49 lines
1.6 KiB
Rust
49 lines
1.6 KiB
Rust
// Copyright 2013 The Rust Project Developers. See the COPYRIGHT
|
|
// file at the top-level directory of this distribution and at
|
|
// http://rust-lang.org/COPYRIGHT.
|
|
//
|
|
// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
|
|
// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
|
|
// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
|
|
// option. This file may not be copied, modified, or distributed
|
|
// except according to those terms.
|
|
|
|
use abi::{ArgType, FnType, LayoutExt, Reg};
|
|
use common::CrateContext;
|
|
|
|
use rustc::ty::layout::Layout;
|
|
|
|
// Win64 ABI: http://msdn.microsoft.com/en-us/library/zthk2dkh.aspx
|
|
|
|
pub fn compute_abi_info<'a, 'tcx>(ccx: &CrateContext<'a, 'tcx>, fty: &mut FnType<'tcx>) {
|
|
let fixup = |a: &mut ArgType<'tcx>| {
|
|
let size = a.layout.size(ccx);
|
|
if a.layout.is_aggregate() {
|
|
match size.bits() {
|
|
8 => a.cast_to(ccx, Reg::i8()),
|
|
16 => a.cast_to(ccx, Reg::i16()),
|
|
32 => a.cast_to(ccx, Reg::i32()),
|
|
64 => a.cast_to(ccx, Reg::i64()),
|
|
_ => a.make_indirect(ccx)
|
|
};
|
|
} else {
|
|
if let Layout::Vector { .. } = *a.layout {
|
|
// FIXME(eddyb) there should be a size cap here
|
|
// (probably what clang calls "illegal vectors").
|
|
} else if size.bytes() > 8 {
|
|
a.make_indirect(ccx);
|
|
} else {
|
|
a.extend_integer_width_to(32);
|
|
}
|
|
}
|
|
};
|
|
|
|
if !fty.ret.is_ignore() {
|
|
fixup(&mut fty.ret);
|
|
}
|
|
for arg in &mut fty.args {
|
|
if arg.is_ignore() { continue; }
|
|
fixup(arg);
|
|
}
|
|
}
|