| // Copyright 2016 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 abi::{ArgType, FnType, LayoutExt, Reg, Uniform}; |
| use context::CrateContext; |
| |
| use rustc::ty::layout::Size; |
| |
| fn classify_ret_ty<'a, 'tcx>(ccx: &CrateContext<'a, 'tcx>, |
| ret: &mut ArgType<'tcx>, |
| offset: &mut Size) { |
| if !ret.layout.is_aggregate() { |
| ret.extend_integer_width_to(64); |
| } else { |
| ret.make_indirect(); |
| *offset += ccx.tcx().data_layout.pointer_size; |
| } |
| } |
| |
| fn classify_arg_ty(ccx: &CrateContext, arg: &mut ArgType, offset: &mut Size) { |
| let dl = &ccx.tcx().data_layout; |
| let size = arg.layout.size; |
| let align = arg.layout.align.max(dl.i32_align).min(dl.i64_align); |
| |
| if arg.layout.is_aggregate() { |
| arg.cast_to(Uniform { |
| unit: Reg::i64(), |
| total: size |
| }); |
| if !offset.is_abi_aligned(align) { |
| arg.pad_with(Reg::i64()); |
| } |
| } else { |
| arg.extend_integer_width_to(64); |
| } |
| |
| *offset = offset.abi_align(align) + size.abi_align(align); |
| } |
| |
| pub fn compute_abi_info<'a, 'tcx>(ccx: &CrateContext<'a, 'tcx>, fty: &mut FnType<'tcx>) { |
| let mut offset = Size::from_bytes(0); |
| if !fty.ret.is_ignore() { |
| classify_ret_ty(ccx, &mut fty.ret, &mut offset); |
| } |
| |
| for arg in &mut fty.args { |
| if arg.is_ignore() { continue; } |
| classify_arg_ty(ccx, arg, &mut offset); |
| } |
| } |