1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
|
// Copyright 2012-2013 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 std::cmp;
use abi::{align_up_to, ArgType, FnType, LayoutExt, Reg, Uniform};
use context::CrateContext;
fn classify_ret_ty<'a, 'tcx>(ccx: &CrateContext<'a, 'tcx>, ret: &mut ArgType<'tcx>) {
if !ret.layout.is_aggregate() {
ret.extend_integer_width_to(32);
} else {
ret.make_indirect(ccx);
}
}
fn classify_arg_ty(ccx: &CrateContext, arg: &mut ArgType, offset: &mut u64) {
let size = arg.layout.size(ccx);
let mut align = arg.layout.align(ccx).abi();
align = cmp::min(cmp::max(align, 4), 8);
if arg.layout.is_aggregate() {
arg.cast_to(ccx, Uniform {
unit: Reg::i32(),
total: size
});
if ((align - 1) & *offset) > 0 {
arg.pad_with(ccx, Reg::i32());
}
} else {
arg.extend_integer_width_to(32);
}
*offset = align_up_to(*offset, align);
*offset += align_up_to(size.bytes(), align);
}
pub fn compute_abi_info<'a, 'tcx>(ccx: &CrateContext<'a, 'tcx>, fty: &mut FnType<'tcx>) {
if !fty.ret.is_ignore() {
classify_ret_ty(ccx, &mut fty.ret);
}
let mut offset = if fty.ret.is_indirect() { 4 } else { 0 };
for arg in &mut fty.args {
if arg.is_ignore() { continue; }
classify_arg_ty(ccx, arg, &mut offset);
}
}
|
