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
9package main
10
11import (
12	"runtime"
13	"strings"
14)
15
16var didbug bool
17
18func bug() {
19	if didbug {
20		return
21	}
22	println("BUG")
23	didbug = true
24}
25
26func 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
51func 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
81type m interface {
82	m()
83}
84