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// https://golang.org/issue/589
8
9package main
10
11import "unsafe"
12
13var bug = false
14
15var minus1 = -1
16var five = 5
17var big int64 = 10 | 1<<46
18
19type block [1 << 19]byte
20
21var g1 []block
22
23func shouldfail(f func(), desc string) {
24	defer func() { recover() }()
25	f()
26	if !bug {
27		println("BUG")
28		bug = true
29	}
30	println("didn't crash: ", desc)
31}
32
33func badlen() {
34	g1 = make([]block, minus1)
35}
36
37func biglen() {
38	g1 = make([]block, big)
39}
40
41func badcap() {
42	g1 = make([]block, 10, minus1)
43}
44
45func badcap1() {
46	g1 = make([]block, 10, five)
47}
48
49func bigcap() {
50	g1 = make([]block, 10, big)
51}
52
53type cblock [1<<16 - 1]byte
54
55var g4 chan cblock
56
57func badchancap() {
58	g4 = make(chan cblock, minus1)
59}
60
61func bigchancap() {
62	g4 = make(chan cblock, big)
63}
64
65func overflowchan() {
66	const ptrSize = unsafe.Sizeof(uintptr(0))
67	g4 = make(chan cblock, 1<<(30*(ptrSize/4)))
68}
69
70func main() {
71	shouldfail(badlen, "badlen")
72	shouldfail(biglen, "biglen")
73	shouldfail(badcap, "badcap")
74	shouldfail(badcap1, "badcap1")
75	shouldfail(bigcap, "bigcap")
76	shouldfail(badchancap, "badchancap")
77	shouldfail(bigchancap, "bigchancap")
78	shouldfail(overflowchan, "overflowchan")
79}
80