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use rustc_abi::{BackendRepr, Float, HasDataLayout, Integer, Primitive, TyAbiInterface};
use crate::callconv::{ArgAbi, FnAbi};
fn unwrap_trivial_aggregate<'a, Ty, C>(cx: &C, val: &mut ArgAbi<'a, Ty>) -> bool
where
Ty: TyAbiInterface<'a, C> + Copy,
C: HasDataLayout,
{
if val.layout.is_aggregate() {
if let Some(unit) = val.layout.homogeneous_aggregate(cx).ok().and_then(|ha| ha.unit()) {
let size = val.layout.size;
// This size check also catches over-aligned scalars as `size` will be rounded up to a
// multiple of the alignment, and the default alignment of all scalar types on wasm
// equals their size.
if unit.size == size {
val.cast_to(unit);
return true;
}
}
}
false
}
fn classify_ret<'a, Ty, C>(cx: &C, ret: &mut ArgAbi<'a, Ty>)
where
Ty: TyAbiInterface<'a, C> + Copy,
C: HasDataLayout,
{
ret.extend_integer_width_to(32);
if ret.layout.is_aggregate() && !unwrap_trivial_aggregate(cx, ret) {
ret.make_indirect();
}
// `long double`, `__int128_t` and `__uint128_t` use an indirect return
if let BackendRepr::Scalar(scalar) = ret.layout.backend_repr {
match scalar.primitive() {
Primitive::Int(Integer::I128, _) | Primitive::Float(Float::F128) => {
ret.make_indirect();
}
_ => {}
}
}
}
fn classify_arg<'a, Ty, C>(cx: &C, arg: &mut ArgAbi<'a, Ty>)
where
Ty: TyAbiInterface<'a, C> + Copy,
C: HasDataLayout,
{
if !arg.layout.is_sized() {
// Not touching this...
return;
}
arg.extend_integer_width_to(32);
if arg.layout.is_aggregate() && !unwrap_trivial_aggregate(cx, arg) {
arg.make_indirect();
}
}
/// The purpose of this ABI is to match the C ABI (aka clang) exactly.
pub(crate) fn compute_abi_info<'a, Ty, C>(cx: &C, fn_abi: &mut FnAbi<'a, Ty>)
where
Ty: TyAbiInterface<'a, C> + Copy,
C: HasDataLayout,
{
if !fn_abi.ret.is_ignore() {
classify_ret(cx, &mut fn_abi.ret);
}
for arg in fn_abi.args.iter_mut() {
if arg.is_ignore() {
continue;
}
classify_arg(cx, arg);
}
}
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