58 lines
1.8 KiB
Rust
58 lines
1.8 KiB
Rust
// Copyright 2012-2013 The Rust Project Developers. See the COPYRIGHT
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// file at the top-level directory of this distribution and at
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// http://rust-lang.org/COPYRIGHT.
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//
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// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
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// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
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// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
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// option. This file may not be copied, modified, or distributed
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// except according to those terms.
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use abi::{ArgType, FnType, LayoutExt, Reg, Uniform};
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use context::CodegenCx;
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use rustc::ty::layout::Size;
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fn classify_ret_ty<'a, 'tcx>(cx: &CodegenCx<'a, 'tcx>,
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ret: &mut ArgType<'tcx>,
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offset: &mut Size) {
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if !ret.layout.is_aggregate() {
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ret.extend_integer_width_to(32);
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} else {
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ret.make_indirect();
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*offset += cx.tcx.data_layout.pointer_size;
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}
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}
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fn classify_arg_ty(cx: &CodegenCx, arg: &mut ArgType, offset: &mut Size) {
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let dl = &cx.tcx.data_layout;
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let size = arg.layout.size;
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let align = arg.layout.align.max(dl.i32_align).min(dl.i64_align);
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if arg.layout.is_aggregate() {
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arg.cast_to(Uniform {
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unit: Reg::i32(),
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total: size
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});
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if !offset.is_abi_aligned(align) {
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arg.pad_with(Reg::i32());
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}
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} else {
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arg.extend_integer_width_to(32);
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}
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*offset = offset.abi_align(align) + size.abi_align(align);
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}
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pub fn compute_abi_info<'a, 'tcx>(cx: &CodegenCx<'a, 'tcx>, fty: &mut FnType<'tcx>) {
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let mut offset = Size::from_bytes(0);
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if !fty.ret.is_ignore() {
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classify_ret_ty(cx, &mut fty.ret, &mut offset);
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}
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for arg in &mut fty.args {
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if arg.is_ignore() { continue; }
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classify_arg_ty(cx, arg, &mut offset);
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}
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}
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