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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. Graydon Hoare‏ @graydon_pub 9 Apr 2018
      • Report Tweet
      • Report NetzDG Violation
      Replying to @stephentyrone @UINT_MIN

      I think adding a conservative, sensible compilation model (flat modules, acyclic deps, visibility control), a typesafe fat void* you can punch in and out of, fat bounded pointers / arrays, and ARC (with weak pointers) would be a good stopping point too.

      3 replies 0 retweets 8 likes
    2. Graydon Hoare‏ @graydon_pub 9 Apr 2018
      • Report Tweet
      • Report NetzDG Violation
      Replying to @graydon_pub @stephentyrone @UINT_MIN

      (But again, I think it's worth noting that a lot of the nice things one might want from such a Demi-Go is actually just ObjC. It reads funny, but it's not a bad language!)

      2 replies 2 retweets 6 likes
    3. Patrick Walton‏ @pcwalton 9 Apr 2018
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      Replying to @graydon_pub @stephentyrone @UINT_MIN

      Pervasive atomic reference counting and hash table based method dispatch is such a bummer though.

      4 replies 0 retweets 0 likes
    4. Erin  ✨ 💽‏ @erincandescent 9 Apr 2018
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      Replying to @pcwalton @graydon_pub and

      You rarely hit the hashtable in practice though

      1 reply 0 retweets 0 likes
    5. Patrick Walton‏ @pcwalton 9 Apr 2018
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      Replying to @erincandescent @graydon_pub and

      You usually don’t have to hash the string, but that’s not the overhead I’m talking about.

      1 reply 0 retweets 0 likes
    6. Erin  ✨ 💽‏ @erincandescent 9 Apr 2018
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      Replying to @pcwalton @graydon_pub and

      No, objc_msgSend only rarely actually looks into the hash table. Lots of caching

      1 reply 0 retweets 0 likes
    7. Patrick Walton‏ @pcwalton 9 Apr 2018
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      Replying to @erincandescent @graydon_pub and

      The IMP cache is also a hash table. :)

      1 reply 0 retweets 0 likes
    8. Erin  ✨ 💽‏ @erincandescent 9 Apr 2018
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      Replying to @pcwalton @graydon_pub and

      OK but its a very fast one :) (I remember in many benchmarks hitting the IMP cache is faster than a vtable call)

      1 reply 0 retweets 0 likes
    9. Jordan Rose‏ @UINT_MIN 9 Apr 2018
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      Replying to @erincandescent @pcwalton and

      Me: *sobbing* You can't just make every part of objc_msgSend be a hash table! @gparker: *implements tagged pointer lookup* Hash table.

      1 reply 1 retweet 11 likes
    10. Jordan Rose‏ @UINT_MIN 9 Apr 2018
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      Replying to @UINT_MIN @erincandescent and

      Jordan Rose Retweeted Jordan Rose

      (tagged pointer lookup is an array lookup, but arrays are just very simple hash tables)https://twitter.com/UINT_MIN/status/671447846546186240 …

      Jordan Rose added,

      Jordan Rose @UINT_MIN
      Replying to @numist
      @numist I think that follows from "you can put things here, or you can put them somewhere else".
      2 replies 0 retweets 1 like
      Patrick Walton‏ @pcwalton 9 Apr 2018
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      Replying to @UINT_MIN @erincandescent and

      Well, I was considering it a hash table since you have to produce a bucket index (via bitwise and) and then check the bucket, which can have collisions (but probably won’t). But yeah, if you squint hard enough everything is a hash table :)

      3:24 PM - 9 Apr 2018 from South Beach, San Francisco
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      • Jordan Rose
      0 replies 0 retweets 1 like

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