mirror of
https://github.com/golang/go
synced 2024-11-21 14:14:40 -07:00
1fa4173444
Shame on me: I fixed the same bug in 6l in 8691fcc6a66e (https://golang.org/cl/2609041) and neglected to look at 5l and 8l to see if they were affected. On the positive side, the check I added in that CL is the one that detected this bug. Fixes #1457. R=ken2 CC=golang-dev https://golang.org/cl/3981052
100 lines
1.7 KiB
Go
100 lines
1.7 KiB
Go
// $G $D/$F.go && $L $F.$A && ./$A.out
|
|
|
|
// Copyright 2009 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.
|
|
|
|
// Try to tickle stack splitting bugs by doing
|
|
// go, defer, and closure calls at different stack depths.
|
|
|
|
package main
|
|
|
|
type T [20]int
|
|
|
|
func g(c chan int, t T) {
|
|
s := 0
|
|
for i := 0; i < len(t); i++ {
|
|
s += t[i]
|
|
}
|
|
c <- s
|
|
}
|
|
|
|
func d(t T) {
|
|
s := 0
|
|
for i := 0; i < len(t); i++ {
|
|
s += t[i]
|
|
}
|
|
if s != len(t) {
|
|
println("bad defer", s)
|
|
panic("fail")
|
|
}
|
|
}
|
|
|
|
func f0() {
|
|
// likely to make a new stack for f0,
|
|
// because the call to f1 puts 3000 bytes
|
|
// in our frame.
|
|
f1()
|
|
}
|
|
|
|
func f1() [3000]byte {
|
|
// likely to make a new stack for f1,
|
|
// because 3000 bytes were used by f0
|
|
// and we need 3000 more for the call
|
|
// to f2. if the call to morestack in f1
|
|
// does not pass the frame size, the new
|
|
// stack (default size 5k) will not be big
|
|
// enough for the frame, and the morestack
|
|
// check in f2 will die, if we get that far
|
|
// without faulting.
|
|
f2()
|
|
return [3000]byte{}
|
|
}
|
|
|
|
func f2() [3000]byte {
|
|
// just take up space
|
|
return [3000]byte{}
|
|
}
|
|
|
|
var c = make(chan int)
|
|
var t T
|
|
var b = []byte{1, 2, 3, 4, 5, 6, 7, 8, 9, 10}
|
|
|
|
func recur(n int) {
|
|
ss := string(b)
|
|
if len(ss) != len(b) {
|
|
panic("bad []byte -> string")
|
|
}
|
|
go g(c, t)
|
|
f0()
|
|
s := <-c
|
|
if s != len(t) {
|
|
println("bad go", s)
|
|
panic("fail")
|
|
}
|
|
f := func(t T) int {
|
|
s := 0
|
|
for i := 0; i < len(t); i++ {
|
|
s += t[i]
|
|
}
|
|
s += n
|
|
return s
|
|
}
|
|
s = f(t)
|
|
if s != len(t)+n {
|
|
println("bad func", s, "at level", n)
|
|
panic("fail")
|
|
}
|
|
if n > 0 {
|
|
recur(n - 1)
|
|
}
|
|
defer d(t)
|
|
}
|
|
|
|
func main() {
|
|
for i := 0; i < len(t); i++ {
|
|
t[i] = 1
|
|
}
|
|
recur(8000)
|
|
}
|