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https://github.com/golang/go
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426275d702
The gccgo compiler is smart enough to not make something which is not used. Use global variables to defeat this optimization. R=rsc CC=golang-dev https://golang.org/cl/2129041
102 lines
1.8 KiB
Go
102 lines
1.8 KiB
Go
// $G $D/$F.go && $L $F.$A && ./$A.out
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// Copyright 2010 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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// http://code.google.com/p/go/issues/detail?id=589
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package main
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import "unsafe"
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var bug = false
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var minus1 = -1
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var big int64 = 10 | 1<<32
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var g1 []int
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func shouldfail(f func(), desc string) {
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defer func() { recover() }()
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f()
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if !bug {
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println("BUG")
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bug = true
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}
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println("didn't crash: ", desc)
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}
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func badlen() {
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g1 = make([]int, minus1)
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}
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func biglen() {
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g1 = make([]int, big)
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}
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func badcap() {
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g1 = make([]int, 10, minus1)
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}
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func badcap1() {
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g1 = make([]int, 10, 5)
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}
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func bigcap() {
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g1 = make([]int, 10, big)
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}
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const (
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addrBits = 8*uint(unsafe.Sizeof((*byte)(nil)))
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sh = addrBits/2 - 2
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)
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var g2 [][1<<sh][1<<sh]byte
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func overflow() {
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g2 = make([][1<<sh][1<<sh]byte, 64)
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}
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var g3 map[int]int
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func badmapcap() {
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g3 = make(map[int]int, minus1)
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}
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func bigmapcap() {
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g3 = make(map[int]int, big)
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}
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var g4 chan int
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func badchancap() {
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g4 = make(chan int, minus1)
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}
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func bigchancap() {
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g4 = make(chan int, big)
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}
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var g5 chan [1<<15]byte
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func overflowchan() {
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if addrBits == 32 {
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g5 = make(chan [1<<15]byte, 1<<20)
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} else {
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// cannot overflow on 64-bit, because
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// int is 32 bits and max chan value size
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// in the implementation is 64 kB.
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panic(1)
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}
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}
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func main() {
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shouldfail(badlen, "badlen")
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shouldfail(biglen, "biglen")
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shouldfail(badcap, "badcap")
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shouldfail(badcap1, "badcap1")
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shouldfail(bigcap, "bigcap")
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shouldfail(overflow, "overflow")
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shouldfail(badmapcap, "badmapcap")
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shouldfail(bigmapcap, "bigmapcap")
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shouldfail(badchancap, "badchancap")
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shouldfail(bigchancap, "bigchancap")
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shouldfail(overflowchan, "overflowchan")
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}
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