a647ba250a
`#[cfg]`s are frequently used to gate crate content behind cargo features. This can lead to very confusing errors when features are missing. For example, `serde` doesn't have the `derive` feature by default. Therefore, `serde::Serialize` fails to resolve with a generic error, even though the macro is present in the docs. This commit adds a list of all stripped item names to metadata. This is filled during macro expansion and then, through a fed query, persisted in metadata. The downstream resolver can then access the metadata to look at possible candidates for mentioning in the errors. This slightly increases metadata (800k->809k for the feature-heavy windows crate), but not enough to really matter.
133 lines
3.8 KiB
Rust
133 lines
3.8 KiB
Rust
use rustc_data_structures::fx::FxHashMap;
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use rustc_hir::def_id::DefIndex;
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use rustc_index::{Idx, IndexVec};
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use crate::ty;
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pub trait ParameterizedOverTcx: 'static {
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type Value<'tcx>;
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}
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impl<T: ParameterizedOverTcx> ParameterizedOverTcx for &'static [T] {
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type Value<'tcx> = &'tcx [T::Value<'tcx>];
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}
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impl<T: ParameterizedOverTcx> ParameterizedOverTcx for Option<T> {
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type Value<'tcx> = Option<T::Value<'tcx>>;
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}
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impl<A: ParameterizedOverTcx, B: ParameterizedOverTcx> ParameterizedOverTcx for (A, B) {
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type Value<'tcx> = (A::Value<'tcx>, B::Value<'tcx>);
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}
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impl<I: Idx + 'static, T: ParameterizedOverTcx> ParameterizedOverTcx for IndexVec<I, T> {
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type Value<'tcx> = IndexVec<I, T::Value<'tcx>>;
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}
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impl<I: 'static, T: ParameterizedOverTcx> ParameterizedOverTcx for FxHashMap<I, T> {
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type Value<'tcx> = FxHashMap<I, T::Value<'tcx>>;
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}
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impl<T: ParameterizedOverTcx> ParameterizedOverTcx for ty::Binder<'static, T> {
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type Value<'tcx> = ty::Binder<'tcx, T::Value<'tcx>>;
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}
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impl<T: ParameterizedOverTcx> ParameterizedOverTcx for ty::EarlyBinder<T> {
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type Value<'tcx> = ty::EarlyBinder<T::Value<'tcx>>;
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}
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#[macro_export]
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macro_rules! trivially_parameterized_over_tcx {
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($($ty:ty),+ $(,)?) => {
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$(
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impl $crate::ty::ParameterizedOverTcx for $ty {
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#[allow(unused_lifetimes)]
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type Value<'tcx> = $ty;
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}
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)*
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}
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}
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trivially_parameterized_over_tcx! {
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usize,
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(),
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u32,
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bool,
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std::string::String,
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crate::metadata::ModChild,
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crate::middle::codegen_fn_attrs::CodegenFnAttrs,
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crate::middle::debugger_visualizer::DebuggerVisualizerFile,
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crate::middle::exported_symbols::SymbolExportInfo,
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crate::middle::resolve_bound_vars::ObjectLifetimeDefault,
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crate::mir::ConstQualifs,
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ty::AssocItemContainer,
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ty::DeducedParamAttrs,
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ty::Generics,
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ty::ImplPolarity,
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ty::ImplTraitInTraitData,
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ty::ReprOptions,
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ty::TraitDef,
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ty::UnusedGenericParams,
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ty::Visibility<DefIndex>,
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ty::adjustment::CoerceUnsizedInfo,
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ty::fast_reject::SimplifiedType,
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rustc_ast::Attribute,
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rustc_ast::DelimArgs,
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rustc_ast::expand::StrippedCfgItem<rustc_hir::def_id::DefIndex>,
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rustc_attr::ConstStability,
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rustc_attr::DefaultBodyStability,
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rustc_attr::Deprecation,
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rustc_attr::Stability,
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rustc_hir::Constness,
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rustc_hir::Defaultness,
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rustc_hir::GeneratorKind,
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rustc_hir::IsAsync,
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rustc_hir::LangItem,
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rustc_hir::def::DefKind,
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rustc_hir::def::DocLinkResMap,
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rustc_hir::def_id::DefId,
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rustc_hir::def_id::DefIndex,
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rustc_hir::definitions::DefKey,
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rustc_index::bit_set::BitSet<u32>,
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rustc_index::bit_set::FiniteBitSet<u32>,
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rustc_session::cstore::ForeignModule,
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rustc_session::cstore::LinkagePreference,
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rustc_session::cstore::NativeLib,
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rustc_span::ExpnData,
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rustc_span::ExpnHash,
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rustc_span::ExpnId,
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rustc_span::SourceFile,
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rustc_span::Span,
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rustc_span::Symbol,
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rustc_span::def_id::DefPathHash,
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rustc_span::hygiene::SyntaxContextData,
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rustc_span::symbol::Ident,
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rustc_type_ir::Variance,
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}
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// HACK(compiler-errors): This macro rule can only take a fake path,
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// not a real, due to parsing ambiguity reasons.
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#[macro_export]
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macro_rules! parameterized_over_tcx {
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($($($fake_path:ident)::+),+ $(,)?) => {
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$(
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impl $crate::ty::ParameterizedOverTcx for $($fake_path)::+<'static> {
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type Value<'tcx> = $($fake_path)::+<'tcx>;
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}
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)*
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}
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}
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parameterized_over_tcx! {
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crate::middle::exported_symbols::ExportedSymbol,
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crate::mir::Body,
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crate::mir::GeneratorLayout,
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ty::Ty,
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ty::FnSig,
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ty::GenericPredicates,
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ty::TraitRef,
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ty::Const,
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ty::Predicate,
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ty::Clause,
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ty::GeneratorDiagnosticData,
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}
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