rustc_target/callconv/
mips.rs

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
use crate::abi::call::{ArgAbi, FnAbi, Reg, Uniform};
use crate::abi::{HasDataLayout, Size};

fn classify_ret<Ty, C>(cx: &C, ret: &mut ArgAbi<'_, Ty>, offset: &mut Size)
where
    C: HasDataLayout,
{
    if !ret.layout.is_aggregate() {
        ret.extend_integer_width_to(32);
    } else {
        ret.make_indirect();
        *offset += cx.data_layout().pointer_size;
    }
}

fn classify_arg<Ty, C>(cx: &C, arg: &mut ArgAbi<'_, Ty>, offset: &mut Size)
where
    C: HasDataLayout,
{
    if !arg.layout.is_sized() {
        // Not touching this...
        return;
    }
    let dl = cx.data_layout();
    let size = arg.layout.size;
    let align = arg.layout.align.max(dl.i32_align).min(dl.i64_align).abi;

    if arg.layout.is_aggregate() {
        let pad_i32 = !offset.is_aligned(align);
        arg.cast_to_and_pad_i32(Uniform::new(Reg::i32(), size), pad_i32);
    } else {
        arg.extend_integer_width_to(32);
    }

    *offset = offset.align_to(align) + size.align_to(align);
}

pub(crate) fn compute_abi_info<Ty, C>(cx: &C, fn_abi: &mut FnAbi<'_, Ty>)
where
    C: HasDataLayout,
{
    let mut offset = Size::ZERO;
    if !fn_abi.ret.is_ignore() {
        classify_ret(cx, &mut fn_abi.ret, &mut offset);
    }

    for arg in fn_abi.args.iter_mut() {
        if arg.is_ignore() {
            continue;
        }
        classify_arg(cx, arg, &mut offset);
    }
}