Method alloc

core/src/compiler/syms.rs:524–549

Allocates a new temporary register.

(&mut self)

    /// Allocates a new temporary register.
    pub(crate) fn alloc(&mut self) -> Result<Register> {
        let temp;
        let new_next_temp;
        {
            let mut next_temp = self.next_temp.borrow_mut();
            temp = *next_temp;
            self.ntemps += 1;
            new_next_temp = match next_temp.checked_add(1) {
                Some(reg) => reg,
                None => return Err(Error::OutOfRegisters(RegisterScope::Temp)),
            };
            *next_temp = new_next_temp;
        }

        {
            let mut count_temps = self.count_temps.borrow_mut();
            *count_temps = max(*count_temps, new_next_temp);
        }

        match u8::try_from(usize::from(self.nlocals) + usize::from(temp)) {
            Ok(reg) => {
                Ok(Register::local(reg).map_err(|_| Error::OutOfRegisters(RegisterScope::Temp))?)
            }
            Err(_) => Err(Error::OutOfRegisters(RegisterScope::Temp)),
        }
    }
}

#[cfg(test)]