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// +build !nacl,!js,!gccgo
// run
// Copyright 2019 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.
// Test that the linker permits long call sequences.
package main
import (
"bytes"
"fmt"
"io/ioutil"
"os"
"os/exec"
"path/filepath"
"strconv"
)
const start = `
package main
func main() {
println(f0() + 1)
}
`
const fn = `
//go:noinline
func f%d() int {
return f%d() + 1
}`
const fnlast = `
//go:noinline
func f%d() int {
return 0
}
`
const count = 400
func main() {
if err := test(); err != nil {
fmt.Fprintln(os.Stderr, err)
os.Exit(1)
}
}
func test() error {
var buf bytes.Buffer
buf.WriteString(start)
for i := 0; i < count; i++ {
fmt.Fprintf(&buf, fn, i, i + 1)
}
fmt.Fprintf(&buf, fnlast, count)
dir, err := ioutil.TempDir("", "issue33555")
if err != nil {
return err
}
defer os.RemoveAll(dir)
fn := filepath.Join(dir, "x.go")
if err := ioutil.WriteFile(fn, buf.Bytes(), 0644); err != nil {
return err
}
out, err := exec.Command("go", "run", fn).CombinedOutput()
if err != nil {
return err
}
want := strconv.Itoa(count + 1)
if got := string(bytes.TrimSpace(out)); got != want {
return fmt.Errorf("got %q want %q", got, want)
}
return nil
}
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