summaryrefslogtreecommitdiffstats
path: root/test/recover3.go
blob: 1b26cb36367dcdd206b8b30dd5aad3e371fb9137 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
// run

// Copyright 2010 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.

// Test recovering from runtime errors.

package main

import (
	"runtime"
	"strings"
)

var didbug bool

func bug() {
	if didbug {
		return
	}
	println("BUG")
	didbug = true
}

func check(name string, f func(), err string) {
	defer func() {
		v := recover()
		if v == nil {
			bug()
			println(name, "did not panic")
			return
		}
		runt, ok := v.(runtime.Error)
		if !ok {
			bug()
			println(name, "panicked but not with runtime.Error")
			return
		}
		s := runt.Error()
		if strings.Index(s, err) < 0 {
			bug()
			println(name, "panicked with", s, "not", err)
			return
		}
	}()

	f()
}

func main() {
	var x int
	var x64 int64
	var p *[10]int
	var q *[10000]int
	var i int

	check("int-div-zero", func() { println(1 / x) }, "integer divide by zero")
	check("int64-div-zero", func() { println(1 / x64) }, "integer divide by zero")

	check("nil-deref", func() { println(p[0]) }, "nil pointer dereference")
	check("nil-deref-1", func() { println(p[1]) }, "nil pointer dereference")
	check("nil-deref-big", func() { println(q[5000]) }, "nil pointer dereference")

	i = 99999
	var sl []int
	p1 := new([10]int)
	check("array-bounds", func() { println(p1[i]) }, "index out of range")
	check("slice-bounds", func() { println(sl[i]) }, "index out of range")

	var inter interface{}
	inter = 1
	check("type-concrete", func() { println(inter.(string)) }, "int, not string")
	check("type-interface", func() { println(inter.(m)) }, "missing method m")

	if didbug {
		panic("recover3")
	}
}

type m interface {
	m()
}