diff options
11 files changed, 155 insertions, 121 deletions
diff --git a/compiler/rustc_middle/src/traits/solve.rs b/compiler/rustc_middle/src/traits/solve.rs index 9d63d291854..27a1e64a78b 100644 --- a/compiler/rustc_middle/src/traits/solve.rs +++ b/compiler/rustc_middle/src/traits/solve.rs @@ -9,6 +9,9 @@ use crate::ty::{ self, FallibleTypeFolder, ToPredicate, Ty, TyCtxt, TypeFoldable, TypeFolder, TypeVisitable, TypeVisitor, }; +use rustc_span::def_id::DefId; + +use super::BuiltinImplSource; mod cache; pub mod inspect; @@ -235,3 +238,63 @@ pub enum IsNormalizesToHack { Yes, No, } + +/// Possible ways the given goal can be proven. +#[derive(Debug, Clone, Copy, PartialEq, Eq)] +pub enum CandidateSource { + /// A user written impl. + /// + /// ## Examples + /// + /// ```rust + /// fn main() { + /// let x: Vec<u32> = Vec::new(); + /// // This uses the impl from the standard library to prove `Vec<T>: Clone`. + /// let y = x.clone(); + /// } + /// ``` + Impl(DefId), + /// A builtin impl generated by the compiler. When adding a new special + /// trait, try to use actual impls whenever possible. Builtin impls should + /// only be used in cases where the impl cannot be manually be written. + /// + /// Notable examples are auto traits, `Sized`, and `DiscriminantKind`. + /// For a list of all traits with builtin impls, check out the + /// `EvalCtxt::assemble_builtin_impl_candidates` method. + BuiltinImpl(BuiltinImplSource), + /// An assumption from the environment. + /// + /// More precisely we've used the `n-th` assumption in the `param_env`. + /// + /// ## Examples + /// + /// ```rust + /// fn is_clone<T: Clone>(x: T) -> (T, T) { + /// // This uses the assumption `T: Clone` from the `where`-bounds + /// // to prove `T: Clone`. + /// (x.clone(), x) + /// } + /// ``` + ParamEnv(usize), + /// If the self type is an alias type, e.g. an opaque type or a projection, + /// we know the bounds on that alias to hold even without knowing its concrete + /// underlying type. + /// + /// More precisely this candidate is using the `n-th` bound in the `item_bounds` of + /// the self type. + /// + /// ## Examples + /// + /// ```rust + /// trait Trait { + /// type Assoc: Clone; + /// } + /// + /// fn foo<T: Trait>(x: <T as Trait>::Assoc) { + /// // We prove `<T as Trait>::Assoc` by looking at the bounds on `Assoc` in + /// // in the trait definition. + /// let _y = x.clone(); + /// } + /// ``` + AliasBound, +} diff --git a/compiler/rustc_middle/src/traits/solve/inspect.rs b/compiler/rustc_middle/src/traits/solve/inspect.rs index dc51ded1b80..a2dfde2f0d4 100644 --- a/compiler/rustc_middle/src/traits/solve/inspect.rs +++ b/compiler/rustc_middle/src/traits/solve/inspect.rs @@ -1,5 +1,6 @@ use super::{ - CanonicalInput, Certainty, Goal, IsNormalizesToHack, NoSolution, QueryInput, QueryResult, + CandidateSource, CanonicalInput, Certainty, Goal, IsNormalizesToHack, NoSolution, QueryInput, + QueryResult, }; use crate::ty; use format::ProofTreeFormatter; @@ -7,13 +8,13 @@ use std::fmt::{Debug, Write}; mod format; -#[derive(Eq, PartialEq, Debug, Hash, HashStable)] +#[derive(Debug, Eq, PartialEq)] pub enum CacheHit { Provisional, Global, } -#[derive(Eq, PartialEq, Hash, HashStable)] +#[derive(Eq, PartialEq)] pub struct GoalEvaluation<'tcx> { pub uncanonicalized_goal: Goal<'tcx, ty::Predicate<'tcx>>, pub is_normalizes_to_hack: IsNormalizesToHack, @@ -21,14 +22,14 @@ pub struct GoalEvaluation<'tcx> { pub returned_goals: Vec<Goal<'tcx, ty::Predicate<'tcx>>>, } -#[derive(Eq, PartialEq, Hash, HashStable)] +#[derive(Eq, PartialEq)] pub struct CanonicalGoalEvaluation<'tcx> { pub goal: CanonicalInput<'tcx>, pub kind: GoalEvaluationKind<'tcx>, pub result: QueryResult<'tcx>, } -#[derive(Eq, PartialEq, Hash, HashStable)] +#[derive(Eq, PartialEq)] pub enum GoalEvaluationKind<'tcx> { CacheHit(CacheHit), Uncached { revisions: Vec<GoalEvaluationStep<'tcx>> }, @@ -39,13 +40,13 @@ impl Debug for GoalEvaluation<'_> { } } -#[derive(Eq, PartialEq, Hash, HashStable)] +#[derive(Eq, PartialEq)] pub struct AddedGoalsEvaluation<'tcx> { pub evaluations: Vec<Vec<GoalEvaluation<'tcx>>>, pub result: Result<Certainty, NoSolution>, } -#[derive(Eq, PartialEq, Hash, HashStable)] +#[derive(Eq, PartialEq)] pub struct GoalEvaluationStep<'tcx> { pub instantiated_goal: QueryInput<'tcx, ty::Predicate<'tcx>>, @@ -55,24 +56,28 @@ pub struct GoalEvaluationStep<'tcx> { pub result: QueryResult<'tcx>, } -#[derive(Eq, PartialEq, Hash, HashStable)] +#[derive(Eq, PartialEq)] pub struct GoalCandidate<'tcx> { pub added_goals_evaluations: Vec<AddedGoalsEvaluation<'tcx>>, pub candidates: Vec<GoalCandidate<'tcx>>, - pub kind: CandidateKind<'tcx>, + pub kind: ProbeKind<'tcx>, } -#[derive(Eq, PartialEq, Debug, Hash, HashStable)] -pub enum CandidateKind<'tcx> { +#[derive(Debug, PartialEq, Eq)] +pub enum ProbeKind<'tcx> { /// Probe entered when normalizing the self ty during candidate assembly NormalizedSelfTyAssembly, - /// A normal candidate for proving a goal - Candidate { name: String, result: QueryResult<'tcx> }, + /// Some candidate to prove the current goal. + /// + /// FIXME: Remove this in favor of always using more strongly typed variants. + MiscCandidate { name: &'static str, result: QueryResult<'tcx> }, + /// A candidate for proving a trait or alias-relate goal. + TraitCandidate { source: CandidateSource, result: QueryResult<'tcx> }, /// Used in the probe that wraps normalizing the non-self type for the unsize /// trait, which is also structurally matched on. UnsizeAssembly, /// During upcasting from some source object to target object type, used to /// do a probe to find out what projection type(s) may be used to prove that /// the source type upholds all of the target type's object bounds. - UpcastProbe, + UpcastProjectionCompatibility, } diff --git a/compiler/rustc_middle/src/traits/solve/inspect/format.rs b/compiler/rustc_middle/src/traits/solve/inspect/format.rs index 487d0fe6bbd..7c077beeed6 100644 --- a/compiler/rustc_middle/src/traits/solve/inspect/format.rs +++ b/compiler/rustc_middle/src/traits/solve/inspect/format.rs @@ -102,18 +102,21 @@ impl<'a, 'b> ProofTreeFormatter<'a, 'b> { pub(super) fn format_candidate(&mut self, candidate: &GoalCandidate<'_>) -> std::fmt::Result { match &candidate.kind { - CandidateKind::NormalizedSelfTyAssembly => { + ProbeKind::NormalizedSelfTyAssembly => { writeln!(self.f, "NORMALIZING SELF TY FOR ASSEMBLY:") } - CandidateKind::UnsizeAssembly => { + ProbeKind::UnsizeAssembly => { writeln!(self.f, "ASSEMBLING CANDIDATES FOR UNSIZING:") } - CandidateKind::UpcastProbe => { + ProbeKind::UpcastProjectionCompatibility => { writeln!(self.f, "PROBING FOR PROJECTION COMPATIBILITY FOR UPCASTING:") } - CandidateKind::Candidate { name, result } => { + ProbeKind::MiscCandidate { name, result } => { writeln!(self.f, "CANDIDATE {name}: {result:?}") } + ProbeKind::TraitCandidate { source, result } => { + writeln!(self.f, "CANDIDATE {source:?}: {result:?}") + } }?; self.nested(|this| { diff --git a/compiler/rustc_trait_selection/src/solve/alias_relate.rs b/compiler/rustc_trait_selection/src/solve/alias_relate.rs index 6b839d64b87..f7031c5f493 100644 --- a/compiler/rustc_trait_selection/src/solve/alias_relate.rs +++ b/compiler/rustc_trait_selection/src/solve/alias_relate.rs @@ -125,7 +125,7 @@ impl<'tcx> EvalCtxt<'_, 'tcx> { direction: ty::AliasRelationDirection, invert: Invert, ) -> QueryResult<'tcx> { - self.probe_candidate("normalizes-to").enter(|ecx| { + self.probe_misc_candidate("normalizes-to").enter(|ecx| { ecx.normalizes_to_inner(param_env, alias, other, direction, invert)?; ecx.evaluate_added_goals_and_make_canonical_response(Certainty::Yes) }) @@ -175,7 +175,7 @@ impl<'tcx> EvalCtxt<'_, 'tcx> { alias_rhs: ty::AliasTy<'tcx>, direction: ty::AliasRelationDirection, ) -> QueryResult<'tcx> { - self.probe_candidate("args relate").enter(|ecx| { + self.probe_misc_candidate("args relate").enter(|ecx| { match direction { ty::AliasRelationDirection::Equate => { ecx.eq(param_env, alias_lhs, alias_rhs)?; @@ -196,7 +196,7 @@ impl<'tcx> EvalCtxt<'_, 'tcx> { rhs: ty::Term<'tcx>, direction: ty::AliasRelationDirection, ) -> QueryResult<'tcx> { - self.probe_candidate("bidir normalizes-to").enter(|ecx| { + self.probe_misc_candidate("bidir normalizes-to").enter(|ecx| { ecx.normalizes_to_inner( param_env, lhs.to_alias_ty(ecx.tcx()).unwrap(), diff --git a/compiler/rustc_trait_selection/src/solve/assembly/mod.rs b/compiler/rustc_trait_selection/src/solve/assembly/mod.rs index 36194f973b5..128b9ad7e47 100644 --- a/compiler/rustc_trait_selection/src/solve/assembly/mod.rs +++ b/compiler/rustc_trait_selection/src/solve/assembly/mod.rs @@ -5,8 +5,10 @@ use crate::traits::coherence; use rustc_hir::def_id::DefId; use rustc_infer::traits::query::NoSolution; use rustc_infer::traits::Reveal; -use rustc_middle::traits::solve::inspect::CandidateKind; -use rustc_middle::traits::solve::{CanonicalResponse, Certainty, Goal, QueryResult}; +use rustc_middle::traits::solve::inspect::ProbeKind; +use rustc_middle::traits::solve::{ + CandidateSource, CanonicalResponse, Certainty, Goal, QueryResult, +}; use rustc_middle::traits::BuiltinImplSource; use rustc_middle::ty::fast_reject::{SimplifiedType, TreatParams}; use rustc_middle::ty::{self, Ty, TyCtxt}; @@ -27,66 +29,6 @@ pub(super) struct Candidate<'tcx> { pub(super) result: CanonicalResponse<'tcx>, } -/// Possible ways the given goal can be proven. -#[derive(Debug, Clone, Copy)] -pub(super) enum CandidateSource { - /// A user written impl. - /// - /// ## Examples - /// - /// ```rust - /// fn main() { - /// let x: Vec<u32> = Vec::new(); - /// // This uses the impl from the standard library to prove `Vec<T>: Clone`. - /// let y = x.clone(); - /// } - /// ``` - Impl(DefId), - /// A builtin impl generated by the compiler. When adding a new special - /// trait, try to use actual impls whenever possible. Builtin impls should - /// only be used in cases where the impl cannot be manually be written. - /// - /// Notable examples are auto traits, `Sized`, and `DiscriminantKind`. - /// For a list of all traits with builtin impls, check out the - /// [`EvalCtxt::assemble_builtin_impl_candidates`] method. Not - BuiltinImpl(BuiltinImplSource), - /// An assumption from the environment. - /// - /// More precisely we've used the `n-th` assumption in the `param_env`. - /// - /// ## Examples - /// - /// ```rust - /// fn is_clone<T: Clone>(x: T) -> (T, T) { - /// // This uses the assumption `T: Clone` from the `where`-bounds - /// // to prove `T: Clone`. - /// (x.clone(), x) - /// } - /// ``` - ParamEnv(usize), - /// If the self type is an alias type, e.g. an opaque type or a projection, - /// we know the bounds on that alias to hold even without knowing its concrete - /// underlying type. - /// - /// More precisely this candidate is using the `n-th` bound in the `item_bounds` of - /// the self type. - /// - /// ## Examples - /// - /// ```rust - /// trait Trait { - /// type Assoc: Clone; - /// } - /// - /// fn foo<T: Trait>(x: <T as Trait>::Assoc) { - /// // We prove `<T as Trait>::Assoc` by looking at the bounds on `Assoc` in - /// // in the trait definition. - /// let _y = x.clone(); - /// } - /// ``` - AliasBound, -} - /// Methods used to assemble candidates for either trait or projection goals. pub(super) trait GoalKind<'tcx>: TypeFoldable<TyCtxt<'tcx>> + Copy + Eq + std::fmt::Display @@ -399,7 +341,7 @@ impl<'tcx> EvalCtxt<'_, 'tcx> { let tcx = self.tcx(); let &ty::Alias(_, projection_ty) = goal.predicate.self_ty().kind() else { return }; - candidates.extend(self.probe(|_| CandidateKind::NormalizedSelfTyAssembly).enter(|ecx| { + candidates.extend(self.probe(|_| ProbeKind::NormalizedSelfTyAssembly).enter(|ecx| { if num_steps < ecx.local_overflow_limit() { let normalized_ty = ecx.next_ty_infer(); let normalizes_to_goal = goal.with( @@ -910,7 +852,7 @@ impl<'tcx> EvalCtxt<'_, 'tcx> { SolverMode::Coherence => {} }; - let result = self.probe_candidate("coherence unknowable").enter(|ecx| { + let result = self.probe_misc_candidate("coherence unknowable").enter(|ecx| { let trait_ref = goal.predicate.trait_ref(tcx); #[derive(Debug)] diff --git a/compiler/rustc_trait_selection/src/solve/eval_ctxt.rs b/compiler/rustc_trait_selection/src/solve/eval_ctxt.rs index 2901baa017e..307c0516f70 100644 --- a/compiler/rustc_trait_selection/src/solve/eval_ctxt.rs +++ b/compiler/rustc_trait_selection/src/solve/eval_ctxt.rs @@ -920,7 +920,7 @@ impl<'tcx> EvalCtxt<'_, 'tcx> { if candidate_key.def_id != key.def_id { continue; } - values.extend(self.probe_candidate("opaque type storage").enter(|ecx| { + values.extend(self.probe_misc_candidate("opaque type storage").enter(|ecx| { for (a, b) in std::iter::zip(candidate_key.args, key.args) { ecx.eq(param_env, a, b)?; } diff --git a/compiler/rustc_trait_selection/src/solve/eval_ctxt/probe.rs b/compiler/rustc_trait_selection/src/solve/eval_ctxt/probe.rs index 317c43baf8f..f88cfbac3f3 100644 --- a/compiler/rustc_trait_selection/src/solve/eval_ctxt/probe.rs +++ b/compiler/rustc_trait_selection/src/solve/eval_ctxt/probe.rs @@ -1,5 +1,5 @@ use super::EvalCtxt; -use rustc_middle::traits::solve::{inspect, QueryResult}; +use rustc_middle::traits::solve::{inspect, CandidateSource, QueryResult}; use std::marker::PhantomData; pub(in crate::solve) struct ProbeCtxt<'me, 'a, 'tcx, F, T> { @@ -10,7 +10,7 @@ pub(in crate::solve) struct ProbeCtxt<'me, 'a, 'tcx, F, T> { impl<'tcx, F, T> ProbeCtxt<'_, '_, 'tcx, F, T> where - F: FnOnce(&T) -> inspect::CandidateKind<'tcx>, + F: FnOnce(&T) -> inspect::ProbeKind<'tcx>, { pub(in crate::solve) fn enter(self, f: impl FnOnce(&mut EvalCtxt<'_, 'tcx>) -> T) -> T { let ProbeCtxt { ecx: outer_ecx, probe_kind, _result } = self; @@ -28,8 +28,8 @@ where }; let r = nested_ecx.infcx.probe(|_| f(&mut nested_ecx)); if !outer_ecx.inspect.is_noop() { - let cand_kind = probe_kind(&r); - nested_ecx.inspect.candidate_kind(cand_kind); + let probe_kind = probe_kind(&r); + nested_ecx.inspect.probe_kind(probe_kind); outer_ecx.inspect.goal_candidate(nested_ecx.inspect); } r @@ -41,25 +41,45 @@ impl<'a, 'tcx> EvalCtxt<'a, 'tcx> { /// as expensive as necessary to output the desired information. pub(in crate::solve) fn probe<F, T>(&mut self, probe_kind: F) -> ProbeCtxt<'_, 'a, 'tcx, F, T> where - F: FnOnce(&T) -> inspect::CandidateKind<'tcx>, + F: FnOnce(&T) -> inspect::ProbeKind<'tcx>, { ProbeCtxt { ecx: self, probe_kind, _result: PhantomData } } - pub(in crate::solve) fn probe_candidate( + pub(in crate::solve) fn probe_misc_candidate( &mut self, name: &'static str, ) -> ProbeCtxt< '_, 'a, 'tcx, - impl FnOnce(&QueryResult<'tcx>) -> inspect::CandidateKind<'tcx>, + impl FnOnce(&QueryResult<'tcx>) -> inspect::ProbeKind<'tcx>, QueryResult<'tcx>, > { ProbeCtxt { ecx: self, - probe_kind: move |result: &QueryResult<'tcx>| inspect::CandidateKind::Candidate { - name: name.to_string(), + probe_kind: move |result: &QueryResult<'tcx>| inspect::ProbeKind::MiscCandidate { + name, + result: *result, + }, + _result: PhantomData, + } + } + + pub(in crate::solve) fn probe_trait_candidate( + &mut self, + source: CandidateSource, + ) -> ProbeCtxt< + '_, + 'a, + 'tcx, + impl FnOnce(&QueryResult<'tcx>) -> inspect::ProbeKind<'tcx>, + QueryResult<'tcx>, + > { + ProbeCtxt { + ecx: self, + probe_kind: move |result: &QueryResult<'tcx>| inspect::ProbeKind::TraitCandidate { + source, result: *result, }, _result: PhantomData, diff --git a/compiler/rustc_trait_selection/src/solve/eval_ctxt/select.rs b/compiler/rustc_trait_selection/src/solve/eval_ctxt/select.rs index 42d7a587cac..315df06be41 100644 --- a/compiler/rustc_trait_selection/src/solve/eval_ctxt/select.rs +++ b/compiler/rustc_trait_selection/src/solve/eval_ctxt/select.rs @@ -4,14 +4,14 @@ use rustc_infer::infer::{DefineOpaqueTypes, InferCtxt}; use rustc_infer::traits::{ Obligation, PolyTraitObligation, PredicateObligation, Selection, SelectionResult, TraitEngine, }; -use rustc_middle::traits::solve::{CanonicalInput, Certainty, Goal}; +use rustc_middle::traits::solve::{CandidateSource, CanonicalInput, Certainty, Goal}; use rustc_middle::traits::{ BuiltinImplSource, ImplSource, ImplSourceUserDefinedData, ObligationCause, SelectionError, }; use rustc_middle::ty::{self, Ty, TyCtxt}; use rustc_span::DUMMY_SP; -use crate::solve::assembly::{Candidate, CandidateSource}; +use crate::solve::assembly::Candidate; use crate::solve::eval_ctxt::{EvalCtxt, GenerateProofTree}; use crate::solve::inspect::ProofTreeBuilder; use crate::traits::StructurallyNormalizeExt; diff --git a/compiler/rustc_trait_selection/src/solve/inspect.rs b/compiler/rustc_trait_selection/src/solve/inspect.rs index b78abf0d544..f38edd8b9a0 100644 --- a/compiler/rustc_trait_selection/src/solve/inspect.rs +++ b/compiler/rustc_trait_selection/src/solve/inspect.rs @@ -1,5 +1,5 @@ use rustc_middle::traits::query::NoSolution; -use rustc_middle::traits::solve::inspect::{self, CacheHit, CandidateKind}; +use rustc_middle::traits::solve::inspect::{self, CacheHit, ProbeKind}; use rustc_middle::traits::solve::{ CanonicalInput, Certainty, Goal, IsNormalizesToHack, QueryInput, QueryResult, }; @@ -9,7 +9,7 @@ use rustc_session::config::DumpSolverProofTree; use super::eval_ctxt::UseGlobalCache; use super::GenerateProofTree; -#[derive(Eq, PartialEq, Debug, Hash, HashStable)] +#[derive(Eq, PartialEq, Debug)] pub struct WipGoalEvaluation<'tcx> { pub uncanonicalized_goal: Goal<'tcx, ty::Predicate<'tcx>>, pub evaluation: Option<WipCanonicalGoalEvaluation<'tcx>>, @@ -28,7 +28,7 @@ impl<'tcx> WipGoalEvaluation<'tcx> { } } -#[derive(Eq, PartialEq, Debug, Hash, HashStable)] +#[derive(Eq, PartialEq, Debug)] pub struct WipCanonicalGoalEvaluation<'tcx> { pub goal: CanonicalInput<'tcx>, pub cache_hit: Option<CacheHit>, @@ -56,7 +56,7 @@ impl<'tcx> WipCanonicalGoalEvaluation<'tcx> { } } -#[derive(Eq, PartialEq, Debug, Hash, HashStable)] +#[derive(Eq, PartialEq, Debug)] pub struct WipAddedGoalsEvaluation<'tcx> { pub evaluations: Vec<Vec<WipGoalEvaluation<'tcx>>>, pub result: Option<Result<Certainty, NoSolution>>, @@ -77,7 +77,7 @@ impl<'tcx> WipAddedGoalsEvaluation<'tcx> { } } -#[derive(Eq, PartialEq, Debug, Hash, HashStable)] +#[derive(Eq, PartialEq, Debug)] pub struct WipGoalEvaluationStep<'tcx> { pub instantiated_goal: QueryInput<'tcx, ty::Predicate<'tcx>>, @@ -102,11 +102,11 @@ impl<'tcx> WipGoalEvaluationStep<'tcx> { } } -#[derive(Eq, PartialEq, Debug, Hash, HashStable)] +#[derive(Eq, PartialEq, Debug)] pub struct WipGoalCandidate<'tcx> { pub added_goals_evaluations: Vec<WipAddedGoalsEvaluation<'tcx>>, pub candidates: Vec<WipGoalCandidate<'tcx>>, - pub kind: Option<CandidateKind<'tcx>>, + pub kind: Option<ProbeKind<'tcx>>, } impl<'tcx> WipGoalCandidate<'tcx> { @@ -357,11 +357,11 @@ impl<'tcx> ProofTreeBuilder<'tcx> { }) } - pub fn candidate_kind(&mut self, candidate_kind: CandidateKind<'tcx>) { + pub fn probe_kind(&mut self, probe_kind: ProbeKind<'tcx>) { if let Some(this) = self.as_mut() { match this { DebugSolver::GoalCandidate(this) => { - assert_eq!(this.kind.replace(candidate_kind), None) + assert_eq!(this.kind.replace(probe_kind), None) } _ => unreachable!(), } diff --git a/compiler/rustc_trait_selection/src/solve/project_goals.rs b/compiler/rustc_trait_selection/src/solve/project_goals.rs index df094af4f1f..3fe914e50be 100644 --- a/compiler/rustc_trait_selection/src/solve/project_goals.rs +++ b/compiler/rustc_trait_selection/src/solve/project_goals.rs @@ -8,8 +8,9 @@ use rustc_hir::LangItem; use rustc_infer::traits::query::NoSolution; use rustc_infer::traits::specialization_graph::LeafDef; use rustc_infer::traits::Reveal; -use rustc_middle::traits::solve::inspect::CandidateKind; -use rustc_middle::traits::solve::{CanonicalResponse, Certainty, Goal, QueryResult}; +use rustc_middle::traits::solve::{ + CandidateSource, CanonicalResponse, Certainty, Goal, QueryResult, +}; use rustc_middle::traits::BuiltinImplSource; use rustc_middle::ty::fast_reject::{DeepRejectCtxt, TreatParams}; use rustc_middle::ty::ProjectionPredicate; @@ -113,7 +114,7 @@ impl<'tcx> assembly::GoalKind<'tcx> for ProjectionPredicate<'tcx> { if let Some(projection_pred) = assumption.as_projection_clause() { if projection_pred.projection_def_id() == goal.predicate.def_id() { let tcx = ecx.tcx(); - ecx.probe_candidate("assumption").enter(|ecx| { + ecx.probe_misc_candidate("assumption").enter(|ecx| { let assumption_projection_pred = ecx.instantiate_binder_with_infer(projection_pred); ecx.eq( @@ -155,7 +156,7 @@ impl<'tcx> assembly::GoalKind<'tcx> for ProjectionPredicate<'tcx> { return Err(NoSolution); } - ecx.probe(|r| CandidateKind::Candidate { name: "impl".into(), result: *r }).enter(|ecx| { + ecx.probe_trait_candidate(CandidateSource::Impl(impl_def_id)).enter(|ecx| { let impl_args = ecx.fresh_args_for_item(impl_def_id); let impl_trait_ref = impl_trait_ref.instantiate(tcx, impl_args); @@ -369,7 +370,7 @@ impl<'tcx> assembly::GoalKind<'tcx> for ProjectionPredicate<'tcx> { goal: Goal<'tcx, Self>, ) -> QueryResult<'tcx> { let tcx = ecx.tcx(); - ecx.probe_candidate("builtin pointee").enter(|ecx| { + ecx.probe_misc_candidate("builtin pointee").enter(|ecx| { let metadata_ty = match goal.predicate.self_ty().kind() { ty::Bool | ty::Char @@ -578,7 +579,7 @@ impl<'tcx> assembly::GoalKind<'tcx> for ProjectionPredicate<'tcx> { ), }; - ecx.probe_candidate("builtin discriminant kind").enter(|ecx| { + ecx.probe_misc_candidate("builtin discriminant kind").enter(|ecx| { ecx.eq(goal.param_env, goal.predicate.term, discriminant_ty.into()) .expect("expected goal term to be fully unconstrained"); ecx.evaluate_added_goals_and_make_canonical_response(Certainty::Yes) diff --git a/compiler/rustc_trait_selection/src/solve/trait_goals.rs b/compiler/rustc_trait_selection/src/solve/trait_goals.rs index 8685f3100a8..f18eed94a68 100644 --- a/compiler/rustc_trait_selection/src/solve/trait_goals.rs +++ b/compiler/rustc_trait_selection/src/solve/trait_goals.rs @@ -5,7 +5,7 @@ use super::{EvalCtxt, SolverMode}; use rustc_hir::def_id::DefId; use rustc_hir::{LangItem, Movability}; use rustc_infer::traits::query::NoSolution; -use rustc_middle::traits::solve::inspect::CandidateKind; +use rustc_middle::traits::solve::inspect::ProbeKind; use rustc_middle::traits::solve::{CanonicalResponse, Certainty, Goal, QueryResult}; use rustc_middle::traits::{BuiltinImplSource, Reveal}; use rustc_middle::ty::fast_reject::{DeepRejectCtxt, TreatParams, TreatProjections}; @@ -61,7 +61,7 @@ impl<'tcx> assembly::GoalKind<'tcx> for TraitPredicate<'tcx> { }, }; - ecx.probe_candidate("impl").enter(|ecx| { + ecx.probe_misc_candidate("impl").enter(|ecx| { let impl_args = ecx.fresh_args_for_item(impl_def_id); let impl_trait_ref = impl_trait_ref.instantiate(tcx, impl_args); @@ -96,7 +96,7 @@ impl<'tcx> assembly::GoalKind<'tcx> for TraitPredicate<'tcx> { && trait_clause.polarity() == goal.predicate.polarity { // FIXME: Constness - ecx.probe_candidate("assumption").enter(|ecx| { + ecx.probe_misc_candidate("assumption").enter(|ecx| { let assumption_trait_pred = ecx.instantiate_binder_with_infer(trait_clause); ecx.eq( goal.param_env, @@ -167,7 +167,7 @@ impl<'tcx> assembly::GoalKind<'tcx> for TraitPredicate<'tcx> { let tcx = ecx.tcx(); - ecx.probe_candidate("trait alias").enter(|ecx| { + ecx.probe_misc_candidate("trait alias").enter(|ecx| { let nested_obligations = tcx .predicates_of(goal.predicate.def_id()) .instantiate(tcx, goal.predicate.trait_ref.args); @@ -427,7 +427,7 @@ impl<'tcx> assembly::GoalKind<'tcx> for TraitPredicate<'tcx> { ecx: &mut EvalCtxt<'_, 'tcx>, goal: Goal<'tcx, Self>, ) -> QueryResult<'tcx> { - ecx.probe(|_| CandidateKind::UnsizeAssembly).enter(|ecx| { + ecx.probe(|_| ProbeKind::UnsizeAssembly).enter(|ecx| { let a_ty = goal.predicate.self_ty(); // We need to normalize the b_ty since it's destructured as a `dyn Trait`. let Some(b_ty) = @@ -491,7 +491,7 @@ impl<'tcx> assembly::GoalKind<'tcx> for TraitPredicate<'tcx> { Err(NoSolution) => vec![], }; - ecx.probe(|_| CandidateKind::UnsizeAssembly).enter(|ecx| { + ecx.probe(|_| ProbeKind::UnsizeAssembly).enter(|ecx| { let a_ty = goal.predicate.self_ty(); // We need to normalize the b_ty since it's matched structurally // in the other functions below. @@ -597,7 +597,7 @@ impl<'tcx> EvalCtxt<'_, 'tcx> { self.walk_vtable( a_principal.with_self_ty(tcx, a_ty), |ecx, new_a_principal, _, vtable_vptr_slot| { - if let Ok(resp) = ecx.probe_candidate("dyn upcast").enter(|ecx| { + if let Ok(resp) = ecx.probe_misc_candidate("dyn upcast").enter(|ecx| { ecx.consider_builtin_upcast_to_principal( goal, a_data, @@ -640,7 +640,7 @@ impl<'tcx> EvalCtxt<'_, 'tcx> { target_projection: ty::PolyExistentialProjection<'tcx>| { source_projection.item_def_id() == target_projection.item_def_id() && ecx - .probe(|_| CandidateKind::UpcastProbe) + .probe(|_| ProbeKind::UpcastProjectionCompatibility) .enter(|ecx| -> Result<(), NoSolution> { ecx.eq(param_env, source_projection, target_projection)?; let _ = ecx.try_evaluate_added_goals()?; @@ -918,7 +918,7 @@ impl<'tcx> EvalCtxt<'_, 'tcx> { goal: Goal<'tcx, TraitPredicate<'tcx>>, constituent_tys: impl Fn(&EvalCtxt<'_, 'tcx>, Ty<'tcx>) -> Result<Vec<Ty<'tcx>>, NoSolution>, ) -> QueryResult<'tcx> { - self.probe_candidate("constituent tys").enter(|ecx| { + self.probe_misc_candidate("constituent tys").enter(|ecx| { ecx.add_goals( constituent_tys(ecx, goal.predicate.self_ty())? .into_iter() |