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use global cache when computing proof trees

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This commit is contained in:
lcnr 2023-10-30 14:23:35 +01:00
parent 91bbdd927a
commit 15ae59ba03
11 changed files with 138 additions and 126 deletions
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1
compiler/rustc_middle/src/arena.rs
View File

@ -69,6 +69,7 @@ macro_rules! arena_types {
[] dtorck_constraint: rustc_middle::traits::query::DropckConstraint<'tcx>,
[] candidate_step: rustc_middle::traits::query::CandidateStep<'tcx>,
[] autoderef_bad_ty: rustc_middle::traits::query::MethodAutoderefBadTy<'tcx>,
[] canonical_goal_evaluation: rustc_middle::traits::solve::inspect::GoalEvaluationStep<'tcx>,
[] query_region_constraints: rustc_middle::infer::canonical::QueryRegionConstraints<'tcx>,
[] type_op_subtype:
rustc_middle::infer::canonical::Canonical<'tcx,

47
compiler/rustc_middle/src/traits/solve/cache.rs
View File

@ -1,4 +1,4 @@
use super::{CanonicalInput, QueryResult};
use super::{inspect, CanonicalInput, QueryResult};
use crate::ty::TyCtxt;
use rustc_data_structures::fx::{FxHashMap, FxHashSet};
use rustc_data_structures::sync::Lock;
@ -14,8 +14,10 @@ pub struct EvaluationCache<'tcx> {
map: Lock<FxHashMap<CanonicalInput<'tcx>, CacheEntry<'tcx>>>,
}
#[derive(PartialEq, Eq)]
pub struct CacheData<'tcx> {
pub result: QueryResult<'tcx>,
pub proof_tree: Option<&'tcx [inspect::GoalEvaluationStep<'tcx>]>,
pub reached_depth: usize,
pub encountered_overflow: bool,
}
@ -24,22 +26,33 @@ impl<'tcx> EvaluationCache<'tcx> {
/// Insert a final result into the global cache.
pub fn insert(
&self,
tcx: TyCtxt<'tcx>,
key: CanonicalInput<'tcx>,
proof_tree: Option<&'tcx [inspect::GoalEvaluationStep<'tcx>]>,
reached_depth: usize,
did_overflow: bool,
encountered_overflow: bool,
cycle_participants: FxHashSet<CanonicalInput<'tcx>>,
dep_node: DepNodeIndex,
result: QueryResult<'tcx>,
) {
let mut map = self.map.borrow_mut();
let entry = map.entry(key).or_default();
let data = WithDepNode::new(dep_node, result);
let data = WithDepNode::new(dep_node, QueryData { result, proof_tree });
entry.cycle_participants.extend(cycle_participants);
if did_overflow {
if encountered_overflow {
entry.with_overflow.insert(reached_depth, data);
} else {
entry.success = Some(Success { data, reached_depth });
}
if cfg!(debug_assertions) {
drop(map);
if Some(CacheData { result, proof_tree, reached_depth, encountered_overflow })
!= self.get(tcx, key, |_| false, Limit(reached_depth))
{
bug!("unable to retrieve inserted element from cache: {key:?}");
}
}
}
/// Try to fetch a cached result, checking the recursion limit
@ -62,27 +75,39 @@ impl<'tcx> EvaluationCache<'tcx> {
if let Some(ref success) = entry.success {
if available_depth.value_within_limit(success.reached_depth) {
let QueryData { result, proof_tree } = success.data.get(tcx);
return Some(CacheData {
result: success.data.get(tcx),
result,
proof_tree,
reached_depth: success.reached_depth,
encountered_overflow: false,
});
}
}
entry.with_overflow.get(&available_depth.0).map(|e| CacheData {
result: e.get(tcx),
reached_depth: available_depth.0,
encountered_overflow: true,
entry.with_overflow.get(&available_depth.0).map(|e| {
let QueryData { result, proof_tree } = e.get(tcx);
CacheData {
result,
proof_tree,
reached_depth: available_depth.0,
encountered_overflow: true,
}
})
}
}
struct Success<'tcx> {
data: WithDepNode<QueryResult<'tcx>>,
data: WithDepNode<QueryData<'tcx>>,
reached_depth: usize,
}
#[derive(Clone, Copy)]
pub struct QueryData<'tcx> {
pub result: QueryResult<'tcx>,
pub proof_tree: Option<&'tcx [inspect::GoalEvaluationStep<'tcx>]>,
}
/// The cache entry for a goal `CanonicalInput`.
///
/// This contains results whose computation never hit the
@ -96,5 +121,5 @@ struct CacheEntry<'tcx> {
/// See the doc comment of `StackEntry::cycle_participants` for more
/// details.
cycle_participants: FxHashSet<CanonicalInput<'tcx>>,
with_overflow: FxHashMap<usize, WithDepNode<QueryResult<'tcx>>>,
with_overflow: FxHashMap<usize, WithDepNode<QueryData<'tcx>>>,
}

10
compiler/rustc_middle/src/traits/solve/inspect.rs
View File

@ -42,12 +42,6 @@ pub struct State<'tcx, T> {
pub type CanonicalState<'tcx, T> = Canonical<'tcx, State<'tcx, T>>;
#[derive(Debug, Eq, PartialEq)]
pub enum CacheHit {
Provisional,
Global,
}
/// When evaluating the root goals we also store the
/// original values for the `CanonicalVarValues` of the
/// canonicalized goal. We use this to map any [CanonicalState]
@ -78,8 +72,8 @@ pub struct CanonicalGoalEvaluation<'tcx> {
#[derive(Eq, PartialEq)]
pub enum CanonicalGoalEvaluationKind<'tcx> {
Overflow,
CacheHit(CacheHit),
Uncached { revisions: Vec<GoalEvaluationStep<'tcx>> },
CycleInStack,
Evaluation { revisions: &'tcx [GoalEvaluationStep<'tcx>] },
}
impl Debug for GoalEvaluation<'_> {
fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {

9
compiler/rustc_middle/src/traits/solve/inspect/format.rs
View File

@ -74,13 +74,10 @@ impl<'a, 'b> ProofTreeFormatter<'a, 'b> {
CanonicalGoalEvaluationKind::Overflow => {
writeln!(self.f, "OVERFLOW: {:?}", eval.result)
}
CanonicalGoalEvaluationKind::CacheHit(CacheHit::Global) => {
writeln!(self.f, "GLOBAL CACHE HIT: {:?}", eval.result)
CanonicalGoalEvaluationKind::CycleInStack => {
writeln!(self.f, "CYCLE IN STACK: {:?}", eval.result)
}
CanonicalGoalEvaluationKind::CacheHit(CacheHit::Provisional) => {
writeln!(self.f, "PROVISIONAL CACHE HIT: {:?}", eval.result)
}
CanonicalGoalEvaluationKind::Uncached { revisions } => {
CanonicalGoalEvaluationKind::Evaluation { revisions } => {
for (n, step) in revisions.iter().enumerate() {
writeln!(self.f, "REVISION {n}")?;
self.nested(|this| this.format_evaluation_step(step))?;

2
compiler/rustc_session/src/options.rs
View File

@ -1529,8 +1529,6 @@ options! {
dump_solver_proof_tree: DumpSolverProofTree = (DumpSolverProofTree::Never, parse_dump_solver_proof_tree, [UNTRACKED],
"dump a proof tree for every goal evaluated by the new trait solver. If the flag is specified without any options after it
then it defaults to `always`. If the flag is not specified at all it defaults to `on-request`."),
dump_solver_proof_tree_use_cache: Option<bool> = (None, parse_opt_bool, [UNTRACKED],
"determines whether dumped proof trees use the global cache"),
dwarf_version: Option<u32> = (None, parse_opt_number, [TRACKED],
"version of DWARF debug information to emit (default: 2 or 4, depending on platform)"),
dylib_lto: bool = (false, parse_bool, [UNTRACKED],

16
compiler/rustc_trait_selection/src/solve/eval_ctxt/mod.rs
View File

@ -119,25 +119,11 @@ impl NestedGoals<'_> {
#[derive(PartialEq, Eq, Debug, Hash, HashStable, Clone, Copy)]
pub enum GenerateProofTree {
Yes(UseGlobalCache),
Yes,
IfEnabled,
Never,
}
#[derive(PartialEq, Eq, Debug, Hash, HashStable, Clone, Copy)]
pub enum UseGlobalCache {
Yes,
No,
}
impl UseGlobalCache {
pub fn from_bool(use_cache: bool) -> Self {
match use_cache {
true => UseGlobalCache::Yes,
false => UseGlobalCache::No,
}
}
}
pub trait InferCtxtEvalExt<'tcx> {
/// Evaluates a goal from **outside** of the trait solver.
///

12
compiler/rustc_trait_selection/src/solve/inspect/analyse.rs
View File

@ -17,7 +17,7 @@ use rustc_middle::traits::solve::{Certainty, Goal};
use rustc_middle::ty;
use crate::solve::inspect::ProofTreeBuilder;
use crate::solve::{GenerateProofTree, InferCtxtEvalExt, UseGlobalCache};
use crate::solve::{GenerateProofTree, InferCtxtEvalExt};
pub struct InspectGoal<'a, 'tcx> {
infcx: &'a InferCtxt<'tcx>,
@ -82,8 +82,7 @@ impl<'a, 'tcx> InspectCandidate<'a, 'tcx> {
}
for &goal in &instantiated_goals {
let (_, proof_tree) =
infcx.evaluate_root_goal(goal, GenerateProofTree::Yes(UseGlobalCache::No));
let (_, proof_tree) = infcx.evaluate_root_goal(goal, GenerateProofTree::Yes);
let proof_tree = proof_tree.unwrap();
visitor.visit_goal(&InspectGoal::new(
infcx,
@ -169,11 +168,11 @@ impl<'a, 'tcx> InspectGoal<'a, 'tcx> {
let mut candidates = vec![];
let last_eval_step = match self.evaluation.evaluation.kind {
inspect::CanonicalGoalEvaluationKind::Overflow
| inspect::CanonicalGoalEvaluationKind::CacheHit(_) => {
| inspect::CanonicalGoalEvaluationKind::CycleInStack => {
warn!("unexpected root evaluation: {:?}", self.evaluation);
return vec![];
}
inspect::CanonicalGoalEvaluationKind::Uncached { ref revisions } => {
inspect::CanonicalGoalEvaluationKind::Evaluation { ref revisions } => {
if let Some(last) = revisions.last() {
last
} else {
@ -227,8 +226,7 @@ impl<'tcx> ProofTreeInferCtxtExt<'tcx> for InferCtxt<'tcx> {
goal: Goal<'tcx, ty::Predicate<'tcx>>,
visitor: &mut V,
) -> ControlFlow<V::BreakTy> {
let (_, proof_tree) =
self.evaluate_root_goal(goal, GenerateProofTree::Yes(UseGlobalCache::No));
let (_, proof_tree) = self.evaluate_root_goal(goal, GenerateProofTree::Yes);
let proof_tree = proof_tree.unwrap();
visitor.visit_goal(&InspectGoal::new(self, 0, &proof_tree))
}

121
compiler/rustc_trait_selection/src/solve/inspect/build.rs
View File

@ -3,6 +3,8 @@
//! This code is *a bit* of a mess and can hopefully be
//! mostly ignored. For a general overview of how it works,
//! see the comment on [ProofTreeBuilder].
use std::mem;
use rustc_middle::traits::query::NoSolution;
use rustc_middle::traits::solve::{
CanonicalInput, Certainty, Goal, IsNormalizesToHack, QueryInput, QueryResult,
@ -10,7 +12,6 @@ use rustc_middle::traits::solve::{
use rustc_middle::ty::{self, TyCtxt};
use rustc_session::config::DumpSolverProofTree;
use crate::solve::eval_ctxt::UseGlobalCache;
use crate::solve::{self, inspect, EvalCtxt, GenerateProofTree};
/// The core data structure when building proof trees.
@ -34,12 +35,7 @@ use crate::solve::{self, inspect, EvalCtxt, GenerateProofTree};
/// is called to recursively convert the whole structure to a
/// finished proof tree.
pub(in crate::solve) struct ProofTreeBuilder<'tcx> {
state: Option<Box<BuilderData<'tcx>>>,
}
struct BuilderData<'tcx> {
tree: DebugSolver<'tcx>,
use_global_cache: UseGlobalCache,
state: Option<Box<DebugSolver<'tcx>>>,
}
/// The current state of the proof tree builder, at most places
@ -118,36 +114,46 @@ pub(in crate::solve) enum WipGoalEvaluationKind<'tcx> {
Nested { is_normalizes_to_hack: IsNormalizesToHack },
}
#[derive(Eq, PartialEq, Debug)]
pub(in crate::solve) enum WipCanonicalGoalEvaluationKind {
#[derive(Eq, PartialEq)]
pub(in crate::solve) enum WipCanonicalGoalEvaluationKind<'tcx> {
Overflow,
CacheHit(inspect::CacheHit),
CycleInStack,
Interned { revisions: &'tcx [inspect::GoalEvaluationStep<'tcx>] },
}
impl std::fmt::Debug for WipCanonicalGoalEvaluationKind<'_> {
fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
match self {
Self::Overflow => write!(f, "Overflow"),
Self::CycleInStack => write!(f, "CycleInStack"),
Self::Interned { revisions: _ } => f.debug_struct("Interned").finish_non_exhaustive(),
}
}
}
#[derive(Eq, PartialEq, Debug)]
struct WipCanonicalGoalEvaluation<'tcx> {
goal: CanonicalInput<'tcx>,
kind: Option<WipCanonicalGoalEvaluationKind>,
kind: Option<WipCanonicalGoalEvaluationKind<'tcx>>,
/// Only used for uncached goals. After we finished evaluating
/// the goal, this is interned and moved into `kind`.
revisions: Vec<WipGoalEvaluationStep<'tcx>>,
result: Option<QueryResult<'tcx>>,
}
impl<'tcx> WipCanonicalGoalEvaluation<'tcx> {
fn finalize(self) -> inspect::CanonicalGoalEvaluation<'tcx> {
let kind = match self.kind {
Some(WipCanonicalGoalEvaluationKind::Overflow) => {
assert!(self.revisions.is_empty());
let kind = match self.kind.unwrap() {
WipCanonicalGoalEvaluationKind::Overflow => {
inspect::CanonicalGoalEvaluationKind::Overflow
}
Some(WipCanonicalGoalEvaluationKind::CacheHit(hit)) => {
inspect::CanonicalGoalEvaluationKind::CacheHit(hit)
WipCanonicalGoalEvaluationKind::CycleInStack => {
inspect::CanonicalGoalEvaluationKind::CycleInStack
}
WipCanonicalGoalEvaluationKind::Interned { revisions } => {
inspect::CanonicalGoalEvaluationKind::Evaluation { revisions }
}
None => inspect::CanonicalGoalEvaluationKind::Uncached {
revisions: self
.revisions
.into_iter()
.map(WipGoalEvaluationStep::finalize)
.collect(),
},
};
inspect::CanonicalGoalEvaluation { goal: self.goal, kind, result: self.result.unwrap() }
@ -226,33 +232,20 @@ impl<'tcx> WipProbeStep<'tcx> {
}
impl<'tcx> ProofTreeBuilder<'tcx> {
fn new(
state: impl Into<DebugSolver<'tcx>>,
use_global_cache: UseGlobalCache,
) -> ProofTreeBuilder<'tcx> {
ProofTreeBuilder {
state: Some(Box::new(BuilderData { tree: state.into(), use_global_cache })),
}
fn new(state: impl Into<DebugSolver<'tcx>>) -> ProofTreeBuilder<'tcx> {
ProofTreeBuilder { state: Some(Box::new(state.into())) }
}
fn nested<T: Into<DebugSolver<'tcx>>>(&self, state: impl FnOnce() -> T) -> Self {
match &self.state {
Some(prev_state) => Self {
state: Some(Box::new(BuilderData {
tree: state().into(),
use_global_cache: prev_state.use_global_cache,
})),
},
None => Self { state: None },
}
ProofTreeBuilder { state: self.state.as_ref().map(|_| Box::new(state().into())) }
}
fn as_mut(&mut self) -> Option<&mut DebugSolver<'tcx>> {
self.state.as_mut().map(|boxed| &mut boxed.tree)
self.state.as_deref_mut()
}
pub fn finalize(self) -> Option<inspect::GoalEvaluation<'tcx>> {
match self.state?.tree {
match *self.state? {
DebugSolver::GoalEvaluation(wip_goal_evaluation) => {
Some(wip_goal_evaluation.finalize())
}
@ -260,13 +253,6 @@ impl<'tcx> ProofTreeBuilder<'tcx> {
}
}
pub fn use_global_cache(&self) -> bool {
self.state
.as_ref()
.map(|state| matches!(state.use_global_cache, UseGlobalCache::Yes))
.unwrap_or(true)
}
pub fn new_maybe_root(
tcx: TyCtxt<'tcx>,
generate_proof_tree: GenerateProofTree,
@ -276,10 +262,7 @@ impl<'tcx> ProofTreeBuilder<'tcx> {
GenerateProofTree::IfEnabled => {
let opts = &tcx.sess.opts.unstable_opts;
match opts.dump_solver_proof_tree {
DumpSolverProofTree::Always => {
let use_cache = opts.dump_solver_proof_tree_use_cache.unwrap_or(true);
ProofTreeBuilder::new_root(UseGlobalCache::from_bool(use_cache))
}
DumpSolverProofTree::Always => ProofTreeBuilder::new_root(),
// `OnError` is handled by reevaluating goals in error
// reporting with `GenerateProofTree::Yes`.
DumpSolverProofTree::OnError | DumpSolverProofTree::Never => {
@ -287,12 +270,12 @@ impl<'tcx> ProofTreeBuilder<'tcx> {
}
}
}
GenerateProofTree::Yes(use_cache) => ProofTreeBuilder::new_root(use_cache),
GenerateProofTree::Yes => ProofTreeBuilder::new_root(),
}
}
pub fn new_root(use_global_cache: UseGlobalCache) -> ProofTreeBuilder<'tcx> {
ProofTreeBuilder::new(DebugSolver::Root, use_global_cache)
pub fn new_root() -> ProofTreeBuilder<'tcx> {
ProofTreeBuilder::new(DebugSolver::Root)
}
pub fn new_noop() -> ProofTreeBuilder<'tcx> {
@ -336,9 +319,27 @@ impl<'tcx> ProofTreeBuilder<'tcx> {
})
}
pub fn finalize_evaluation(
&mut self,
tcx: TyCtxt<'tcx>,
) -> Option<&'tcx [inspect::GoalEvaluationStep<'tcx>]> {
self.as_mut().map(|this| match this {
DebugSolver::CanonicalGoalEvaluation(evaluation) => {
let revisions = mem::take(&mut evaluation.revisions)
.into_iter()
.map(WipGoalEvaluationStep::finalize);
let revisions = &*tcx.arena.alloc_from_iter(revisions);
let kind = WipCanonicalGoalEvaluationKind::Interned { revisions };
assert_eq!(evaluation.kind.replace(kind), None);
revisions
}
_ => unreachable!(),
})
}
pub fn canonical_goal_evaluation(&mut self, canonical_goal_evaluation: ProofTreeBuilder<'tcx>) {
if let Some(this) = self.as_mut() {
match (this, canonical_goal_evaluation.state.unwrap().tree) {
match (this, *canonical_goal_evaluation.state.unwrap()) {
(
DebugSolver::GoalEvaluation(goal_evaluation),
DebugSolver::CanonicalGoalEvaluation(canonical_goal_evaluation),
@ -348,7 +349,7 @@ impl<'tcx> ProofTreeBuilder<'tcx> {
}
}
pub fn goal_evaluation_kind(&mut self, kind: WipCanonicalGoalEvaluationKind) {
pub fn goal_evaluation_kind(&mut self, kind: WipCanonicalGoalEvaluationKind<'tcx>) {
if let Some(this) = self.as_mut() {
match this {
DebugSolver::CanonicalGoalEvaluation(canonical_goal_evaluation) => {
@ -372,7 +373,7 @@ impl<'tcx> ProofTreeBuilder<'tcx> {
}
pub fn goal_evaluation(&mut self, goal_evaluation: ProofTreeBuilder<'tcx>) {
if let Some(this) = self.as_mut() {
match (this, goal_evaluation.state.unwrap().tree) {
match (this, *goal_evaluation.state.unwrap()) {
(
DebugSolver::AddedGoalsEvaluation(WipAddedGoalsEvaluation {
evaluations, ..
@ -396,7 +397,7 @@ impl<'tcx> ProofTreeBuilder<'tcx> {
}
pub fn goal_evaluation_step(&mut self, goal_evaluation_step: ProofTreeBuilder<'tcx>) {
if let Some(this) = self.as_mut() {
match (this, goal_evaluation_step.state.unwrap().tree) {
match (this, *goal_evaluation_step.state.unwrap()) {
(
DebugSolver::CanonicalGoalEvaluation(canonical_goal_evaluations),
DebugSolver::GoalEvaluationStep(goal_evaluation_step),
@ -444,7 +445,7 @@ impl<'tcx> ProofTreeBuilder<'tcx> {
pub fn finish_probe(&mut self, probe: ProofTreeBuilder<'tcx>) {
if let Some(this) = self.as_mut() {
match (this, probe.state.unwrap().tree) {
match (this, *probe.state.unwrap()) {
(
DebugSolver::Probe(WipProbe { steps, .. })
| DebugSolver::GoalEvaluationStep(WipGoalEvaluationStep {
@ -486,7 +487,7 @@ impl<'tcx> ProofTreeBuilder<'tcx> {
pub fn added_goals_evaluation(&mut self, added_goals_evaluation: ProofTreeBuilder<'tcx>) {
if let Some(this) = self.as_mut() {
match (this, added_goals_evaluation.state.unwrap().tree) {
match (this, *added_goals_evaluation.state.unwrap()) {
(
DebugSolver::GoalEvaluationStep(WipGoalEvaluationStep {
evaluation: WipProbe { steps, .. },

4
compiler/rustc_trait_selection/src/solve/mod.rs
View File

@ -38,9 +38,7 @@ mod project_goals;
mod search_graph;
mod trait_goals;
pub use eval_ctxt::{
EvalCtxt, GenerateProofTree, InferCtxtEvalExt, InferCtxtSelectExt, UseGlobalCache,
};
pub use eval_ctxt::{EvalCtxt, GenerateProofTree, InferCtxtEvalExt, InferCtxtSelectExt};
pub use fulfill::FulfillmentCtxt;
pub(crate) use normalize::{deeply_normalize, deeply_normalize_with_skipped_universes};

38
compiler/rustc_trait_selection/src/solve/search_graph.rs
View File

@ -6,7 +6,6 @@ use rustc_data_structures::fx::FxHashSet;
use rustc_index::Idx;
use rustc_index::IndexVec;
use rustc_middle::dep_graph::dep_kinds;
use rustc_middle::traits::solve::inspect::CacheHit;
use rustc_middle::traits::solve::CacheData;
use rustc_middle::traits::solve::{CanonicalInput, Certainty, EvaluationCache, QueryResult};
use rustc_middle::ty::TyCtxt;
@ -191,8 +190,8 @@ impl<'tcx> SearchGraph<'tcx> {
};
// Try to fetch the goal from the global cache.
if inspect.use_global_cache() {
if let Some(CacheData { result, reached_depth, encountered_overflow }) =
'global: {
let Some(CacheData { result, proof_tree, reached_depth, encountered_overflow }) =
self.global_cache(tcx).get(
tcx,
input,
@ -201,13 +200,26 @@ impl<'tcx> SearchGraph<'tcx> {
},
available_depth,
)
{
inspect.goal_evaluation_kind(inspect::WipCanonicalGoalEvaluationKind::CacheHit(
CacheHit::Global,
));
self.on_cache_hit(reached_depth, encountered_overflow);
return result;
else {
break 'global;
};
// If we're building a proof tree and the current cache entry does not
// contain a proof tree, we do not use the entry but instead recompute
// the goal. We simply overwrite the existing entry once we're done,
// caching the proof tree.
if !inspect.is_noop() {
if let Some(revisions) = proof_tree {
inspect.goal_evaluation_kind(
inspect::WipCanonicalGoalEvaluationKind::Interned { revisions },
);
} else {
break 'global;
}
}
self.on_cache_hit(reached_depth, encountered_overflow);
return result;
}
// Check whether we're in a cycle.
@ -238,9 +250,7 @@ impl<'tcx> SearchGraph<'tcx> {
// Finally we can return either the provisional response for that goal if we have a
// coinductive cycle or an ambiguous result if the cycle is inductive.
Entry::Occupied(entry) => {
inspect.goal_evaluation_kind(inspect::WipCanonicalGoalEvaluationKind::CacheHit(
CacheHit::Provisional,
));
inspect.goal_evaluation_kind(inspect::WipCanonicalGoalEvaluationKind::CycleInStack);
let stack_depth = *entry.get();
debug!("encountered cycle with depth {stack_depth:?}");
@ -329,6 +339,8 @@ impl<'tcx> SearchGraph<'tcx> {
(current_entry, result)
});
let proof_tree = inspect.finalize_evaluation(tcx);
// We're now done with this goal. In case this goal is involved in a larger cycle
// do not remove it from the provisional cache and update its provisional result.
// We only add the root of cycles to the global cache.
@ -346,7 +358,9 @@ impl<'tcx> SearchGraph<'tcx> {
// more details.
let reached_depth = final_entry.reached_depth.as_usize() - self.stack.len();
self.global_cache(tcx).insert(
tcx,
input,
proof_tree,
reached_depth,
final_entry.encountered_overflow,
final_entry.cycle_participants,

4
compiler/rustc_trait_selection/src/traits/error_reporting/mod.rs
View File

@ -8,7 +8,7 @@ mod type_err_ctxt_ext;
use super::{Obligation, ObligationCause, ObligationCauseCode, PredicateObligation};
use crate::infer::InferCtxt;
use crate::solve::{GenerateProofTree, InferCtxtEvalExt, UseGlobalCache};
use crate::solve::{GenerateProofTree, InferCtxtEvalExt};
use rustc_hir as hir;
use rustc_hir::def_id::DefId;
use rustc_hir::intravisit::Visitor;
@ -173,7 +173,7 @@ pub fn dump_proof_tree<'tcx>(o: &Obligation<'tcx, ty::Predicate<'tcx>>, infcx: &
infcx.probe(|_| {
let goal = Goal { predicate: o.predicate, param_env: o.param_env };
let tree = infcx
.evaluate_root_goal(goal, GenerateProofTree::Yes(UseGlobalCache::No))
.evaluate_root_goal(goal, GenerateProofTree::Yes)
.1
.expect("proof tree should have been generated");
let mut lock = std::io::stdout().lock();