1// Copyright 2018 The Go Authors. All rights reserved.
2// Use of this source code is governed by a BSD-style
3// license that can be found in the LICENSE file.
4
5package runtime_test
6
7import (
8	"reflect"
9	"runtime"
10	"testing"
11	"unsafe"
12)
13
14// Assert that the size of important structures do not change unexpectedly.
15
16func TestSizeof(t *testing.T) {
17	const _64bit = unsafe.Sizeof(uintptr(0)) == 8
18	var tests = []struct {
19		val    any     // type as a value
20		_32bit uintptr // size on 32bit platforms
21		_64bit uintptr // size on 64bit platforms
22	}{
23		{runtime.G{}, 272, 432},   // g, but exported for testing
24		{runtime.Sudog{}, 56, 88}, // sudog, but exported for testing
25	}
26
27	for _, tt := range tests {
28		want := tt._32bit
29		if _64bit {
30			want = tt._64bit
31		}
32		got := reflect.TypeOf(tt.val).Size()
33		if want != got {
34			t.Errorf("unsafe.Sizeof(%T) = %d, want %d", tt.val, got, want)
35		}
36	}
37}
38