1 // run 2 3 // Copyright 2013 The Go Authors. All rights reserved. 4 // Use of this source code is governed by a BSD-style 5 // license that can be found in the LICENSE file. 6 7 package main 8 9 import ( 10 "strings" 11 "unsafe" 12 ) 13 14 type T []int 15 16 func main() { 17 n := -1 18 shouldPanic("len out of range", func() { _ = make(T, n) }) 19 shouldPanic("cap out of range", func() { _ = make(T, 0, n) }) 20 shouldPanic("len out of range", func() { _ = make(T, int64(n)) }) 21 shouldPanic("cap out of range", func() { _ = make(T, 0, int64(n)) }) 22 var t *byte 23 if unsafe.Sizeof(t) == 8 { 24 n = 1 << 20 25 n <<= 20 26 shouldPanic("len out of range", func() { _ = make(T, n) }) 27 shouldPanic("cap out of range", func() { _ = make(T, 0, n) }) 28 n <<= 20 29 shouldPanic("len out of range", func() { _ = make(T, n) }) 30 shouldPanic("cap out of range", func() { _ = make(T, 0, n) }) 31 } else { 32 n = 1<<31 - 1 33 shouldPanic("len out of range", func() { _ = make(T, n) }) 34 shouldPanic("cap out of range", func() { _ = make(T, 0, n) }) 35 shouldPanic("len out of range", func() { _ = make(T, int64(n)) }) 36 shouldPanic("cap out of range", func() { _ = make(T, 0, int64(n)) }) 37 } 38 } 39 40 func shouldPanic(str string, f func()) { 41 defer func() { 42 err := recover() 43 if err == nil { 44 panic("did not panic") 45 } 46 s := err.(error).Error() 47 if !strings.Contains(s, str) { 48 panic("got panic " + s + ", want " + str) 49 } 50 }() 51 52 f() 53 } 54
