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I have searched here and there for this, but I could not find anything really related to it. So, I have been meaning to ask how IDA's algorithm to detect function arguments and return values works. How does IDA find the number of arguments and establish if a register is an argument of function or not? Intuitively, I can expect some analyses that look for caller-saved registers that are read before being written to say if it is a used argument or not; however, I would be more interested in the foundations of the process that let IDA determine to say if a register is, may be or is not a function argument, regardless of the ABI/platform.

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