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// run
// Copyright 2010 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
// Test that structures pack densely, according to the alignment of the largest field.
package main
import (
"fmt"
"os"
"strconv"
)
type T1 struct {
x uint8
}
type T2 struct {
x uint16
}
type T4 struct {
x uint32
}
func main() {
report := len(os.Args) > 1
status := 0
var b1 [10]T1
a0, _ := strconv.ParseUint(fmt.Sprintf("%p", &b1[0])[2:], 16, 64)
a1, _ := strconv.ParseUint(fmt.Sprintf("%p", &b1[1])[2:], 16, 64)
if a1 != a0+1 {
fmt.Println("FAIL")
if report {
fmt.Println("alignment should be 1, is", a1-a0)
}
status = 1
}
var b2 [10]T2
a0, _ = strconv.ParseUint(fmt.Sprintf("%p", &b2[0])[2:], 16, 64)
a1, _ = strconv.ParseUint(fmt.Sprintf("%p", &b2[1])[2:], 16, 64)
if a1 != a0+2 {
if status == 0 {
fmt.Println("FAIL")
status = 1
}
if report {
fmt.Println("alignment should be 2, is", a1-a0)
}
}
var b4 [10]T4
a0, _ = strconv.ParseUint(fmt.Sprintf("%p", &b4[0])[2:], 16, 64)
a1, _ = strconv.ParseUint(fmt.Sprintf("%p", &b4[1])[2:], 16, 64)
if a1 != a0+4 {
if status == 0 {
fmt.Println("FAIL")
status = 1
}
if report {
fmt.Println("alignment should be 4, is", a1-a0)
}
}
os.Exit(status)
}
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