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// Reference: MSP430 Embedded Application Binary Interface
// https://www.ti.com/lit/an/slaa534a/slaa534a.pdf
use crate::abi::call::{ArgAbi, FnAbi};
// 3.5 Structures or Unions Passed and Returned by Reference
//
// "Structures (including classes) and unions larger than 32 bits are passed and
// returned by reference. To pass a structure or union by reference, the caller
// places its address in the appropriate location: either in a register or on
// the stack, according to its position in the argument list. (..)"
fn classify_ret<Ty>(ret: &mut ArgAbi<'_, Ty>) {
if ret.layout.is_aggregate() && ret.layout.size.bits() > 32 {
ret.make_indirect();
} else {
ret.extend_integer_width_to(16);
}
}
fn classify_arg<Ty>(arg: &mut ArgAbi<'_, Ty>) {
if arg.layout.is_aggregate() && arg.layout.size.bits() > 32 {
arg.make_indirect();
} else {
arg.extend_integer_width_to(16);
}
}
pub fn compute_abi_info<Ty>(fn_abi: &mut FnAbi<'_, Ty>) {
if !fn_abi.ret.is_ignore() {
classify_ret(&mut fn_abi.ret);
}
for arg in fn_abi.args.iter_mut() {
if arg.is_ignore() {
continue;
}
classify_arg(arg);
}
}
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