53 lines
1.7 KiB
Rust
53 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 abi::{FnType, ArgType, ArgAttribute, LayoutExt, Uniform};
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use context::CrateContext;
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// Data layout: e-p:32:32-i64:64-v128:32:128-n32-S128
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// See the https://github.com/kripken/emscripten-fastcomp-clang repository.
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// The class `EmscriptenABIInfo` in `/lib/CodeGen/TargetInfo.cpp` contains the ABI definitions.
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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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if let Some(unit) = ret.layout.homogeneous_aggregate(ccx) {
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let size = ret.layout.size(ccx);
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if unit.size == size {
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ret.cast_to(ccx, Uniform {
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unit,
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total: size
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});
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return;
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}
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}
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ret.make_indirect(ccx);
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}
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}
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fn classify_arg_ty<'a, 'tcx>(ccx: &CrateContext<'a, 'tcx>, arg: &mut ArgType<'tcx>) {
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if arg.layout.is_aggregate() {
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arg.make_indirect(ccx);
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arg.attrs.set(ArgAttribute::ByVal);
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}
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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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for arg in &mut fty.args {
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if arg.is_ignore() { continue; }
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classify_arg_ty(ccx, arg);
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}
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}
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