147 lines
5.0 KiB
Rust
147 lines
5.0 KiB
Rust
use rustc_ast::Attribute;
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use rustc_hir as hir;
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use rustc_hir::def_id::LocalDefId;
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use rustc_hir::itemlikevisit::ItemLikeVisitor;
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use rustc_hir::ItemKind;
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use rustc_middle::ty::layout::{HasParamEnv, HasTyCtxt, LayoutError, LayoutOfHelpers, TyAndLayout};
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use rustc_middle::ty::{ParamEnv, Ty, TyCtxt};
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use rustc_span::symbol::sym;
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use rustc_span::Span;
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use rustc_target::abi::{HasDataLayout, TargetDataLayout};
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pub fn test_layout(tcx: TyCtxt<'_>) {
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if tcx.features().rustc_attrs {
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// if the `rustc_attrs` feature is not enabled, don't bother testing layout
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tcx.hir().visit_all_item_likes(&mut LayoutTest { tcx });
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}
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}
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struct LayoutTest<'tcx> {
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tcx: TyCtxt<'tcx>,
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}
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impl<'tcx> ItemLikeVisitor<'tcx> for LayoutTest<'tcx> {
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fn visit_item(&mut self, item: &'tcx hir::Item<'tcx>) {
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match item.kind {
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ItemKind::TyAlias(..)
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| ItemKind::Enum(..)
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| ItemKind::Struct(..)
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| ItemKind::Union(..) => {
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for attr in self.tcx.get_attrs(item.def_id.to_def_id()).iter() {
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if attr.has_name(sym::rustc_layout) {
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self.dump_layout_of(item.def_id, item, attr);
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}
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}
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}
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_ => {}
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}
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}
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fn visit_trait_item(&mut self, _: &'tcx hir::TraitItem<'tcx>) {}
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fn visit_impl_item(&mut self, _: &'tcx hir::ImplItem<'tcx>) {}
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fn visit_foreign_item(&mut self, _: &'tcx hir::ForeignItem<'tcx>) {}
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}
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impl<'tcx> LayoutTest<'tcx> {
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fn dump_layout_of(&self, item_def_id: LocalDefId, item: &hir::Item<'tcx>, attr: &Attribute) {
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let tcx = self.tcx;
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let param_env = self.tcx.param_env(item_def_id);
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let ty = self.tcx.type_of(item_def_id);
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match self.tcx.layout_of(param_env.and(ty)) {
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Ok(ty_layout) => {
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// Check out the `#[rustc_layout(..)]` attribute to tell what to dump.
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// The `..` are the names of fields to dump.
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let meta_items = attr.meta_item_list().unwrap_or_default();
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for meta_item in meta_items {
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match meta_item.name_or_empty() {
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sym::abi => {
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self.tcx.sess.span_err(item.span, &format!("abi: {:?}", ty_layout.abi));
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}
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sym::align => {
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self.tcx
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.sess
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.span_err(item.span, &format!("align: {:?}", ty_layout.align));
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}
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sym::size => {
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self.tcx
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.sess
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.span_err(item.span, &format!("size: {:?}", ty_layout.size));
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}
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sym::homogeneous_aggregate => {
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self.tcx.sess.span_err(
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item.span,
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&format!(
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"homogeneous_aggregate: {:?}",
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ty_layout
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.homogeneous_aggregate(&UnwrapLayoutCx { tcx, param_env }),
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),
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);
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}
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sym::debug => {
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let normalized_ty = self.tcx.normalize_erasing_regions(
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param_env.with_reveal_all_normalized(self.tcx),
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ty,
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);
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self.tcx.sess.span_err(
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item.span,
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&format!("layout_of({:?}) = {:#?}", normalized_ty, *ty_layout),
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);
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}
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name => {
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self.tcx.sess.span_err(
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meta_item.span(),
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&format!("unrecognized field name `{}`", name),
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);
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}
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}
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}
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}
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Err(layout_error) => {
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self.tcx.sess.span_err(item.span, &format!("layout error: {:?}", layout_error));
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}
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}
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}
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}
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struct UnwrapLayoutCx<'tcx> {
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tcx: TyCtxt<'tcx>,
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param_env: ParamEnv<'tcx>,
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}
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impl<'tcx> LayoutOfHelpers<'tcx> for UnwrapLayoutCx<'tcx> {
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type LayoutOfResult = TyAndLayout<'tcx>;
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fn handle_layout_err(&self, err: LayoutError<'tcx>, span: Span, ty: Ty<'tcx>) -> ! {
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span_bug!(
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span,
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"`#[rustc_layout(..)]` test resulted in `layout_of({}) = Err({})`",
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ty,
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err
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);
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}
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}
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impl<'tcx> HasTyCtxt<'tcx> for UnwrapLayoutCx<'tcx> {
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fn tcx(&self) -> TyCtxt<'tcx> {
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self.tcx
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}
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}
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impl<'tcx> HasParamEnv<'tcx> for UnwrapLayoutCx<'tcx> {
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fn param_env(&self) -> ParamEnv<'tcx> {
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self.param_env
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}
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}
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impl<'tcx> HasDataLayout for UnwrapLayoutCx<'tcx> {
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fn data_layout(&self) -> &TargetDataLayout {
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self.tcx.data_layout()
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}
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}
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