dfe8bd10fe
s390x's C ABI ty_align and ty_size are not moved because the implementation of ty_align varies in an atypical pattern: it calls ty_size for the llvm::Vector type kind. ty_size then cannot be moved since it indirectly calls ty_align through align.
147 lines
4.1 KiB
Rust
147 lines
4.1 KiB
Rust
// Copyright 2016 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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// FIXME: The assumes we're using the non-vector ABI, i.e. compiling
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// for a pre-z13 machine or using -mno-vx.
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use llvm::{Integer, Pointer, Float, Double, Struct, Array, Vector};
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use abi::{align_up_to, FnType, ArgType};
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use context::CrateContext;
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use type_::Type;
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use std::cmp;
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fn align(off: usize, ty: Type) -> usize {
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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) -> usize {
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match ty.kind() {
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Integer => ((ty.int_width() as usize) + 7) / 8,
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Pointer => 8,
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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| cmp::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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Vector => ty_size(ty),
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_ => bug!("ty_align: unhandled type")
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}
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}
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fn ty_size(ty: Type) -> usize {
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match ty.kind() {
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Integer => ((ty.int_width() as usize) + 7) / 8,
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Pointer => 8,
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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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Vector => {
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let len = ty.vector_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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_ => bug!("ty_size: unhandled type")
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}
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}
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fn classify_ret_ty(ccx: &CrateContext, ret: &mut ArgType) {
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if is_reg_ty(ret.ty) {
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ret.extend_integer_width_to(64);
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} else {
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ret.make_indirect(ccx);
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}
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}
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fn classify_arg_ty(ccx: &CrateContext, arg: &mut ArgType) {
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if arg.ty.kind() == Struct {
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fn is_single_fp_element(tys: &[Type]) -> bool {
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if tys.len() != 1 {
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return false;
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}
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match tys[0].kind() {
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Float | Double => true,
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Struct => is_single_fp_element(&tys[0].field_types()),
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_ => false
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}
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}
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if is_single_fp_element(&arg.ty.field_types()) {
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match ty_size(arg.ty) {
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4 => arg.cast = Some(Type::f32(ccx)),
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8 => arg.cast = Some(Type::f64(ccx)),
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_ => arg.make_indirect(ccx)
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}
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} else {
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match ty_size(arg.ty) {
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1 => arg.cast = Some(Type::i8(ccx)),
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2 => arg.cast = Some(Type::i16(ccx)),
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4 => arg.cast = Some(Type::i32(ccx)),
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8 => arg.cast = Some(Type::i64(ccx)),
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_ => arg.make_indirect(ccx)
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}
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}
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return;
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}
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if is_reg_ty(arg.ty) {
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arg.extend_integer_width_to(64);
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} else {
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arg.make_indirect(ccx);
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}
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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 => ty_size(ty) <= 8,
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_ => false
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}
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}
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pub fn compute_abi_info(ccx: &CrateContext, fty: &mut FnType) {
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if !fty.ret.is_ignore() {
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classify_ret_ty(ccx, &mut fty.ret);
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}
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for arg in &mut fty.args {
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if arg.is_ignore() { continue; }
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classify_arg_ty(ccx, arg);
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}
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}
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