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Jorge Aparicio
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Dec 19, 2016
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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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#![allow(non_upper_case_globals)] | ||
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use libc::c_uint; | ||
use std::cmp; | ||
use llvm; | ||
use llvm::{Integer, Pointer, Float, Double, Vector}; | ||
use abi::{self, align_up_to, ArgType, FnType}; | ||
use context::CrateContext; | ||
use type_::Type; | ||
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fn ty_align(ty: Type) -> usize { | ||
abi::ty_align(ty, 4) | ||
} | ||
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fn ty_size(ty: Type) -> usize { | ||
abi::ty_size(ty, 4) | ||
} | ||
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fn classify_ret_ty(ccx: &CrateContext, ret: &mut ArgType) { | ||
if is_reg_ty(ret.ty) { | ||
ret.extend_integer_width_to(32); | ||
} else { | ||
ret.make_indirect(ccx); | ||
} | ||
} | ||
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fn classify_arg_ty(ccx: &CrateContext, arg: &mut ArgType, offset: &mut usize) { | ||
let orig_offset = *offset; | ||
let size = ty_size(arg.ty) * 8; | ||
let mut align = ty_align(arg.ty); | ||
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align = cmp::min(cmp::max(align, 4), 8); | ||
*offset = align_up_to(*offset, align); | ||
*offset += align_up_to(size, align * 8) / 8; | ||
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if !is_reg_ty(arg.ty) { | ||
arg.cast = Some(struct_ty(ccx, arg.ty)); | ||
arg.pad = padding_ty(ccx, align, orig_offset); | ||
} else { | ||
arg.extend_integer_width_to(32); | ||
} | ||
} | ||
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fn is_reg_ty(ty: Type) -> bool { | ||
return match ty.kind() { | ||
Integer | ||
| Pointer | ||
| Float | ||
| Double | ||
| Vector => true, | ||
_ => false | ||
}; | ||
} | ||
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fn padding_ty(ccx: &CrateContext, align: usize, offset: usize) -> Option<Type> { | ||
if ((align - 1 ) & offset) > 0 { | ||
Some(Type::i32(ccx)) | ||
} else { | ||
None | ||
} | ||
} | ||
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fn coerce_to_int(ccx: &CrateContext, size: usize) -> Vec<Type> { | ||
let int_ty = Type::i32(ccx); | ||
let mut args = Vec::new(); | ||
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let mut n = size / 32; | ||
while n > 0 { | ||
args.push(int_ty); | ||
n -= 1; | ||
} | ||
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let r = size % 32; | ||
if r > 0 { | ||
unsafe { | ||
args.push(Type::from_ref(llvm::LLVMIntTypeInContext(ccx.llcx(), r as c_uint))); | ||
} | ||
} | ||
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args | ||
} | ||
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fn struct_ty(ccx: &CrateContext, ty: Type) -> Type { | ||
let size = ty_size(ty) * 8; | ||
Type::struct_(ccx, &coerce_to_int(ccx, size), false) | ||
} | ||
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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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let mut offset = if fty.ret.is_indirect() { 4 } else { 0 }; | ||
for arg in &mut fty.args { | ||
if arg.is_ignore() { continue; } | ||
classify_arg_ty(ccx, arg, &mut offset); | ||
} | ||
} |
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