Contributing to Swift Compiler

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Yusuke Kita presented on his experience contributing to the Swift compiler. He contributed improvements and fixes to the compiler's libSyntax, AST, and SIL components. He encourages others to get involved by taking ideas from and giving ideas to the open source Swift community. Contributions can start small and it's never too late to start. The try! Swift events provide workshops for contributing to Open Source Swift.

Technology

Contributing to
Swift Compiler
Contributing to Swift Compiler, Yusuke Kita (@kitasuke), try! Swift Tokyo 2019

Hi, I'm Yusuke
@kitasuke
Contributing to Swift Compiler, Yusuke Kita (@kitasuke), try! Swift Tokyo 2019

How did I contribute?
Contributing to Swift Compiler, Yusuke Kita (@kitasuke), try! Swift Tokyo 2019

Community-Driven
Contribution
Contributing to Swift Compiler, Yusuke Kita (@kitasuke), try! Swift Tokyo 2019

Swift Community
Contributing to Swift Compiler, Yusuke Kita (@kitasuke), try! Swift Tokyo 2019

try! Swift
Contributing to Swift Compiler, Yusuke Kita (@kitasuke), try! Swift Tokyo 2019

try! Swift-Driven
Contribution
Contributing to Swift Compiler, Yusuke Kita (@kitasuke), try! Swift Tokyo 2019

!
Contributing to Swift Compiler, Yusuke Kita (@kitasuke), try! Swift Tokyo 2019

Open Source Swift
Contributing to Swift Compiler, Yusuke Kita (@kitasuke), try! Swift Tokyo 2019

Contributing to Open Source Swift
→ try! Swift Tokyo 2016
Contributing to Swift Compiler, Yusuke Kita (@kitasuke), try! Swift Tokyo 2019

Swift Compiler
Contributing to Swift Compiler, Yusuke Kita (@kitasuke), try! Swift Tokyo 2019

libSyntax
SwiftSyntax
Contributing to Swift Compiler, Yusuke Kita (@kitasuke), try! Swift Tokyo 2019

Improving Swift Tools with libSyntax
→ try! Swift NYC 2017
Contributing to Swift Compiler, Yusuke Kita (@kitasuke), try! Swift Tokyo 2019

AST
Contributing to Swift Compiler, Yusuke Kita (@kitasuke), try! Swift Tokyo 2019

AST Meta-Programming in Swift
→ try! Swift Tokyo 2018
Contributing to Swift Compiler, Yusuke Kita (@kitasuke), try! Swift Tokyo 2019

SIL
Contributing to Swift Compiler, Yusuke Kita (@kitasuke), try! Swift Tokyo 2019

SIL for First Time Learners
→ try! Swift Tokyo 2018
Contributing to Swift Compiler, Yusuke Kita (@kitasuke), try! Swift Tokyo 2019

Open Source Swift
Workshop
Contributing to Swift Compiler, Yusuke Kita (@kitasuke), try! Swift Tokyo 2019

Open Source Swift
Workshop
→ try! Swift Tokyo 2018
[SILGen] Use shared string
constant for swift shims name in
SILPrint
!
Contributing to Swift Compiler, Yusuke Kita (@kitasuke), try!
Swift Tokyo 2019

Open Source Swift
Workshop
→ try! Swift San Jose 2018
[SIL] Don't print duplicated import
decls
!
Contributing to Swift Compiler, Yusuke Kita (@kitasuke), try!
Swift Tokyo 2019

Open Source Swift
Workshop
→ try! Swift Tokyo 2019
Submit your PR tomorrow!
Contributing to Swift Compiler, Yusuke Kita (@kitasuke), try!
Swift Tokyo 2019

Recap
Contributing to Swift Compiler, Yusuke Kita (@kitasuke), try! Swift Tokyo 2019

Recap
→ Take ideas from community
Contributing to Swift Compiler, Yusuke Kita (@kitasuke), try! Swift Tokyo 2019

Recap
→ Take ideas from community
→ Give ideas to community
Contributing to Swift Compiler, Yusuke Kita (@kitasuke), try! Swift Tokyo 2019

Recap
→ Take ideas from community
→ Give ideas to community
→ Never too late to start
Contributing to Swift Compiler, Yusuke Kita (@kitasuke), try! Swift Tokyo 2019

References
→ Getting Started with Swift Compiler Development
→ Building a Compiler in Swift with LLVM, Part 1:
Introduction and the Lexer
→ How to talk to your kids about SIL type use
→ Swift コンパイラのアーキテクチャ(JP)
→ Swiftコンパイラ開発用の環境構築(JP)
Contributing to Swift Compiler, Yusuke Kita (@kitasuke), try! Swift Tokyo 2019

Thank you!
Contributing to Swift Compiler, Yusuke Kita (@kitasuke), try! Swift Tokyo 2019

The document discusses integrating the libSyntax library into the Swift compiler pipeline. Currently, the Swift parser emits both a libSyntax syntax tree and a semantic AST, but libSyntax ignores the AST. The goal is for the parser to fully embrace libSyntax and stop emitting the AST. It describes the existing parsing process, which builds the AST at each step, and explores options for modifying it to also build the libSyntax tree at each step instead of just the AST.

Making your own tool using SwiftSyntax

Yusuke Kita

[Deprecated] Integrating libSyntax into the compiler pipeline

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Creating your own Bitrise step

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Introducing swift-format

Yusuke Kita

Unidirectional Data Flow Through SwiftUI

Yusuke Kita

Open Source Swift Workshop

Yusuke Kita

This document summarizes Yusuke Kita's open source Swift workshop presented at try! Swift Tokyo 2019. The workshop covered getting started with contributing to the Swift compiler, building Swift and SwiftSyntax from source, debugging and testing Swift, building your own tools with SwiftSyntax, writing your own compilers, and tips for working with the open source Swift project. Attendees were encouraged to ask questions during the workshop presentation.

Writing a compiler in go

Yusuke Kita

This document discusses writing a compiler in Go. It provides an overview of the different modules needed for a compiler, including tokenization, lexing, parsing, AST generation, code generation, and a virtual machine. It also demonstrates these concepts by summarizing the development of a Monkey compiler, with modules for tokens, lexer, parser, AST, objects, evaluation, and code generation. Key takeaways are gaining an understanding of how compilers work, learning more about Go, and laying foundations for static analysis tools.

The document discusses writing an interpreter for a programming language in Swift. It summarizes the key modules of the interpreter including the syntax, lexer, semantic analyzer (Sema), abstract syntax tree (AST), and read-evaluate-print loop (REPL). Code examples are provided for defining token types in the syntax, lexing source code into tokens, parsing tokens into an AST using the semantic analyzer, and evaluating nodes in the AST.

SIL Optimizations - AllocBoxToStack

Yusuke Kita

The document discusses the SIL optimization pass called AllocBoxToStack. It begins by providing context on SIL and why it is used. It then explains the difference between allocating values on the stack vs the heap. The main part of the document describes how the AllocBoxToStack pass works to promote alloc_box instructions to alloc_stack by analyzing variable lifetimes and use patterns. Code examples are provided to demonstrate the optimization.

SIL for First Time Learners

Yusuke Kita

The document discusses SIL (Swift Intermediate Language), which is the intermediate representation used by the Swift compiler. It provides an overview of SIL and how the Swift compiler uses it, demonstrates converting Swift code to SIL, and shows how optimizations are performed from raw SIL to canonical SIL. Examples are given of memory optimizations and how flag settings can control optimizations. In summary, learning SIL provides insights into how the Swift compiler works and is worthwhile for optimization.

var, let in SIL

Yusuke Kita

The document compares the differences between var and let in Swift's SIL (Swift Intermediate Language). Var uses alloc_box to allocate memory on the heap while let uses alloc_stack to allocate on the stack. Var requires begin_access/end_access instructions to access memory, while let uses direct load/store. Var needs destroy_value to release memory, while let uses dealloc_stack. The key difference is that var uses reference counting for a box on the heap, while let uses stack allocation with direct lifetime management.

SIL for First Time Leaners LT

Yusuke Kita

The document discusses Swift Intermediate Language (SIL), which is an intermediate representation used by the Swift compiler. SIL allows understanding how the Swift compiler works and enables optimizations. Examples show how a simple Swift function is represented in SIL and how optimizations remove unnecessary intermediate variables. Learning SIL provides insights into the Swift type system and compiler optimizations.

How to try! Swift

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SIL for the first time

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Introducing protobuf in Swift

Yusuke Kita

The document discusses introducing Protocol Buffers (protobuf) in Swift. It begins with an overview of protobuf and how it provides a compact and efficient way of serializing structured data. It then covers how to use protobuf in Swift projects - defining message types in .proto files, generating Swift code from the .proto files, and serializing/deserializing data to and from the defined message types. Key advantages of using protobuf like type safety, shared data models across platforms, and high performance are also highlighted.

Type-safe Web APIs with Protocol Buffers in Swift at AltConf

Yusuke Kita

The document discusses using Protocol Buffers for building type-safe web APIs in Swift. It describes Protocol Buffers as a serialization format that is smaller, faster and safer than JSON. It explains that Protocol Buffers involve defining message types in .proto files, generating code from those files, and then serializing and deserializing data to and from the defined types. The speaker will cover what Protocol Buffers are, their pros and cons, and how to get started with them.

Type-safe Web APIs with Protocol Buffers in Swift at iOSCon

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Swift core

Yusuke Kita

The document provides information about Swift Core, which includes the core libraries and functionality of the Swift programming language. It lists some of the key Swift libraries like swiftAST and swiftLLVMParses. It also describes the documentation build process and lists important files that define the language like Attr.def, Builtin.def, and MappedTypes.def. The document outlines how to install and develop Swift in Xcode and highlights some core language functions.

SwiftCoreとFoundationを読んでみた

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Search APIs & Universal Links

Yusuke Kita

The document discusses Apple's search APIs and how they enable apps to provide rich content to Spotlight, Siri and Safari search results. It covers three APIs - NSUserActivity, App Search and CoreSpotlight - that allow indexing app content and activities to make them discoverable in searches. The document also discusses how to index web content to drive traffic to mobile apps and optimize search results through techniques like keywords, structured data and fast deep linking to improve an app's relevance ranking.

Introducing Cardio

Yusuke Kita

This document introduces CardioMerkari Inc. and their Cardio health kit wrapper library. Cardio is an open source Swift library that provides a simple interface for accessing HealthKit functionality related to workouts. It handles authorization, reading workout data from sensors, and saving workout data to HealthKit. The document provides information on using Cardio such as initializing it with a context, setting up authorization, starting and ending workout sessions, handling sensor updates, and saving workout data.

Command Line Tool in swift

Yusuke Kita

This document discusses developing a command line tool in Swift. It covers using the Commandant framework to parse command line arguments, setting up the project structure with Xcode workspaces, adding dependencies with Carthage, configuring build settings, and implementing commands using the Commandant protocol. The goal is to provide a guide for creating a CLI tool in Swift, from setting up the initial project to deploying and debugging the finished application.

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Search APIs in Spotlight and Safari

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The document discusses three APIs - NSUserActivity, CoreSpotlight, and web markup - that app developers can use to make their app content searchable on iOS devices. It provides details on how to index app data, activities, and web content to improve discovery and bring users into the app via search and Siri suggestions. Best practices are covered such as supporting deep links, using descriptive attributes, and optimizing the app launch experience from search results. Known issues with some search integration features are also mentioned.

Protocol in Swift

Yusuke Kita

This document discusses protocols in Swift. It defines a protocol as a blueprint of methods, properties, and requirements that can be adopted by classes, structures, and enumerations. Protocols like Equatable, Comparable, and CollectionType are built-in to Swift and provide common functionality. The document provides examples of built-in protocols and how protocol extensions allow adding functionality to existing protocols.

How to make workout app for watch os 2

Yusuke Kita

This document provides guidance on creating a workout tracking app for the Apple Watch using HealthKit. It outlines how to use the HealthKit framework to access fitness data, start and stop workout sessions, save workout data, and handle common issues like debugging on device and infrequent data updates. The main steps are initializing HealthKit, requesting authorization, querying for data during workout sessions, and saving workout objects on completion. Challenges discussed include debugging directly on the Apple Watch, keeping the app in the foreground during workouts, and managing battery usage.

WKInterfaceMap on Apple Watch

Yusuke Kita

The document discusses limitations and features of using maps on Apple Watch, including: - Current limitations of WKInterfaceMap include it not being scrollable, zoomable, or able to open Apple's map app. Only 5 annotations are allowed. - Location services can be accessed by requesting authorization from the iPhone, not the Watch. Handoff can be used if authorization is not granted. -Annotations use custom images cached from the device rather than the current location. Realm can be used instead of CoreData to share data between watch and iPhone apps. - A restaurant browsing app was rejected for having limited features, only launching maps. More robust features are needed. - PagingMenuController and

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Contributing to Swift Compiler

1. Contributing to Swift Compiler Contributing to Swift Compiler, Yusuke Kita (@kitasuke), try! Swift Tokyo 2019

2. Hi, I'm Yusuke @kitasuke Contributing to Swift Compiler, Yusuke Kita (@kitasuke), try! Swift Tokyo 2019

3. How did I contribute? Contributing to Swift Compiler, Yusuke Kita (@kitasuke), try! Swift Tokyo 2019

4. Community-Driven Contribution Contributing to Swift Compiler, Yusuke Kita (@kitasuke), try! Swift Tokyo 2019

5. Swift Community Contributing to Swift Compiler, Yusuke Kita (@kitasuke), try! Swift Tokyo 2019

6. try! Swift Contributing to Swift Compiler, Yusuke Kita (@kitasuke), try! Swift Tokyo 2019

7. try! Swift-Driven Contribution Contributing to Swift Compiler, Yusuke Kita (@kitasuke), try! Swift Tokyo 2019

8. ! Contributing to Swift Compiler, Yusuke Kita (@kitasuke), try! Swift Tokyo 2019

9. Open Source Swift Contributing to Swift Compiler, Yusuke Kita (@kitasuke), try! Swift Tokyo 2019

10. Contributing to Open Source Swift → try! Swift Tokyo 2016 Contributing to Swift Compiler, Yusuke Kita (@kitasuke), try! Swift Tokyo 2019

11. Swift Compiler Contributing to Swift Compiler, Yusuke Kita (@kitasuke), try! Swift Tokyo 2019

12. libSyntax SwiftSyntax Contributing to Swift Compiler, Yusuke Kita (@kitasuke), try! Swift Tokyo 2019

13. Improving Swift Tools with libSyntax → try! Swift NYC 2017 Contributing to Swift Compiler, Yusuke Kita (@kitasuke), try! Swift Tokyo 2019

14. AST Contributing to Swift Compiler, Yusuke Kita (@kitasuke), try! Swift Tokyo 2019

15. AST Meta-Programming in Swift → try! Swift Tokyo 2018 Contributing to Swift Compiler, Yusuke Kita (@kitasuke), try! Swift Tokyo 2019

16. SIL Contributing to Swift Compiler, Yusuke Kita (@kitasuke), try! Swift Tokyo 2019

17. SIL for First Time Learners → try! Swift Tokyo 2018 Contributing to Swift Compiler, Yusuke Kita (@kitasuke), try! Swift Tokyo 2019

18. Swift Compiler Contributing to Swift Compiler, Yusuke Kita (@kitasuke), try! Swift Tokyo 2019

19. ! Contributing to Swift Compiler, Yusuke Kita (@kitasuke), try! Swift Tokyo 2019

20. Open Source Swift Workshop Contributing to Swift Compiler, Yusuke Kita (@kitasuke), try! Swift Tokyo 2019

21. Open Source Swift Workshop → try! Swift Tokyo 2018 [SILGen] Use shared string constant for swift shims name in SILPrint ! Contributing to Swift Compiler, Yusuke Kita (@kitasuke), try! Swift Tokyo 2019

22. Open Source Swift Workshop → try! Swift San Jose 2018 [SIL] Don't print duplicated import decls ! Contributing to Swift Compiler, Yusuke Kita (@kitasuke), try! Swift Tokyo 2019

23. Open Source Swift Workshop → try! Swift Tokyo 2019 Submit your PR tomorrow! Contributing to Swift Compiler, Yusuke Kita (@kitasuke), try! Swift Tokyo 2019

24. ! Contributing to Swift Compiler, Yusuke Kita (@kitasuke), try! Swift Tokyo 2019

25. Recap Contributing to Swift Compiler, Yusuke Kita (@kitasuke), try! Swift Tokyo 2019

26. Recap → Take ideas from community Contributing to Swift Compiler, Yusuke Kita (@kitasuke), try! Swift Tokyo 2019

27. Recap → Take ideas from community → Give ideas to community Contributing to Swift Compiler, Yusuke Kita (@kitasuke), try! Swift Tokyo 2019

28. Recap → Take ideas from community → Give ideas to community → Never too late to start Contributing to Swift Compiler, Yusuke Kita (@kitasuke), try! Swift Tokyo 2019

29. ! Contributing to Swift Compiler, Yusuke Kita (@kitasuke), try! Swift Tokyo 2019

30. References → Getting Started with Swift Compiler Development → Building a Compiler in Swift with LLVM, Part 1: Introduction and the Lexer → How to talk to your kids about SIL type use → Swift コンパイラのアーキテクチャ(JP) → Swiftコンパイラ開発用の環境構築(JP) Contributing to Swift Compiler, Yusuke Kita (@kitasuke), try! Swift Tokyo 2019

31. Thank you! Contributing to Swift Compiler, Yusuke Kita (@kitasuke), try! Swift Tokyo 2019

Contributing to Swift Compiler

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