+++ /dev/null
-// This file contains various trait resolution methods used by codegen.
-// They all assume regions can be erased and monomorphic types. It
-// seems likely that they should eventually be merged into more
-// general routines.
-
-use crate::infer::{DefiningAnchor, TyCtxtInferExt};
-use crate::traits::error_reporting::TypeErrCtxtExt;
-use crate::traits::{
- ImplSource, Obligation, ObligationCause, SelectionContext, TraitEngine, TraitEngineExt,
- Unimplemented,
-};
-use rustc_infer::traits::FulfillmentErrorCode;
-use rustc_middle::traits::CodegenObligationError;
-use rustc_middle::ty::{self, TyCtxt};
-
-/// Attempts to resolve an obligation to an `ImplSource`. The result is
-/// a shallow `ImplSource` resolution, meaning that we do not
-/// (necessarily) resolve all nested obligations on the impl. Note
-/// that type check should guarantee to us that all nested
-/// obligations *could be* resolved if we wanted to.
-///
-/// This also expects that `trait_ref` is fully normalized.
-pub fn codegen_select_candidate<'tcx>(
- tcx: TyCtxt<'tcx>,
- (param_env, trait_ref): (ty::ParamEnv<'tcx>, ty::PolyTraitRef<'tcx>),
-) -> Result<&'tcx ImplSource<'tcx, ()>, CodegenObligationError> {
- // We expect the input to be fully normalized.
- debug_assert_eq!(trait_ref, tcx.normalize_erasing_regions(param_env, trait_ref));
-
- // Do the initial selection for the obligation. This yields the
- // shallow result we are looking for -- that is, what specific impl.
- let infcx = tcx
- .infer_ctxt()
- .ignoring_regions()
- .with_opaque_type_inference(DefiningAnchor::Bubble)
- .build();
- //~^ HACK `Bubble` is required for
- // this test to pass: type-alias-impl-trait/assoc-projection-ice.rs
- let mut selcx = SelectionContext::new(&infcx);
-
- let obligation_cause = ObligationCause::dummy();
- let obligation = Obligation::new(tcx, obligation_cause, param_env, trait_ref);
-
- let selection = match selcx.select(&obligation) {
- Ok(Some(selection)) => selection,
- Ok(None) => return Err(CodegenObligationError::Ambiguity),
- Err(Unimplemented) => return Err(CodegenObligationError::Unimplemented),
- Err(e) => {
- bug!("Encountered error `{:?}` selecting `{:?}` during codegen", e, trait_ref)
- }
- };
-
- debug!(?selection);
-
- // Currently, we use a fulfillment context to completely resolve
- // all nested obligations. This is because they can inform the
- // inference of the impl's type parameters.
- let mut fulfill_cx = <dyn TraitEngine<'tcx>>::new(tcx);
- let impl_source = selection.map(|predicate| {
- fulfill_cx.register_predicate_obligation(&infcx, predicate);
- });
-
- // In principle, we only need to do this so long as `impl_source`
- // contains unbound type parameters. It could be a slight
- // optimization to stop iterating early.
- let errors = fulfill_cx.select_all_or_error(&infcx);
- if !errors.is_empty() {
- // `rustc_monomorphize::collector` assumes there are no type errors.
- // Cycle errors are the only post-monomorphization errors possible; emit them now so
- // `rustc_ty_utils::resolve_associated_item` doesn't return `None` post-monomorphization.
- for err in errors {
- if let FulfillmentErrorCode::CodeCycle(cycle) = err.code {
- infcx.err_ctxt().report_overflow_obligation_cycle(&cycle);
- }
- }
- return Err(CodegenObligationError::FulfillmentError);
- }
-
- let impl_source = infcx.resolve_vars_if_possible(impl_source);
- let impl_source = infcx.tcx.erase_regions(impl_source);
-
- // Opaque types may have gotten their hidden types constrained, but we can ignore them safely
- // as they will get constrained elsewhere, too.
- // (ouz-a) This is required for `type-alias-impl-trait/assoc-projection-ice.rs` to pass
- let _ = infcx.inner.borrow_mut().opaque_type_storage.take_opaque_types();
-
- Ok(&*tcx.arena.alloc(impl_source))
-}
pub mod auto_trait;
mod chalk_fulfill;
-pub mod codegen;
mod coherence;
pub mod const_evaluatable;
mod engine;
*providers = ty::query::Providers {
specialization_graph_of: specialize::specialization_graph_provider,
specializes: specialize::specializes,
- codegen_select_candidate: codegen::codegen_select_candidate,
subst_and_check_impossible_predicates,
is_impossible_method,
..*providers
--- /dev/null
+// This file contains various trait resolution methods used by codegen.
+// They all assume regions can be erased and monomorphic types. It
+// seems likely that they should eventually be merged into more
+// general routines.
+
+use rustc_infer::infer::{DefiningAnchor, TyCtxtInferExt};
+use rustc_infer::traits::FulfillmentErrorCode;
+use rustc_middle::traits::CodegenObligationError;
+use rustc_middle::ty::{self, TyCtxt};
+use rustc_trait_selection::traits::error_reporting::TypeErrCtxtExt;
+use rustc_trait_selection::traits::{
+ ImplSource, Obligation, ObligationCause, SelectionContext, TraitEngine, TraitEngineExt,
+ Unimplemented,
+};
+
+/// Attempts to resolve an obligation to an `ImplSource`. The result is
+/// a shallow `ImplSource` resolution, meaning that we do not
+/// (necessarily) resolve all nested obligations on the impl. Note
+/// that type check should guarantee to us that all nested
+/// obligations *could be* resolved if we wanted to.
+///
+/// This also expects that `trait_ref` is fully normalized.
+pub fn codegen_select_candidate<'tcx>(
+ tcx: TyCtxt<'tcx>,
+ (param_env, trait_ref): (ty::ParamEnv<'tcx>, ty::PolyTraitRef<'tcx>),
+) -> Result<&'tcx ImplSource<'tcx, ()>, CodegenObligationError> {
+ // We expect the input to be fully normalized.
+ debug_assert_eq!(trait_ref, tcx.normalize_erasing_regions(param_env, trait_ref));
+
+ // Do the initial selection for the obligation. This yields the
+ // shallow result we are looking for -- that is, what specific impl.
+ let infcx = tcx
+ .infer_ctxt()
+ .ignoring_regions()
+ .with_opaque_type_inference(DefiningAnchor::Bubble)
+ .build();
+ //~^ HACK `Bubble` is required for
+ // this test to pass: type-alias-impl-trait/assoc-projection-ice.rs
+ let mut selcx = SelectionContext::new(&infcx);
+
+ let obligation_cause = ObligationCause::dummy();
+ let obligation = Obligation::new(tcx, obligation_cause, param_env, trait_ref);
+
+ let selection = match selcx.select(&obligation) {
+ Ok(Some(selection)) => selection,
+ Ok(None) => return Err(CodegenObligationError::Ambiguity),
+ Err(Unimplemented) => return Err(CodegenObligationError::Unimplemented),
+ Err(e) => {
+ bug!("Encountered error `{:?}` selecting `{:?}` during codegen", e, trait_ref)
+ }
+ };
+
+ debug!(?selection);
+
+ // Currently, we use a fulfillment context to completely resolve
+ // all nested obligations. This is because they can inform the
+ // inference of the impl's type parameters.
+ let mut fulfill_cx = <dyn TraitEngine<'tcx>>::new(tcx);
+ let impl_source = selection.map(|predicate| {
+ fulfill_cx.register_predicate_obligation(&infcx, predicate);
+ });
+
+ // In principle, we only need to do this so long as `impl_source`
+ // contains unbound type parameters. It could be a slight
+ // optimization to stop iterating early.
+ let errors = fulfill_cx.select_all_or_error(&infcx);
+ if !errors.is_empty() {
+ // `rustc_monomorphize::collector` assumes there are no type errors.
+ // Cycle errors are the only post-monomorphization errors possible; emit them now so
+ // `rustc_ty_utils::resolve_associated_item` doesn't return `None` post-monomorphization.
+ for err in errors {
+ if let FulfillmentErrorCode::CodeCycle(cycle) = err.code {
+ infcx.err_ctxt().report_overflow_obligation_cycle(&cycle);
+ }
+ }
+ return Err(CodegenObligationError::FulfillmentError);
+ }
+
+ let impl_source = infcx.resolve_vars_if_possible(impl_source);
+ let impl_source = infcx.tcx.erase_regions(impl_source);
+
+ // Opaque types may have gotten their hidden types constrained, but we can ignore them safely
+ // as they will get constrained elsewhere, too.
+ // (ouz-a) This is required for `type-alias-impl-trait/assoc-projection-ice.rs` to pass
+ let _ = infcx.inner.borrow_mut().opaque_type_storage.take_opaque_types();
+
+ Ok(&*tcx.arena.alloc(impl_source))
+}
mod normalize_erasing_regions;
mod normalize_projection_ty;
mod type_op;
+mod codegen;
pub use type_op::{type_op_ascribe_user_type_with_span, type_op_prove_predicate_with_cause};
normalize_projection_ty::provide(p);
normalize_erasing_regions::provide(p);
type_op::provide(p);
+ p.codegen_select_candidate = codegen::codegen_select_candidate;
}
projects / rust.git / commitdiff