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https://github.com/golang/go
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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
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// Test that structures pack densely, according to the alignment of the largest field.
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package main
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import (
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"fmt"
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"os"
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"strconv"
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)
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type T1 struct { x uint8 }
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type T2 struct { x uint16 }
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type T4 struct { x uint32 }
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func main() {
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report := len(os.Args) > 1
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status := 0
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var b1 [10]T1
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a0, _ := strconv.Btoui64(fmt.Sprintf("%p", &b1[0])[2:], 16)
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a1, _ := strconv.Btoui64(fmt.Sprintf("%p", &b1[1])[2:], 16)
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if a1 != a0 + 1 {
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fmt.Println("FAIL")
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if report {
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fmt.Println("alignment should be 1, is", a1-a0)
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}
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status = 1
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}
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var b2 [10]T2
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a0, _ = strconv.Btoui64(fmt.Sprintf("%p", &b2[0])[2:], 16)
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a1, _ = strconv.Btoui64(fmt.Sprintf("%p", &b2[1])[2:], 16)
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if a1 != a0 + 2 {
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if status == 0 {
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fmt.Println("FAIL")
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status = 1
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}
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if report {
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fmt.Println("alignment should be 2, is", a1-a0)
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}
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}
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var b4 [10]T4
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a0, _ = strconv.Btoui64(fmt.Sprintf("%p", &b4[0])[2:], 16)
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a1, _ = strconv.Btoui64(fmt.Sprintf("%p", &b4[1])[2:], 16)
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if a1 != a0 + 4 {
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if status == 0 {
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fmt.Println("FAIL")
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status = 1
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}
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if report {
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fmt.Println("alignment should be 4, is", a1-a0)
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}
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}
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os.Exit(status)
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}
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