1 use crate::abi::call::{ArgAbi, FnAbi, Uniform};
2 use crate::abi::{HasDataLayout, LayoutOf, TyAndLayout, TyAndLayoutMethods};
4 fn unwrap_trivial_aggregate<'a, Ty, C>(cx: &C, val: &mut ArgAbi<'a, Ty>) -> bool
6 Ty: TyAndLayoutMethods<'a, C> + Copy,
7 C: LayoutOf<'a, Ty = Ty, TyAndLayout = TyAndLayout<'a, Ty>> + HasDataLayout,
9 if val.layout.is_aggregate() {
10 if let Some(unit) = val.layout.homogeneous_aggregate(cx).ok().and_then(|ha| ha.unit()) {
11 let size = val.layout.size;
12 if unit.size == size {
13 val.cast_to(Uniform { unit, total: size });
21 fn classify_ret<'a, Ty, C>(cx: &C, ret: &mut ArgAbi<'a, Ty>)
23 Ty: TyAndLayoutMethods<'a, C> + Copy,
24 C: LayoutOf<'a, Ty = Ty, TyAndLayout = TyAndLayout<'a, Ty>> + HasDataLayout,
26 ret.extend_integer_width_to(32);
27 if ret.layout.is_aggregate() && !unwrap_trivial_aggregate(cx, ret) {
32 fn classify_arg<'a, Ty, C>(cx: &C, arg: &mut ArgAbi<'a, Ty>)
34 Ty: TyAndLayoutMethods<'a, C> + Copy,
35 C: LayoutOf<'a, Ty = Ty, TyAndLayout = TyAndLayout<'a, Ty>> + HasDataLayout,
37 arg.extend_integer_width_to(32);
38 if arg.layout.is_aggregate() && !unwrap_trivial_aggregate(cx, arg) {
39 arg.make_indirect_byval();
43 /// The purpose of this ABI is to match the C ABI (aka clang) exactly.
44 pub fn compute_c_abi_info<'a, Ty, C>(cx: &C, fn_abi: &mut FnAbi<'a, Ty>)
46 Ty: TyAndLayoutMethods<'a, C> + Copy,
47 C: LayoutOf<'a, Ty = Ty, TyAndLayout = TyAndLayout<'a, Ty>> + HasDataLayout,
49 if !fn_abi.ret.is_ignore() {
50 classify_ret(cx, &mut fn_abi.ret);
53 for arg in &mut fn_abi.args {
57 classify_arg(cx, arg);
61 /// The purpose of this ABI is for matching the WebAssembly standard. This
62 /// intentionally diverges from the C ABI and is specifically crafted to take
63 /// advantage of LLVM's support of multiple returns in WebAssembly.
64 pub fn compute_wasm_abi_info<Ty>(fn_abi: &mut FnAbi<'_, Ty>) {
65 if !fn_abi.ret.is_ignore() {
66 classify_ret(&mut fn_abi.ret);
69 for arg in &mut fn_abi.args {
76 fn classify_ret<Ty>(ret: &mut ArgAbi<'_, Ty>) {
77 ret.extend_integer_width_to(32);
80 fn classify_arg<Ty>(arg: &mut ArgAbi<'_, Ty>) {
81 arg.extend_integer_width_to(32);