Method make_ret_area

winch/codegen/src/codegen/call.rs:116–130

Calculates the return area for the callee, if any.

(
        callee_sig: &ABISig,
        masm: &mut M,
    )

    /// Calculates the return area for the callee, if any.
    fn make_ret_area<M: MacroAssembler>(
        callee_sig: &ABISig,
        masm: &mut M,
    ) -> Result<Option<RetArea>> {
        if callee_sig.has_stack_results() {
            let base = masm.sp_offset()?.as_u32();
            let end = base + callee_sig.results_stack_size();
            if end > base {
                masm.reserve_stack(end - base)?;
            }
            Ok(Some(RetArea::sp(SPOffset::from_u32(end))))
        } else {
            Ok(None)
        }
    }

    /// Lowers the high-level [`Callee`] to a [`CalleeKind`] and
    /// [ContextArgs] pair which contains all the metadata needed for