mirror of
https://github.com/golang/go
synced 2024-11-14 14:50:23 -07:00
f8f630f5ec
newstackcall creates a new stack segment, and we want to be able to throw away all that code. LGTM=khr R=khr, iant CC=dvyukov, golang-codereviews, r https://golang.org/cl/139270043
57 lines
1022 B
Go
57 lines
1022 B
Go
// run
|
|
|
|
// Copyright 2014 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.
|
|
|
|
package main
|
|
|
|
import (
|
|
"fmt"
|
|
"io"
|
|
"runtime"
|
|
)
|
|
|
|
type T struct {
|
|
io.Closer
|
|
}
|
|
|
|
func f1() {
|
|
// The 5 here and below depends on the number of internal runtime frames
|
|
// that sit between a deferred function called during panic and
|
|
// the original frame. If that changes, this test will start failing and
|
|
// the number here will need to be updated.
|
|
defer checkLine(5)
|
|
var t *T
|
|
var c io.Closer = t
|
|
c.Close()
|
|
}
|
|
|
|
func f2() {
|
|
defer checkLine(5)
|
|
var t T
|
|
var c io.Closer = t
|
|
c.Close()
|
|
}
|
|
|
|
func main() {
|
|
f1()
|
|
f2()
|
|
}
|
|
|
|
func checkLine(n int) {
|
|
if err := recover(); err == nil {
|
|
panic("did not panic")
|
|
}
|
|
var file string
|
|
var line int
|
|
for i := 1; i <= n; i++ {
|
|
_, file, line, _ = runtime.Caller(i)
|
|
if file != "<autogenerated>" || line != 1 {
|
|
continue
|
|
}
|
|
return
|
|
}
|
|
panic(fmt.Sprintf("expected <autogenerated>:1 have %s:%d", file, line))
|
|
}
|