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// Copyright 2012-2013 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.
#![allow(non_upper_case_globals)]
use llvm::{Struct, Array, Attribute};
use trans::abi::{FnType, ArgType};
use trans::context::CrateContext;
// Data layout: e-p:32:32-i64:64-v128:32:128-n32-S128
// See the https://github.com/kripken/emscripten-fastcomp-clang repository.
// The class `EmscriptenABIInfo` in `/lib/CodeGen/TargetInfo.cpp` contains the ABI definitions.
fn classify_ret_ty(ccx: &CrateContext, ret: &mut ArgType) {
match ret.ty.kind() {
Struct => {
let field_types = ret.ty.field_types();
if field_types.len() == 1 {
ret.cast = Some(field_types[0]);
} else {
ret.make_indirect(ccx);
}
}
Array => {
ret.make_indirect(ccx);
}
_ => {}
}
}
fn classify_arg_ty(ccx: &CrateContext, arg: &mut ArgType) {
if arg.ty.is_aggregate() {
arg.make_indirect(ccx);
arg.attrs.set(Attribute::ByVal);
}
}
pub fn compute_abi_info(ccx: &CrateContext, fty: &mut FnType) {
if !fty.ret.is_ignore() {
classify_ret_ty(ccx, &mut fty.ret);
}
for arg in &mut fty.args {
if arg.is_ignore() { continue; }
classify_arg_ty(ccx, arg);
}
}
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