[Question][Hw7] How to get callee function name in call opcode instruction?

[sjoon2455]

Hi, I would like to extract f from %call = call i32 @f(i32 %7).
I tried:

1. Llvm.operand instr 0 -> output: %7
2. Llvm.value_name instr -> output: call

What is an appropriate API to get f?
Thanks in advance(_ _)

[mekty2012]

You can use last element of Llvm.operand instr.
Check following source code of Llvmutils.
https://github.com/prosyslab-classroom/llvmutils/blob/df744f72deef6a9af133c8e0920c4c0babfc9de9/src/llvmutils.ml#L143

[sjoon2455]

@mekty2012 Thank you! I forgot to check Llvmutils 😅 Thanks again!

[sjoon2455]

@mekty2012, I have a question. Can you call Llvmutils.function_name in a code without error?

[mekty2012]

@sjoon2455 I had no problem when using it, but I got similar issue before.
Are you having segmentation fault? If so, it can happen when you are calling it to llvalue that is not contained in some function, like a constant integer.
(It will return Null for such llvalue, then it will create segfault later.)

[sjoon2455]

@mekty2012 Not even a segmentation fault. If I type Llvmutils.function_name, it says not defined with red line.
Since I can just implement it inline, it's not a big deal!
Thanks!