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
|
//===----------------------------------------------------------------------===//
//
// This source file is part of the Swift Atomics open source project
//
// Copyright (c) 2020 Apple Inc. and the Swift project authors
// Licensed under Apache License v2.0 with Runtime Library Exception
//
// See https://swift.org/LICENSE.txt for license information
// See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
//
//===----------------------------------------------------------------------===//
// RUN: %empty-directory(%t)
// RUN: %gyb %s -o %t/UnsafeAtomicInitializers.swift
// RUN: %line-directive %t/UnsafeAtomicInitializers.swift -- %target-swift-frontend -typecheck -verify %t/UnsafeAtomicInitializers.swift
%{
from gyb_utils import autogenerated_warning
types = [
# id type initial
("Int", "Int", "0"),
("Int64", "Int64", "0"),
("Int32", "Int32", "0"),
("Int16", "Int16", "0"),
("Int8", "Int8", "0"),
("UInt", "UInt", "0"),
("UInt64", "UInt64", "0"),
("UInt32", "UInt32", "0"),
("UInt16", "UInt16", "0"),
("UInt8", "UInt8", "0"),
# id type initial
("URP", "UnsafeRawPointer", "UnsafeRawPointer(UnsafeMutableRawPointer.allocate(byteCount: 8, alignment: 8))"),
("UP", "UnsafePointer<Bar>", "UnsafePointer(UnsafeMutablePointer<Bar>.allocate(capacity: 1))"),
("UMRP", "UnsafeMutableRawPointer", ".allocate(byteCount: 8, alignment: 8)"),
("UMP", "UnsafeMutablePointer<Bar>", ".allocate(capacity: 1)"),
("Unmanaged", "Unmanaged<Foo>", "Unmanaged.passRetained(Foo())"),
# id type initial
("URPOpt", "UnsafeRawPointer?", "nil"),
("UPOpt", "UnsafePointer<Bar>?", "nil"),
("UMRPOpt", "UnsafeMutableRawPointer?", "nil"),
("UMPOpt", "UnsafeMutablePointer<Bar>?", "nil"),
("UnmanagedOpt", "Unmanaged<Foo>?", "nil"),
]
}%
${autogenerated_warning()}
import Atomics
class Foo {
var value = 0
}
struct Bar {
var value = 0
}
% for (id, type, initial) in types:
func test_${id}() -> UnsafeAtomic<${type}> {
var storage = UnsafeAtomic<${type}>.Storage(${initial})
let atomic = UnsafeAtomic<${type}>(at: &storage) // expected-warning {{inout expression creates a temporary pointer, but argument 'at' should be a pointer that outlives the call to 'init(at:)'}}
// expected-note@-1 {{implicit argument conversion from 'UnsafeAtomic<${type}>.Storage' to 'UnsafeMutablePointer<UnsafeAtomic<${type}>.Storage>' produces a pointer valid only for the duration of the call to 'init(at:)'}}
// expected-note@-2 {{use 'withUnsafeMutablePointer' in order to explicitly convert argument to pointer valid for a defined scope}}
return atomic
}
% end
func test_UnsafeAtomicLazyReference() -> UnsafeAtomicLazyReference<Foo> {
var value = UnsafeAtomicLazyReference<Foo>.Storage()
let atomic = UnsafeAtomicLazyReference(at: &value) // expected-warning {{inout expression creates a temporary pointer, but argument 'at' should be a pointer that outlives the call to 'init(at:)'}}
// expected-note@-1 {{implicit argument conversion from 'UnsafeAtomicLazyReference<Foo>.Storage' to 'UnsafeMutablePointer<UnsafeAtomicLazyReference<Foo>.Storage>' produces a pointer valid only for the duration of the call to 'init(at:)'}}
// expected-note@-2 {{use 'withUnsafeMutablePointer' in order to explicitly convert argument to pointer valid for a defined scope}}
return atomic
}
class BrokenAtomicCounter { // THIS IS BROKEN; DO NOT USE
private var _storage = UnsafeAtomic<Int>.Storage(0)
private var _value: UnsafeAtomic<Int>?
init() {
// This escapes the ephemeral pointer generated by the inout expression,
// so it leads to undefined behavior when the pointer gets dereferenced
// in the atomic operations below. DO NOT DO THIS.
_value = UnsafeAtomic(at: &_storage) // expected-warning {{inout expression creates a temporary pointer, but argument 'at' should be a pointer that outlives the call to 'init(at:)'}}
// expected-note@-1 {{implicit argument conversion from 'UnsafeAtomic<Int>.Storage' to 'UnsafeMutablePointer<UnsafeAtomic<Int>.Storage>' produces a pointer valid only for the duration of the call to 'init(at:)'}}
// expected-note@-2 {{use 'withUnsafeMutablePointer' in order to explicitly convert argument to pointer valid for a defined scope}}
}
func increment() {
_value!.wrappingIncrement(by: 1, ordering: .relaxed)
}
func get() -> Int {
_value!.load(ordering: .relaxed)
}
}
struct AtomicCounter {
typealias Value = Int
typealias Header = UnsafeAtomic<Value>.Storage
class Buffer: ManagedBuffer<Header, Void> {
deinit {
withUnsafeMutablePointerToHeader { header in
_ = header.pointee.dispose()
}
}
}
let buffer: Buffer
init() {
buffer = Buffer.create(minimumCapacity: 0) { _ in
Header(0)
} as! Buffer
}
private func _withAtomicPointer<R>(
_ body: (UnsafeAtomic<Int>) throws -> R
) rethrows -> R {
try buffer.withUnsafeMutablePointerToHeader { header in
try body(UnsafeAtomic<Int>(at: header))
}
}
func increment() {
_withAtomicPointer { $0.wrappingIncrement(ordering: .relaxed) }
}
func load() -> Int {
_withAtomicPointer { $0.load(ordering: .relaxed) }
}
}
struct AtomicUnmanagedRef<Instance: AnyObject> {
typealias Value = Unmanaged<Instance>?
typealias Header = UnsafeAtomic<Value>.Storage
class Buffer: ManagedBuffer<Header, Void> {
deinit {
withUnsafeMutablePointerToHeader { header in
_ = header.pointee.dispose()
}
}
}
let buffer: Buffer
init() {
buffer = Buffer.create(minimumCapacity: 0) { _ in
Header(nil)
} as! Buffer
}
private func _withAtomicPointer<R>(
_ body: (UnsafeAtomic<Value>) throws -> R
) rethrows -> R {
try buffer.withUnsafeMutablePointerToHeader { header in
try body(UnsafeAtomic<Value>(at: header))
}
}
func store(_ desired: Value) {
_withAtomicPointer { $0.store(desired, ordering: .sequentiallyConsistent) }
}
func load() -> Value {
_withAtomicPointer { $0.load(ordering: .sequentiallyConsistent) }
}
}
|
