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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

      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".

      23 replies 14 retweets 186 likes
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    2. Patrick Walton‏ @pcwalton Jan 30
      • Report Tweet

      I'm increasingly convinced that the interpreter solution is the only reasonable alternative for Rust.

      6 replies 1 retweet 15 likes
      Show this thread
      Patrick Walton‏ @pcwalton Jan 30
      • Report Tweet

      *I'm* actually OK with this as an opt-in compilation mode, at least for cold functions. But are the people complaining about compilation time OK with it?

      2:38 PM - 30 Jan 2020
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      7 replies 0 retweets 22 likes
        1. New conversation
        2. Rik Arends‏ @rikarends Jan 30
          • Report Tweet
          Replying to @pcwalton

          I'm sure i't find use for very rapidly compiled Rust 'things' beit modules or things i can update live.

          1 reply 0 retweets 1 like
        3. Patrick Walton‏ @pcwalton Jan 30
          • Report Tweet
          Replying to @rikarends

          I agree! I’m actually bullish on an interpreter as an opt-in compilation mode.

          0 replies 0 retweets 5 likes
        4. End of conversation
        1. New conversation
        2. Tristan Hume‏ @trishume Jan 30
          • Report Tweet
          Replying to @pcwalton

          What about Swift witness tables as a kind of half-way? Also I would want interpreted only for newly-needed generic functions in an incremental compile and then my long-running compile process hot-swaps in monomorphized versions when they’re ready.

          1 reply 0 retweets 2 likes
        3. Patrick Walton‏ @pcwalton Jan 30
          • Report Tweet
          Replying to @trishume

          We tried witness tables (intensional type analysis). It was a giant mess (I wrote a lot of that code). I suspect it wouldn’t be much faster at runtime than just having an interpreter, and an interpreter would be faster to compile.

          0 replies 0 retweets 2 likes
        4. End of conversation
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        2. Felipe O. Carvalho‏ @_Felipe Jan 30
          • Report Tweet
          Replying to @pcwalton

          In C++ I can do forward declarations and add virtual interfaces between module boundaries to improve compilation speed (i.e. allow separate compilation). Is that kind of tuning possible with Rust?

          1 reply 0 retweets 0 likes
        3. Patrick Walton‏ @pcwalton Jan 30
          • Report Tweet
          Replying to @_Felipe

          Yes, you can factor into separate crates.

          0 replies 0 retweets 2 likes
        4. End of conversation
        1. New conversation
        2. Sebastian Sylvan‏ @ssylvan Jan 30
          • Report Tweet
          Replying to @pcwalton

          Could you explain more why it needs an interpreter and not "just" abstract (via vtable) over all the type things the code depends on (assuming data layout was still monomorphized)? E.g. ask vtable for size, copy function etc. What am I missing?

          1 reply 0 retweets 0 likes
        3. Patrick Walton‏ @pcwalton Jan 30
          • Report Tweet
          Replying to @ssylvan

          Because doing so is a giant mess. I wrote a lot of that code early on. I highly suspect that if we did it again it would be just as slow as interpreting the whole function.

          1 reply 0 retweets 0 likes
        4. 7 more replies
        1. Indy Ray‏ @ScatteredRay Jan 30
          • Report Tweet
          Replying to @pcwalton

          As a development mode to improve iteration that can be turned off for release? Yes please!

          0 replies 0 retweets 1 like
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        1. Louis Dureuil‏ @lodurel Jan 30
          • Report Tweet
          Replying to @pcwalton

          By interpreter, do you also mean a JIT? I suspect such a thing could also do good with regards to ABI: eg we could instantiate generics at runtime, when they're needed, even when dynamically linking.

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