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
|
//===----------------------------------------------------------------------===//
//
// This source file is part of the Swift.org open source project
//
// Copyright (c) 2021-2022 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
//
//===----------------------------------------------------------------------===//
import XCTest
@testable import Prototypes
import _RegexParser
enum Event: UInt64, Hashable {
case authenticate = 0
case authorize
case use
// Various paired operations
case acquire
case release
case lock
case unlock
// Multi-phase and/or scoped operations
case enterPhase1
case enterPhase2
case enterPhase3
case exitPhase1
case exitPhase2
case exitPhase3
}
class PTCaRetTests: XCTestCase {
typealias Formula = PTCaRet<Event>.Formula
let enterPhase1 = Formula.event(.enterPhase1)
let acquire = Formula.event(.acquire)
let release = Formula.event(.release)
func testHappensBefore() {
}
func testDirectCall() {
// Function `f` can only be called directly by `g`
//
// call_f → @_c call_g
//
// Note: a beginSpecific would be clearer
let f = Formula.implies(
.callSpecific("F"),
.atFunctionCall(.callSpecific("G")))
_ = f
// Function `f` can only be called directly or
// indirectly by `g`, i.e. `g` must be somewhere on the
// call stack.
//
//
//
// TODO: stackSometime()
}
func testAcquireRelease() {
// A certain resource acquired during this function's
// execution must be released by its end of execution.
//
// end → (¬acquire S̅ begin ∨ ¬(¬release S̅ acquire))
let req = Formula.abstractRequirement(
acquire, requiresEventually: release,
since: .begin, triggeredBy: .end)
_ = req
}
func testComplex() {
/// From "Synthesizing Monitors for Safety Properties - This
/// Time With Calls and Returns " by Rosu et al.
///
/// Suppose that a program carries out a critical multi-phase task and
/// the following safety properties must hold when execution enters the
/// second phase:
///
/// 1. Execution entered the first phase within the same procedure
/// 2. Resource acquired within same procedure since first phase must be released
/// 3. Caller of current procedure must have had approval for the second phase
/// 4. Task is executed directly or indirectly by the procedure safe exec.
let rule_1 = Formula.abstractSometime(
enterPhase1, since: .begin)
let rule_2 = Formula.or(
.never(acquire, since: enterPhase1),
.sometime(release, since: acquire))
// TODO: ...
(_, _) = (rule_1, rule_2)
}
}
|
