//! ["Queries: demand-driven compilation"](https://rustc-dev-guide.rust-lang.org/query.html).
//! This chapter includes instructions for adding new queries.
+use crate::ty::{self, print::describe_as_module, TyCtxt};
+use rustc_span::def_id::LOCAL_CRATE;
+
// Each of these queries corresponds to a function pointer field in the
// `Providers` struct for requesting a value of that type, and a method
// on `tcx: TyCtxt` (and `tcx.at(span)`) for doing that request in a way
separate_provide_extern
}
+ /// Checks whether a type is representable or infinitely sized
+ query representability(_: LocalDefId) -> rustc_middle::ty::Representability {
+ desc { "checking if {:?} is representable", tcx.def_path_str(key.to_def_id()) }
+ // infinitely sized types will cause a cycle
+ cycle_delay_bug
+ // we don't want recursive representability calls to be forced with
+ // incremental compilation because, if a cycle occurs, we need the
+ // entire cycle to be in memory for diagnostics
+ anon
+ }
+
+ /// An implementation detail for the `representability` query
+ query representability_adt_ty(_: Ty<'tcx>) -> rustc_middle::ty::Representability {
+ desc { "checking if {:?} is representable", key }
+ cycle_delay_bug
+ anon
+ }
+
+ /// Set of param indexes for type params that are in the type's representation
+ query params_in_repr(key: DefId) -> rustc_index::bit_set::BitSet<u32> {
+ desc { "finding type parameters in the representation" }
+ arena_cache
+ no_hash
+ separate_provide_extern
+ }
+
/// Fetch the THIR for a given body. If typeck for that body failed, returns an empty `Thir`.
query thir_body(key: ty::WithOptConstParam<LocalDefId>)
-> Result<(&'tcx Steal<thir::Thir<'tcx>>, thir::ExprId), ErrorGuaranteed>
separate_provide_extern
}
- // The cycle error here should be reported as an error by `check_representable`.
- // We consider the type as Sized in the meanwhile to avoid
- // further errors (done in impl Value for AdtSizedConstraint).
- // Use `cycle_delay_bug` to delay the cycle error here to be emitted later
- // in case we accidentally otherwise don't emit an error.
- query adt_sized_constraint(
- key: DefId
- ) -> AdtSizedConstraint<'tcx> {
+ query adt_sized_constraint(key: DefId) -> &'tcx [Ty<'tcx>] {
desc { |tcx| "computing `Sized` constraints for `{}`", tcx.def_path_str(key) }
- cycle_delay_bug
}
query adt_dtorck_constraint(
desc { |tcx| "finding all vtable entries for trait {}", tcx.def_path_str(key.def_id()) }
}
- query vtable_trait_upcasting_coercion_new_vptr_slot(key: (ty::Ty<'tcx>, ty::Ty<'tcx>)) -> Option<usize> {
+ query vtable_trait_upcasting_coercion_new_vptr_slot(key: (Ty<'tcx>, Ty<'tcx>)) -> Option<usize> {
desc { |tcx| "finding the slot within vtable for trait object {} vtable ptr during trait upcasting coercion from {} vtable",
key.1, key.0 }
}