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// Copyright 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.
use llvm::*;
use trans::abi::FnType;
use trans::type_::Type;
use super::common::*;
use super::machine::*;
pub fn compute_abi_info(ccx: &CrateContext, fty: &mut FnType) {
if !fty.ret.is_ignore() && fty.ret.ty.kind() == Struct {
// Returning a structure. Most often, this will use
// a hidden first argument. On some platforms, though,
// small structs are returned as integers.
//
// Some links:
// http://www.angelcode.com/dev/callconv/callconv.html
// Clang's ABI handling is in lib/CodeGen/TargetInfo.cpp
let t = &ccx.sess().target.target;
if t.options.is_like_osx || t.options.is_like_windows {
match llsize_of_alloc(ccx, fty.ret.ty) {
1 => fty.ret.cast = Some(Type::i8(ccx)),
2 => fty.ret.cast = Some(Type::i16(ccx)),
4 => fty.ret.cast = Some(Type::i32(ccx)),
8 => fty.ret.cast = Some(Type::i64(ccx)),
_ => fty.ret.make_indirect(ccx)
}
} else {
fty.ret.make_indirect(ccx);
}
}
for arg in &mut fty.args {
if arg.is_ignore() { continue; }
if arg.ty.kind() == Struct {
arg.make_indirect(ccx);
arg.attrs.set(Attribute::ByVal);
}
}
}
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