| // $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) |
| } |