1
   2
   3
   4
   5
   6
   7
   8
   9
  10
  11
  12
  13
  14
  15
  16
  17
  18
  19
  20
  21
  22
  23
  24
  25
  26
  27
  28
  29
  30
  31
  32
  33
  34
  35
  36
  37
  38
  39
  40
  41
  42
  43
  44
  45
  46
  47
  48
  49
  50
  51
  52
  53
  54
  55
  56
  57
  58
  59
  60
  61
  62
  63
  64
  65
  66
  67
  68
  69
  70
  71
  72
  73
  74
  75
  76
  77
  78
  79
  80
  81
  82
  83
  84
  85
  86
  87
  88
  89
  90
  91
  92
  93
  94
  95
  96
  97
  98
  99
 100
 101
 102
 103
 104
 105
 106
 107
 108
 109
 110
 111
 112
 113
 114
 115
 116
 117
 118
 119
 120
 121
 122
 123
 124
 125
 126
 127
 128
 129
 130
 131
 132
 133
 134
 135
 136
 137
 138
 139
 140
 141
 142
 143
 144
 145
 146
 147
 148
 149
 150
 151
 152
 153
 154
 155
 156
 157
 158
 159
 160
 161
 162
 163
 164
 165
 166
 167
 168
 169
 170
 171
 172
 173
 174
 175
 176
 177
 178
 179
 180
 181
 182
 183
 184
 185
 186
 187
 188
 189
 190
 191
 192
 193
 194
 195
 196
 197
 198
 199
 200
 201
 202
 203
 204
 205
 206
 207
 208
 209
 210
 211
 212
 213
 214
 215
 216
 217
 218
 219
 220
 221
 222
 223
 224
 225
 226
 227
 228
 229
 230
 231
 232
 233
 234
 235
 236
 237
 238
 239
 240
 241
 242
 243
 244
 245
 246
 247
 248
 249
 250
 251
 252
 253
 254
 255
 256
 257
 258
 259
 260
 261
 262
 263
 264
 265
 266
 267
 268
 269
 270
 271
 272
 273
 274
 275
 276
 277
 278
 279
 280
 281
 282
 283
 284
 285
 286
 287
 288
 289
 290
 291
 292
 293
 294
 295
 296
 297
 298
 299
 300
 301
 302
 303
 304
 305
 306
 307
 308
 309
 310
 311
 312
 313
 314
 315
 316
 317
 318
 319
 320
 321
 322
 323
 324
 325
 326
 327
 328
 329
 330
 331
 332
 333
 334
 335
 336
 337
 338
 339
 340
 341
 342
 343
 344
 345
 346
 347
 348
 349
 350
 351
 352
 353
 354
 355
 356
 357
 358
 359
 360
 361
 362
 363
 364
 365
 366
 367
 368
 369
 370
 371
 372
 373
 374
 375
 376
 377
 378
 379
 380
 381
 382
 383
 384
 385
 386
 387
 388
 389
 390
 391
 392
 393
 394
 395
 396
 397
 398
 399
 400
 401
 402
 403
 404
 405
 406
 407
 408
 409
 410
 411
 412
 413
 414
 415
 416
 417
 418
 419
 420
 421
 422
 423
 424
 425
 426
 427
 428
 429
 430
 431
 432
 433
 434
 435
 436
 437
 438
 439
 440
 441
 442
 443
 444
 445
 446
 447
 448
 449
 450
 451
 452
 453
 454
 455
 456
 457
 458
 459
 460
 461
 462
 463
 464
 465
 466
 467
 468
 469
 470
 471
 472
 473
 474
 475
 476
 477
 478
 479
 480
 481
 482
 483
 484
 485
 486
 487
 488
 489
 490
 491
 492
 493
 494
 495
 496
 497
 498
 499
 500
 501
 502
 503
 504
 505
 506
 507
 508
 509
 510
 511
 512
 513
 514
 515
 516
 517
 518
 519
 520
 521
 522
 523
 524
 525
 526
 527
 528
 529
 530
 531
 532
 533
 534
 535
 536
 537
 538
 539
 540
 541
 542
 543
 544
 545
 546
 547
 548
 549
 550
 551
 552
 553
 554
 555
 556
 557
 558
 559
 560
 561
 562
 563
 564
 565
 566
 567
 568
 569
 570
 571
 572
 573
 574
 575
 576
 577
 578
 579
 580
 581
 582
 583
 584
 585
 586
 587
 588
 589
 590
 591
 592
 593
 594
 595
 596
 597
 598
 599
 600
 601
 602
 603
 604
 605
 606
 607
 608
 609
 610
 611
 612
 613
 614
 615
 616
 617
 618
 619
 620
 621
 622
 623
 624
 625
 626
 627
 628
 629
 630
 631
 632
 633
 634
 635
 636
 637
 638
 639
 640
 641
 642
 643
 644
 645
 646
 647
 648
 649
 650
 651
 652
 653
 654
 655
 656
 657
 658
 659
 660
 661
 662
 663
 664
 665
 666
 667
 668
 669
 670
 671
 672
 673
 674
 675
 676
 677
 678
 679
 680
 681
 682
 683
 684
 685
 686
 687
 688
 689
 690
 691
 692
 693
 694
 695
 696
 697
 698
 699
 700
 701
 702
 703
 704
 705
 706
 707
 708
 709
 710
 711
 712
 713
 714
 715
 716
 717
 718
 719
 720
 721
 722
 723
 724
 725
 726
 727
 728
 729
 730
 731
 732
 733
 734
 735
 736
 737
 738
 739
 740
 741
 742
 743
 744
 745
 746
 747
 748
 749
 750
 751
 752
 753
 754
 755
 756
 757
 758
 759
 760
 761
 762
 763
 764
 765
 766
 767
 768
 769
 770
 771
 772
 773
 774
 775
 776
 777
 778
 779
 780
 781
 782
 783
 784
 785
 786
 787
 788
 789
 790
 791
 792
 793
 794
 795
 796
 797
 798
 799
 800
 801
 802
 803
 804
 805
 806
 807
 808
 809
 810
 811
 812
 813
 814
 815
 816
 817
 818
 819
 820
 821
 822
 823
 824
 825
 826
 827
 828
 829
 830
 831
 832
 833
 834
 835
 836
 837
 838
 839
 840
 841
 842
 843
 844
 845
 846
 847
 848
 849
 850
 851
 852
 853
 854
 855
 856
 857
 858
 859
 860
 861
 862
 863
 864
 865
 866
 867
 868
 869
 870
 871
 872
 873
 874
 875
 876
 877
 878
 879
 880
 881
 882
 883
 884
 885
 886
 887
 888
 889
 890
 891
 892
 893
 894
 895
 896
 897
 898
 899
 900
 901
 902
 903
 904
 905
 906
 907
 908
 909
 910
 911
 912
 913
 914
 915
 916
 917
 918
 919
 920
 921
 922
 923
 924
 925
 926
 927
 928
 929
 930
 931
 932
 933
 934
 935
 936
 937
 938
 939
 940
 941
 942
 943
 944
 945
 946
 947
 948
 949
 950
 951
 952
 953
 954
 955
 956
 957
 958
 959
 960
 961
 962
 963
 964
 965
 966
 967
 968
 969
 970
 971
 972
 973
 974
 975
 976
 977
 978
 979
 980
 981
 982
 983
 984
 985
 986
 987
 988
 989
 990
 991
 992
 993
 994
 995
 996
 997
 998
 999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
//! The implementation of the query system itself. This defines the macros that
//! generate the actual methods on tcx which find and execute the provider,
//! manage the caches, and so forth.

use crate::dep_graph::{DepKind, DepNode, DepNodeIndex, SerializedDepNodeIndex};
use crate::ty::query::config::{QueryConfig, QueryDescription};
use crate::ty::query::job::{QueryInfo, QueryJob};
use crate::ty::query::Query;
use crate::ty::tls;
use crate::ty::{self, TyCtxt};

#[cfg(not(parallel_compiler))]
use rustc_data_structures::cold_path;
use rustc_data_structures::fx::{FxHashMap, FxHasher};
#[cfg(parallel_compiler)]
use rustc_data_structures::profiling::TimingGuard;
use rustc_data_structures::sharded::Sharded;
use rustc_data_structures::sync::{Lock, Lrc};
use rustc_data_structures::thin_vec::ThinVec;
use rustc_errors::{struct_span_err, Diagnostic, DiagnosticBuilder, FatalError, Handler, Level};
use rustc_span::source_map::DUMMY_SP;
use rustc_span::Span;
use std::collections::hash_map::Entry;
use std::hash::{Hash, Hasher};
use std::mem;
use std::ptr;

pub struct QueryCache<'tcx, D: QueryConfig<'tcx> + ?Sized> {
    pub(super) results: FxHashMap<D::Key, QueryValue<D::Value>>,
    pub(super) active: FxHashMap<D::Key, QueryResult<'tcx>>,
    #[cfg(debug_assertions)]
    pub(super) cache_hits: usize,
}

pub(super) struct QueryValue<T> {
    pub(super) value: T,
    pub(super) index: DepNodeIndex,
}

impl<T> QueryValue<T> {
    pub(super) fn new(value: T, dep_node_index: DepNodeIndex) -> QueryValue<T> {
        QueryValue { value, index: dep_node_index }
    }
}

/// Indicates the state of a query for a given key in a query map.
pub(super) enum QueryResult<'tcx> {
    /// An already executing query. The query job can be used to await for its completion.
    Started(Lrc<QueryJob<'tcx>>),

    /// The query panicked. Queries trying to wait on this will raise a fatal error or
    /// silently panic.
    Poisoned,
}

impl<'tcx, M: QueryConfig<'tcx>> Default for QueryCache<'tcx, M> {
    fn default() -> QueryCache<'tcx, M> {
        QueryCache {
            results: FxHashMap::default(),
            active: FxHashMap::default(),
            #[cfg(debug_assertions)]
            cache_hits: 0,
        }
    }
}

/// A type representing the responsibility to execute the job in the `job` field.
/// This will poison the relevant query if dropped.
pub(super) struct JobOwner<'a, 'tcx, Q: QueryDescription<'tcx>> {
    cache: &'a Sharded<QueryCache<'tcx, Q>>,
    key: Q::Key,
    job: Lrc<QueryJob<'tcx>>,
}

impl<'a, 'tcx, Q: QueryDescription<'tcx>> JobOwner<'a, 'tcx, Q> {
    /// Either gets a `JobOwner` corresponding the query, allowing us to
    /// start executing the query, or returns with the result of the query.
    /// If the query is executing elsewhere, this will wait for it.
    /// If the query panicked, this will silently panic.
    ///
    /// This function is inlined because that results in a noticeable speed-up
    /// for some compile-time benchmarks.
    #[inline(always)]
    pub(super) fn try_get(tcx: TyCtxt<'tcx>, span: Span, key: &Q::Key) -> TryGetJob<'a, 'tcx, Q> {
        // Handling the `query_blocked_prof_timer` is a bit weird because of the
        // control flow in this function: Blocking is implemented by
        // awaiting a running job and, once that is done, entering the loop below
        // again from the top. In that second iteration we will hit the
        // cache which provides us with the information we need for
        // finishing the "query-blocked" event.
        //
        // We thus allocate `query_blocked_prof_timer` outside the loop,
        // initialize it during the first iteration and finish it during the
        // second iteration.
        #[cfg(parallel_compiler)]
        let mut query_blocked_prof_timer: Option<TimingGuard<'_>> = None;

        let cache = Q::query_cache(tcx);
        loop {
            // We compute the key's hash once and then use it for both the
            // shard lookup and the hashmap lookup. This relies on the fact
            // that both of them use `FxHasher`.
            let mut state = FxHasher::default();
            key.hash(&mut state);
            let key_hash = state.finish();

            let mut lock = cache.get_shard_by_hash(key_hash).lock();
            if let Some((_, value)) =
                lock.results.raw_entry().from_key_hashed_nocheck(key_hash, key)
            {
                if unlikely!(tcx.prof.enabled()) {
                    tcx.prof.query_cache_hit(value.index.into());

                    #[cfg(parallel_compiler)]
                    {
                        if let Some(prof_timer) = query_blocked_prof_timer.take() {
                            prof_timer.finish_with_query_invocation_id(value.index.into());
                        }
                    }
                }

                let result = (value.value.clone(), value.index);
                #[cfg(debug_assertions)]
                {
                    lock.cache_hits += 1;
                }
                return TryGetJob::JobCompleted(result);
            }

            let job = match lock.active.entry((*key).clone()) {
                Entry::Occupied(entry) => {
                    match *entry.get() {
                        QueryResult::Started(ref job) => {
                            // For parallel queries, we'll block and wait until the query running
                            // in another thread has completed. Record how long we wait in the
                            // self-profiler.
                            #[cfg(parallel_compiler)]
                            {
                                query_blocked_prof_timer = Some(tcx.prof.query_blocked());
                            }

                            job.clone()
                        }
                        QueryResult::Poisoned => FatalError.raise(),
                    }
                }
                Entry::Vacant(entry) => {
                    // No job entry for this query. Return a new one to be started later.
                    return tls::with_related_context(tcx, |icx| {
                        // Create the `parent` variable before `info`. This allows LLVM
                        // to elide the move of `info`
                        let parent = icx.query.clone();
                        let info = QueryInfo { span, query: Q::query(key.clone()) };
                        let job = Lrc::new(QueryJob::new(info, parent));
                        let owner = JobOwner { cache, job: job.clone(), key: (*key).clone() };
                        entry.insert(QueryResult::Started(job));
                        TryGetJob::NotYetStarted(owner)
                    });
                }
            };
            mem::drop(lock);

            // If we are single-threaded we know that we have cycle error,
            // so we just return the error.
            #[cfg(not(parallel_compiler))]
            return TryGetJob::Cycle(cold_path(|| {
                Q::handle_cycle_error(tcx, job.find_cycle_in_stack(tcx, span))
            }));

            // With parallel queries we might just have to wait on some other
            // thread.
            #[cfg(parallel_compiler)]
            {
                let result = job.r#await(tcx, span);

                if let Err(cycle) = result {
                    return TryGetJob::Cycle(Q::handle_cycle_error(tcx, cycle));
                }
            }
        }
    }

    /// Completes the query by updating the query cache with the `result`,
    /// signals the waiter and forgets the JobOwner, so it won't poison the query
    #[inline(always)]
    pub(super) fn complete(self, result: &Q::Value, dep_node_index: DepNodeIndex) {
        // We can move out of `self` here because we `mem::forget` it below
        let key = unsafe { ptr::read(&self.key) };
        let job = unsafe { ptr::read(&self.job) };
        let cache = self.cache;

        // Forget ourself so our destructor won't poison the query
        mem::forget(self);

        let value = QueryValue::new(result.clone(), dep_node_index);
        {
            let mut lock = cache.get_shard_by_value(&key).lock();
            lock.active.remove(&key);
            lock.results.insert(key, value);
        }

        job.signal_complete();
    }
}

#[inline(always)]
fn with_diagnostics<F, R>(f: F) -> (R, ThinVec<Diagnostic>)
where
    F: FnOnce(Option<&Lock<ThinVec<Diagnostic>>>) -> R,
{
    let diagnostics = Lock::new(ThinVec::new());
    let result = f(Some(&diagnostics));
    (result, diagnostics.into_inner())
}

impl<'a, 'tcx, Q: QueryDescription<'tcx>> Drop for JobOwner<'a, 'tcx, Q> {
    #[inline(never)]
    #[cold]
    fn drop(&mut self) {
        // Poison the query so jobs waiting on it panic.
        let shard = self.cache.get_shard_by_value(&self.key);
        shard.lock().active.insert(self.key.clone(), QueryResult::Poisoned);
        // Also signal the completion of the job, so waiters
        // will continue execution.
        self.job.signal_complete();
    }
}

#[derive(Clone)]
pub struct CycleError<'tcx> {
    /// The query and related span that uses the cycle.
    pub(super) usage: Option<(Span, Query<'tcx>)>,
    pub(super) cycle: Vec<QueryInfo<'tcx>>,
}

/// The result of `try_get_lock`.
pub(super) enum TryGetJob<'a, 'tcx, D: QueryDescription<'tcx>> {
    /// The query is not yet started. Contains a guard to the cache eventually used to start it.
    NotYetStarted(JobOwner<'a, 'tcx, D>),

    /// The query was already completed.
    /// Returns the result of the query and its dep-node index
    /// if it succeeded or a cycle error if it failed.
    JobCompleted((D::Value, DepNodeIndex)),

    /// Trying to execute the query resulted in a cycle.
    Cycle(D::Value),
}

impl<'tcx> TyCtxt<'tcx> {
    /// Executes a job by changing the `ImplicitCtxt` to point to the
    /// new query job while it executes. It returns the diagnostics
    /// captured during execution and the actual result.
    #[inline(always)]
    pub(super) fn start_query<F, R>(
        self,
        job: Lrc<QueryJob<'tcx>>,
        diagnostics: Option<&Lock<ThinVec<Diagnostic>>>,
        compute: F,
    ) -> R
    where
        F: FnOnce(TyCtxt<'tcx>) -> R,
    {
        // The `TyCtxt` stored in TLS has the same global interner lifetime
        // as `self`, so we use `with_related_context` to relate the 'tcx lifetimes
        // when accessing the `ImplicitCtxt`.
        tls::with_related_context(self, move |current_icx| {
            // Update the `ImplicitCtxt` to point to our new query job.
            let new_icx = tls::ImplicitCtxt {
                tcx: self,
                query: Some(job),
                diagnostics,
                layout_depth: current_icx.layout_depth,
                task_deps: current_icx.task_deps,
            };

            // Use the `ImplicitCtxt` while we execute the query.
            tls::enter_context(&new_icx, |_| compute(self))
        })
    }

    #[inline(never)]
    #[cold]
    pub(super) fn report_cycle(
        self,
        CycleError { usage, cycle: stack }: CycleError<'tcx>,
    ) -> DiagnosticBuilder<'tcx> {
        assert!(!stack.is_empty());

        let fix_span = |span: Span, query: &Query<'tcx>| {
            self.sess.source_map().def_span(query.default_span(self, span))
        };

        // Disable naming impls with types in this path, since that
        // sometimes cycles itself, leading to extra cycle errors.
        // (And cycle errors around impls tend to occur during the
        // collect/coherence phases anyhow.)
        ty::print::with_forced_impl_filename_line(|| {
            let span = fix_span(stack[1 % stack.len()].span, &stack[0].query);
            let mut err = struct_span_err!(
                self.sess,
                span,
                E0391,
                "cycle detected when {}",
                stack[0].query.describe(self)
            );

            for i in 1..stack.len() {
                let query = &stack[i].query;
                let span = fix_span(stack[(i + 1) % stack.len()].span, query);
                err.span_note(span, &format!("...which requires {}...", query.describe(self)));
            }

            err.note(&format!(
                "...which again requires {}, completing the cycle",
                stack[0].query.describe(self)
            ));

            if let Some((span, query)) = usage {
                err.span_note(
                    fix_span(span, &query),
                    &format!("cycle used when {}", query.describe(self)),
                );
            }

            err
        })
    }

    pub fn try_print_query_stack(handler: &Handler) {
        eprintln!("query stack during panic:");

        // Be careful reyling on global state here: this code is called from
        // a panic hook, which means that the global `Handler` may be in a weird
        // state if it was responsible for triggering the panic.
        tls::with_context_opt(|icx| {
            if let Some(icx) = icx {
                let mut current_query = icx.query.clone();
                let mut i = 0;

                while let Some(query) = current_query {
                    let mut diag = Diagnostic::new(
                        Level::FailureNote,
                        &format!(
                            "#{} [{}] {}",
                            i,
                            query.info.query.name(),
                            query.info.query.describe(icx.tcx)
                        ),
                    );
                    diag.span = icx.tcx.sess.source_map().def_span(query.info.span).into();
                    handler.force_print_diagnostic(diag);

                    current_query = query.parent.clone();
                    i += 1;
                }
            }
        });

        eprintln!("end of query stack");
    }

    #[inline(never)]
    pub(super) fn get_query<Q: QueryDescription<'tcx>>(self, span: Span, key: Q::Key) -> Q::Value {
        debug!("ty::query::get_query<{}>(key={:?}, span={:?})", Q::NAME, key, span);

        let job = match JobOwner::try_get(self, span, &key) {
            TryGetJob::NotYetStarted(job) => job,
            TryGetJob::Cycle(result) => return result,
            TryGetJob::JobCompleted((v, index)) => {
                self.dep_graph.read_index(index);
                return v;
            }
        };

        // Fast path for when incr. comp. is off. `to_dep_node` is
        // expensive for some `DepKind`s.
        if !self.dep_graph.is_fully_enabled() {
            let null_dep_node = DepNode::new_no_params(crate::dep_graph::DepKind::Null);
            return self.force_query_with_job::<Q>(key, job, null_dep_node).0;
        }

        if Q::ANON {
            let prof_timer = self.prof.query_provider();

            let ((result, dep_node_index), diagnostics) = with_diagnostics(|diagnostics| {
                self.start_query(job.job.clone(), diagnostics, |tcx| {
                    tcx.dep_graph.with_anon_task(Q::dep_kind(), || Q::compute(tcx, key))
                })
            });

            prof_timer.finish_with_query_invocation_id(dep_node_index.into());

            self.dep_graph.read_index(dep_node_index);

            if unlikely!(!diagnostics.is_empty()) {
                self.queries
                    .on_disk_cache
                    .store_diagnostics_for_anon_node(dep_node_index, diagnostics);
            }

            job.complete(&result, dep_node_index);

            return result;
        }

        let dep_node = Q::to_dep_node(self, &key);

        if !Q::EVAL_ALWAYS {
            // The diagnostics for this query will be
            // promoted to the current session during
            // `try_mark_green()`, so we can ignore them here.
            let loaded = self.start_query(job.job.clone(), None, |tcx| {
                let marked = tcx.dep_graph.try_mark_green_and_read(tcx, &dep_node);
                marked.map(|(prev_dep_node_index, dep_node_index)| {
                    (
                        tcx.load_from_disk_and_cache_in_memory::<Q>(
                            key.clone(),
                            prev_dep_node_index,
                            dep_node_index,
                            &dep_node,
                        ),
                        dep_node_index,
                    )
                })
            });
            if let Some((result, dep_node_index)) = loaded {
                job.complete(&result, dep_node_index);
                return result;
            }
        }

        let (result, dep_node_index) = self.force_query_with_job::<Q>(key, job, dep_node);
        self.dep_graph.read_index(dep_node_index);
        result
    }

    fn load_from_disk_and_cache_in_memory<Q: QueryDescription<'tcx>>(
        self,
        key: Q::Key,
        prev_dep_node_index: SerializedDepNodeIndex,
        dep_node_index: DepNodeIndex,
        dep_node: &DepNode,
    ) -> Q::Value {
        // Note this function can be called concurrently from the same query
        // We must ensure that this is handled correctly.

        debug_assert!(self.dep_graph.is_green(dep_node));

        // First we try to load the result from the on-disk cache.
        let result = if Q::cache_on_disk(self, key.clone(), None)
            && self.sess.opts.debugging_opts.incremental_queries
        {
            let prof_timer = self.prof.incr_cache_loading();
            let result = Q::try_load_from_disk(self, prev_dep_node_index);
            prof_timer.finish_with_query_invocation_id(dep_node_index.into());

            // We always expect to find a cached result for things that
            // can be forced from `DepNode`.
            debug_assert!(
                !dep_node.kind.can_reconstruct_query_key() || result.is_some(),
                "missing on-disk cache entry for {:?}",
                dep_node
            );
            result
        } else {
            // Some things are never cached on disk.
            None
        };

        let result = if let Some(result) = result {
            result
        } else {
            // We could not load a result from the on-disk cache, so
            // recompute.
            let prof_timer = self.prof.query_provider();

            // The dep-graph for this computation is already in-place.
            let result = self.dep_graph.with_ignore(|| Q::compute(self, key));

            prof_timer.finish_with_query_invocation_id(dep_node_index.into());

            result
        };

        // If `-Zincremental-verify-ich` is specified, re-hash results from
        // the cache and make sure that they have the expected fingerprint.
        if unlikely!(self.sess.opts.debugging_opts.incremental_verify_ich) {
            self.incremental_verify_ich::<Q>(&result, dep_node, dep_node_index);
        }

        result
    }

    #[inline(never)]
    #[cold]
    fn incremental_verify_ich<Q: QueryDescription<'tcx>>(
        self,
        result: &Q::Value,
        dep_node: &DepNode,
        dep_node_index: DepNodeIndex,
    ) {
        use crate::ich::Fingerprint;

        assert!(
            Some(self.dep_graph.fingerprint_of(dep_node_index))
                == self.dep_graph.prev_fingerprint_of(dep_node),
            "fingerprint for green query instance not loaded from cache: {:?}",
            dep_node,
        );

        debug!("BEGIN verify_ich({:?})", dep_node);
        let mut hcx = self.create_stable_hashing_context();

        let new_hash = Q::hash_result(&mut hcx, result).unwrap_or(Fingerprint::ZERO);
        debug!("END verify_ich({:?})", dep_node);

        let old_hash = self.dep_graph.fingerprint_of(dep_node_index);

        assert!(new_hash == old_hash, "found unstable fingerprints for {:?}", dep_node,);
    }

    #[inline(always)]
    fn force_query_with_job<Q: QueryDescription<'tcx>>(
        self,
        key: Q::Key,
        job: JobOwner<'_, 'tcx, Q>,
        dep_node: DepNode,
    ) -> (Q::Value, DepNodeIndex) {
        // If the following assertion triggers, it can have two reasons:
        // 1. Something is wrong with DepNode creation, either here or
        //    in `DepGraph::try_mark_green()`.
        // 2. Two distinct query keys get mapped to the same `DepNode`
        //    (see for example #48923).
        assert!(
            !self.dep_graph.dep_node_exists(&dep_node),
            "forcing query with already existing `DepNode`\n\
                 - query-key: {:?}\n\
                 - dep-node: {:?}",
            key,
            dep_node
        );

        let prof_timer = self.prof.query_provider();

        let ((result, dep_node_index), diagnostics) = with_diagnostics(|diagnostics| {
            self.start_query(job.job.clone(), diagnostics, |tcx| {
                if Q::EVAL_ALWAYS {
                    tcx.dep_graph.with_eval_always_task(
                        dep_node,
                        tcx,
                        key,
                        Q::compute,
                        Q::hash_result,
                    )
                } else {
                    tcx.dep_graph.with_task(dep_node, tcx, key, Q::compute, Q::hash_result)
                }
            })
        });

        prof_timer.finish_with_query_invocation_id(dep_node_index.into());

        if unlikely!(!diagnostics.is_empty()) {
            if dep_node.kind != crate::dep_graph::DepKind::Null {
                self.queries.on_disk_cache.store_diagnostics(dep_node_index, diagnostics);
            }
        }

        job.complete(&result, dep_node_index);

        (result, dep_node_index)
    }

    /// Ensure that either this query has all green inputs or been executed.
    /// Executing `query::ensure(D)` is considered a read of the dep-node `D`.
    ///
    /// This function is particularly useful when executing passes for their
    /// side-effects -- e.g., in order to report errors for erroneous programs.
    ///
    /// Note: The optimization is only available during incr. comp.
    pub(super) fn ensure_query<Q: QueryDescription<'tcx>>(self, key: Q::Key) -> () {
        if Q::EVAL_ALWAYS {
            let _ = self.get_query::<Q>(DUMMY_SP, key);
            return;
        }

        // Ensuring an anonymous query makes no sense
        assert!(!Q::ANON);

        let dep_node = Q::to_dep_node(self, &key);

        match self.dep_graph.try_mark_green_and_read(self, &dep_node) {
            None => {
                // A None return from `try_mark_green_and_read` means that this is either
                // a new dep node or that the dep node has already been marked red.
                // Either way, we can't call `dep_graph.read()` as we don't have the
                // DepNodeIndex. We must invoke the query itself. The performance cost
                // this introduces should be negligible as we'll immediately hit the
                // in-memory cache, or another query down the line will.
                let _ = self.get_query::<Q>(DUMMY_SP, key);
            }
            Some((_, dep_node_index)) => {
                self.prof.query_cache_hit(dep_node_index.into());
            }
        }
    }

    #[allow(dead_code)]
    fn force_query<Q: QueryDescription<'tcx>>(self, key: Q::Key, span: Span, dep_node: DepNode) {
        // We may be concurrently trying both execute and force a query.
        // Ensure that only one of them runs the query.
        let job = match JobOwner::try_get(self, span, &key) {
            TryGetJob::NotYetStarted(job) => job,
            TryGetJob::Cycle(_) | TryGetJob::JobCompleted(_) => return,
        };
        self.force_query_with_job::<Q>(key, job, dep_node);
    }
}

macro_rules! handle_cycle_error {
    ([][$tcx: expr, $error:expr]) => {{
        $tcx.report_cycle($error).emit();
        Value::from_cycle_error($tcx)
    }};
    ([fatal_cycle$(, $modifiers:ident)*][$tcx:expr, $error:expr]) => {{
        $tcx.report_cycle($error).emit();
        $tcx.sess.abort_if_errors();
        unreachable!()
    }};
    ([cycle_delay_bug$(, $modifiers:ident)*][$tcx:expr, $error:expr]) => {{
        $tcx.report_cycle($error).delay_as_bug();
        Value::from_cycle_error($tcx)
    }};
    ([$other:ident$(, $modifiers:ident)*][$($args:tt)*]) => {
        handle_cycle_error!([$($modifiers),*][$($args)*])
    };
}

macro_rules! is_anon {
    ([]) => {{
        false
    }};
    ([anon$(, $modifiers:ident)*]) => {{
        true
    }};
    ([$other:ident$(, $modifiers:ident)*]) => {
        is_anon!([$($modifiers),*])
    };
}

macro_rules! is_eval_always {
    ([]) => {{
        false
    }};
    ([eval_always$(, $modifiers:ident)*]) => {{
        true
    }};
    ([$other:ident$(, $modifiers:ident)*]) => {
        is_eval_always!([$($modifiers),*])
    };
}

macro_rules! hash_result {
    ([][$hcx:expr, $result:expr]) => {{
        dep_graph::hash_result($hcx, &$result)
    }};
    ([no_hash$(, $modifiers:ident)*][$hcx:expr, $result:expr]) => {{
        None
    }};
    ([$other:ident$(, $modifiers:ident)*][$($args:tt)*]) => {
        hash_result!([$($modifiers),*][$($args)*])
    };
}

macro_rules! define_queries {
    (<$tcx:tt> $($category:tt {
        $($(#[$attr:meta])* [$($modifiers:tt)*] fn $name:ident: $node:ident($K:ty) -> $V:ty,)*
    },)*) => {
        define_queries_inner! { <$tcx>
            $($( $(#[$attr])* category<$category> [$($modifiers)*] fn $name: $node($K) -> $V,)*)*
        }
    }
}

macro_rules! define_queries_inner {
    (<$tcx:tt>
     $($(#[$attr:meta])* category<$category:tt>
        [$($modifiers:tt)*] fn $name:ident: $node:ident($K:ty) -> $V:ty,)*) => {

        use std::mem;
        use rustc_data_structures::sharded::Sharded;
        use crate::{
            rustc_data_structures::stable_hasher::HashStable,
            rustc_data_structures::stable_hasher::StableHasher,
            ich::StableHashingContext
        };
        use rustc_data_structures::profiling::ProfileCategory;

        define_queries_struct! {
            tcx: $tcx,
            input: ($(([$($modifiers)*] [$($attr)*] [$name]))*)
        }

        impl<$tcx> Queries<$tcx> {
            pub fn new(
                providers: IndexVec<CrateNum, Providers<$tcx>>,
                fallback_extern_providers: Providers<$tcx>,
                on_disk_cache: OnDiskCache<'tcx>,
            ) -> Self {
                Queries {
                    providers,
                    fallback_extern_providers: Box::new(fallback_extern_providers),
                    on_disk_cache,
                    $($name: Default::default()),*
                }
            }

            #[cfg(parallel_compiler)]
            pub fn collect_active_jobs(&self) -> Vec<Lrc<QueryJob<$tcx>>> {
                let mut jobs = Vec::new();

                // We use try_lock_shards here since we are only called from the
                // deadlock handler, and this shouldn't be locked.
                $(
                    let shards = self.$name.try_lock_shards().unwrap();
                    jobs.extend(shards.iter().flat_map(|shard| shard.active.values().filter_map(|v|
                        if let QueryResult::Started(ref job) = *v {
                            Some(job.clone())
                        } else {
                            None
                        }
                    )));
                )*

                jobs
            }

            pub fn print_stats(&self) {
                let mut queries = Vec::new();

                #[derive(Clone)]
                struct QueryStats {
                    name: &'static str,
                    cache_hits: usize,
                    key_size: usize,
                    key_type: &'static str,
                    value_size: usize,
                    value_type: &'static str,
                    entry_count: usize,
                }

                fn stats<'tcx, Q: QueryConfig<'tcx>>(
                    name: &'static str,
                    map: &Sharded<QueryCache<'tcx, Q>>,
                ) -> QueryStats {
                    let map = map.lock_shards();
                    QueryStats {
                        name,
                        #[cfg(debug_assertions)]
                        cache_hits: map.iter().map(|shard| shard.cache_hits).sum(),
                        #[cfg(not(debug_assertions))]
                        cache_hits: 0,
                        key_size: mem::size_of::<Q::Key>(),
                        key_type: type_name::<Q::Key>(),
                        value_size: mem::size_of::<Q::Value>(),
                        value_type: type_name::<Q::Value>(),
                        entry_count: map.iter().map(|shard| shard.results.len()).sum(),
                    }
                }

                $(
                    queries.push(stats::<queries::$name<'_>>(
                        stringify!($name),
                        &self.$name,
                    ));
                )*

                if cfg!(debug_assertions) {
                    let hits: usize = queries.iter().map(|s| s.cache_hits).sum();
                    let results: usize = queries.iter().map(|s| s.entry_count).sum();
                    println!("\nQuery cache hit rate: {}", hits as f64 / (hits + results) as f64);
                }

                let mut query_key_sizes = queries.clone();
                query_key_sizes.sort_by_key(|q| q.key_size);
                println!("\nLarge query keys:");
                for q in query_key_sizes.iter().rev()
                                        .filter(|q| q.key_size > 8) {
                    println!(
                        "   {} - {} x {} - {}",
                        q.name,
                        q.key_size,
                        q.entry_count,
                        q.key_type
                    );
                }

                let mut query_value_sizes = queries.clone();
                query_value_sizes.sort_by_key(|q| q.value_size);
                println!("\nLarge query values:");
                for q in query_value_sizes.iter().rev()
                                          .filter(|q| q.value_size > 8) {
                    println!(
                        "   {} - {} x {} - {}",
                        q.name,
                        q.value_size,
                        q.entry_count,
                        q.value_type
                    );
                }

                if cfg!(debug_assertions) {
                    let mut query_cache_hits = queries.clone();
                    query_cache_hits.sort_by_key(|q| q.cache_hits);
                    println!("\nQuery cache hits:");
                    for q in query_cache_hits.iter().rev() {
                        println!(
                            "   {} - {} ({}%)",
                            q.name,
                            q.cache_hits,
                            q.cache_hits as f64 / (q.cache_hits + q.entry_count) as f64
                        );
                    }
                }

                let mut query_value_count = queries.clone();
                query_value_count.sort_by_key(|q| q.entry_count);
                println!("\nQuery value count:");
                for q in query_value_count.iter().rev() {
                    println!("   {} - {}", q.name, q.entry_count);
                }
            }
        }

        #[allow(nonstandard_style)]
        #[derive(Clone, Debug)]
        pub enum Query<$tcx> {
            $($(#[$attr])* $name($K)),*
        }

        impl<$tcx> Query<$tcx> {
            pub fn name(&self) -> &'static str {
                match *self {
                    $(Query::$name(_) => stringify!($name),)*
                }
            }

            pub fn describe(&self, tcx: TyCtxt<'_>) -> Cow<'static, str> {
                let (r, name) = match *self {
                    $(Query::$name(key) => {
                        (queries::$name::describe(tcx, key), stringify!($name))
                    })*
                };
                if tcx.sess.verbose() {
                    format!("{} [{}]", r, name).into()
                } else {
                    r
                }
            }

            // FIXME(eddyb) Get more valid `Span`s on queries.
            pub fn default_span(&self, tcx: TyCtxt<$tcx>, span: Span) -> Span {
                if !span.is_dummy() {
                    return span;
                }
                // The `def_span` query is used to calculate `default_span`,
                // so exit to avoid infinite recursion.
                if let Query::def_span(..) = *self {
                    return span
                }
                match *self {
                    $(Query::$name(key) => key.default_span(tcx),)*
                }
            }
        }

        impl<'a, $tcx> HashStable<StableHashingContext<'a>> for Query<$tcx> {
            fn hash_stable(&self, hcx: &mut StableHashingContext<'a>, hasher: &mut StableHasher) {
                mem::discriminant(self).hash_stable(hcx, hasher);
                match *self {
                    $(Query::$name(key) => key.hash_stable(hcx, hasher),)*
                }
            }
        }

        pub mod queries {
            use std::marker::PhantomData;

            $(#[allow(nonstandard_style)]
            pub struct $name<$tcx> {
                data: PhantomData<&$tcx ()>
            })*
        }

        // This module and the functions in it exist only to provide a
        // predictable symbol name prefix for query providers. This is helpful
        // for analyzing queries in profilers.
        pub(super) mod __query_compute {
            $(#[inline(never)]
            pub fn $name<F: FnOnce() -> R, R>(f: F) -> R {
                f()
            })*
        }

        $(impl<$tcx> QueryConfig<$tcx> for queries::$name<$tcx> {
            type Key = $K;
            type Value = $V;

            const NAME: &'static str = stringify!($name);
            const CATEGORY: ProfileCategory = $category;
        }

        impl<$tcx> QueryAccessors<$tcx> for queries::$name<$tcx> {
            const ANON: bool = is_anon!([$($modifiers)*]);
            const EVAL_ALWAYS: bool = is_eval_always!([$($modifiers)*]);

            #[inline(always)]
            fn query(key: Self::Key) -> Query<'tcx> {
                Query::$name(key)
            }

            #[inline(always)]
            fn query_cache<'a>(tcx: TyCtxt<$tcx>) -> &'a Sharded<QueryCache<$tcx, Self>> {
                &tcx.queries.$name
            }

            #[allow(unused)]
            #[inline(always)]
            fn to_dep_node(tcx: TyCtxt<$tcx>, key: &Self::Key) -> DepNode {
                use crate::dep_graph::DepConstructor::*;

                DepNode::new(tcx, $node(*key))
            }

            #[inline(always)]
            fn dep_kind() -> dep_graph::DepKind {
                dep_graph::DepKind::$node
            }

            #[inline]
            fn compute(tcx: TyCtxt<'tcx>, key: Self::Key) -> Self::Value {
                __query_compute::$name(move || {
                    let provider = tcx.queries.providers.get(key.query_crate())
                        // HACK(eddyb) it's possible crates may be loaded after
                        // the query engine is created, and because crate loading
                        // is not yet integrated with the query engine, such crates
                        // would be missing appropriate entries in `providers`.
                        .unwrap_or(&tcx.queries.fallback_extern_providers)
                        .$name;
                    provider(tcx, key)
                })
            }

            fn hash_result(
                _hcx: &mut StableHashingContext<'_>,
                _result: &Self::Value
            ) -> Option<Fingerprint> {
                hash_result!([$($modifiers)*][_hcx, _result])
            }

            fn handle_cycle_error(
                tcx: TyCtxt<'tcx>,
                error: CycleError<'tcx>
            ) -> Self::Value {
                handle_cycle_error!([$($modifiers)*][tcx, error])
            }
        })*

        #[derive(Copy, Clone)]
        pub struct TyCtxtEnsure<'tcx> {
            pub tcx: TyCtxt<'tcx>,
        }

        impl TyCtxtEnsure<$tcx> {
            $($(#[$attr])*
            #[inline(always)]
            pub fn $name(self, key: $K) {
                self.tcx.ensure_query::<queries::$name<'_>>(key)
            })*
        }

        #[derive(Copy, Clone)]
        pub struct TyCtxtAt<'tcx> {
            pub tcx: TyCtxt<'tcx>,
            pub span: Span,
        }

        impl Deref for TyCtxtAt<'tcx> {
            type Target = TyCtxt<'tcx>;
            #[inline(always)]
            fn deref(&self) -> &Self::Target {
                &self.tcx
            }
        }

        impl TyCtxt<$tcx> {
            /// Returns a transparent wrapper for `TyCtxt`, which ensures queries
            /// are executed instead of just returing their results.
            #[inline(always)]
            pub fn ensure(self) -> TyCtxtEnsure<$tcx> {
                TyCtxtEnsure {
                    tcx: self,
                }
            }

            /// Returns a transparent wrapper for `TyCtxt` which uses
            /// `span` as the location of queries performed through it.
            #[inline(always)]
            pub fn at(self, span: Span) -> TyCtxtAt<$tcx> {
                TyCtxtAt {
                    tcx: self,
                    span
                }
            }

            $($(#[$attr])*
            #[inline(always)]
            pub fn $name(self, key: $K) -> $V {
                self.at(DUMMY_SP).$name(key)
            })*

            /// All self-profiling events generated by the query engine use
            /// virtual `StringId`s for their `event_id`. This method makes all
            /// those virtual `StringId`s point to actual strings.
            ///
            /// If we are recording only summary data, the ids will point to
            /// just the query names. If we are recording query keys too, we
            /// allocate the corresponding strings here.
            pub fn alloc_self_profile_query_strings(self) {
                use crate::ty::query::profiling_support::{
                    alloc_self_profile_query_strings_for_query_cache,
                    QueryKeyStringCache,
                };

                if !self.prof.enabled() {
                    return;
                }

                let mut string_cache = QueryKeyStringCache::new();

                $({
                    alloc_self_profile_query_strings_for_query_cache(
                        self,
                        stringify!($name),
                        &self.queries.$name,
                        &mut string_cache,
                    );
                })*
            }
        }

        impl TyCtxtAt<$tcx> {
            $($(#[$attr])*
            #[inline(always)]
            pub fn $name(self, key: $K) -> $V {
                self.tcx.get_query::<queries::$name<'_>>(self.span, key)
            })*
        }

        define_provider_struct! {
            tcx: $tcx,
            input: ($(([$($modifiers)*] [$name] [$K] [$V]))*)
        }

        impl<$tcx> Copy for Providers<$tcx> {}
        impl<$tcx> Clone for Providers<$tcx> {
            fn clone(&self) -> Self { *self }
        }
    }
}

macro_rules! define_queries_struct {
    (tcx: $tcx:tt,
     input: ($(([$($modifiers:tt)*] [$($attr:tt)*] [$name:ident]))*)) => {
        pub struct Queries<$tcx> {
            /// This provides access to the incrimental comilation on-disk cache for query results.
            /// Do not access this directly. It is only meant to be used by
            /// `DepGraph::try_mark_green()` and the query infrastructure.
            pub(crate) on_disk_cache: OnDiskCache<'tcx>,

            providers: IndexVec<CrateNum, Providers<$tcx>>,
            fallback_extern_providers: Box<Providers<$tcx>>,

            $($(#[$attr])*  $name: Sharded<QueryCache<$tcx, queries::$name<$tcx>>>,)*
        }
    };
}

macro_rules! define_provider_struct {
    (tcx: $tcx:tt,
     input: ($(([$($modifiers:tt)*] [$name:ident] [$K:ty] [$R:ty]))*)) => {
        pub struct Providers<$tcx> {
            $(pub $name: fn(TyCtxt<$tcx>, $K) -> $R,)*
        }

        impl<$tcx> Default for Providers<$tcx> {
            fn default() -> Self {
                $(fn $name<$tcx>(_: TyCtxt<$tcx>, key: $K) -> $R {
                    bug!("`tcx.{}({:?})` unsupported by its crate",
                         stringify!($name), key);
                })*
                Providers { $($name),* }
            }
        }
    };
}

/// The red/green evaluation system will try to mark a specific DepNode in the
/// dependency graph as green by recursively trying to mark the dependencies of
/// that `DepNode` as green. While doing so, it will sometimes encounter a `DepNode`
/// where we don't know if it is red or green and we therefore actually have
/// to recompute its value in order to find out. Since the only piece of
/// information that we have at that point is the `DepNode` we are trying to
/// re-evaluate, we need some way to re-run a query from just that. This is what
/// `force_from_dep_node()` implements.
///
/// In the general case, a `DepNode` consists of a `DepKind` and an opaque
/// GUID/fingerprint that will uniquely identify the node. This GUID/fingerprint
/// is usually constructed by computing a stable hash of the query-key that the
/// `DepNode` corresponds to. Consequently, it is not in general possible to go
/// back from hash to query-key (since hash functions are not reversible). For
/// this reason `force_from_dep_node()` is expected to fail from time to time
/// because we just cannot find out, from the `DepNode` alone, what the
/// corresponding query-key is and therefore cannot re-run the query.
///
/// The system deals with this case letting `try_mark_green` fail which forces
/// the root query to be re-evaluated.
///
/// Now, if `force_from_dep_node()` would always fail, it would be pretty useless.
/// Fortunately, we can use some contextual information that will allow us to
/// reconstruct query-keys for certain kinds of `DepNode`s. In particular, we
/// enforce by construction that the GUID/fingerprint of certain `DepNode`s is a
/// valid `DefPathHash`. Since we also always build a huge table that maps every
/// `DefPathHash` in the current codebase to the corresponding `DefId`, we have
/// everything we need to re-run the query.
///
/// Take the `mir_validated` query as an example. Like many other queries, it
/// just has a single parameter: the `DefId` of the item it will compute the
/// validated MIR for. Now, when we call `force_from_dep_node()` on a `DepNode`
/// with kind `MirValidated`, we know that the GUID/fingerprint of the `DepNode`
/// is actually a `DefPathHash`, and can therefore just look up the corresponding
/// `DefId` in `tcx.def_path_hash_to_def_id`.
///
/// When you implement a new query, it will likely have a corresponding new
/// `DepKind`, and you'll have to support it here in `force_from_dep_node()`. As
/// a rule of thumb, if your query takes a `DefId` or `DefIndex` as sole parameter,
/// then `force_from_dep_node()` should not fail for it. Otherwise, you can just
/// add it to the "We don't have enough information to reconstruct..." group in
/// the match below.
pub fn force_from_dep_node(tcx: TyCtxt<'_>, dep_node: &DepNode) -> bool {
    use crate::dep_graph::RecoverKey;

    // We must avoid ever having to call `force_from_dep_node()` for a
    // `DepNode::codegen_unit`:
    // Since we cannot reconstruct the query key of a `DepNode::codegen_unit`, we
    // would always end up having to evaluate the first caller of the
    // `codegen_unit` query that *is* reconstructible. This might very well be
    // the `compile_codegen_unit` query, thus re-codegenning the whole CGU just
    // to re-trigger calling the `codegen_unit` query with the right key. At
    // that point we would already have re-done all the work we are trying to
    // avoid doing in the first place.
    // The solution is simple: Just explicitly call the `codegen_unit` query for
    // each CGU, right after partitioning. This way `try_mark_green` will always
    // hit the cache instead of having to go through `force_from_dep_node`.
    // This assertion makes sure, we actually keep applying the solution above.
    debug_assert!(
        dep_node.kind != DepKind::codegen_unit,
        "calling force_from_dep_node() on DepKind::codegen_unit"
    );

    if !dep_node.kind.can_reconstruct_query_key() {
        return false;
    }

    rustc_dep_node_force!([dep_node, tcx]
        // These are inputs that are expected to be pre-allocated and that
        // should therefore always be red or green already.
        DepKind::AllLocalTraitImpls |
        DepKind::Krate |
        DepKind::CrateMetadata |
        DepKind::HirBody |
        DepKind::Hir |

        // These are anonymous nodes.
        DepKind::TraitSelect |

        // We don't have enough information to reconstruct the query key of
        // these.
        DepKind::CompileCodegenUnit => {
            bug!("force_from_dep_node: encountered {:?}", dep_node)
        }

        DepKind::Analysis => {
            let def_id = if let Some(def_id) = dep_node.extract_def_id(tcx) {
                def_id
            } else {
                // Return from the whole function.
                return false
            };
            tcx.force_query::<crate::ty::query::queries::analysis<'_>>(
                def_id.krate,
                DUMMY_SP,
                *dep_node
            );
        }
    );

    true
}