2 use rustc::hir::def_id::DefId;
3 use rustc::hir::itemlikevisit::ItemLikeVisitor;
4 use rustc::hir::ItemKind;
5 use rustc::ty::layout::HasDataLayout;
6 use rustc::ty::layout::HasTyCtxt;
7 use rustc::ty::layout::LayoutOf;
8 use rustc::ty::layout::TargetDataLayout;
9 use rustc::ty::layout::TyLayout;
10 use rustc::ty::layout::HasParamEnv;
11 use rustc::ty::ParamEnv;
13 use rustc::ty::TyCtxt;
14 use syntax::ast::Attribute;
16 pub fn test_layout<'a, 'tcx>(tcx: TyCtxt<'a, 'tcx, 'tcx>) {
17 if tcx.features().rustc_attrs {
18 // if the `rustc_attrs` feature is not enabled, don't bother testing layout
21 .visit_all_item_likes(&mut VarianceTest { tcx });
25 struct VarianceTest<'a, 'tcx: 'a> {
26 tcx: TyCtxt<'a, 'tcx, 'tcx>,
29 impl<'a, 'tcx> ItemLikeVisitor<'tcx> for VarianceTest<'a, 'tcx> {
30 fn visit_item(&mut self, item: &'tcx hir::Item) {
31 let item_def_id = self.tcx.hir().local_def_id_from_hir_id(item.hir_id);
33 if let ItemKind::Ty(..) = item.node {
34 for attr in self.tcx.get_attrs(item_def_id).iter() {
35 if attr.check_name("rustc_layout") {
36 self.dump_layout_of(item_def_id, item, attr);
42 fn visit_trait_item(&mut self, _: &'tcx hir::TraitItem) {}
43 fn visit_impl_item(&mut self, _: &'tcx hir::ImplItem) {}
46 impl<'a, 'tcx> VarianceTest<'a, 'tcx> {
47 fn dump_layout_of(&self, item_def_id: DefId, item: &hir::Item, attr: &Attribute) {
49 let param_env = self.tcx.param_env(item_def_id);
50 let ty = self.tcx.type_of(item_def_id);
51 match self.tcx.layout_of(param_env.and(ty)) {
53 // Check out the `#[rustc_layout(..)]` attribute to tell what to dump.
54 // The `..` are the names of fields to dump.
55 let meta_items = attr.meta_item_list().unwrap_or_default();
56 for meta_item in meta_items {
57 match meta_item.name_or_empty().get() {
61 .span_err(item.span, &format!("abi: {:?}", ty_layout.abi));
67 .span_err(item.span, &format!("align: {:?}", ty_layout.align));
73 .span_err(item.span, &format!("size: {:?}", ty_layout.size));
76 "homogeneous_aggregate" => {
77 self.tcx.sess.span_err(
80 "homogeneous_aggregate: {:?}",
82 .homogeneous_aggregate(&UnwrapLayoutCx { tcx, param_env }),
88 self.tcx.sess.span_err(
90 &format!("unrecognized field name `{}`", name),
97 Err(layout_error) => {
100 .span_err(item.span, &format!("layout error: {:?}", layout_error));
106 struct UnwrapLayoutCx<'me, 'tcx> {
107 tcx: TyCtxt<'me, 'tcx, 'tcx>,
108 param_env: ParamEnv<'tcx>,
111 impl<'me, 'tcx> LayoutOf for UnwrapLayoutCx<'me, 'tcx> {
113 type TyLayout = TyLayout<'tcx>;
115 fn layout_of(&self, ty: Ty<'tcx>) -> Self::TyLayout {
116 self.tcx.layout_of(self.param_env.and(ty)).unwrap()
120 impl<'me, 'tcx> HasTyCtxt<'tcx> for UnwrapLayoutCx<'me, 'tcx> {
121 fn tcx<'a>(&'a self) -> TyCtxt<'a, 'tcx, 'tcx> {
126 impl<'me, 'tcx> HasParamEnv<'tcx> for UnwrapLayoutCx<'me, 'tcx> {
127 fn param_env(&self) -> ParamEnv<'tcx> {
132 impl<'me, 'tcx> HasDataLayout for UnwrapLayoutCx<'me, 'tcx> {
133 fn data_layout(&self) -> &TargetDataLayout {
134 self.tcx.data_layout()