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Diffstat (limited to '')
-rw-r--r-- | compiler/rustc_ty_utils/src/common_traits.rs | 51 |
1 files changed, 51 insertions, 0 deletions
diff --git a/compiler/rustc_ty_utils/src/common_traits.rs b/compiler/rustc_ty_utils/src/common_traits.rs new file mode 100644 index 000000000..cedc84d97 --- /dev/null +++ b/compiler/rustc_ty_utils/src/common_traits.rs @@ -0,0 +1,51 @@ +//! Queries for checking whether a type implements one of a few common traits. + +use rustc_hir::lang_items::LangItem; +use rustc_infer::infer::TyCtxtInferExt; +use rustc_middle::ty::{self, Ty, TyCtxt}; +use rustc_span::DUMMY_SP; +use rustc_trait_selection::traits; + +fn is_copy_raw<'tcx>(tcx: TyCtxt<'tcx>, query: ty::ParamEnvAnd<'tcx, Ty<'tcx>>) -> bool { + is_item_raw(tcx, query, LangItem::Copy) +} + +fn is_sized_raw<'tcx>(tcx: TyCtxt<'tcx>, query: ty::ParamEnvAnd<'tcx, Ty<'tcx>>) -> bool { + is_item_raw(tcx, query, LangItem::Sized) +} + +fn is_freeze_raw<'tcx>(tcx: TyCtxt<'tcx>, query: ty::ParamEnvAnd<'tcx, Ty<'tcx>>) -> bool { + is_item_raw(tcx, query, LangItem::Freeze) +} + +fn is_unpin_raw<'tcx>(tcx: TyCtxt<'tcx>, query: ty::ParamEnvAnd<'tcx, Ty<'tcx>>) -> bool { + is_item_raw(tcx, query, LangItem::Unpin) +} + +fn is_item_raw<'tcx>( + tcx: TyCtxt<'tcx>, + query: ty::ParamEnvAnd<'tcx, Ty<'tcx>>, + item: LangItem, +) -> bool { + let (param_env, ty) = query.into_parts(); + let trait_def_id = tcx.require_lang_item(item, None); + tcx.infer_ctxt().enter(|infcx| { + traits::type_known_to_meet_bound_modulo_regions( + &infcx, + param_env, + ty, + trait_def_id, + DUMMY_SP, + ) + }) +} + +pub(crate) fn provide(providers: &mut ty::query::Providers) { + *providers = ty::query::Providers { + is_copy_raw, + is_sized_raw, + is_freeze_raw, + is_unpin_raw, + ..*providers + }; +} |