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
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
|
// RUN: %empty-directory(%t)
//
// RUN: %target-clang -x c %S/Inputs/retain_release_wrappers.c -c -o %t/retain_release_wrappers.o
// RUN: %target-build-swift -enable-experimental-feature Extern %t/retain_release_wrappers.o %s -o %t/refcount_overflow
// RUN: %target-codesign %t/refcount_overflow
// RUN: %target-run %t/refcount_overflow
// REQUIRES: executable_test
// UNSUPPORTED: use_os_stdlib
// UNSUPPORTED: back_deployment_runtime
import StdlibUnittest
// Declarations of runtime ABI refcounting functions.
@_extern(c)
func wrapper_swift_retain_n(_ obj: UnsafeMutableRawPointer, _ n: UInt32) -> UnsafeMutableRawPointer
@_extern(c)
func wrapper_swift_release_n(_ obj: UnsafeMutableRawPointer, _ n: UInt32)
@_extern(c)
func wrapper_swift_nonatomic_retain_n(_ obj: UnsafeMutableRawPointer, _ n: UInt32) -> UnsafeMutableRawPointer
@_extern(c)
func wrapper_swift_nonatomic_release_n(_ obj: UnsafeMutableRawPointer, _ n: UInt32)
@_extern(c)
func wrapper_swift_unownedRetain_n(_ obj: UnsafeMutableRawPointer, _ n: UInt32) -> UnsafeMutableRawPointer
@_extern(c)
func wrapper_swift_unownedRelease_n(_ obj: UnsafeMutableRawPointer, _ n: UInt32)
@_extern(c)
func wrapper_swift_nonatomic_unownedRetain_n(_ obj: UnsafeMutableRawPointer, _ n: UInt32) -> UnsafeMutableRawPointer
@_extern(c)
func wrapper_swift_nonatomic_unownedRelease_n(_ obj: UnsafeMutableRawPointer, _ n: UInt32)
// Maximum legal retain count.
// 30 bits of extra retain count, plus 1 for the implicit retain.
let maxRC = (1 as UInt32) << 30
// Maximum retain count that fits inline on 32-bit.
let maxInlineRC32 = (1 as UInt32) << 22
// Maximum unowned count that fits inline on 32-bit.
let maxInlineURC32 = (1 as UInt32) << 7
var didDeinit = false
class C {
deinit {
didDeinit = true
}
}
// Get a pointer to an object with a single strong retain count. This prevents
// ARC from doing different things to us depending on optimization level.
func getTestObject() -> UnsafeMutableRawPointer {
let obj = C()
let ptr = unsafeBitCast(obj, to: UnsafeMutableRawPointer.self)
_ = wrapper_swift_retain_n(ptr, 1)
return ptr
}
// Balance the retain from getTestObject.
func releaseTestObject(_ obj: UnsafeMutableRawPointer) {
wrapper_swift_release_n(obj, 1)
}
let RefcountOverflowTests = TestSuite("RefcountOverflow")
RefcountOverflowTests.test("retain") {
do {
let obj = getTestObject()
_ = wrapper_swift_retain_n(obj, maxRC - 1)
wrapper_swift_release_n(obj, maxRC - 1)
releaseTestObject(obj)
}
expectTrue(didDeinit)
didDeinit = false
}
RefcountOverflowTests.test("retain2") {
do {
let obj = getTestObject()
_ = wrapper_swift_retain_n(obj, maxRC - 1)
wrapper_swift_release_n(obj, maxRC - 1)
releaseTestObject(obj)
}
expectTrue(didDeinit)
didDeinit = false
}
RefcountOverflowTests.test("nonatomic_retain") {
do {
let obj = getTestObject()
_ = wrapper_swift_nonatomic_retain_n(obj, maxRC - 1)
wrapper_swift_nonatomic_release_n(obj, maxRC - 1)
releaseTestObject(obj)
}
expectTrue(didDeinit)
didDeinit = false
}
RefcountOverflowTests.test("retain one by one") {
do {
// Retain to near maxInlineRC32, then +1 over the limit.
let obj = getTestObject()
_ = wrapper_swift_retain_n(obj, maxInlineRC32 - 100)
for _ in 0..<200 {
_ = wrapper_swift_retain_n(obj, 1)
}
for _ in 0..<200 {
wrapper_swift_release_n(obj, 1)
}
wrapper_swift_release_n(obj, maxInlineRC32 - 100)
releaseTestObject(obj)
}
expectTrue(didDeinit)
didDeinit = false
}
RefcountOverflowTests.test("nonatomic_retain one by one") {
do {
// Retain to near maxInlineRC32, then +1 over the limit.
let obj = getTestObject()
_ = wrapper_swift_nonatomic_retain_n(obj, maxInlineRC32 - 100)
for _ in 0..<200 {
_ = wrapper_swift_nonatomic_retain_n(obj, 1)
}
for _ in 0..<200 {
wrapper_swift_nonatomic_release_n(obj, 1)
}
wrapper_swift_nonatomic_release_n(obj, maxInlineRC32 - 100)
releaseTestObject(obj)
}
expectTrue(didDeinit)
didDeinit = false
}
RefcountOverflowTests.test("unownedRetain") {
do {
let obj = getTestObject()
_ = wrapper_swift_unownedRetain_n(obj, maxRC - 1)
wrapper_swift_unownedRelease_n(obj, maxRC - 1)
releaseTestObject(obj)
}
expectTrue(didDeinit)
didDeinit = false
}
RefcountOverflowTests.test("nonatomic_unownedRetain") {
do {
let obj = getTestObject()
_ = wrapper_swift_nonatomic_unownedRetain_n(obj, maxRC - 1)
wrapper_swift_nonatomic_unownedRelease_n(obj, maxRC - 1)
releaseTestObject(obj)
}
expectTrue(didDeinit)
didDeinit = false
}
RefcountOverflowTests.test("unownedRetain one by one") {
do {
let obj = getTestObject()
let n = maxInlineURC32 * 2
for _ in 0..<n {
_ = wrapper_swift_unownedRetain_n(obj, 1)
}
for _ in 0..<n {
wrapper_swift_unownedRelease_n(obj, 1)
}
releaseTestObject(obj)
}
expectTrue(didDeinit)
didDeinit = false
}
RefcountOverflowTests.test("nonatomic_unownedRetain one by one") {
do {
let obj = getTestObject()
let n = maxInlineURC32 * 2
for _ in 0..<n {
_ = wrapper_swift_nonatomic_unownedRetain_n(obj, 1)
}
for _ in 0..<n {
wrapper_swift_nonatomic_unownedRelease_n(obj, 1)
}
releaseTestObject(obj)
}
expectTrue(didDeinit)
didDeinit = false
}
RefcountOverflowTests.test("unownedRetain moderate increment") {
do {
let obj = getTestObject()
let n = maxInlineURC32 * 3 / 4
_ = wrapper_swift_unownedRetain_n(obj, n)
_ = wrapper_swift_unownedRetain_n(obj, n)
wrapper_swift_unownedRelease_n(obj, n)
wrapper_swift_unownedRelease_n(obj, n)
releaseTestObject(obj)
}
expectTrue(didDeinit)
didDeinit = false
}
RefcountOverflowTests.test("nonatomic_unownedRetain moderate increment") {
do {
let obj = getTestObject()
let n = maxInlineURC32 * 3 / 4
_ = wrapper_swift_nonatomic_unownedRetain_n(obj, n)
_ = wrapper_swift_nonatomic_unownedRetain_n(obj, n)
wrapper_swift_nonatomic_unownedRelease_n(obj, n)
wrapper_swift_nonatomic_unownedRelease_n(obj, n)
releaseTestObject(obj)
}
expectTrue(didDeinit)
didDeinit = false
}
runAllTests()
|
