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   Jann Horn (jann@infosec.exchange)'s status on Saturday, 29-Mar-2025 07:18:57 JST Jann Horn

   Wow, __builtin_dump_struct is an amazing clang feature, how did I never hear about this before?

   $ cat test.c
   #include <stdio.h>
   
   struct nested {
   int n;
   };
   struct foo {
   int member_a;
   unsigned long member_b;
   char *str;
   void *ptr;
   struct nested nested;
   };
   
   int main(void) {
   struct foo f = {
   .member_a = 123,
   .member_b = 0x4141414141414141,
   .str = "foobar",
   .ptr = &f,
   .nested = {.n = 42}
   };
   __builtin_dump_struct(&f, printf);
   }
   $ clang -o test test.c && ./test
   struct foo {
   int member_a = 123
   unsigned long member_b = 4702111234474983745
   char * str = "foobar"
   void * ptr = 0x7fff1df41b78
   struct nested nested = {
   int n = 42
   }
   }
   

   The original version of this feature was introduced back in 2018 (though it was reimplemented since in 2022).

   • Haelwenn /элвэн/ :triskell: likes this.
   • Embed this notice
     Ryan Castellucci :nonbinary_flag: (ryanc@infosec.exchange)'s status on Saturday, 29-Mar-2025 19:49:49 JST Ryan Castellucci :nonbinary_flag:

     in reply to

     @jann wow this is amazeballs