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