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// run
// Copyright 2019 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.
// This test makes sure the text output for bounds check failures is as expected.
package main
import (
"fmt"
"os"
"runtime"
"text/tabwriter"
)
// Testing with length 3 slices, arrays, and strings.
// A large (>1<<32) value is included to test 32-bit platforms.
var indexes = []uint64{0, 2, 3, 1<<32 - 1, 1<<64 - 1}
var slices = []uint64{0, 3, 4, 1<<32 - 1, 1<<64 - 1}
var w *tabwriter.Writer
func main() {
w = tabwriter.NewWriter(os.Stdout, 0, 0, 1, ' ', tabwriter.AlignRight)
defer w.Flush()
doIndex()
doSlice()
doSlice3()
}
func doIndex() {
a := []int{1, 2, 3}
for _, i := range indexes {
printPanic(fmt.Sprintf("slice[%d]", i), func() {
_ = a[i]
})
}
b := [3]int{1, 2, 3}
for _, i := range indexes {
printPanic(fmt.Sprintf("array[%d]", i), func() {
_ = b[i]
})
}
c := "123"
for _, i := range indexes {
printPanic(fmt.Sprintf("string[%d]", i), func() {
_ = c[i]
})
}
}
func doSlice() {
a := []int{1, 2, 3}
for _, i := range slices {
for _, j := range slices {
printPanic(fmt.Sprintf("slice[%d:%d]", i, j), func() {
_ = a[i:j]
})
}
}
b := [3]int{1, 2, 3}
for _, i := range slices {
for _, j := range slices {
printPanic(fmt.Sprintf("array[%d:%d]", i, j), func() {
_ = b[i:j]
})
}
}
c := "123"
for _, i := range slices {
for _, j := range slices {
printPanic(fmt.Sprintf("string[%d:%d]", i, j), func() {
_ = c[i:j]
})
}
}
}
func doSlice3() {
a := []int{1, 2, 3}
for _, i := range slices {
for _, j := range slices {
for _, k := range slices {
printPanic(fmt.Sprintf("slice[%d:%d:%d]", i, j, k), func() {
_ = a[i:j:k]
})
}
}
}
b := [3]int{1, 2, 3}
for _, i := range slices {
for _, j := range slices {
for _, k := range slices {
printPanic(fmt.Sprintf("array[%d:%d:%d]", i, j, k), func() {
_ = b[i:j:k]
})
}
}
}
}
func printPanic(msg string, f func()) {
defer func() {
res := "no panic"
if e := recover(); e != nil {
res = e.(runtime.Error).Error()
}
fmt.Fprintf(w, "%s\t %s\n", msg, res)
}()
f()
}