Swiftweekly.github.io: [51] Issue #51 - January 5, 2017

[jessesquires]

[jpsim]

Bug Reducer! https://lists.swift.org/pipermail/swift-dev/Week-of-Mon-20161212/003712.html

1. Given a crashing sil-opt invocation, reduce the number of functions in the input file to a minimal set causing a crash.
2. Given a crashing sil-opt invocation, reduce the number of optimization passes run on the input file to a minimal set and then try to reduce functions.
3. A random pass pipeline generator that runs N rounds of a permuted performance optimization pipeline and tries to reduce the test cases using the above tools if a crash is found.

[jessesquires]

ANTLR support:

https://github.com/antlr/antlr4
https://twitter.com/clattner_llvm/status/809640290378137600
https://twitter.com/the_antlr_guy/status/809626636115132416
http://www.antlr.org/download.html

[modocache]

Slides from an IBM conference: https://twitter.com/clattner_llvm/status/810175976583950336

• Discusses potential improvements for Swift compiler, such as parallel WMO based on LLVM's ThinLTO approach
• Swift 5 planned for release in 2018, will include concurrency model
• Discussions on concurrency model to begin in Spring/Summer 2017

[jessesquires]

@modocache - Ha! I just came here to post that link 😄

[jessesquires]

Implement main/isMainThread:
https://github.com/apple/swift-corelibs-foundation/pull/748

[modocache]

A truly shameless plug for the "commits and pull requests" section: https://github.com/apple/swift/pull/6298

[jpsim]

This one fixes quite a few issues, while simplifying the implementation: https://github.com/apple/swift/pull/6309

This PR cleans up a number of issues related to the various casting operations, spelled as, as?, as!, and is...

[jpsim]

Looking back on Swift 3 and ahead to Swift 4

Lots of good stuff to unwrap in there. Especially interesting are the "Possible Swift 4 Stage 2 Efforts". Here's a small sample, summarized:

• Reflection: The core team is committed to adding powerful dynamic features to Swift.
• First class concurrency: Actors, async/await, atomicity, memory model, and related topics.
• Generics improvements
• .swiftmodule stability
• New scripting features: Regular expressions, multi-line string literals, etc.
• Property behaviors
• Syntactic sugar
• So many others...

[modocache]

That email appears to be from July...? Or am I missing something?

[jpsim]

Oops, my mistake. It was re-shared today and seemed very much applicable and I didn't check the date! Though the reference to Swift 3.0.1 seemed odd...

[jessesquires]

"Real compilers never crash" 😆
https://github.com/apple/swift/pull/6484

[jessesquires]

partial + layout specialization:
https://twitter.com/slava_pestov/status/812700538584387584

[jessesquires]

lattner on result types:
https://lists.swift.org/pipermail/swift-evolution/Week-of-Mon-20161226/029854.html

[modocache]

Another truly shameless plug: https://github.com/apple/swift/pull/6495 -- better colorization of AST and parse tree dumps.

[jessesquires]

@modocache - I saw that! Pretty rad 😎

[BasThomas]

SE-0110 implemented: https://github.com/apple/swift-evolution/commit/9e95709468756605aabcde500d7c920891a665fe

[BasThomas]

https://oleb.net/blog/2016/12/protocols-have-semantics/

[jpsim]

Kevin Ballard's PR to include unavailable/deprecated/availability attributes when printing Obj-C declarations for Swift functions has been merged: https://github.com/apple/swift/pull/6480