60 lines
1.8 KiB
Rust
60 lines
1.8 KiB
Rust
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// 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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// Reference: MSP430 Embedded Application Binary Interface
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// http://www.ti.com/lit/an/slaa534/slaa534.pdf
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#![allow(non_upper_case_globals)]
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use llvm::Struct;
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use abi::{self, ArgType, FnType};
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use context::CrateContext;
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use type_::Type;
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fn ty_size(ty: Type) -> usize {
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abi::ty_size(ty, 2)
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}
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// 3.5 Structures or Unions Passed and Returned by Reference
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//
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// "Structures (including classes) and unions larger than 32 bits are passed and
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// returned by reference. To pass a structure or union by reference, the caller
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// places its address in the appropriate location: either in a register or on
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// the stack, according to its position in the argument list. (..)"
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fn classify_ret_ty(ccx: &CrateContext, ret: &mut ArgType) {
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if ret.ty.kind() == Struct && ty_size(ret.ty) > 32 {
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ret.make_indirect(ccx);
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} else {
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ret.extend_integer_width_to(16);
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}
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}
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fn classify_arg_ty(ccx: &CrateContext, arg: &mut ArgType) {
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if arg.ty.kind() == Struct && ty_size(arg.ty) > 32 {
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arg.make_indirect(ccx);
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} else {
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arg.extend_integer_width_to(16);
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}
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}
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pub fn compute_abi_info(ccx: &CrateContext, fty: &mut FnType) {
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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() {
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continue;
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}
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classify_arg_ty(ccx, arg);
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}
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}
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