1 // Copyright 2012-2013 The Rust Project Developers. See the COPYRIGHT
2 // file at the top-level directory of this distribution and at
3 // http://rust-lang.org/COPYRIGHT.
5 // Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
6 // http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
7 // <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
8 // option. This file may not be copied, modified, or distributed
9 // except according to those terms.
11 #![allow(non_upper_case_globals)]
16 use llvm
::{Integer, Pointer, Float, Double, Vector}
;
17 use abi
::{self, align_up_to, ArgType, FnType}
;
18 use context
::CrateContext
;
21 fn ty_align(ty
: Type
) -> usize {
25 fn ty_size(ty
: Type
) -> usize {
29 fn classify_ret_ty(ccx
: &CrateContext
, ret
: &mut ArgType
) {
30 if is_reg_ty(ret
.ty
) {
31 ret
.extend_integer_width_to(32);
33 ret
.make_indirect(ccx
);
37 fn classify_arg_ty(ccx
: &CrateContext
, arg
: &mut ArgType
, offset
: &mut usize) {
38 let orig_offset
= *offset
;
39 let size
= ty_size(arg
.ty
) * 8;
40 let mut align
= ty_align(arg
.ty
);
42 align
= cmp
::min(cmp
::max(align
, 4), 8);
43 *offset
= align_up_to(*offset
, align
);
44 *offset
+= align_up_to(size
, align
* 8) / 8;
46 if !is_reg_ty(arg
.ty
) {
47 arg
.cast
= Some(struct_ty(ccx
, arg
.ty
));
48 arg
.pad
= padding_ty(ccx
, align
, orig_offset
);
50 arg
.extend_integer_width_to(32);
54 fn is_reg_ty(ty
: Type
) -> bool
{
55 return match ty
.kind() {
65 fn padding_ty(ccx
: &CrateContext
, align
: usize, offset
: usize) -> Option
<Type
> {
66 if ((align
- 1 ) & offset
) > 0 {
73 fn coerce_to_int(ccx
: &CrateContext
, size
: usize) -> Vec
<Type
> {
74 let int_ty
= Type
::i32(ccx
);
75 let mut args
= Vec
::new();
77 let mut n
= size
/ 32;
86 args
.push(Type
::from_ref(llvm
::LLVMIntTypeInContext(ccx
.llcx(), r
as c_uint
)));
93 fn struct_ty(ccx
: &CrateContext
, ty
: Type
) -> Type
{
94 let size
= ty_size(ty
) * 8;
95 Type
::struct_(ccx
, &coerce_to_int(ccx
, size
), false)
98 pub fn compute_abi_info(ccx
: &CrateContext
, fty
: &mut FnType
) {
99 if !fty
.ret
.is_ignore() {
100 classify_ret_ty(ccx
, &mut fty
.ret
);
103 let mut offset
= if fty
.ret
.is_indirect() { 4 }
else { 0 }
;
104 for arg
in &mut fty
.args
{
105 if arg
.is_ignore() { continue; }
106 classify_arg_ty(ccx
, arg
, &mut offset
);