mirror of
https://git.zx2c4.com/wireguard-go
synced 2024-11-15 01:05:15 +01:00
a4657f996d
This reverts the movement of fields from d49f4e9.
That commit was cherry-picked from another branch where a field
had changed and misaligned the atomic fields. After cherry-picking,
moving the fields was no longer necessary but got dragged along.
Signed-off-by: David Crawshaw <crawshaw@tailscale.com>
44 lines
1.1 KiB
Go
44 lines
1.1 KiB
Go
/* SPDX-License-Identifier: MIT
|
|
*
|
|
* Copyright (C) 2017-2019 WireGuard LLC. All Rights Reserved.
|
|
*/
|
|
|
|
package device
|
|
|
|
import (
|
|
"reflect"
|
|
"testing"
|
|
"unsafe"
|
|
)
|
|
|
|
func checkAlignment(t *testing.T, name string, offset uintptr) {
|
|
t.Helper()
|
|
if offset%8 != 0 {
|
|
t.Errorf("offset of %q within struct is %d bytes, which does not align to 64-bit word boundaries (missing %d bytes). Atomic operations will crash on 32-bit systems.", name, offset, 8-(offset%8))
|
|
}
|
|
}
|
|
|
|
// TestPeerAlignment checks that atomically-accessed fields are
|
|
// aligned to 64-bit boundaries, as required by the atomic package.
|
|
//
|
|
// Unfortunately, violating this rule on 32-bit platforms results in a
|
|
// hard segfault at runtime.
|
|
func TestPeerAlignment(t *testing.T) {
|
|
var p Peer
|
|
|
|
typ := reflect.TypeOf(p)
|
|
t.Logf("Peer type size: %d, with fields:", typ.Size())
|
|
for i := 0; i < typ.NumField(); i++ {
|
|
field := typ.Field(i)
|
|
t.Logf("\t%30s\toffset=%3v\t(type size=%3d, align=%d)",
|
|
field.Name,
|
|
field.Offset,
|
|
field.Type.Size(),
|
|
field.Type.Align(),
|
|
)
|
|
}
|
|
|
|
checkAlignment(t, "Peer.stats", unsafe.Offsetof(p.stats))
|
|
checkAlignment(t, "Peer.isRunning", unsafe.Offsetof(p.isRunning))
|
|
}
|