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|
use rustc_ast::Attribute;
use rustc_hir::def::DefKind;
use rustc_hir::def_id::LocalDefId;
use rustc_middle::ty::layout::{HasParamEnv, HasTyCtxt, LayoutError, LayoutOfHelpers, TyAndLayout};
use rustc_middle::ty::{ParamEnv, Ty, TyCtxt};
use rustc_span::source_map::Spanned;
use rustc_span::symbol::sym;
use rustc_span::Span;
use rustc_target::abi::{HasDataLayout, TargetDataLayout};
use crate::errors::{Abi, Align, HomogeneousAggregate, LayoutOf, Size, UnrecognizedField};
pub fn test_layout(tcx: TyCtxt<'_>) {
if tcx.features().rustc_attrs {
// if the `rustc_attrs` feature is not enabled, don't bother testing layout
for id in tcx.hir().items() {
if matches!(
tcx.def_kind(id.owner_id),
DefKind::TyAlias | DefKind::Enum | DefKind::Struct | DefKind::Union
) {
for attr in tcx.get_attrs(id.owner_id, sym::rustc_layout) {
dump_layout_of(tcx, id.owner_id.def_id, attr);
}
}
}
}
}
fn dump_layout_of(tcx: TyCtxt<'_>, item_def_id: LocalDefId, attr: &Attribute) {
let tcx = tcx;
let param_env = tcx.param_env(item_def_id);
let ty = tcx.type_of(item_def_id).subst_identity();
match tcx.layout_of(param_env.and(ty)) {
Ok(ty_layout) => {
// Check out the `#[rustc_layout(..)]` attribute to tell what to dump.
// The `..` are the names of fields to dump.
let meta_items = attr.meta_item_list().unwrap_or_default();
for meta_item in meta_items {
match meta_item.name_or_empty() {
sym::abi => {
tcx.sess.emit_err(Abi {
span: tcx.def_span(item_def_id.to_def_id()),
abi: format!("{:?}", ty_layout.abi),
});
}
sym::align => {
tcx.sess.emit_err(Align {
span: tcx.def_span(item_def_id.to_def_id()),
align: format!("{:?}", ty_layout.align),
});
}
sym::size => {
tcx.sess.emit_err(Size {
span: tcx.def_span(item_def_id.to_def_id()),
size: format!("{:?}", ty_layout.size),
});
}
sym::homogeneous_aggregate => {
tcx.sess.emit_err(HomogeneousAggregate {
span: tcx.def_span(item_def_id.to_def_id()),
homogeneous_aggregate: format!(
"{:?}",
ty_layout.homogeneous_aggregate(&UnwrapLayoutCx { tcx, param_env })
),
});
}
sym::debug => {
let normalized_ty = format!(
"{:?}",
tcx.normalize_erasing_regions(
param_env.with_reveal_all_normalized(tcx),
ty,
)
);
let ty_layout = format!("{:#?}", *ty_layout);
tcx.sess.emit_err(LayoutOf {
span: tcx.def_span(item_def_id.to_def_id()),
normalized_ty,
ty_layout,
});
}
name => {
tcx.sess.emit_err(UnrecognizedField { span: meta_item.span(), name });
}
}
}
}
Err(layout_error) => {
tcx.sess.emit_fatal(Spanned {
node: layout_error,
span: tcx.def_span(item_def_id.to_def_id()),
});
}
}
}
struct UnwrapLayoutCx<'tcx> {
tcx: TyCtxt<'tcx>,
param_env: ParamEnv<'tcx>,
}
impl<'tcx> LayoutOfHelpers<'tcx> for UnwrapLayoutCx<'tcx> {
type LayoutOfResult = TyAndLayout<'tcx>;
fn handle_layout_err(&self, err: LayoutError<'tcx>, span: Span, ty: Ty<'tcx>) -> ! {
span_bug!(
span,
"`#[rustc_layout(..)]` test resulted in `layout_of({}) = Err({})`",
ty,
err
);
}
}
impl<'tcx> HasTyCtxt<'tcx> for UnwrapLayoutCx<'tcx> {
fn tcx(&self) -> TyCtxt<'tcx> {
self.tcx
}
}
impl<'tcx> HasParamEnv<'tcx> for UnwrapLayoutCx<'tcx> {
fn param_env(&self) -> ParamEnv<'tcx> {
self.param_env
}
}
impl<'tcx> HasDataLayout for UnwrapLayoutCx<'tcx> {
fn data_layout(&self) -> &TargetDataLayout {
self.tcx.data_layout()
}
}
|
