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Issue 2157041: code review 2157041: test: remove semiocolons. (Closed)
Patch Set: code review 2157041: test: remove semiocolons. Created 14 years, 7 months ago
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1 // [ $GOOS != nacl ] || exit 0 # do not bother on NaCl 1 // [ $GOOS != nacl ] || exit 0 # do not bother on NaCl
2 // $G $D/$F.go && $L $F.$A && 2 // $G $D/$F.go && $L $F.$A &&
3 // ((! sh -c ./$A.out) >/dev/null 2>&1 || echo BUG: should fail) 3 // ((! sh -c ./$A.out) >/dev/null 2>&1 || echo BUG: should fail)
4 4
5 // Copyright 2009 The Go Authors. All rights reserved. 5 // Copyright 2009 The Go Authors. All rights reserved.
6 // Use of this source code is governed by a BSD-style 6 // Use of this source code is governed by a BSD-style
7 // license that can be found in the LICENSE file. 7 // license that can be found in the LICENSE file.
8 8
9 package main 9 package main
10 10
11 import "unsafe" 11 import "unsafe"
12 12
13 var dummy [512<<20]byte;» // give us a big address space 13 var dummy [512<<20]byte»// give us a big address space
14 type T struct { 14 type T struct {
15 » x [256<<20] byte; 15 » x [256<<20] byte
16 » i int; 16 » i int
17 } 17 }
18 18
19 func main() { 19 func main() {
20 // the test only tests what we intend to test 20 // the test only tests what we intend to test
21 // if dummy starts in the first 256 MB of memory. 21 // if dummy starts in the first 256 MB of memory.
22 // otherwise there might not be anything mapped 22 // otherwise there might not be anything mapped
23 // at the address that might be accidentally 23 // at the address that might be accidentally
24 // dereferenced below. 24 // dereferenced below.
25 if uintptr(unsafe.Pointer(&dummy)) > 256<<20 { 25 if uintptr(unsafe.Pointer(&dummy)) > 256<<20 {
26 » » panic("dummy too far out"); 26 » » panic("dummy too far out")
27 } 27 }
28 28
29 // The problem here is that indexing into t with a large 29 // The problem here is that indexing into t with a large
30 // enough index can jump out of the unmapped section 30 // enough index can jump out of the unmapped section
31 // at the beginning of memory and into valid memory. 31 // at the beginning of memory and into valid memory.
32 // We require the pointer dereference to check. 32 // We require the pointer dereference to check.
33 » var t *T; 33 » var t *T
34 » println(t.i);» // should crash 34 » println(t.i)» // should crash
35 } 35 }
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