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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. Jonas Termansen‏ @sortiecat Jul 3

      carray(1) is a tiny but flexible Sortix program that turns a binary file into a C file <https://sortix.org/man/man1/carray.1.html …> <https://gitlab.com/sortix/sortix/blob/master/carray/carray.c …> $ echo foo > bar $ carray bar unsigned char bar[] = { 0x66, 0x6F, 0x6F, 0x0A, };

      5 replies 1 retweet 9 likes
      Show this thread
    2. Rich Felker‏ @RichFelker Jul 3
      Replying to @sortiecat

      There are similar tools in https://github.com/richfelker/musl-chartable-tools …, but one particular thing I chose to do differently was not to put the outer declaration/braces inside the output file. Instead you #include it between the braces.

      2 replies 0 retweets 2 likes
    3. Elazar Leibovich‏ @elazarl Jul 4
      Replying to @RichFelker @sortiecat

      why not objcopy (generate the ELF directly), xxd --include and such. Why reinvent existing thing? At least grab their relevant piece of code, or stick to their syntax people already know.

      1 reply 0 retweets 0 likes
    4. Rich Felker‏ @RichFelker Jul 4
      Replying to @elazarl @sortiecat

      There are very very good reasons not to do the objcopy stuff. It's an awful hack that should be forgotten except as reminder not to reinvent it.

      1 reply 0 retweets 2 likes
    5. Elazar Leibovich‏ @elazarl Jul 4
      Replying to @RichFelker @sortiecat

      Can you please explain more? I liked the idea, since the old C compiler collapsed when I gave him a very long static array. Resorted to asm .data

      1 reply 0 retweets 0 likes
    6. Rich Felker‏ @RichFelker Jul 4
      Replying to @elazarl @sortiecat

      Asm .data is less awful than objcopy, but still nonportable and inherently hides the content of the data from the compiler (preventing static analysis of correctness aspects and value range based optimization).

      1 reply 1 retweet 1 like
    7. Rich Felker‏ @RichFelker Jul 4
      Replying to @RichFelker @elazarl @sortiecat

      Can't find the thread at the moment, but it was recently discussed that huge array blows up gcc's ast but huge string avoids it. Ugly but works.

      2 replies 0 retweets 0 likes
    8. Rich Felker‏ @RichFelker Jul 4
      Replying to @RichFelker @elazarl @sortiecat

      I should say huge initializer list rather than single string-literal initializer. It's an array either way.

      1 reply 0 retweets 0 likes
    9. Elazar Leibovich‏ @elazarl Jul 4
      Replying to @RichFelker @sortiecat

      So the problem is objcopy hiding the content from the compiler? Why? What about LTO? Why does it matter for a big static array? Which optimizations do you expect?

      2 replies 0 retweets 0 likes
    10. Rich Felker‏ @RichFelker Jul 4
      Replying to @elazarl @sortiecat

      Re: hiding, yes. I already mentioned static analysis & value range based optimization.

      1 reply 0 retweets 0 likes
      Rich Felker‏ @RichFelker Jul 4
      Replying to @RichFelker @elazarl @sortiecat

      Dumb example: if it's a bitrot table and your rotate operation is safe against out-of-range values, by seeing the table contents are all in-range the compiler can optimize out the range reduction.

      7:11 AM - 4 Jul 2018
      1 reply 0 retweets 0 likes
        1. New conversation
        2. Elazar Leibovich‏ @elazarl Jul 4
          Replying to @RichFelker @sortiecat

          I don't see how this kind of table would be generated from a binary file. Also, can probably be still done with LTO. Or maybe I didn't get the example.

          1 reply 0 retweets 0 likes
        3. Rich Felker‏ @RichFelker Jul 4
          Replying to @elazarl @sortiecat

          Rich Felker Retweeted Rich Felker

          LTO doesn't work at that level (only on compiler's LTO IR) and there are fundamental difficulties trying to make it work on that level. See this thread:https://twitter.com/RichFelker/status/1009284296216141825 …

          Rich Felker added,

          Rich Felker @RichFelker
          Replying to @fbOpenSource @johnregehr
          I suspect there is code which will be subtly or horribly broken by these transformations, and some of it is probably not detectable.
          1 reply 0 retweets 2 likes
        4. Rich Felker‏ @RichFelker Jul 4
          Replying to @RichFelker @elazarl @sortiecat

          I agree it's a dumb example, but you can imagine examples where the data is something like signed values that are all positive or that never achieve the minimum value (which is pathological in some ways).

          1 reply 0 retweets 0 likes
        5. Elazar Leibovich‏ @elazarl Jul 4
          Replying to @RichFelker @sortiecat

          I agree that LTO can't work on compiled code in general, but we're taking here on a static char array. LTO'ing that should be at at least possible.

          0 replies 0 retweets 0 likes
        6. End of conversation

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