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davidtolnay's profile
David Tolnay
David Tolnay
David Tolnay
@davidtolnay

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David Tolnay

@davidtolnay

Menlo Park, CA
Joined October 2018

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    1. This Tweet is unavailable.
    2. Sean Griffin‏ @sgrif Sep 4
      • Report Tweet
      Replying to @yoshuawuyts @jntrnr @davidtolnay

      I'm extremely confused at how wasm affects proc macros

      1 reply 0 retweets 4 likes
    3. David Tolnay‏ @davidtolnay Sep 4
      • Report Tweet
      Replying to @sgrif @yoshuawuyts @jntrnr

      We'd like to have http://crates.io  distribute proc macros as precompiled wasm binaries that are executed by a wasm runtime in the compiler. Then adding a dependency on a proc macro no longer adds anything to compile time.

      4 replies 6 retweets 26 likes
    4. Sean Griffin‏ @sgrif Sep 4
      • Report Tweet
      Replying to @davidtolnay @yoshuawuyts @jntrnr

      Interesting. You still have to compile the wasm, so it's not "nothing" ;) Why wasm over MIR or a cranelift based rustc?

      1 reply 0 retweets 3 likes
    5. steveklabnik‏ @steveklabnik Sep 4
      • Report Tweet
      Replying to @sgrif @davidtolnay and

      Wild guess: wasm is stable, MIR is *very* unstable

      1 reply 0 retweets 1 like
    6. Sean Griffin‏ @sgrif Sep 4
      • Report Tweet
      Replying to @steveklabnik @davidtolnay and

      That's my guess too, but this is executed in the compiler so there's some flexibility -- and there's been talk of MIR only crates for a while now so the idea of making it forwards compatible seems like it's in the realm of possibility anyway

      1 reply 0 retweets 2 likes
    7. David Tolnay‏ @davidtolnay Sep 4
      • Report Tweet
      Replying to @sgrif @steveklabnik and

      My impression is MIR codegen to machine code takes much longer than wasm to machine code, or alternatively interpreted MIR has a 10x or worse performance overhead than wasm. Determinism and isolation are additional advantages over MIR:https://internals.rust-lang.org/t/pre-rfc-procmacros-implemented-in-wasm/10860 …

      2 replies 0 retweets 4 likes
    8. eD(opamine)D(eficient)yb (see bio)‏ @eddyb_r Sep 4
      • Report Tweet
      Replying to @davidtolnay @sgrif and

      miri is better at determinism and isolation though, its allocations are symbolic, while wasm is concrete in a sense, miri is more objcap than wasm only good reason not to use miri IMO, is interpreting cost could be alleviated by monomorphizing on the fly, but unsure

      2 replies 0 retweets 1 like
    9. David Tolnay‏ @davidtolnay Sep 4
      • Report Tweet
      Replying to @eddyb_r @sgrif and

      I meant: those are advantages over compiled MIR. We don't want to download proc macros as MIR and finish compiling them because no determinism and isolation and it's slow. We don't want to download proc macros as MIR and interpret them because it's slow too.

      1 reply 0 retweets 0 likes
    10. eD(opamine)D(eficient)yb (see bio)‏ @eddyb_r Sep 4
      • Report Tweet
      Replying to @davidtolnay @sgrif and

      aaah. there is a misunderstanding here, too you couldn't do this even if you wanted to because everything after parsing (macros, types, MIR, etc) depends on the target chosen unless you have .rmeta for a fixed target like wasm32, I guess

      2 replies 0 retweets 0 likes
      David Tolnay‏ @davidtolnay Sep 4
      • Report Tweet
      Replying to @eddyb_r @sgrif and

      We could if we wanted to, because in practice the overwhelming majority of http://crates.io  requests are probably for a pretty small set of targets. You could precompile MIR for those. Perfect shouldn't be the enemy of improving compile time for 99% of users!

      7:50 PM - 4 Sep 2019
      • 3 Likes
      • withoutboats Sean Griffin
      1 reply 0 retweets 3 likes
        1. New conversation
        1. eD(opamine)D(eficient)yb (see bio)‏ @eddyb_r Sep 4
          • Report Tweet
          Replying to @davidtolnay @sgrif and

          okay, fair, I should've phrased it better for interpretation the target doesn't matter anyway, have you considered dependency on compiler version? with some tweaks to the proc_macro<->rustc bridge you would never need to recompile a wasm blob (except for perf wins etc.)

          1 reply 0 retweets 0 likes
        2. eD(opamine)D(eficient)yb (see bio)‏ @eddyb_r Sep 4
          • Report Tweet
          Replying to @eddyb_r @davidtolnay and

          this is not true for Cranelift IR, MIR (.rmeta really, MIR isn't an IR that can live outside of rustc's def/type/trait-system) etc. also: have you considered doing the same with build scripts (that don't themselves link against native libraries)? is WASI enough?

          0 replies 0 retweets 0 likes
          3. End of conversation

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