Commits on May 19, 2024

1. Add user function call support …

   Function defined by the user can now be called in the same ways as built-in
   functions, for example:
   
   fn add($a: int64, $b: int64): int64 {
     return $a + $b;
   }
   
   BEGIN {
     print(add(5, 9));
   }
   
   If a function of the same name as an existing built-in is defined, it
   overrides the built-in and a warning is printed.
   
   Implementation-wise, the functionality depends on existing relocations
   against subprogs implemented in commit d345d06 ("Implement relocations
   against .text for subprogs"). Those are extended to also support R_BPF_64_32
   relocations used for direct calls in addition to R_BPF_64_64 used for
   indirect calls.
   
   Functions are generated as separate LLVM IR functions and translated into
   BPF subprogs via the LLVM bpf backend. Inlining of those function is
   disabled to prevent aggressive LLVM optimizations turning recursion into
   iteration, which could be rejected by the verifier.

   

   lenticularis39 committed May 19, 2024
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