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| 1 | +// Copyright 2012-2013 The Rust Project Developers. See the COPYRIGHT |
| 2 | +// file at the top-level directory of this distribution and at |
| 3 | +// http://rust-lang.org/COPYRIGHT. |
| 4 | +// |
| 5 | +// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or |
| 6 | +// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license |
| 7 | +// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your |
| 8 | +// option. This file may not be copied, modified, or distributed |
| 9 | +// except according to those terms. |
| 10 | + |
| 11 | +// Reference: MSP430 Embedded Application Binary Interface |
| 12 | +// http://www.ti.com/lit/an/slaa534/slaa534.pdf |
| 13 | + |
| 14 | +#![allow(non_upper_case_globals)] |
| 15 | + |
| 16 | +use llvm::Struct; |
| 17 | + |
| 18 | +use abi::{self, ArgType, FnType}; |
| 19 | +use context::CrateContext; |
| 20 | +use type_::Type; |
| 21 | + |
| 22 | +fn ty_size(ty: Type) -> usize { |
| 23 | + abi::ty_size(ty, 2) |
| 24 | +} |
| 25 | + |
| 26 | +// 3.5 Structures or Unions Passed and Returned by Reference |
| 27 | +// |
| 28 | +// "Structures (including classes) and unions larger than 32 bits are passed and |
| 29 | +// returned by reference. To pass a structure or union by reference, the caller |
| 30 | +// places its address in the appropriate location: either in a register or on |
| 31 | +// the stack, according to its position in the argument list. (..)" |
| 32 | +fn classify_ret_ty(ccx: &CrateContext, ret: &mut ArgType) { |
| 33 | + if ret.ty.kind() == Struct && ty_size(ret.ty) > 32 { |
| 34 | + ret.make_indirect(ccx); |
| 35 | + } else { |
| 36 | + ret.extend_integer_width_to(16); |
| 37 | + } |
| 38 | +} |
| 39 | + |
| 40 | +fn classify_arg_ty(ccx: &CrateContext, arg: &mut ArgType) { |
| 41 | + if arg.ty.kind() == Struct && ty_size(arg.ty) > 32 { |
| 42 | + arg.make_indirect(ccx); |
| 43 | + } else { |
| 44 | + arg.extend_integer_width_to(16); |
| 45 | + } |
| 46 | +} |
| 47 | + |
| 48 | +pub fn compute_abi_info(ccx: &CrateContext, fty: &mut FnType) { |
| 49 | + if !fty.ret.is_ignore() { |
| 50 | + classify_ret_ty(ccx, &mut fty.ret); |
| 51 | + } |
| 52 | + |
| 53 | + for arg in &mut fty.args { |
| 54 | + if arg.is_ignore() { |
| 55 | + continue; |
| 56 | + } |
| 57 | + classify_arg_ty(ccx, arg); |
| 58 | + } |
| 59 | +} |
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