55 lines
1.7 KiB
Rust
55 lines
1.7 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 std::cmp;
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use abi::{align_up_to, ArgType, FnType, LayoutExt, Reg, Uniform};
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use context::CrateContext;
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fn classify_ret_ty<'a, 'tcx>(ccx: &CrateContext<'a, 'tcx>, ret: &mut ArgType<'tcx>) {
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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(ccx);
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}
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}
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fn classify_arg_ty(ccx: &CrateContext, arg: &mut ArgType, offset: &mut u64) {
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let size = arg.layout.size(ccx);
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let mut align = arg.layout.align(ccx).abi();
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align = cmp::min(cmp::max(align, 4), 8);
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if arg.layout.is_aggregate() {
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arg.cast_to(ccx, Uniform {
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unit: Reg::i32(),
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total: size
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});
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if ((align - 1) & *offset) > 0 {
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arg.pad_with(ccx, 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 = align_up_to(*offset, align);
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*offset += align_up_to(size.bytes(), align);
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}
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pub fn compute_abi_info<'a, 'tcx>(ccx: &CrateContext<'a, 'tcx>, fty: &mut FnType<'tcx>) {
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if !fty.ret.is_ignore() {
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classify_ret_ty(ccx, &mut fty.ret);
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}
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let mut offset = if fty.ret.is_indirect() { 4 } else { 0 };
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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(ccx, arg, &mut offset);
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}
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}
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