WriteHeapProfile(f); err != nil {
failf("could not write memory profile: ", err)
}
f.Close()
}
}
func readConsts(arch string) map[string]uint64 {
@ -672,7 +688,6 @@ func generateArg(
dir = "in"
fmt.Fprintf(out, "&PtrType{%v, Type: %v}", common(), generateType(a[1], a[0], desc, consts))
default:
intRegExp := regexp.MustCompile("^int([0-9]+|ptr)(be)?(:[0-9]+)?$")
if intRegExp.MatchString(typ) {
canBeArg = true
size, bigEndian, bitfieldLen := decodeIntType(typ)
@ -791,12 +806,7 @@ func isIdentifier(s string) bool {
return true
}
func writeSource(file string, data []byte) {
src, err := format.Source(data)
if err != nil {
fmt.Printf("%s\n", data)
failf("failed to format output: %v", err)
}
func writeSource(file string, src []byte) {
if oldSrc, err := ioutil.ReadFile(file); err == nil && bytes.Equal(src, oldSrc) {
return
}