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
|
/*
This source file is part of the Swift System open source project
Copyright (c) 2020 Apple Inc. and the Swift System project authors
Licensed under Apache License v2.0 with Runtime Library Exception
See https://swift.org/LICENSE.txt for license information
*/
// Internal wrappers and typedefs which help reduce #if littering in System's
// code base.
// TODO: Should CSystem just include all the header files we need?
#if SYSTEM_PACKAGE_DARWIN
import Darwin
#elseif os(Windows)
import CSystem
import ucrt
#elseif canImport(Glibc)
@_implementationOnly import CSystem
import Glibc
#elseif canImport(Musl)
@_implementationOnly import CSystem
import Musl
#else
#error("Unsupported Platform")
#endif
internal typealias _COffT = off_t
// MARK: syscalls and variables
#if SYSTEM_PACKAGE_DARWIN
internal var system_errno: CInt {
get { Darwin.errno }
set { Darwin.errno = newValue }
}
#elseif os(Windows)
internal var system_errno: CInt {
get {
var value: CInt = 0
// TODO(compnerd) handle the error?
_ = ucrt._get_errno(&value)
return value
}
set {
_ = ucrt._set_errno(newValue)
}
}
#elseif canImport(Glibc)
internal var system_errno: CInt {
get { Glibc.errno }
set { Glibc.errno = newValue }
}
#elseif canImport(Musl)
internal var system_errno: CInt {
get { Musl.errno }
set { Musl.errno = newValue }
}
#endif
// MARK: C stdlib decls
// Convention: `system_foo` is system's wrapper for `foo`.
internal func system_strerror(_ __errnum: Int32) -> UnsafeMutablePointer<Int8>! {
strerror(__errnum)
}
internal func system_strlen(_ s: UnsafePointer<Int8>) -> Int {
strlen(s)
}
// Convention: `system_platform_foo` is a
// platform-representation-abstracted wrapper around `foo`-like functionality.
// Type and layout differences such as the `char` vs `wchar` are abstracted.
//
// strlen for the platform string
internal func system_platform_strlen(_ s: UnsafePointer<CInterop.PlatformChar>) -> Int {
#if os(Windows)
return wcslen(s)
#else
return strlen(s)
#endif
}
// Interop between String and platfrom string
extension String {
internal func _withPlatformString<Result>(
_ body: (UnsafePointer<CInterop.PlatformChar>) throws -> Result
) rethrows -> Result {
// Need to #if because CChar may be signed
#if os(Windows)
return try withCString(encodedAs: CInterop.PlatformUnicodeEncoding.self, body)
#else
return try withCString(body)
#endif
}
internal init?(_platformString platformString: UnsafePointer<CInterop.PlatformChar>) {
// Need to #if because CChar may be signed
#if os(Windows)
guard let strRes = String.decodeCString(
platformString,
as: CInterop.PlatformUnicodeEncoding.self,
repairingInvalidCodeUnits: false
) else { return nil }
assert(strRes.repairsMade == false)
self = strRes.result
return
#else
self.init(validatingUTF8: platformString)
#endif
}
internal init(
_errorCorrectingPlatformString platformString: UnsafePointer<CInterop.PlatformChar>
) {
// Need to #if because CChar may be signed
#if os(Windows)
let strRes = String.decodeCString(
platformString,
as: CInterop.PlatformUnicodeEncoding.self,
repairingInvalidCodeUnits: true)
self = strRes!.result
return
#else
self.init(cString: platformString)
#endif
}
}
// TLS
#if os(Windows)
internal typealias _PlatformTLSKey = DWORD
#else
internal typealias _PlatformTLSKey = pthread_key_t
#endif
internal func makeTLSKey() -> _PlatformTLSKey {
#if os(Windows)
let raw: DWORD = FlsAlloc(nil)
if raw == FLS_OUT_OF_INDEXES {
fatalError("Unable to create key")
}
return raw
#else
var raw = pthread_key_t()
guard 0 == pthread_key_create(&raw, nil) else {
fatalError("Unable to create key")
}
return raw
#endif
}
internal func setTLS(_ key: _PlatformTLSKey, _ p: UnsafeMutableRawPointer?) {
#if os(Windows)
guard FlsSetValue(key, p) else {
fatalError("Unable to set TLS")
}
#else
guard 0 == pthread_setspecific(key, p) else {
fatalError("Unable to set TLS")
}
#endif
}
internal func getTLS(_ key: _PlatformTLSKey) -> UnsafeMutableRawPointer? {
#if os(Windows)
return FlsGetValue(key)
#else
return pthread_getspecific(key)
#endif
}
|
