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, Struct, Array, Vector};
17 use llvm::{StructRetAttribute, ZExtAttribute};
18 use trans::cabi::{ArgType, FnType};
19 use trans::context::CrateContext;
20 use trans::type_::Type;
22 fn align_up_to(off: uint, a: uint) -> uint {
23 return (off + a - 1) / a * a;
26 fn align(off: uint, ty: Type) -> uint {
28 return align_up_to(off, a);
31 fn ty_align(ty: Type) -> uint {
33 Integer => ((ty.int_width() as uint) + 7) / 8,
41 let str_tys = ty.field_types();
42 str_tys.iter().fold(1, |a, t| cmp::max(a, ty_align(*t)))
46 let elt = ty.element_type();
50 let len = ty.vector_length();
51 let elt = ty.element_type();
54 _ => panic!("ty_align: unhandled type")
58 fn ty_size(ty: Type) -> uint {
60 Integer => ((ty.int_width() as uint) + 7) / 8,
66 let str_tys = ty.field_types();
67 str_tys.iter().fold(0, |s, t| s + ty_size(*t))
69 let str_tys = ty.field_types();
70 let size = str_tys.iter().fold(0, |s, t| align(s, *t) + ty_size(*t));
75 let len = ty.array_length();
76 let elt = ty.element_type();
77 let eltsz = ty_size(elt);
81 let len = ty.vector_length();
82 let elt = ty.element_type();
83 let eltsz = ty_size(elt);
86 _ => panic!("ty_size: unhandled type")
90 fn classify_ret_ty(ccx: &CrateContext, ty: Type) -> ArgType {
92 let attr = if ty == Type::i1(ccx) { Some(ZExtAttribute) } else { None };
93 ArgType::direct(ty, None, None, attr)
95 ArgType::indirect(ty, Some(StructRetAttribute))
99 fn classify_arg_ty(ccx: &CrateContext, ty: Type, offset: &mut uint) -> ArgType {
100 let orig_offset = *offset;
101 let size = ty_size(ty) * 8;
102 let mut align = ty_align(ty);
104 align = cmp::min(cmp::max(align, 4), 8);
105 *offset = align_up_to(*offset, align);
106 *offset += align_up_to(size, align * 8) / 8;
109 let attr = if ty == Type::i1(ccx) { Some(ZExtAttribute) } else { None };
110 ArgType::direct(ty, None, None, attr)
114 Some(struct_ty(ccx, ty)),
115 padding_ty(ccx, align, orig_offset),
121 fn is_reg_ty(ty: Type) -> bool {
122 return match ty.kind() {
132 fn padding_ty(ccx: &CrateContext, align: uint, offset: uint) -> Option<Type> {
133 if ((align - 1 ) & offset) > 0 {
140 fn coerce_to_int(ccx: &CrateContext, size: uint) -> Vec<Type> {
141 let int_ty = Type::i32(ccx);
142 let mut args = Vec::new();
144 let mut n = size / 32;
153 args.push(Type::from_ref(llvm::LLVMIntTypeInContext(ccx.llcx(), r as c_uint)));
160 fn struct_ty(ccx: &CrateContext, ty: Type) -> Type {
161 let size = ty_size(ty) * 8;
162 Type::struct_(ccx, coerce_to_int(ccx, size).as_slice(), false)
165 pub fn compute_abi_info(ccx: &CrateContext,
168 ret_def: bool) -> FnType {
169 let ret_ty = if ret_def {
170 classify_ret_ty(ccx, rty)
172 ArgType::direct(Type::void(ccx), None, None, None)
175 let sret = ret_ty.is_indirect();
176 let mut arg_tys = Vec::new();
177 let mut offset = if sret { 4 } else { 0 };
180 let ty = classify_arg_ty(ccx, *aty, &mut offset);