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pcwalton's profile
Patrick Walton
Patrick Walton
Patrick Walton
@pcwalton

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Patrick Walton

@pcwalton

Research engineer at Mozilla

San Francisco, CA
pcwalton.github.io
Joined November 2009

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    1. Patrick Walton‏ @pcwalton Jan 30
      • Report Tweet
      • Report NetzDG Violation

      Easy to say "monomorphization is awful and Rust should never have done it", harder to say "I want all generic functions to be compiled to bytecode and to embed a Rust interpreter in every binary".

      22 replies 15 retweets 188 likes
      Show this thread
    2. Tony “Abolish ICE” Arcieri  🦀‏ @bascule Jan 30
      • Report Tweet
      • Report NetzDG Violation
      Replying to @pcwalton

      I just want the flag to say "I'll write all my code the monomorphizable way but I'll take smaller code at the cost of worse performance so please treat all my generics and impl Traits like they're dyn". ...because @rustembedded

      3 replies 2 retweets 19 likes
    3. Patrick Walton‏ @pcwalton Jan 30
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      • Report NetzDG Violation
      Replying to @bascule @rustembedded

      You can’t just treat generics and impl Traits as dyn. That leads to intensional type analysis which is just not worth it.

      2 replies 0 retweets 4 likes
    4. Sam Tobin-Hochstadt‏ @samth Jan 30
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      Replying to @pcwalton @bascule @rustembedded

      Why can't you do dictionary passing?

      1 reply 0 retweets 1 like
    5. Patrick Walton‏ @pcwalton Jan 30
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      • Report NetzDG Violation
      Replying to @samth @bascule @rustembedded

      Because we don't have a uniform value representation, so dictionary passing turns into intensional type analysis and it becomes a huge mess (trust me, I wrote a ton of that code back in the day).

      1 reply 0 retweets 4 likes
    6. Sam Tobin-Hochstadt‏ @samth Jan 30
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      Replying to @pcwalton @bascule @rustembedded

      I guess I'm confused about why the dictionary wouldn't just be able to handle the difference.

      1 reply 0 retweets 0 likes
      Patrick Walton‏ @pcwalton Jan 30
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      Replying to @samth @bascule @rustembedded

      It can, but it turns into a huge mess because there are all sorts of problems. e.g. you have to be able to create dictionaries at runtime because of types like tuple types like (T,T) and you have to make functions like “copy these bits”, “get the alignment of this type”, virtual.

      6:22 PM - 30 Jan 2020
      • 2 Likes
      • Varun Ramesh Bengt Ericsson
      1 reply 0 retweets 2 likes
        1. Patrick Walton‏ @pcwalton Jan 30
          • Report Tweet
          • Report NetzDG Violation
          Replying to @pcwalton @samth and

          https://gankra.github.io/blah/swift-abi/  has some more info

          0 replies 0 retweets 1 like
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