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burntsushi5's profile
Andrew Gallant
Andrew Gallant
Andrew Gallant
@burntsushi5

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Andrew Gallant

@burntsushi5

I love to code.

Marlborough, MA
blog.burntsushi.net
Joined October 2016

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    1. Andrew Gallant‏ @burntsushi5 Apr 26
      • Report Tweet
      • Report NetzDG Violation

      Is there a way to get a Vec<u8> with an alignment (known at compile time) greater than 1? Preferably, where all subsequent uses of the Vec<u8>, including pushing and drop, are safe and correct. #rustlang (I *think* the answer is no, but it would simplify a problem I have.)

      3 replies 2 retweets 10 likes
      Show this thread
    2. neurocrypt‏ @neurocrypt Apr 27
      • Report Tweet
      • Report NetzDG Violation
      Replying to @burntsushi5

      The default allocator on the platform is *likely* to always give you something 8/16-byte aligned, right? You can replace the global allocator, to be sure. Apart from that I agree with how you see the problem.

      2 replies 0 retweets 1 like
    3. Andrew Gallant‏ @burntsushi5 Apr 27
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      Replying to @neurocrypt

      Maybe. Dunno. I would definitely want a guarantee though and do not want to rely on a particular allocator since this is in a library.

      1 reply 0 retweets 1 like
    4. neurocrypt‏ @neurocrypt Apr 27
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      Replying to @burntsushi5

      And it has to be a Vec, can it be another type or wrapper?

      1 reply 0 retweets 0 likes
      Andrew Gallant‏ @burntsushi5 Apr 27
      • Report Tweet
      • Report NetzDG Violation
      Replying to @neurocrypt

      Andrew Gallant Retweeted Andrew Gallant

      That's what I was getting at here: https://twitter.com/burntsushi5/status/1254599245480579072 … --- The problem is that you have to write the wrapper with some gnarly unsafe internals that I'm likely to get wrong. But if there's a simpler solution, I'm all ears. :-)

      Andrew Gallant added,

      Andrew Gallant @burntsushi5
      I think you could get away with allocating `Vec<T>` (where `T` has the alignment you want), then using {into,from}_raw_parts to convert between Vec<u8> as you need it. But you cannot realloc or drop with the Vec<u8>.
      Show this thread
      9:35 AM - 27 Apr 2020
      1 reply 0 retweets 0 likes
        1. New conversation
        2. neurocrypt‏ @neurocrypt Apr 27
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          Replying to @burntsushi5

          Allocing a buffer of bytes, that can't be hard :) Only problem is if you want to have the Vec methods. Slice methods we can suppy anywhere. I was thinking that an aligned slice is possible in safe code, of course, so depends on what's needed.https://gist.github.com/7851e7a679b91cd00d5f91816e9092f1 …

          1 reply 0 retweets 1 like
        3. Andrew Gallant‏ @burntsushi5 Apr 27
          • Report Tweet
          • Report NetzDG Violation
          Replying to @neurocrypt

          Yeah, I need vec methods like push. That might work though. Thanks!

          0 replies 0 retweets 0 likes
        4. End of conversation

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