diff options
Diffstat (limited to 'device/alignment_test.go')
-rw-r--r-- | device/alignment_test.go | 65 |
1 files changed, 0 insertions, 65 deletions
diff --git a/device/alignment_test.go b/device/alignment_test.go deleted file mode 100644 index a918112..0000000 --- a/device/alignment_test.go +++ /dev/null @@ -1,65 +0,0 @@ -/* SPDX-License-Identifier: MIT - * - * Copyright (C) 2017-2021 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).Elem() - 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)) -} - -// TestDeviceAlignment 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 TestDeviceAlignment(t *testing.T) { - var d Device - - typ := reflect.TypeOf(&d).Elem() - t.Logf("Device 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, "Device.rate.underLoadUntil", unsafe.Offsetof(d.rate)+unsafe.Offsetof(d.rate.underLoadUntil)) -} |