| // run -race | |
| //go:build cgo && linux && amd64 | |
| // Copyright 2020 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" | |
| "testing" | |
| "unsafe" | |
| ) | |
| var buf [2]byte | |
| var x unsafe.Pointer = unsafe.Pointer(&buf[0]) | |
| func main() { | |
| n := testing.AllocsPerRun(1000, func() { | |
| x = unsafe.Pointer(uintptr(x) + 1) | |
| x = unsafe.Pointer(uintptr(x) - 1) | |
| }) | |
| if n > 0 { | |
| panic(fmt.Sprintf("too many allocations; want 0 got %f", n)) | |
| } | |
| } |