1 // run 2 3 // Copyright 2010 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 // Test recovering from runtime errors. 8 9 package main 10 11 import ( 12 "runtime" 13 "strings" 14 ) 15 16 var didbug bool 17 18 func bug() { 19 if didbug { 20 return 21 } 22 println("BUG") 23 didbug = true 24 } 25 26 func check(name string, f func(), err string) { 27 defer func() { 28 v := recover() 29 if v == nil { 30 bug() 31 println(name, "did not panic") 32 return 33 } 34 runt, ok := v.(runtime.Error) 35 if !ok { 36 bug() 37 println(name, "panicked but not with runtime.Error") 38 return 39 } 40 s := runt.Error() 41 if strings.Index(s, err) < 0 { 42 bug() 43 println(name, "panicked with", s, "not", err) 44 return 45 } 46 }() 47 48 f() 49 } 50 51 func main() { 52 var x int 53 var x64 int64 54 var p *[10]int 55 var q *[10000]int 56 var i int 57 58 check("int-div-zero", func() { println(1 / x) }, "integer divide by zero") 59 check("int64-div-zero", func() { println(1 / x64) }, "integer divide by zero") 60 61 check("nil-deref", func() { println(p[0]) }, "nil pointer dereference") 62 check("nil-deref-1", func() { println(p[1]) }, "nil pointer dereference") 63 check("nil-deref-big", func() { println(q[5000]) }, "nil pointer dereference") 64 65 i = 99999 66 var sl []int 67 p1 := new([10]int) 68 check("array-bounds", func() { println(p1[i]) }, "index out of range") 69 check("slice-bounds", func() { println(sl[i]) }, "index out of range") 70 71 var inter interface{} 72 inter = 1 73 check("type-concrete", func() { println(inter.(string)) }, "int, not string") 74 check("type-interface", func() { println(inter.(m)) }, "missing method m") 75 76 if didbug { 77 panic("recover3") 78 } 79 } 80 81 type m interface { 82 m() 83 } 84
