mirror of
https://github.com/golang/go.git
synced 2024-09-29 22:37:06 +00:00
4b22e1bdb6
Passing an argument to bug260 will indicate which alignments are wrong. R=r CC=golang-dev https://golang.org/cl/231042
56 lines
1.2 KiB
Go
56 lines
1.2 KiB
Go
// $G $D/$F.go && $L $F.$A && ./$A.out || echo BUG: bug260 failed
|
|
|
|
// 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.Btoui64(fmt.Sprintf("%p", &b1[0])[2:], 16)
|
|
a1, _ := strconv.Btoui64(fmt.Sprintf("%p", &b1[1])[2:], 16)
|
|
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.Btoui64(fmt.Sprintf("%p", &b2[0])[2:], 16)
|
|
a1, _ = strconv.Btoui64(fmt.Sprintf("%p", &b2[1])[2:], 16)
|
|
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.Btoui64(fmt.Sprintf("%p", &b4[0])[2:], 16)
|
|
a1, _ = strconv.Btoui64(fmt.Sprintf("%p", &b4[1])[2:], 16)
|
|
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)
|
|
}
|