/
cabi_x86.rs
84 lines (75 loc) · 2.36 KB
/
cabi_x86.rs
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
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
// 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 core::prelude::*;
use driver::session::{os_win32, os_macos};
use lib::llvm::*;
use super::cabi::*;
use super::common::*;
use super::machine::*;
use middle::trans::type_::Type;
struct X86_ABIInfo {
ccx: @mut CrateContext
}
impl ABIInfo for X86_ABIInfo {
fn compute_info(&self,
atys: &[Type],
rty: Type,
ret_def: bool) -> FnType {
let mut arg_tys = do atys.map |a| {
LLVMType { cast: false, ty: *a }
};
let mut ret_ty = LLVMType {
cast: false,
ty: rty
};
let mut attrs = do atys.map |_| {
None
};
// Rules for returning structs taken from
// http://www.angelcode.com/dev/callconv/callconv.html
// Clang's ABI handling is in lib/CodeGen/TargetInfo.cpp
let sret = {
let returning_a_struct = rty.kind() == Struct && ret_def;
let big_struct = match self.ccx.sess.targ_cfg.os {
os_win32 | os_macos => llsize_of_alloc(self.ccx, rty) > 8,
_ => true
};
returning_a_struct && big_struct
};
if sret {
let ret_ptr_ty = LLVMType {
cast: false,
ty: ret_ty.ty.ptr_to()
};
arg_tys = ~[ret_ptr_ty] + arg_tys;
attrs = ~[Some(StructRetAttribute)] + attrs;
ret_ty = LLVMType {
cast: false,
ty: Type::void(),
};
} else if !ret_def {
ret_ty = LLVMType {
cast: false,
ty: Type::void()
};
}
return FnType {
arg_tys: arg_tys,
ret_ty: ret_ty,
attrs: attrs,
sret: sret
};
}
}
pub fn abi_info(ccx: @mut CrateContext) -> @ABIInfo {
return @X86_ABIInfo {
ccx: ccx
} as @ABIInfo;
}