mirror of
https://github.com/golang/go
synced 2024-09-05 07:54:46 +00:00
48 lines
1.1 KiB
Go
48 lines
1.1 KiB
Go
![]() |
// run -gcflags=-d=maymorestack=main.mayMoreStack
|
||
|
|
||
|
// 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.
|
||
|
|
||
|
// Test the maymorestack testing hook by injecting a hook that counts
|
||
|
// how many times it is called and checking that count.
|
||
|
|
||
|
package main
|
||
|
|
||
|
import "runtime"
|
||
|
|
||
|
var count uint32
|
||
|
|
||
|
//go:nosplit
|
||
|
func mayMoreStack() {
|
||
|
count++
|
||
|
}
|
||
|
|
||
|
func main() {
|
||
|
const wantCount = 128
|
||
|
|
||
|
anotherFunc(wantCount - 1) // -1 because the call to main already counted
|
||
|
|
||
|
if count == 0 {
|
||
|
panic("mayMoreStack not called")
|
||
|
} else if count != wantCount {
|
||
|
println(count, "!=", wantCount)
|
||
|
panic("wrong number of calls to mayMoreStack")
|
||
|
}
|
||
|
}
|
||
|
|
||
|
//go:noinline
|
||
|
func anotherFunc(n int) {
|
||
|
// Trigger a stack growth on at least some calls to
|
||
|
// anotherFunc to test that mayMoreStack is called outside the
|
||
|
// morestack loop. It's also important that it is called
|
||
|
// before (not after) morestack, but that's hard to test.
|
||
|
var x [1 << 10]byte
|
||
|
|
||
|
if n > 1 {
|
||
|
anotherFunc(n - 1)
|
||
|
}
|
||
|
|
||
|
runtime.KeepAlive(x)
|
||
|
}
|