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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 3 Sep 2019
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      Hot take: Exceptions are a fine error-handling mechanism.

      17 replies 11 retweets 141 likes
    2. whitequark‏ @whitequark 3 Sep 2019
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      Replying to @pcwalton

      I don't think an error-handling mechanism can be said to be "fine" or not without consideration of a specific implementation and domain. For example, I'm using zero-cost EH in a hard real-time system and it turns out people actually want the exceptional path to be fast and…

      1 reply 0 retweets 13 likes
    3. whitequark‏ @whitequark 3 Sep 2019
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      Replying to @whitequark @pcwalton

      not merely predictable, which throws quite a wrench in the works. (My alternatives at the time included "SjLj" and "CPS" and did not include "no EH" so I think it was the right choice at the moment, but it's still pretty painful.)

      1 reply 0 retweets 6 likes
    4. Patrick Walton‏ @pcwalton 3 Sep 2019
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      Replying to @whitequark

      Oh, I’m not really considering implementation details right now, just abstractly in terms of PL design.

      2 replies 0 retweets 2 likes
    5. Patrick Walton‏ @pcwalton 3 Sep 2019
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      Replying to @pcwalton @whitequark

      BTW, the “zero-cost exceptions” model is not universally loved among PL implementers. In fact, it’s pretty much a C++ism. JVMs in particular have traditionally never had zero-cost exceptions.

      2 replies 0 retweets 7 likes
    6. Patrick Walton‏ @pcwalton 3 Sep 2019
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      Replying to @pcwalton @whitequark

      This famously got GCJ into trouble, because Eclipse would take something like a minute to start up, as its startup path threw thousands of exceptions during normal execution. GCJ had to switch to some other method.

      1 reply 0 retweets 26 likes
    7. gankra's gay‏ @Gankra_ 3 Sep 2019
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      Replying to @pcwalton @whitequark

      this is one of my fav folklore facts, would love to know if you have a good reference for it that i can use

      1 reply 0 retweets 3 likes
      Patrick Walton‏ @pcwalton 3 Sep 2019
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      Replying to @Gankra_ @whitequark

      You know what, I actually can’t remember where I heard it. It must have been something I remember @graydon_pub saying, or perhaps @littlecalculist or @nikomatsakis…

      3:02 PM - 3 Sep 2019
      • 3 Likes
      • David Bonet Yaah 🍑🦀☕ eddyb, thriving in isolation,
      3 replies 0 retweets 3 likes
        1. New conversation
        2. Graydon Hoare‏ @graydon_pub 4 Sep 2019
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          Replying to @pcwalton @Gankra_ and

          Ok I'll come off twitter-break for _one_ tweet to clarify this as it's turning into folklore. Just a small bug, a failure to find (or emit) the binary-search table in .eh_frame, causing big linear search per throw. Patch seems lost in mists of time: libunwind, libffi, bfd or gcj.

          1 reply 0 retweets 13 likes
        3. Graydon Hoare‏ @graydon_pub 4 Sep 2019
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          Replying to @graydon_pub @pcwalton and

          I probably mentioned it before as a funny story about a tiny impl. fix with a major perf impact (in context of perception of "slow java" etc); not anti-exceptions on cost basis alone, though costs are worse if you need many landing pads doing eager cleanups everywhere (not GC).

          2 replies 0 retweets 2 likes
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        1. Andy Gocke‏ @andygocke 3 Sep 2019
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          Replying to @pcwalton @Gankra_ and

          We've hit a few problems because exceptions are not cheap in the CLR like they are in Java, but people have ported Java to C# and we get reports that everything is super slow because they're using exceptions for standard control flow

          0 replies 0 retweets 5 likes
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        1. Latest Tweets‏ @__vlqc 3 Sep 2019
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          Replying to @pcwalton @Gankra_ and

          I'm fairly sure I read that story like a decade ago when I was idly browsing the gcj docs, maybe it's just on their website

          0 replies 0 retweets 2 likes
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