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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. friend void‏ @volatile_void 24 Apr 2017

      Poll: does this violate strict aliasing? struct b { int x; } S; int *p = (int*)&S; *p = 1;

      8 replies 1 retweet 8 likes
      Rich Felker‏ @RichFelker 24 Apr 2017
      Replying to @volatile_void

      No. 6.7.2.1 ¶15

      5:34 AM - 24 Apr 2017
      • 1 Retweet
      • 7 Likes
      • Mako Brian Mastenbrook Steve Canon William D. Jones Alexander Tarasikov 🎃 p-zombie Damien Miller friend void Jonas Termansen
      1 reply 1 retweet 7 likes
        1. New conversation
        2. Rich Felker‏ @RichFelker 24 Apr 2017
          Replying to @RichFelker

          Found in < 1 min knowing the right phrase to grep for: "initial member".

          2 replies 1 retweet 3 likes
        3. friend void‏ @volatile_void 24 Apr 2017
          Replying to @RichFelker

          I'm not sure what this paragraph means by “points to its initial member”. One could argue that when x is an int *, (void**)&x “points to” x…

          1 reply 0 retweets 0 likes
        4. friend void‏ @volatile_void 24 Apr 2017
          Replying to @volatile_void @RichFelker

          that does not mean that you are allowed to dereference it to access a, only that if you convert both to void* and compare them, they're ==

          1 reply 0 retweets 0 likes
        5. Rich Felker‏ @RichFelker 24 Apr 2017
          Replying to @volatile_void

          If p "points to" x, and *p has type matching the effective type of x, then p meets conditions for * operator to be well-defined on it.

          1 reply 0 retweets 0 likes
        6. friend void‏ @volatile_void 24 Apr 2017
          Replying to @RichFelker

          Ok I can't produce a counter-example where a compiler will optimize more aggressively than this interpretation allows, so we'll use this.

          1 reply 0 retweets 0 likes
        7. friend void‏ @volatile_void 24 Apr 2017
          Replying to @volatile_void @RichFelker

          For reference, I think GCC devs claim it's &p->a that's wrong if one passes the address of an int or a struct s2 https://godbolt.org/g/0iLBjc 

          1 reply 0 retweets 0 likes
        8. Rich Felker‏ @RichFelker 24 Apr 2017
          Replying to @volatile_void

          6.7.2.1 ¶15 ends with "and vice versa", i.e. if you have a ptr to initial member, it's valid to cast to struct ptr & access the struct.

          1 reply 0 retweets 0 likes
        9. Rich Felker‏ @RichFelker 24 Apr 2017
          Replying to @RichFelker

          (But only if the pointer actually points to the initial member of a struct of that type, not to a different struct type or no struct at all)

          1 reply 0 retweets 1 like
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