Method from_str

cranelift/codegen/src/ir/extfunc.rs:274–289

(s: &str)

impl FromStr for ArgumentPurpose {
    type Err = ();
    fn from_str(s: &str) -> Result<Self, ()> {
        match s {
            "normal" => Ok(Self::Normal),
            "sret" => Ok(Self::StructReturn),
            "vmctx" => Ok(Self::VMContext),
            _ if s.starts_with("sarg(") => {
                if !s.ends_with(")") {
                    return Err(());
                }
                // Parse 'sarg(size)'
                let size: u32 = s["sarg(".len()..s.len() - 1].parse().map_err(|_| ())?;
                Ok(Self::StructArgument(size))
            }
            _ => Err(()),
        }
    }
}

/// An external function.