github.com/miolini/go@v0.0.0-20160405192216-fca68c8cb408/src/cmd/compile/internal/gc/sizeof_test.go (about)

     1  // Copyright 2016 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  
     5  // +build !nacl
     6  
     7  package gc
     8  
     9  import (
    10  	"reflect"
    11  	"testing"
    12  	"unsafe"
    13  )
    14  
    15  // Assert that the size of important structures do not change unexpectedly.
    16  
    17  func TestSizeof(t *testing.T) {
    18  	const _64bit = unsafe.Sizeof(uintptr(0)) == 8
    19  
    20  	var tests = []struct {
    21  		val    interface{} // type as a value
    22  		_32bit uintptr     // size on 32bit platforms
    23  		_64bit uintptr     // size on 64bit platforms
    24  	}{
    25  		{Flow{}, 52, 88},
    26  		{Func{}, 96, 168},
    27  		{Name{}, 52, 80},
    28  		{Node{}, 92, 144},
    29  		{Sym{}, 60, 112},
    30  		{Type{}, 116, 184},
    31  	}
    32  
    33  	for _, tt := range tests {
    34  		want := tt._32bit
    35  		if _64bit {
    36  			want = tt._64bit
    37  		}
    38  		got := reflect.TypeOf(tt.val).Size()
    39  		if want != got {
    40  			t.Errorf("unsafe.Sizeof(%T) = %d, want %d", tt.val, got, want)
    41  		}
    42  	}
    43  }