Contributing to Swift

Before Swift was open sourced, our only way to communicate with Apple was through Radar. Filing Radars is an arcane, opaque, and frequently frustrating process. But now we have a whole host of ways to chat directly to Apple engineers, all the way from mailing lists to Twitter messages. Even better than that we can actually dig through large bits of the code we use every day, and see how it works. And then when we find something we think could be better we can fix it! Thats exactly what I did, and last summer a small piece of my code shipped with Xcode 8, and most of you have probably used it. In this talk I’ll tell the story of exactly how that came to be, and explore ways that you can get involved too.

Transcript

1. Contributing to Swift by @neilkimmett
2. Contributing to Swift - a little revision - story of my contribution - ways you can contribute - gnarly details
3. struct CGPoint { var x: CGFloat var y: CGFloat } struct CGSize { var width: CGFloat var height: CGFloat } struct CGRect { var origin: CGPoint var size: CGSize }
4. struct CGPoint { static var zero: CGPoint } struct CGSize { static var zero: CGSize } struct CGRect { static var zero: CGRect } x: 0 y: 0 width: 0 height: 0 origin: {0, 0} size: {0, 0}
5. view.frame.origin = let view = UIView() … .zero
6. struct UIEdgeInsets { var top: CGFloat var left: CGFloat var bottom: CGFloat var right: CGFloat }
7. view.layoutMargins = let view = UIView() … UIEdgeInsetsZero .zero
15. http://bugreport.apple.com/
19. http://bugreport.apple.com/
21. https://swift.org
22. https://github.com/apple/swift
33. ‼
36. https://github.com/apple/swift/pull/1323
41. What can I do?
42. “To be a truly great community, Swift.org needs to welcome developers from all walks of life, with different backgrounds, and with a wide range of experience. A diverse and friendly community will have more great ideas, more unique perspectives, and produce more great code. We will work diligently to make the Swift community welcoming to everyone.”
43. https://lists.swift.org
44. https://stylemac.com/hirundo/
45. https://apple.github.io/swift-evolution/
46. https://swiftweekly.github.io
47. https://spec.fm/podcasts/swift-unwrapped
48. @jckarter Joe Groff @UINT_MIN Jordan Rose @dgregor79 Doug Gregor @tkremenek Ted Kremenek @ericasadun Erica Sadun @modocache Brian Gesiak
50. https://bugs.swift.org
51. https://github.com/apple/swift
52. Ninja
53. brew install cmake ninja
54. git clone https://github.com/apple/swift.git mkdir swift-source cd swift-source ./swift/utils/update-checkout --clone
56. ./swift/utils/build-script -h ./swift/utils/build-script -R -t
57. LLVM
58. LLVM IR x86 executable clang swift Haskell ARM PowerPC frontend backend
59. .swift AST SIL LLVM IR assembly executable parse SILGen IRGen LLVM
60. swiftc -dump-ast -emit-silgen -emit-sil -emit-ir -emit-assembly add.swift
61. let x = 1 + 1 print(x) add.swift
62. swiftc -dump-ast add.swift
63. swiftc -dump-ast add.swift
64. swiftc -emit-silgen add.swift | xcrun swift-demangle
65. swiftc -emit-silgen add.swift | xcrun swift-demangle
66. swiftc -emit-silgen add.swift | xcrun swift-demangle
67. swiftc -emit-silgen add.swift | xcrun swift-demangle
68. swiftc -emit-silgen add.swift | xcrun swift-demangle
69. swiftc -emit-sil add.swift | xcrun swift-demangle
70. swiftc -emit-ir add.swift | xcrun swift-demangle
71. swiftc -emit-assembly add.swift | xcrun swift-demangle
72. https://nicoleorchard.com/blog/compilers
73. https://github.com/apple/swift-evolution Swift 5
74. - ABI stability required - Generics and String features for stdlib - Memory ownership model - Source breaking changes have even higher bar than Swift 4 - Every evolution proposal requires working implementation with test cases Swift 5
75. No-one has any idea what they’re doing
76. https://www.youtube.com/watch?v=GnT2ZeHVJe4
77. https://news.realm.io/news/tryswift-jesse-squires-contributing-open- source-swift/ Jesse Squires - Contributing to Open Source Swift
78. https://news.realm.io/news/slug-russ-bishop-contributing-open- source-swift-proposal/ Russ Bishop - Contributing to Swift: From Proposal to Shipped
81. Thanks! from @neilkimmett