blob: 996f4516315d0dfe38148a013cbf2aa969cd84e7 [file] [log] [blame]
// Copyright 2018 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 runtime_test
import (
"internal/goexperiment"
"reflect"
"runtime"
"testing"
"unsafe"
)
// Assert that the size of important structures do not change unexpectedly.
func TestSizeof(t *testing.T) {
const _64bit = unsafe.Sizeof(uintptr(0)) == 8
g32bit := uintptr(264)
if goexperiment.ExecTracer2 {
// gTraceState changed from 2 uint64, 1 pointer, 1 bool to 2 uint64, 3 uint32.
// On 32-bit, that's one extra word.
g32bit += 4
}
var tests = []struct {
val any // type as a value
_32bit uintptr // size on 32bit platforms
_64bit uintptr // size on 64bit platforms
}{
{runtime.G{}, g32bit, 432}, // g, but exported for testing
{runtime.Sudog{}, 56, 88}, // sudog, but exported for testing
}
for _, tt := range tests {
want := tt._32bit
if _64bit {
want = tt._64bit
}
got := reflect.TypeOf(tt.val).Size()
if want != got {
t.Errorf("unsafe.Sizeof(%T) = %d, want %d", tt.val, got, want)
}
}
}