151 lines
3.9 KiB
Rust
151 lines
3.9 KiB
Rust
// 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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#[allow(non_uppercase_pattern_statics)];
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use lib::llvm::{llvm, Integer, Pointer, Float, Double, Struct, Array};
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use lib::llvm::StructRetAttribute;
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use middle::trans::cabi::{FnType, ArgType};
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use middle::trans::context::CrateContext;
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use middle::trans::type_::Type;
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use std::num;
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use std::option::{None, Some};
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fn align_up_to(off: uint, a: uint) -> uint {
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return (off + a - 1u) / a * a;
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}
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fn align(off: uint, ty: Type) -> uint {
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let a = ty_align(ty);
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return align_up_to(off, a);
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}
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fn ty_align(ty: Type) -> uint {
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match ty.kind() {
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Integer => {
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unsafe {
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((llvm::LLVMGetIntTypeWidth(ty.to_ref()) as uint) + 7) / 8
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}
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}
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Pointer => 4,
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Float => 4,
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Double => 8,
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Struct => {
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if ty.is_packed() {
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1
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} else {
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let str_tys = ty.field_types();
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str_tys.iter().fold(1, |a, t| num::max(a, ty_align(*t)))
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}
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}
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Array => {
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let elt = ty.element_type();
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ty_align(elt)
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}
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_ => fail!("ty_align: unhandled type")
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}
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}
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fn ty_size(ty: Type) -> uint {
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match ty.kind() {
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Integer => {
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unsafe {
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((llvm::LLVMGetIntTypeWidth(ty.to_ref()) as uint) + 7) / 8
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}
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}
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Pointer => 4,
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Float => 4,
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Double => 8,
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Struct => {
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if ty.is_packed() {
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let str_tys = ty.field_types();
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str_tys.iter().fold(0, |s, t| s + ty_size(*t))
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} else {
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let str_tys = ty.field_types();
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let size = str_tys.iter().fold(0, |s, t| align(s, *t) + ty_size(*t));
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align(size, ty)
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}
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}
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Array => {
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let len = ty.array_length();
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let elt = ty.element_type();
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let eltsz = ty_size(elt);
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len * eltsz
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}
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_ => fail!("ty_size: unhandled type")
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}
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}
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fn classify_ret_ty(ty: Type) -> ArgType {
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if is_reg_ty(ty) {
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return ArgType::direct(ty, None, None, None);
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}
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let size = ty_size(ty);
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if size <= 4 {
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let llty = if size <= 1 {
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Type::i8()
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} else if size <= 2 {
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Type::i16()
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} else {
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Type::i32()
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};
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return ArgType::direct(ty, Some(llty), None, None);
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}
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ArgType::indirect(ty, Some(StructRetAttribute))
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}
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fn classify_arg_ty(ty: Type) -> ArgType {
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if is_reg_ty(ty) {
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return ArgType::direct(ty, None, None, None);
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}
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let align = ty_align(ty);
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let size = ty_size(ty);
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let llty = if align <= 4 {
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Type::array(&Type::i32(), ((size + 3) / 4) as u64)
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} else {
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Type::array(&Type::i64(), ((size + 7) / 8) as u64)
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};
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ArgType::direct(ty, Some(llty), None, None)
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}
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fn is_reg_ty(ty: Type) -> bool {
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match ty.kind() {
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Integer
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| Pointer
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| Float
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| Double => true,
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_ => false
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}
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}
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pub fn compute_abi_info(_ccx: &mut CrateContext,
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atys: &[Type],
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rty: Type,
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ret_def: bool) -> FnType {
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let mut arg_tys = ~[];
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for &aty in atys.iter() {
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let ty = classify_arg_ty(aty);
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arg_tys.push(ty);
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}
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let ret_ty = if ret_def {
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classify_ret_ty(rty)
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} else {
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ArgType::direct(Type::void(), None, None, None)
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};
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return FnType {
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arg_tys: arg_tys,
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ret_ty: ret_ty,
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};
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}
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