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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. whitequark‏ @whitequark 14 Dec 2016

      really excited about the Rust alloca! RFC (https://github.com/rust-lang/rfcs/pull/1808 …); it'll make it possible to allocate a linked list or a tree w/o heap...

      2 replies 2 retweets 19 likes
    2. 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
    3. 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
    4. 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
    5. 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
    6. Rich Felker‏ @RichFelker 15 Dec 2016
      Replying to @whitequark @stephentyrone

      The big problem is lack of any way to report or handle failure, combined with runaway mem unsafety on failure.

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

      The latter can be fixed with -fstack-check type solution, but the former requires knowledge of stack limits.

      1 reply 0 retweets 2 likes
    8. Rich Felker‏ @RichFelker 15 Dec 2016
      Replying to @RichFelker @whitequark @stephentyrone

      And even if you avoid the limit, once you alloca successfully, next stack frame may run out of fixed-size space.

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

      this also applies to recursive algorithms

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

      Yes. Recursion considered harmful. (Sshhh, don't tell the functional crowd.)

      12:12 PM - 15 Dec 2016
      1 reply 0 retweets 0 likes
        1. New conversation
        2. whitequark‏ @whitequark 15 Dec 2016
          Replying to @RichFelker @stephentyrone

          languages that cannot manage their stack properly considered harmful ;p

          1 reply 0 retweets 0 likes
        3. Rich Felker‏ @RichFelker 15 Dec 2016
          Replying to @whitequark @stephentyrone

          If you want a "managed stack", there go your performance benefits over using an allocator. :-)

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

          whut? I want reliable stack overflow checking, that's it

          1 reply 0 retweets 0 likes
        5. Rich Felker‏ @RichFelker 15 Dec 2016
          Replying to @whitequark @stephentyrone

          Overflow checking that traps/crashes is easy. Making () operator something that can fail & report failure is not.

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

          I plan to reserve space for unwinder state and unwind from the prologue, if panicking is enabled

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

          if unwinding on panicking is enabled* (if not then any panic at all will crash the process anyway)

          1 reply 0 retweets 0 likes
        8. Rich Felker‏ @RichFelker 15 Dec 2016
          Replying to @whitequark @stephentyrone

          Doesn't sound like a plan for producing robust sw with good ux...

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

          do you understand how error handling generally works in Rust? if not I suggest reading up on it

          1 reply 0 retweets 0 likes
        10. 2 more replies

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