[Build call without name][Hw3]

[kopter0]

__dbz_sanitizer__ has void as return type
When I inserted it in with build_call , I get error message

instructions returning void cannot have a name

I have checked API documentation several times, and couldnt find build_call without name option
How to insert instruction without setting name for it?

[pacokwon]

Just putting an empty string did it for me, although I'm not sure if this is intended behavior.

[pacokwon]

I think this is the relevant code that gets executed on empty string and the behavior seems to be intended. Maybe it could be helpful!
https://github.com/llvm/llvm-project/blob/a76df78470d7994f73df0353225cbddc463cce63/llvm/lib/IR/Value.cpp#L308-L315

[Standchen]

I think the 3rd argument of build_call denotes the name of resulting variable.
If you look into LLVM assembly in .ll files, there's something you can see like:

%**div** = sdiv i32 30, %a, !dbg !18
%**div1** = sdiv i32 40, %a, !dbg !21
%**inc19** = add nsw i32 5, 1, !dbg !46

From these, I think LHS (div, div1, inc19) is the name of somewhat variables in LLVM assembly (maybe I was wrong, it could be the name of variables in LLVM IR, or whatever), and the 3rd argument of build_call gives us room to choose such name.

But since instructions(like function calls to __dbz_sanitizer__, __coverage__) returning void literally return nothing, we can't just name it. Just leaving the 3rd argument empty string ("") worked fine in my case.

[KihongHeo]

@Spielemann is right. It is okay to use "".

[kopter0]

Thx