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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").
Functions are generated as separate LLVM IR functions and translated into BPF subprogs via the LLVM bpf backend. Relocations make sure the resulting program can be loaded.
Checklist
man/adoc/bpftrace.adoc
CHANGELOG.md