src/librustc_target/abi/call/asmjs.rs

   1 use crate::abi::call::{FnType, ArgType, Uniform};
   2 use crate::abi::{HasDataLayout, LayoutOf, TyLayout, TyLayoutMethods};
   3
   4 // Data layout: e-p:32:32-i64:64-v128:32:128-n32-S128
   5
   6 // See the https://github.com/kripken/emscripten-fastcomp-clang repository.
   7 // The class `EmscriptenABIInfo` in `/lib/CodeGen/TargetInfo.cpp` contains the ABI definitions.
   8
   9 fn classify_ret_ty<'a, Ty, C>(cx: &C, ret: &mut ArgType<'a, Ty>)
  10     where Ty: TyLayoutMethods<'a, C> + Copy,
  11           C: LayoutOf<Ty = Ty, TyLayout = TyLayout<'a, Ty>> + HasDataLayout
  12 {
  13     if ret.layout.is_aggregate() {
  14         if let Some(unit) = ret.layout.homogeneous_aggregate(cx).unit() {
  15             let size = ret.layout.size;
  16             if unit.size == size {
  17                 ret.cast_to(Uniform {
  18                     unit,
  19                     total: size
  20                 });
  21                 return;
  22             }
  23         }
  24
  25         ret.make_indirect();
  26     }
  27 }
  28
  29 fn classify_arg_ty<Ty>(arg: &mut ArgType<'_, Ty>) {
  30     if arg.layout.is_aggregate() {
  31         arg.make_indirect_byval();
  32     }
  33 }
  34
  35 pub fn compute_abi_info<'a, Ty, C>(cx: &C, fty: &mut FnType<'a, Ty>)
  36     where Ty: TyLayoutMethods<'a, C> + Copy,
  37           C: LayoutOf<Ty = Ty, TyLayout = TyLayout<'a, Ty>> + HasDataLayout
  38 {
  39     if !fty.ret.is_ignore() {
  40         classify_ret_ty(cx, &mut fty.ret);
  41     }
  42
  43     for arg in &mut fty.args {
  44         if arg.is_ignore() { continue; }
  45         classify_arg_ty(arg);
  46     }
  47 }