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use llvm::{Integer, Pointer, Float, Double, Struct, Array, Vector};
use abi::{align_up_to, FnType, ArgType};
use context::CrateContext;
use type_::Type;
use std::cmp;
fn align(off: usize, ty: Type) -> usize {
let a = ty_align(ty);
return align_up_to(off, a);
}
fn ty_align(ty: Type) -> usize {
match ty.kind() {
Integer => ((ty.int_width() as usize) + 7) / 8,
Pointer => 8,
Float => 4,
Double => 8,
Struct => {
if ty.is_packed() {
1
} else {
let str_tys = ty.field_types();
str_tys.iter().fold(1, |a, t| cmp::max(a, ty_align(*t)))
}
}
Array => {
let elt = ty.element_type();
ty_align(elt)
}
Vector => ty_size(ty),
_ => bug!("ty_align: unhandled type")
}
}
fn ty_size(ty: Type) -> usize {
match ty.kind() {
Integer => ((ty.int_width() as usize) + 7) / 8,
Pointer => 8,
Float => 4,
Double => 8,
Struct => {
if ty.is_packed() {
let str_tys = ty.field_types();
str_tys.iter().fold(0, |s, t| s + ty_size(*t))
} else {
let str_tys = ty.field_types();
let size = str_tys.iter().fold(0, |s, t| align(s, *t) + ty_size(*t));
align(size, ty)
}
}
Array => {
let len = ty.array_length();
let elt = ty.element_type();
let eltsz = ty_size(elt);
len * eltsz
}
Vector => {
let len = ty.vector_length();
let elt = ty.element_type();
let eltsz = ty_size(elt);
len * eltsz
}
_ => bug!("ty_size: unhandled type")
}
}
fn classify_ret_ty(ccx: &CrateContext, ret: &mut ArgType) {
if is_reg_ty(ret.ty) {
ret.extend_integer_width_to(64);
} else {
ret.make_indirect(ccx);
}
}
fn classify_arg_ty(ccx: &CrateContext, arg: &mut ArgType) {
if arg.ty.kind() == Struct {
fn is_single_fp_element(tys: &[Type]) -> bool {
if tys.len() != 1 {
return false;
}
match tys[0].kind() {
Float | Double => true,
Struct => is_single_fp_element(&tys[0].field_types()),
_ => false
}
}
if is_single_fp_element(&arg.ty.field_types()) {
match ty_size(arg.ty) {
4 => arg.cast = Some(Type::f32(ccx)),
8 => arg.cast = Some(Type::f64(ccx)),
_ => arg.make_indirect(ccx)
}
} else {
match ty_size(arg.ty) {
1 => arg.cast = Some(Type::i8(ccx)),
2 => arg.cast = Some(Type::i16(ccx)),
4 => arg.cast = Some(Type::i32(ccx)),
8 => arg.cast = Some(Type::i64(ccx)),
_ => arg.make_indirect(ccx)
}
}
return;
}
if is_reg_ty(arg.ty) {
arg.extend_integer_width_to(64);
} else {
arg.make_indirect(ccx);
}
}
fn is_reg_ty(ty: Type) -> bool {
match ty.kind() {
Integer
| Pointer
| Float
| Double => ty_size(ty) <= 8,
_ => false
}
}
pub fn compute_abi_info(ccx: &CrateContext, fty: &mut FnType) {
if !fty.ret.is_ignore() {
classify_ret_ty(ccx, &mut fty.ret);
}
for arg in &mut fty.args {
if arg.is_ignore() { continue; }
classify_arg_ty(ccx, arg);
}
}