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Jorge Aparicio
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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. | ||
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// Reference: MSP430 Embedded Application Binary Interface | ||
// 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}; | ||
use context::CrateContext; | ||
use type_::Type; | ||
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fn ty_size(ty: Type) -> usize { | ||
abi::ty_size(ty, 2) | ||
} | ||
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// 3.5 Structures or Unions Passed and Returned by Reference | ||
// | ||
// "Structures (including classes) and unions larger than 32 bits are passed and | ||
// returned by reference. To pass a structure or union by reference, the caller | ||
// places its address in the appropriate location: either in a register or on | ||
// the stack, according to its position in the argument list. (..)" | ||
fn classify_ret_ty(ccx: &CrateContext, ret: &mut ArgType) { | ||
if ret.ty.kind() == Struct && ty_size(ret.ty) > 32 { | ||
ret.make_indirect(ccx); | ||
} else { | ||
ret.extend_integer_width_to(16); | ||
} | ||
} | ||
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fn classify_arg_ty(ccx: &CrateContext, arg: &mut ArgType) { | ||
if arg.ty.kind() == Struct && ty_size(arg.ty) > 32 { | ||
arg.make_indirect(ccx); | ||
} else { | ||
arg.extend_integer_width_to(16); | ||
} | ||
} | ||
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pub fn compute_abi_info(ccx: &CrateContext, fty: &mut FnType) { | ||
if !fty.ret.is_ignore() { | ||
classify_ret_ty(ccx, &mut fty.ret); | ||
} | ||
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for arg in &mut fty.args { | ||
if arg.is_ignore() { | ||
continue; | ||
} | ||
classify_arg_ty(ccx, arg); | ||
} | ||
} |
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