4815f7e668
We need to supply sext/zext attributes to LLVM to ensure that arguments are extended to the appropriate width in the correct way. Most platforms extend integers less than 32 bits, though not all.
54 lines
1.9 KiB
Rust
54 lines
1.9 KiB
Rust
// 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 abi::FnType;
|
|
use type_::Type;
|
|
use super::common::*;
|
|
use super::machine::*;
|
|
|
|
pub fn compute_abi_info(ccx: &CrateContext, fty: &mut FnType) {
|
|
if !fty.ret.is_ignore() {
|
|
if 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);
|
|
}
|
|
} else {
|
|
fty.ret.extend_integer_width_to(32);
|
|
}
|
|
}
|
|
|
|
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);
|
|
} else {
|
|
arg.extend_integer_width_to(32);
|
|
}
|
|
}
|
|
}
|