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RichFelker's profile
Rich Felker
Rich Felker
Rich Felker
@RichFelker

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Rich Felker

@RichFelker

Yeah, I do @musllibc, FOSS & infosec stuff. But now is not the time for a mostly-/only-tech Twitter feed.

musl-libc.org
Joined March 2014

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    1. Rich Felker‏ @RichFelker 15 Dec 2016
      Replying to @whitequark

      Traditionally alloca is horrible and a source of non-reportable errors. Does the Rust one do less horribly?

      2 replies 0 retweets 2 likes
    2. Steve Canon‏ @stephentyrone 15 Dec 2016
      Replying to @RichFelker @whitequark

      alloca: for when you're in so much of a rush to shoot yourself in the foot that you can't afford allocator overhead.

      4 replies 1 retweet 4 likes
    3. Steve Canon‏ @stephentyrone 15 Dec 2016
      Replying to @stephentyrone @RichFelker @whitequark

      alloca has its uses. Several orders of magnitude fewer than the times it's actually used.

      2 replies 0 retweets 1 like
    4. whitequark‏ @whitequark 15 Dec 2016
      Replying to @stephentyrone @RichFelker

      I don't see any problem with using alloca at all as long as it's memory-safe

      2 replies 0 retweets 1 like
    5. Jordan Rose‏ @UINT_MIN 15 Dec 2016
      Replying to @whitequark @stephentyrone @RichFelker

      Right; that's how VLAs work. Yes?

      1 reply 0 retweets 0 likes
    6. whitequark‏ @whitequark 15 Dec 2016
      Replying to @UINT_MIN @stephentyrone @RichFelker

      Rust doesn't have VLAs

      1 reply 0 retweets 0 likes
    7. Jordan Rose‏ @UINT_MIN 15 Dec 2016
      Replying to @whitequark @stephentyrone @RichFelker

      Oh, yeah, not about the original post, just an equivalent feature that's not considered unsafe.

      2 replies 0 retweets 0 likes
    8. Jordan Rose‏ @UINT_MIN 15 Dec 2016
      Replying to @UINT_MIN @whitequark and

      (because you get proper scoping enforced, which Rust is already very very good at)

      1 reply 0 retweets 0 likes
    9. whitequark‏ @whitequark 15 Dec 2016
      Replying to @UINT_MIN @stephentyrone @RichFelker

      I don't really think VLAs are an improvement over raw alloca without borrow checking

      2 replies 0 retweets 0 likes
    10. Jordan Rose‏ @UINT_MIN 15 Dec 2016
      Replying to @whitequark @stephentyrone @RichFelker

      I don't get this. alloca's "until end of frame" seems objectively worse than "until end of scope".

      1 reply 0 retweets 1 like
      Rich Felker‏ @RichFelker 15 Dec 2016
      Replying to @UINT_MIN @whitequark @stephentyrone

      Until-end-of-frame is more powerful, therefore more dangerous. You can alloca per-loop-iteration.

      11:07 AM - 15 Dec 2016
      1 reply 0 retweets 0 likes
        1. New conversation
        2. Jordan Rose‏ @UINT_MIN 15 Dec 2016
          Replying to @RichFelker @whitequark @stephentyrone

          Ew, but could be useful, good point.

          1 reply 0 retweets 0 likes
        3. Steve Canon‏ @stephentyrone 15 Dec 2016
          Replying to @UINT_MIN @RichFelker @whitequark

          I have some timing code that deliberately does this to walk stack alignments.

          0 replies 0 retweets 1 like
        4. End of conversation

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