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