compiler/rustc_middle/src/ty/parameterized.rs

   1 use rustc_data_structures::fx::FxHashMap;
   2 use rustc_hir::def_id::DefIndex;
   3 use rustc_index::vec::{Idx, IndexVec};
   4
   5 use crate::ty;
   6
   7 pub trait ParameterizedOverTcx: 'static {
   8     type Value<'tcx>;
   9 }
  10
  11 impl<T: ParameterizedOverTcx> ParameterizedOverTcx for &'static [T] {
  12     type Value<'tcx> = &'tcx [T::Value<'tcx>];
  13 }
  14
  15 impl<T: ParameterizedOverTcx> ParameterizedOverTcx for Option<T> {
  16     type Value<'tcx> = Option<T::Value<'tcx>>;
  17 }
  18
  19 impl<A: ParameterizedOverTcx, B: ParameterizedOverTcx> ParameterizedOverTcx for (A, B) {
  20     type Value<'tcx> = (A::Value<'tcx>, B::Value<'tcx>);
  21 }
  22
  23 impl<I: Idx + 'static, T: ParameterizedOverTcx> ParameterizedOverTcx for IndexVec<I, T> {
  24     type Value<'tcx> = IndexVec<I, T::Value<'tcx>>;
  25 }
  26
  27 impl<I: 'static, T: ParameterizedOverTcx> ParameterizedOverTcx for FxHashMap<I, T> {
  28     type Value<'tcx> = FxHashMap<I, T::Value<'tcx>>;
  29 }
  30
  31 impl<T: ParameterizedOverTcx> ParameterizedOverTcx for ty::Binder<'static, T> {
  32     type Value<'tcx> = ty::Binder<'tcx, T::Value<'tcx>>;
  33 }
  34
  35 #[macro_export]
  36 macro_rules! trivially_parameterized_over_tcx {
  37     ($($ty:ty),+ $(,)?) => {
  38         $(
  39             impl $crate::ty::ParameterizedOverTcx for $ty {
  40                 #[allow(unused_lifetimes)]
  41                 type Value<'tcx> = $ty;
  42             }
  43         )*
  44     }
  45 }
  46
  47 trivially_parameterized_over_tcx! {
  48     usize,
  49     (),
  50     u32,
  51     std::string::String,
  52     crate::metadata::ModChild,
  53     crate::middle::codegen_fn_attrs::CodegenFnAttrs,
  54     crate::middle::exported_symbols::SymbolExportInfo,
  55     crate::middle::resolve_lifetime::ObjectLifetimeDefault,
  56     crate::mir::ConstQualifs,
  57     ty::AssocItemContainer,
  58     ty::DeducedParamAttrs,
  59     ty::Generics,
  60     ty::ImplPolarity,
  61     ty::ReprOptions,
  62     ty::TraitDef,
  63     ty::Visibility<DefIndex>,
  64     ty::adjustment::CoerceUnsizedInfo,
  65     ty::fast_reject::SimplifiedType,
  66     rustc_ast::Attribute,
  67     rustc_ast::DelimArgs,
  68     rustc_attr::ConstStability,
  69     rustc_attr::DefaultBodyStability,
  70     rustc_attr::Deprecation,
  71     rustc_attr::Stability,
  72     rustc_hir::Constness,
  73     rustc_hir::Defaultness,
  74     rustc_hir::GeneratorKind,
  75     rustc_hir::IsAsync,
  76     rustc_hir::LangItem,
  77     rustc_hir::def::DefKind,
  78     rustc_hir::def_id::DefIndex,
  79     rustc_hir::definitions::DefKey,
  80     rustc_index::bit_set::BitSet<u32>,
  81     rustc_index::bit_set::FiniteBitSet<u32>,
  82     rustc_session::cstore::ForeignModule,
  83     rustc_session::cstore::LinkagePreference,
  84     rustc_session::cstore::NativeLib,
  85     rustc_span::DebuggerVisualizerFile,
  86     rustc_span::ExpnData,
  87     rustc_span::ExpnHash,
  88     rustc_span::ExpnId,
  89     rustc_span::SourceFile,
  90     rustc_span::Span,
  91     rustc_span::Symbol,
  92     rustc_span::def_id::DefPathHash,
  93     rustc_span::hygiene::SyntaxContextData,
  94     rustc_span::symbol::Ident,
  95     rustc_type_ir::Variance,
  96 }
  97
  98 // HACK(compiler-errors): This macro rule can only take a fake path,
  99 // not a real, due to parsing ambiguity reasons.
 100 #[macro_export]
 101 macro_rules! parameterized_over_tcx {
 102     ($($($fake_path:ident)::+),+ $(,)?) => {
 103         $(
 104             impl $crate::ty::ParameterizedOverTcx for $($fake_path)::+<'static> {
 105                 type Value<'tcx> = $($fake_path)::+<'tcx>;
 106             }
 107         )*
 108     }
 109 }
 110
 111 parameterized_over_tcx! {
 112     crate::middle::exported_symbols::ExportedSymbol,
 113     crate::mir::Body,
 114     ty::Ty,
 115     ty::FnSig,
 116     ty::GenericPredicates,
 117     ty::TraitRef,
 118     ty::Const,
 119     ty::Predicate,
 120     ty::Clause,
 121     ty::GeneratorDiagnosticData,
 122 }