74 lines
1.7 KiB
Go
74 lines
1.7 KiB
Go
// Copyright 2021 The Go Authors. All rights reserved.
|
|
// Use of this source code is governed by a BSD-style
|
|
// license that can be found in the LICENSE file.
|
|
|
|
//go:build ignore
|
|
// +build ignore
|
|
|
|
// mkconsts generates const definition files for each GOEXPERIMENT.
|
|
package main
|
|
|
|
import (
|
|
"bytes"
|
|
"fmt"
|
|
"internal/goexperiment"
|
|
"log"
|
|
"os"
|
|
"reflect"
|
|
"strings"
|
|
)
|
|
|
|
func main() {
|
|
// Delete existing experiment constant files.
|
|
ents, err := os.ReadDir(".")
|
|
if err != nil {
|
|
log.Fatal(err)
|
|
}
|
|
for _, ent := range ents {
|
|
name := ent.Name()
|
|
if !strings.HasPrefix(name, "exp_") {
|
|
continue
|
|
}
|
|
// Check that this is definitely a generated file.
|
|
data, err := os.ReadFile(name)
|
|
if err != nil {
|
|
log.Fatalf("reading %s: %v", name, err)
|
|
}
|
|
if !bytes.Contains(data, []byte("Code generated by mkconsts")) {
|
|
log.Fatalf("%s: expected generated file", name)
|
|
}
|
|
if err := os.Remove(name); err != nil {
|
|
log.Fatal(err)
|
|
}
|
|
}
|
|
|
|
// Generate new experiment constant files.
|
|
rt := reflect.TypeOf(&goexperiment.Flags{}).Elem()
|
|
for i := 0; i < rt.NumField(); i++ {
|
|
f := rt.Field(i).Name
|
|
buildTag := "goexperiment." + strings.ToLower(f)
|
|
for _, val := range []bool{false, true} {
|
|
name := fmt.Sprintf("exp_%s_%s.go", strings.ToLower(f), pick(val, "off", "on"))
|
|
data := fmt.Sprintf(`// Code generated by mkconsts.go. DO NOT EDIT.
|
|
|
|
//go:build %s%s
|
|
// +build %s%s
|
|
|
|
package goexperiment
|
|
|
|
const %s = %v
|
|
const %sInt = %s
|
|
`, pick(val, "!", ""), buildTag, pick(val, "!", ""), buildTag, f, val, f, pick(val, "0", "1"))
|
|
if err := os.WriteFile(name, []byte(data), 0666); err != nil {
|
|
log.Fatalf("writing %s: %v", name, err)
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
func pick(v bool, f, t string) string {
|
|
if v {
|
|
return t
|
|
}
|
|
return f
|
|
}
|