1// run
2
3//go:build !nacl && !js && !wasip1 && !android && !gccgo
4
5// Copyright 2016 The Go Authors. All rights reserved.
6// Use of this source code is governed by a BSD-style
7// license that can be found in the LICENSE file.
8
9package main
10
11import (
12	"bytes"
13	"fmt"
14	"html/template"
15	"io/ioutil"
16	"log"
17	"os"
18	"os/exec"
19	"path/filepath"
20)
21
22var tmpl = template.Must(template.New("main").Parse(`
23package main
24
25type T struct {
26    {{range .Names}}
27	{{.Name}} *string
28	{{end}}
29}
30
31{{range .Names}}
32func (t *T) Get{{.Name}}() string {
33	if t.{{.Name}} == nil {
34		return ""
35	}
36	return *t.{{.Name}}
37}
38{{end}}
39
40func main() {}
41`))
42
43func main() {
44	const n = 5000
45
46	type Name struct{ Name string }
47	var t struct{ Names []Name }
48	for i := 0; i < n; i++ {
49		t.Names = append(t.Names, Name{Name: fmt.Sprintf("H%06X", i)})
50	}
51
52	buf := new(bytes.Buffer)
53	if err := tmpl.Execute(buf, t); err != nil {
54		log.Fatal(err)
55	}
56
57	dir, err := ioutil.TempDir("", "issue16037-")
58	if err != nil {
59		log.Fatal(err)
60	}
61	defer os.RemoveAll(dir)
62	path := filepath.Join(dir, "ridiculous_number_of_fields.go")
63	if err := ioutil.WriteFile(path, buf.Bytes(), 0664); err != nil {
64		log.Fatal(err)
65	}
66
67	out, err := exec.Command("go", "build", "-o="+filepath.Join(dir, "out"), path).CombinedOutput()
68	if err != nil {
69		log.Fatalf("build failed: %v\n%s", err, out)
70	}
71}
72