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
|
// RUN: %target-swift-frontend %s -emit-sil \
// RUN: -o /dev/null \
// RUN: -verify \
// RUN: -sil-verify-all \
// RUN: -module-name test \
// RUN: -enable-experimental-feature NonescapableTypes
// REQUIRES: asserts
// REQUIRES: swift_in_compiler
// Some container-ish thing.
struct CN: ~Copyable {
let p: UnsafeRawPointer
let i: Int
}
// Some Bufferview-ish thing.
struct BV : ~Escapable {
let p: UnsafeRawPointer
let i: Int
public var isEmpty: Bool { i == 0 }
@_unsafeNonescapableResult
init(_ p: UnsafeRawPointer, _ i: Int) {
self.p = p
self.i = i
}
init(_ cn: borrowing CN) {
self.p = cn.p
self.i = cn.i
}
}
// Some MutableBufferview-ish thing.
struct MBV : ~Escapable, ~Copyable {
let p: UnsafeRawPointer
let i: Int
@_unsafeNonescapableResult
init(_ p: UnsafeRawPointer, _ i: Int) {
self.p = p
self.i = i
}
// Requires a borrow.
borrowing func getBV() -> dependsOn(self) BV {
BV(p, i)
}
}
// Nonescapable wrapper.
struct NEBV : ~Escapable {
var bv: BV
init(_ bv: consuming BV) {
self.bv = bv
}
}
// Propagate a borrow.
func bv_get_borrow(container: borrowing MBV) -> dependsOn(container) BV {
container.getBV()
}
// Copy a borrow.
func bv_get_copy(container: borrowing MBV) -> dependsOn(container) BV {
return container.getBV()
}
// Recognize nested accesses as part of the same dependence scope.
func bv_get_mutate(container: inout MBV) -> dependsOn(container) BV {
container.getBV()
}
// Create and decompose a nonescapable aggregate.
func ne_wrap_and_extract_member(cn: borrowing CN) -> dependsOn(scoped cn) BV {
let bv = BV(cn)
let ne = NEBV(bv)
return ne.bv
}
|
