4856affd90
- Add a `HandleCycleError` enum to rustc_query_system, along with a `handle_cycle_error` function - Move `Value` to rustc_query_system, so `handle_cycle_error` can use it - Move the `Value` impls from rustc_query_impl to rustc_middle. This is necessary due to orphan rules.
55 lines
2.1 KiB
Rust
55 lines
2.1 KiB
Rust
use rustc_middle::ty::{self, AdtSizedConstraint, Ty, TyCtxt};
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use rustc_query_system::Value;
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impl<'tcx> Value<TyCtxt<'tcx>> for Ty<'_> {
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fn from_cycle_error(tcx: TyCtxt<'tcx>) -> Self {
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// SAFETY: This is never called when `Self` is not `Ty<'tcx>`.
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// FIXME: Represent the above fact in the trait system somehow.
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unsafe { std::mem::transmute::<Ty<'tcx>, Ty<'_>>(tcx.ty_error()) }
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}
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}
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impl<'tcx> Value<TyCtxt<'tcx>> for ty::SymbolName<'_> {
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fn from_cycle_error(tcx: TyCtxt<'tcx>) -> Self {
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// SAFETY: This is never called when `Self` is not `SymbolName<'tcx>`.
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// FIXME: Represent the above fact in the trait system somehow.
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unsafe {
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std::mem::transmute::<ty::SymbolName<'tcx>, ty::SymbolName<'_>>(ty::SymbolName::new(
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tcx, "<error>",
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))
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}
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}
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}
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impl<'tcx> Value<TyCtxt<'tcx>> for AdtSizedConstraint<'_> {
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fn from_cycle_error(tcx: TyCtxt<'tcx>) -> Self {
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// SAFETY: This is never called when `Self` is not `AdtSizedConstraint<'tcx>`.
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// FIXME: Represent the above fact in the trait system somehow.
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unsafe {
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std::mem::transmute::<AdtSizedConstraint<'tcx>, AdtSizedConstraint<'_>>(
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AdtSizedConstraint(tcx.intern_type_list(&[tcx.ty_error()])),
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)
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}
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}
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}
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impl<'tcx> Value<TyCtxt<'tcx>> for ty::Binder<'_, ty::FnSig<'_>> {
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fn from_cycle_error(tcx: TyCtxt<'tcx>) -> Self {
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let err = tcx.ty_error();
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// FIXME(compiler-errors): It would be nice if we could get the
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// query key, so we could at least generate a fn signature that
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// has the right arity.
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let fn_sig = ty::Binder::dummy(tcx.mk_fn_sig(
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[].into_iter(),
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err,
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false,
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rustc_hir::Unsafety::Normal,
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rustc_target::spec::abi::Abi::Rust,
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));
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// SAFETY: This is never called when `Self` is not `ty::Binder<'tcx, ty::FnSig<'tcx>>`.
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// FIXME: Represent the above fact in the trait system somehow.
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unsafe { std::mem::transmute::<ty::PolyFnSig<'tcx>, ty::Binder<'_, ty::FnSig<'_>>>(fn_sig) }
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}
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}
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