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
|
//===----------------------------------------------------------------------===//
//
// This source file is part of the Swift.org open source project
//
// Copyright (c) 2014 - 2023 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
//
//===----------------------------------------------------------------------===//
@_spi(Testing) import SwiftSyntax
import XCTest
final class MemoryLayoutTest: XCTestCase {
func testMemoryLayouts() throws {
#if !arch(x86_64) && !arch(arm64)
throw XCTSkip("Only runs on x86_64 and arm64")
#endif
/// This test result is just for tracking the memory footprint of syntax nodes,
/// and they are totally informative purpose. Although we want to keep the
/// numbers as low as possible, nothing should rely on them, and are not hard
/// limits in any way.
/// If this fails, just update the numbers.
let expected: [String: SyntaxMemoryLayout.Value] = [
"RawSyntaxData.Layout": .init(size: 41, stride: 48, alignment: 8),
"RawSyntaxData.ParsedToken": .init(size: 44, stride: 48, alignment: 8),
"RawSyntaxData.MaterializedToken": .init(size: 52, stride: 56, alignment: 8),
"RawSyntaxData": .init(size: 64, stride: 64, alignment: 8),
"RawSyntax?": .init(size: 8, stride: 8, alignment: 8),
"Syntax": .init(size: 16, stride: 16, alignment: 8),
"SyntaxData": .init(size: 32, stride: 32, alignment: 8),
"AbsoluteSyntaxInfo": .init(size: 12, stride: 12, alignment: 4),
"SyntaxDataReference?": .init(size: 8, stride: 8, alignment: 8),
"AtomicPointer": .init(size: 8, stride: 8, alignment: 8),
]
let values = SyntaxMemoryLayout.values
XCTAssertEqual(values.count, expected.count)
for exp in expected {
let actualValue = try XCTUnwrap(values[exp.key], "Missing '\(exp.key)'")
XCTAssertEqual(actualValue, exp.value, "Matching '\(exp.key)' values")
}
}
func testSyntaxDataTailAllocation() throws {
#if !arch(x86_64) && !arch(arm64)
throw XCTSkip("Only runs on x86_64 and arm64")
#endif
let values = SyntaxMemoryLayout.values
// This ensures 'AtomicPointer' is safe to tail allocate right after 'SyntaxData.stride'
XCTAssertGreaterThanOrEqual(values["SyntaxData"]!.alignment, values["AtomicPointer"]!.alignment)
}
}
|
