sizeof_test.go

Documentation: cmd/internal/obj

     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  package obj
     6  
     7  import (
     8  	"reflect"
     9  	"testing"
    10  	"unsafe"
    11  )
    12  
    13  // Assert that the size of important structures do not change unexpectedly.
    14  
    15  func TestSizeof(t *testing.T) {
    16  	const _64bit = unsafe.Sizeof(uintptr(0)) == 8
    17  
    18  	var tests = []struct {
    19  		val    interface{} // type as a value
    20  		_32bit uintptr     // size on 32bit platforms
    21  		_64bit uintptr     // size on 64bit platforms
    22  	}{
    23  		{Addr{}, 32, 48},
    24  		{LSym{}, 72, 120},
    25  		{Prog{}, 132, 200},
    26  	}
    27  
    28  	for _, tt := range tests {
    29  		want := tt._32bit
    30  		if _64bit {
    31  			want = tt._64bit
    32  		}
    33  		got := reflect.TypeOf(tt.val).Size()
    34  		if want != got {
    35  			t.Errorf("unsafe.Sizeof(%T) = %d, want %d", tt.val, got, want)
    36  		}
    37  	}
    38  }
    39
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