go sizeof_test 源码
golang sizeof_test 代码
文件路径：/src/cmd/compile/internal/types/sizeof_test.go
// Copyright 2017 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 types
import (
"reflect"
"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
var tests = []struct {
val interface{} // type as a value
_32bit uintptr // size on 32bit platforms
_64bit uintptr // size on 64bit platforms
}{
{Sym{}, 32, 64},
{Type{}, 60, 104},
{Map{}, 20, 40},
{Forward{}, 20, 32},
{Func{}, 28, 48},
{Struct{}, 16, 32},
{Interface{}, 8, 16},
{Chan{}, 8, 16},
{Array{}, 12, 16},
{FuncArgs{}, 4, 8},
{ChanArgs{}, 4, 8},
{Ptr{}, 4, 8},
{Slice{}, 4, 8},
}
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)
}
}
}
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