rust/src/librustc_trans/cabi_x86_win64.rs

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);
}
}