mirror of
https://github.com/golang/go
synced 2024-09-05 16:04:50 +00:00
![Rémy Oudompheng](/assets/img/avatar_default.png)
Apply sed with: 1s,^// $G $D/$F.go && $L $F.$A && ./$A.out || echo.*,// run, 1s,^// $G $D/$F.go || echo.*,// compile, R=golang-dev, rsc CC=golang-dev https://golang.org/cl/5656099
66 lines
1.3 KiB
Go
66 lines
1.3 KiB
Go
// 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)
|
|
}
|