src/librustc_trans/cabi_sparc.rs

   1 // Copyright 2012-2013 The Rust Project Developers. See the COPYRIGHT
   2 // file at the top-level directory of this distribution and at
   3 // http://rust-lang.org/COPYRIGHT.
   4 //
   5 // Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
   6 // http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
   7 // <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
   8 // option. This file may not be copied, modified, or distributed
   9 // except according to those terms.
  10
  11 use abi::{ArgType, FnType, LayoutExt, Reg, Uniform};
  12 use context::CodegenCx;
  13
  14 use rustc::ty::layout::Size;
  15
  16 fn classify_ret_ty<'a, 'tcx>(cx: &CodegenCx<'a, 'tcx>,
  17                              ret: &mut ArgType<'tcx>,
  18                              offset: &mut Size) {
  19     if !ret.layout.is_aggregate() {
  20         ret.extend_integer_width_to(32);
  21     } else {
  22         ret.make_indirect();
  23         *offset += cx.tcx.data_layout.pointer_size;
  24     }
  25 }
  26
  27 fn classify_arg_ty(cx: &CodegenCx, arg: &mut ArgType, offset: &mut Size) {
  28     let dl = &cx.tcx.data_layout;
  29     let size = arg.layout.size;
  30     let align = arg.layout.align.max(dl.i32_align).min(dl.i64_align);
  31
  32     if arg.layout.is_aggregate() {
  33         arg.cast_to(Uniform {
  34             unit: Reg::i32(),
  35             total: size
  36         });
  37         if !offset.is_abi_aligned(align) {
  38             arg.pad_with(Reg::i32());
  39         }
  40     } else {
  41         arg.extend_integer_width_to(32);
  42     }
  43
  44     *offset = offset.abi_align(align) + size.abi_align(align);
  45 }
  46
  47 pub fn compute_abi_info<'a, 'tcx>(cx: &CodegenCx<'a, 'tcx>, fty: &mut FnType<'tcx>) {
  48     let mut offset = Size::from_bytes(0);
  49     if !fty.ret.is_ignore() {
  50         classify_ret_ty(cx, &mut fty.ret, &mut offset);
  51     }
  52
  53     for arg in &mut fty.args {
  54         if arg.is_ignore() { continue; }
  55         classify_arg_ty(cx, arg, &mut offset);
  56     }
  57 }