src/librustc/ty/query/plumbing.rs

   1 // Copyright 2012-2015 The Rust Project Developers. See the COPYRIGHT
   2 // file at the top-level directory of this distribution and at
   3 // http://rust-lang.org/COPYRIGHT.
   4 //
   5 // Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
   6 // http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
   7 // <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
   8 // option. This file may not be copied, modified, or distributed
   9 // except according to those terms.
  10
  11 //! The implementation of the query system itself. Defines the macros
  12 //! that generate the actual methods on tcx which find and execute the
  13 //! provider, manage the caches, and so forth.
  14
  15 use dep_graph::{DepNodeIndex, DepNode, DepKind, DepNodeColor};
  16 use errors::DiagnosticBuilder;
  17 use errors::Level;
  18 use errors::Diagnostic;
  19 use errors::FatalError;
  20 use ty::tls;
  21 use ty::{TyCtxt};
  22 use ty::query::Query;
  23 use ty::query::config::{QueryConfig, QueryDescription};
  24 use ty::query::job::{QueryJob, QueryResult, QueryInfo};
  25 use ty::item_path;
  26
  27 use util::common::{profq_msg, ProfileQueriesMsg, QueryMsg};
  28
  29 use rustc_data_structures::fx::{FxHashMap};
  30 use rustc_data_structures::sync::{Lrc, Lock};
  31 use std::mem;
  32 use std::ptr;
  33 use std::collections::hash_map::Entry;
  34 use syntax_pos::Span;
  35 use syntax::codemap::DUMMY_SP;
  36
  37 pub struct QueryCache<'tcx, D: QueryConfig<'tcx> + ?Sized> {
  38     pub(super) results: FxHashMap<D::Key, QueryValue<D::Value>>,
  39     pub(super) active: FxHashMap<D::Key, QueryResult<'tcx>>,
  40 }
  41
  42 pub(super) struct QueryValue<T> {
  43     pub(super) value: T,
  44     pub(super) index: DepNodeIndex,
  45 }
  46
  47 impl<T> QueryValue<T> {
  48     pub(super) fn new(value: T,
  49                       dep_node_index: DepNodeIndex)
  50                       -> QueryValue<T> {
  51         QueryValue {
  52             value,
  53             index: dep_node_index,
  54         }
  55     }
  56 }
  57
  58 impl<'tcx, M: QueryConfig<'tcx>> QueryCache<'tcx, M> {
  59     pub(super) fn new() -> QueryCache<'tcx, M> {
  60         QueryCache {
  61             results: FxHashMap(),
  62             active: FxHashMap(),
  63         }
  64     }
  65 }
  66
  67 // If enabled, send a message to the profile-queries thread
  68 macro_rules! profq_msg {
  69     ($tcx:expr, $msg:expr) => {
  70         if cfg!(debug_assertions) {
  71             if $tcx.sess.profile_queries() {
  72                 profq_msg($tcx.sess, $msg)
  73             }
  74         }
  75     }
  76 }
  77
  78 // If enabled, format a key using its debug string, which can be
  79 // expensive to compute (in terms of time).
  80 macro_rules! profq_query_msg {
  81     ($query:expr, $tcx:expr, $key:expr) => {{
  82         let msg = if cfg!(debug_assertions) {
  83             if $tcx.sess.profile_queries_and_keys() {
  84                 Some(format!("{:?}", $key))
  85             } else { None }
  86         } else { None };
  87         QueryMsg {
  88             query: $query,
  89             msg,
  90         }
  91     }}
  92 }
  93
  94 /// A type representing the responsibility to execute the job in the `job` field.
  95 /// This will poison the relevant query if dropped.
  96 pub(super) struct JobOwner<'a, 'tcx: 'a, Q: QueryDescription<'tcx> + 'a> {
  97     cache: &'a Lock<QueryCache<'tcx, Q>>,
  98     key: Q::Key,
  99     job: Lrc<QueryJob<'tcx>>,
 100 }
 101
 102 impl<'a, 'tcx, Q: QueryDescription<'tcx>> JobOwner<'a, 'tcx, Q> {
 103     /// Either gets a JobOwner corresponding the the query, allowing us to
 104     /// start executing the query, or it returns with the result of the query.
 105     /// If the query is executing elsewhere, this will wait for it.
 106     /// If the query panicked, this will silently panic.
 107     ///
 108     /// This function is inlined because that results in a noticeable speedup
 109     /// for some compile-time benchmarks.
 110     #[inline(always)]
 111     pub(super) fn try_get(
 112         tcx: TyCtxt<'a, 'tcx, '_>,
 113         span: Span,
 114         key: &Q::Key,
 115     ) -> TryGetJob<'a, 'tcx, Q> {
 116         let cache = Q::query_cache(tcx);
 117         loop {
 118             let mut lock = cache.borrow_mut();
 119             if let Some(value) = lock.results.get(key) {
 120                 profq_msg!(tcx, ProfileQueriesMsg::CacheHit);
 121                 let result = Ok((value.value.clone(), value.index));
 122                 return TryGetJob::JobCompleted(result);
 123             }
 124             let job = match lock.active.entry((*key).clone()) {
 125                 Entry::Occupied(entry) => {
 126                     match *entry.get() {
 127                         QueryResult::Started(ref job) => job.clone(),
 128                         QueryResult::Poisoned => FatalError.raise(),
 129                     }
 130                 }
 131                 Entry::Vacant(entry) => {
 132                     // No job entry for this query. Return a new one to be started later
 133                     return tls::with_related_context(tcx, |icx| {
 134                         let info = QueryInfo {
 135                             span,
 136                             query: Q::query(key.clone()),
 137                         };
 138                         let job = Lrc::new(QueryJob::new(info, icx.query.clone()));
 139                         let owner = JobOwner {
 140                             cache,
 141                             job: job.clone(),
 142                             key: (*key).clone(),
 143                         };
 144                         entry.insert(QueryResult::Started(job));
 145                         TryGetJob::NotYetStarted(owner)
 146                     })
 147                 }
 148             };
 149             mem::drop(lock);
 150
 151             if let Err(cycle) = job.await(tcx, span) {
 152                 return TryGetJob::JobCompleted(Err(cycle));
 153             }
 154         }
 155     }
 156
 157     /// Completes the query by updating the query cache with the `result`,
 158     /// signals the waiter and forgets the JobOwner, so it won't poison the query
 159     pub(super) fn complete(self, result: &Q::Value, dep_node_index: DepNodeIndex) {
 160         // We can move out of `self` here because we `mem::forget` it below
 161         let key = unsafe { ptr::read(&self.key) };
 162         let job = unsafe { ptr::read(&self.job) };
 163         let cache = self.cache;
 164
 165         // Forget ourself so our destructor won't poison the query
 166         mem::forget(self);
 167
 168         let value = QueryValue::new(result.clone(), dep_node_index);
 169         {
 170             let mut lock = cache.borrow_mut();
 171             lock.active.remove(&key);
 172             lock.results.insert(key, value);
 173         }
 174
 175         job.signal_complete();
 176     }
 177
 178     /// Executes a job by changing the ImplicitCtxt to point to the
 179     /// new query job while it executes. It returns the diagnostics
 180     /// captured during execution and the actual result.
 181     pub(super) fn start<'lcx, F, R>(
 182         &self,
 183         tcx: TyCtxt<'_, 'tcx, 'lcx>,
 184         compute: F)
 185     -> (R, Vec<Diagnostic>)
 186     where
 187         F: for<'b> FnOnce(TyCtxt<'b, 'tcx, 'lcx>) -> R
 188     {
 189         // The TyCtxt stored in TLS has the same global interner lifetime
 190         // as `tcx`, so we use `with_related_context` to relate the 'gcx lifetimes
 191         // when accessing the ImplicitCtxt
 192         let r = tls::with_related_context(tcx, move |current_icx| {
 193             // Update the ImplicitCtxt to point to our new query job
 194             let new_icx = tls::ImplicitCtxt {
 195                 tcx,
 196                 query: Some(self.job.clone()),
 197                 layout_depth: current_icx.layout_depth,
 198                 task: current_icx.task,
 199             };
 200
 201             // Use the ImplicitCtxt while we execute the query
 202             tls::enter_context(&new_icx, |_| {
 203                 compute(tcx)
 204             })
 205         });
 206
 207         // Extract the diagnostic from the job
 208         let diagnostics = mem::replace(&mut *self.job.diagnostics.lock(), Vec::new());
 209
 210         (r, diagnostics)
 211     }
 212 }
 213
 214 impl<'a, 'tcx, Q: QueryDescription<'tcx>> Drop for JobOwner<'a, 'tcx, Q> {
 215     fn drop(&mut self) {
 216         // Poison the query so jobs waiting on it panic
 217         self.cache.borrow_mut().active.insert(self.key.clone(), QueryResult::Poisoned);
 218         // Also signal the completion of the job, so waiters
 219         // will continue execution
 220         self.job.signal_complete();
 221     }
 222 }
 223
 224 #[derive(Clone)]
 225 pub struct CycleError<'tcx> {
 226     /// The query and related span which uses the cycle
 227     pub(super) usage: Option<(Span, Query<'tcx>)>,
 228     pub(super) cycle: Vec<QueryInfo<'tcx>>,
 229 }
 230
 231 /// The result of `try_get_lock`
 232 pub(super) enum TryGetJob<'a, 'tcx: 'a, D: QueryDescription<'tcx> + 'a> {
 233     /// The query is not yet started. Contains a guard to the cache eventually used to start it.
 234     NotYetStarted(JobOwner<'a, 'tcx, D>),
 235
 236     /// The query was already completed.
 237     /// Returns the result of the query and its dep node index
 238     /// if it succeeded or a cycle error if it failed
 239     JobCompleted(Result<(D::Value, DepNodeIndex), CycleError<'tcx>>),
 240 }
 241
 242 impl<'a, 'gcx, 'tcx> TyCtxt<'a, 'gcx, 'tcx> {
 243     pub(super) fn report_cycle(self, CycleError { usage, cycle: stack }: CycleError<'gcx>)
 244         -> DiagnosticBuilder<'a>
 245     {
 246         assert!(!stack.is_empty());
 247
 248         let fix_span = |span: Span, query: &Query<'gcx>| {
 249             self.sess.codemap().def_span(query.default_span(self, span))
 250         };
 251
 252         // Disable naming impls with types in this path, since that
 253         // sometimes cycles itself, leading to extra cycle errors.
 254         // (And cycle errors around impls tend to occur during the
 255         // collect/coherence phases anyhow.)
 256         item_path::with_forced_impl_filename_line(|| {
 257             let span = fix_span(stack[1 % stack.len()].span, &stack[0].query);
 258             let mut err = struct_span_err!(self.sess,
 259                                            span,
 260                                            E0391,
 261                                            "cycle detected when {}",
 262                                            stack[0].query.describe(self));
 263
 264             for i in 1..stack.len() {
 265                 let query = &stack[i].query;
 266                 let span = fix_span(stack[(i + 1) % stack.len()].span, query);
 267                 err.span_note(span, &format!("...which requires {}...", query.describe(self)));
 268             }
 269
 270             err.note(&format!("...which again requires {}, completing the cycle",
 271                               stack[0].query.describe(self)));
 272
 273             if let Some((span, query)) = usage {
 274                 err.span_note(fix_span(span, &query),
 275                               &format!("cycle used when {}", query.describe(self)));
 276             }
 277
 278             return err
 279         })
 280     }
 281
 282     pub fn try_print_query_stack() {
 283         eprintln!("query stack during panic:");
 284
 285         tls::with_context_opt(|icx| {
 286             if let Some(icx) = icx {
 287                 let mut current_query = icx.query.clone();
 288                 let mut i = 0;
 289
 290                 while let Some(query) = current_query {
 291                     let mut db = DiagnosticBuilder::new(icx.tcx.sess.diagnostic(),
 292                         Level::FailureNote,
 293                         &format!("#{} [{}] {}",
 294                                  i,
 295                                  query.info.query.name(),
 296                                  query.info.query.describe(icx.tcx)));
 297                     db.set_span(icx.tcx.sess.codemap().def_span(query.info.span));
 298                     icx.tcx.sess.diagnostic().force_print_db(db);
 299
 300                     current_query = query.parent.clone();
 301                     i += 1;
 302                 }
 303             }
 304         });
 305
 306         eprintln!("end of query stack");
 307     }
 308
 309     /// Try to read a node index for the node dep_node.
 310     /// A node will have an index, when it's already been marked green, or when we can mark it
 311     /// green. This function will mark the current task as a reader of the specified node, when
 312     /// the a node index can be found for that node.
 313     pub(super) fn try_mark_green_and_read(self, dep_node: &DepNode) -> Option<DepNodeIndex> {
 314         match self.dep_graph.node_color(dep_node) {
 315             Some(DepNodeColor::Green(dep_node_index)) => {
 316                 self.dep_graph.read_index(dep_node_index);
 317                 Some(dep_node_index)
 318             }
 319             Some(DepNodeColor::Red) => {
 320                 None
 321             }
 322             None => {
 323                 // try_mark_green (called below) will panic when full incremental
 324                 // compilation is disabled. If that's the case, we can't try to mark nodes
 325                 // as green anyway, so we can safely return None here.
 326                 if !self.dep_graph.is_fully_enabled() {
 327                     return None;
 328                 }
 329                 match self.dep_graph.try_mark_green(self.global_tcx(), &dep_node) {
 330                     Some(dep_node_index) => {
 331                         debug_assert!(self.dep_graph.is_green(&dep_node));
 332                         self.dep_graph.read_index(dep_node_index);
 333                         Some(dep_node_index)
 334                     }
 335                     None => {
 336                         None
 337                     }
 338                 }
 339             }
 340         }
 341     }
 342
 343     fn try_get_with<Q: QueryDescription<'gcx>>(
 344         self,
 345         span: Span,
 346         key: Q::Key)
 347     -> Result<Q::Value, CycleError<'gcx>>
 348     {
 349         debug!("ty::queries::{}::try_get_with(key={:?}, span={:?})",
 350                Q::NAME,
 351                key,
 352                span);
 353
 354         profq_msg!(self,
 355             ProfileQueriesMsg::QueryBegin(
 356                 span.data(),
 357                 profq_query_msg!(Q::NAME, self, key),
 358             )
 359         );
 360
 361         let job = match JobOwner::try_get(self, span, &key) {
 362             TryGetJob::NotYetStarted(job) => job,
 363             TryGetJob::JobCompleted(result) => {
 364                 return result.map(|(v, index)| {
 365                     self.dep_graph.read_index(index);
 366                     v
 367                 })
 368             }
 369         };
 370
 371         // Fast path for when incr. comp. is off. `to_dep_node` is
 372         // expensive for some DepKinds.
 373         if !self.dep_graph.is_fully_enabled() {
 374             let null_dep_node = DepNode::new_no_params(::dep_graph::DepKind::Null);
 375             return self.force_query_with_job::<Q>(key, job, null_dep_node).map(|(v, _)| v);
 376         }
 377
 378         let dep_node = Q::to_dep_node(self, &key);
 379
 380         if dep_node.kind.is_anon() {
 381             profq_msg!(self, ProfileQueriesMsg::ProviderBegin);
 382
 383             let res = job.start(self, |tcx| {
 384                 tcx.dep_graph.with_anon_task(dep_node.kind, || {
 385                     Q::compute(tcx.global_tcx(), key)
 386                 })
 387             });
 388
 389             profq_msg!(self, ProfileQueriesMsg::ProviderEnd);
 390             let ((result, dep_node_index), diagnostics) = res;
 391
 392             self.dep_graph.read_index(dep_node_index);
 393
 394             self.queries.on_disk_cache
 395                 .store_diagnostics_for_anon_node(dep_node_index, diagnostics);
 396
 397             job.complete(&result, dep_node_index);
 398
 399             return Ok(result);
 400         }
 401
 402         if !dep_node.kind.is_input() {
 403             if let Some(dep_node_index) = self.try_mark_green_and_read(&dep_node) {
 404                 profq_msg!(self, ProfileQueriesMsg::CacheHit);
 405                 return self.load_from_disk_and_cache_in_memory::<Q>(key,
 406                                                                     job,
 407                                                                     dep_node_index,
 408                                                                     &dep_node)
 409             }
 410         }
 411
 412         match self.force_query_with_job::<Q>(key, job, dep_node) {
 413             Ok((result, dep_node_index)) => {
 414                 self.dep_graph.read_index(dep_node_index);
 415                 Ok(result)
 416             }
 417             Err(e) => Err(e)
 418         }
 419     }
 420
 421     fn load_from_disk_and_cache_in_memory<Q: QueryDescription<'gcx>>(
 422         self,
 423         key: Q::Key,
 424         job: JobOwner<'a, 'gcx, Q>,
 425         dep_node_index: DepNodeIndex,
 426         dep_node: &DepNode
 427     ) -> Result<Q::Value, CycleError<'gcx>>
 428     {
 429         // Note this function can be called concurrently from the same query
 430         // We must ensure that this is handled correctly
 431
 432         debug_assert!(self.dep_graph.is_green(dep_node));
 433
 434         // First we try to load the result from the on-disk cache
 435         let result = if Q::cache_on_disk(key.clone()) &&
 436                         self.sess.opts.debugging_opts.incremental_queries {
 437             let prev_dep_node_index =
 438                 self.dep_graph.prev_dep_node_index_of(dep_node);
 439             let result = Q::try_load_from_disk(self.global_tcx(),
 440                                                     prev_dep_node_index);
 441
 442             // We always expect to find a cached result for things that
 443             // can be forced from DepNode.
 444             debug_assert!(!dep_node.kind.can_reconstruct_query_key() ||
 445                             result.is_some(),
 446                             "Missing on-disk cache entry for {:?}",
 447                             dep_node);
 448             result
 449         } else {
 450             // Some things are never cached on disk.
 451             None
 452         };
 453
 454         let result = if let Some(result) = result {
 455             result
 456         } else {
 457             // We could not load a result from the on-disk cache, so
 458             // recompute.
 459
 460             // The diagnostics for this query have already been
 461             // promoted to the current session during
 462             // try_mark_green(), so we can ignore them here.
 463             let (result, _) = job.start(self, |tcx| {
 464                 // The dep-graph for this computation is already in
 465                 // place
 466                 tcx.dep_graph.with_ignore(|| {
 467                     Q::compute(tcx, key)
 468                 })
 469             });
 470             result
 471         };
 472
 473         // If -Zincremental-verify-ich is specified, re-hash results from
 474         // the cache and make sure that they have the expected fingerprint.
 475         if self.sess.opts.debugging_opts.incremental_verify_ich {
 476             use rustc_data_structures::stable_hasher::{StableHasher, HashStable};
 477             use ich::Fingerprint;
 478
 479             assert!(Some(self.dep_graph.fingerprint_of(dep_node_index)) ==
 480                     self.dep_graph.prev_fingerprint_of(dep_node),
 481                     "Fingerprint for green query instance not loaded \
 482                         from cache: {:?}", dep_node);
 483
 484             debug!("BEGIN verify_ich({:?})", dep_node);
 485             let mut hcx = self.create_stable_hashing_context();
 486             let mut hasher = StableHasher::new();
 487
 488             result.hash_stable(&mut hcx, &mut hasher);
 489
 490             let new_hash: Fingerprint = hasher.finish();
 491             debug!("END verify_ich({:?})", dep_node);
 492
 493             let old_hash = self.dep_graph.fingerprint_of(dep_node_index);
 494
 495             assert!(new_hash == old_hash, "Found unstable fingerprints \
 496                 for {:?}", dep_node);
 497         }
 498
 499         if self.sess.opts.debugging_opts.query_dep_graph {
 500             self.dep_graph.mark_loaded_from_cache(dep_node_index, true);
 501         }
 502
 503         job.complete(&result, dep_node_index);
 504
 505         Ok(result)
 506     }
 507
 508     fn force_query_with_job<Q: QueryDescription<'gcx>>(
 509         self,
 510         key: Q::Key,
 511         job: JobOwner<'_, 'gcx, Q>,
 512         dep_node: DepNode)
 513     -> Result<(Q::Value, DepNodeIndex), CycleError<'gcx>> {
 514         // If the following assertion triggers, it can have two reasons:
 515         // 1. Something is wrong with DepNode creation, either here or
 516         //    in DepGraph::try_mark_green()
 517         // 2. Two distinct query keys get mapped to the same DepNode
 518         //    (see for example #48923)
 519         assert!(!self.dep_graph.dep_node_exists(&dep_node),
 520                 "Forcing query with already existing DepNode.\n\
 521                     - query-key: {:?}\n\
 522                     - dep-node: {:?}",
 523                 key, dep_node);
 524
 525         profq_msg!(self, ProfileQueriesMsg::ProviderBegin);
 526         let res = job.start(self, |tcx| {
 527             if dep_node.kind.is_eval_always() {
 528                 tcx.dep_graph.with_eval_always_task(dep_node,
 529                                                     tcx,
 530                                                     key,
 531                                                     Q::compute)
 532             } else {
 533                 tcx.dep_graph.with_task(dep_node,
 534                                         tcx,
 535                                         key,
 536                                         Q::compute)
 537             }
 538         });
 539         profq_msg!(self, ProfileQueriesMsg::ProviderEnd);
 540
 541         let ((result, dep_node_index), diagnostics) = res;
 542
 543         if self.sess.opts.debugging_opts.query_dep_graph {
 544             self.dep_graph.mark_loaded_from_cache(dep_node_index, false);
 545         }
 546
 547         if dep_node.kind != ::dep_graph::DepKind::Null {
 548             self.queries.on_disk_cache
 549                 .store_diagnostics(dep_node_index, diagnostics);
 550         }
 551
 552         job.complete(&result, dep_node_index);
 553
 554         Ok((result, dep_node_index))
 555     }
 556
 557     /// Ensure that either this query has all green inputs or been executed.
 558     /// Executing query::ensure(D) is considered a read of the dep-node D.
 559     ///
 560     /// This function is particularly useful when executing passes for their
 561     /// side-effects -- e.g., in order to report errors for erroneous programs.
 562     ///
 563     /// Note: The optimization is only available during incr. comp.
 564     pub(super) fn ensure_query<Q: QueryDescription<'gcx>>(self, key: Q::Key) -> () {
 565         let dep_node = Q::to_dep_node(self, &key);
 566
 567         // Ensuring an "input" or anonymous query makes no sense
 568         assert!(!dep_node.kind.is_anon());
 569         assert!(!dep_node.kind.is_input());
 570         if self.try_mark_green_and_read(&dep_node).is_none() {
 571             // A None return from `try_mark_green_and_read` means that this is either
 572             // a new dep node or that the dep node has already been marked red.
 573             // Either way, we can't call `dep_graph.read()` as we don't have the
 574             // DepNodeIndex. We must invoke the query itself. The performance cost
 575             // this introduces should be negligible as we'll immediately hit the
 576             // in-memory cache, or another query down the line will.
 577             let _ = self.get_query::<Q>(DUMMY_SP, key);
 578         }
 579     }
 580
 581     #[allow(dead_code)]
 582     fn force_query<Q: QueryDescription<'gcx>>(
 583         self,
 584         key: Q::Key,
 585         span: Span,
 586         dep_node: DepNode
 587     ) -> Result<(Q::Value, DepNodeIndex), CycleError<'gcx>> {
 588         // We may be concurrently trying both execute and force a query
 589         // Ensure that only one of them runs the query
 590         let job = match JobOwner::try_get(self, span, &key) {
 591             TryGetJob::NotYetStarted(job) => job,
 592             TryGetJob::JobCompleted(result) => return result,
 593         };
 594         self.force_query_with_job::<Q>(key, job, dep_node)
 595     }
 596
 597     pub(super) fn try_get_query<Q: QueryDescription<'gcx>>(
 598         self,
 599         span: Span,
 600         key: Q::Key,
 601     ) -> Result<Q::Value, DiagnosticBuilder<'a>> {
 602         match self.try_get_with::<Q>(span, key) {
 603             Ok(e) => Ok(e),
 604             Err(e) => Err(self.report_cycle(e)),
 605         }
 606     }
 607
 608     pub(super) fn get_query<Q: QueryDescription<'gcx>>(
 609         self,
 610         span: Span,
 611         key: Q::Key,
 612     ) -> Q::Value {
 613         self.try_get_query::<Q>(span, key).unwrap_or_else(|mut e| {
 614             e.emit();
 615             Q::handle_cycle_error(self)
 616         })
 617     }
 618 }
 619
 620 macro_rules! handle_cycle_error {
 621     ([][$this: expr]) => {{
 622         Value::from_cycle_error($this.global_tcx())
 623     }};
 624     ([fatal_cycle$(, $modifiers:ident)*][$this:expr]) => {{
 625         $this.sess.abort_if_errors();
 626         unreachable!();
 627     }};
 628     ([$other:ident$(, $modifiers:ident)*][$($args:tt)*]) => {
 629         handle_cycle_error!([$($modifiers),*][$($args)*])
 630     };
 631 }
 632
 633 macro_rules! define_queries {
 634     (<$tcx:tt>
 635      $($(#[$attr:meta])*
 636        [$($modifiers:tt)*] fn $name:ident: $node:ident($K:ty) -> $V:ty,)*) => {
 637
 638         use std::mem;
 639         #[cfg(parallel_queries)]
 640         use ty::query::job::QueryResult;
 641         use rustc_data_structures::sync::Lock;
 642         use {
 643             rustc_data_structures::stable_hasher::HashStable,
 644             rustc_data_structures::stable_hasher::StableHasherResult,
 645             rustc_data_structures::stable_hasher::StableHasher,
 646             ich::StableHashingContext
 647         };
 648
 649         define_queries_struct! {
 650             tcx: $tcx,
 651             input: ($(([$($modifiers)*] [$($attr)*] [$name]))*)
 652         }
 653
 654         impl<$tcx> Queries<$tcx> {
 655             pub fn new(
 656                 providers: IndexVec<CrateNum, Providers<$tcx>>,
 657                 on_disk_cache: OnDiskCache<'tcx>,
 658             ) -> Self {
 659                 Queries {
 660                     providers,
 661                     on_disk_cache,
 662                     $($name: Lock::new(QueryCache::new())),*
 663                 }
 664             }
 665
 666             #[cfg(parallel_queries)]
 667             pub fn collect_active_jobs(&self) -> Vec<Lrc<QueryJob<$tcx>>> {
 668                 let mut jobs = Vec::new();
 669
 670                 // We use try_lock here since we are only called from the
 671                 // deadlock handler, and this shouldn't be locked
 672                 $(for v in self.$name.try_lock().unwrap().active.values() {
 673                     match *v {
 674                         QueryResult::Started(ref job) => jobs.push(job.clone()),
 675                         _ => (),
 676                     }
 677                 })*
 678
 679                 return jobs;
 680             }
 681         }
 682
 683         #[allow(bad_style)]
 684         #[derive(Copy, Clone, Debug, PartialEq, Eq, Hash)]
 685         pub enum Query<$tcx> {
 686             $($(#[$attr])* $name($K)),*
 687         }
 688
 689         impl<$tcx> Query<$tcx> {
 690             pub fn name(&self) -> &'static str {
 691                 match *self {
 692                     $(Query::$name(_) => stringify!($name),)*
 693                 }
 694             }
 695
 696             pub fn describe(&self, tcx: TyCtxt) -> String {
 697                 let (r, name) = match *self {
 698                     $(Query::$name(key) => {
 699                         (queries::$name::describe(tcx, key), stringify!($name))
 700                     })*
 701                 };
 702                 if tcx.sess.verbose() {
 703                     format!("{} [{}]", r, name)
 704                 } else {
 705                     r
 706                 }
 707             }
 708
 709             // FIXME(eddyb) Get more valid Span's on queries.
 710             pub fn default_span(&self, tcx: TyCtxt<'_, $tcx, '_>, span: Span) -> Span {
 711                 if !span.is_dummy() {
 712                     return span;
 713                 }
 714                 // The def_span query is used to calculate default_span,
 715                 // so exit to avoid infinite recursion
 716                 match *self {
 717                     Query::def_span(..) => return span,
 718                     _ => ()
 719                 }
 720                 match *self {
 721                     $(Query::$name(key) => key.default_span(tcx),)*
 722                 }
 723             }
 724         }
 725
 726         impl<'a, $tcx> HashStable<StableHashingContext<'a>> for Query<$tcx> {
 727             fn hash_stable<W: StableHasherResult>(&self,
 728                                                 hcx: &mut StableHashingContext<'a>,
 729                                                 hasher: &mut StableHasher<W>) {
 730                 mem::discriminant(self).hash_stable(hcx, hasher);
 731                 match *self {
 732                     $(Query::$name(key) => key.hash_stable(hcx, hasher),)*
 733                 }
 734             }
 735         }
 736
 737         pub mod queries {
 738             use std::marker::PhantomData;
 739
 740             $(#[allow(bad_style)]
 741             pub struct $name<$tcx> {
 742                 data: PhantomData<&$tcx ()>
 743             })*
 744         }
 745
 746         // This module and the functions in it exist only to provide a
 747         // predictable symbol name prefix for query providers. This is helpful
 748         // for analyzing queries in profilers.
 749         pub(super) mod __query_compute {
 750             $(#[inline(never)]
 751             pub fn $name<F: FnOnce() -> R, R>(f: F) -> R {
 752                 f()
 753             })*
 754         }
 755
 756         $(impl<$tcx> QueryConfig<$tcx> for queries::$name<$tcx> {
 757             type Key = $K;
 758             type Value = $V;
 759
 760             const NAME: &'static str = stringify!($name);
 761         }
 762
 763         impl<$tcx> QueryAccessors<$tcx> for queries::$name<$tcx> {
 764             fn query(key: Self::Key) -> Query<'tcx> {
 765                 Query::$name(key)
 766             }
 767
 768             fn query_cache<'a>(tcx: TyCtxt<'a, $tcx, '_>) -> &'a Lock<QueryCache<$tcx, Self>> {
 769                 &tcx.queries.$name
 770             }
 771
 772             #[allow(unused)]
 773             fn to_dep_node(tcx: TyCtxt<'_, $tcx, '_>, key: &Self::Key) -> DepNode {
 774                 use dep_graph::DepConstructor::*;
 775
 776                 DepNode::new(tcx, $node(*key))
 777             }
 778
 779             #[inline]
 780             fn compute(tcx: TyCtxt<'_, 'tcx, '_>, key: Self::Key) -> Self::Value {
 781                 __query_compute::$name(move || {
 782                     let provider = tcx.queries.providers[key.query_crate()].$name;
 783                     provider(tcx.global_tcx(), key)
 784                 })
 785             }
 786
 787             fn handle_cycle_error(tcx: TyCtxt<'_, 'tcx, '_>) -> Self::Value {
 788                 handle_cycle_error!([$($modifiers)*][tcx])
 789             }
 790         }
 791
 792         impl<'a, $tcx, 'lcx> queries::$name<$tcx> {
 793             /// Ensure that either this query has all green inputs or been executed.
 794             /// Executing query::ensure(D) is considered a read of the dep-node D.
 795             ///
 796             /// This function is particularly useful when executing passes for their
 797             /// side-effects -- e.g., in order to report errors for erroneous programs.
 798             ///
 799             /// Note: The optimization is only available during incr. comp.
 800             pub fn ensure(tcx: TyCtxt<'a, $tcx, 'lcx>, key: $K) -> () {
 801                 tcx.ensure_query::<queries::$name>(key);
 802             }
 803         })*
 804
 805         #[derive(Copy, Clone)]
 806         pub struct TyCtxtAt<'a, 'gcx: 'a+'tcx, 'tcx: 'a> {
 807             pub tcx: TyCtxt<'a, 'gcx, 'tcx>,
 808             pub span: Span,
 809         }
 810
 811         impl<'a, 'gcx, 'tcx> Deref for TyCtxtAt<'a, 'gcx, 'tcx> {
 812             type Target = TyCtxt<'a, 'gcx, 'tcx>;
 813             fn deref(&self) -> &Self::Target {
 814                 &self.tcx
 815             }
 816         }
 817
 818         impl<'a, $tcx, 'lcx> TyCtxt<'a, $tcx, 'lcx> {
 819             /// Return a transparent wrapper for `TyCtxt` which uses
 820             /// `span` as the location of queries performed through it.
 821             pub fn at(self, span: Span) -> TyCtxtAt<'a, $tcx, 'lcx> {
 822                 TyCtxtAt {
 823                     tcx: self,
 824                     span
 825                 }
 826             }
 827
 828             $($(#[$attr])*
 829             pub fn $name(self, key: $K) -> $V {
 830                 self.at(DUMMY_SP).$name(key)
 831             })*
 832         }
 833
 834         impl<'a, $tcx, 'lcx> TyCtxtAt<'a, $tcx, 'lcx> {
 835             $($(#[$attr])*
 836             pub fn $name(self, key: $K) -> $V {
 837                 self.tcx.get_query::<queries::$name>(self.span, key)
 838             })*
 839         }
 840
 841         define_provider_struct! {
 842             tcx: $tcx,
 843             input: ($(([$($modifiers)*] [$name] [$K] [$V]))*)
 844         }
 845
 846         impl<$tcx> Copy for Providers<$tcx> {}
 847         impl<$tcx> Clone for Providers<$tcx> {
 848             fn clone(&self) -> Self { *self }
 849         }
 850     }
 851 }
 852
 853 macro_rules! define_queries_struct {
 854     (tcx: $tcx:tt,
 855      input: ($(([$($modifiers:tt)*] [$($attr:tt)*] [$name:ident]))*)) => {
 856         pub(crate) struct Queries<$tcx> {
 857             /// This provides access to the incr. comp. on-disk cache for query results.
 858             /// Do not access this directly. It is only meant to be used by
 859             /// `DepGraph::try_mark_green()` and the query infrastructure.
 860             pub(crate) on_disk_cache: OnDiskCache<'tcx>,
 861
 862             providers: IndexVec<CrateNum, Providers<$tcx>>,
 863
 864             $($(#[$attr])*  $name: Lock<QueryCache<$tcx, queries::$name<$tcx>>>,)*
 865         }
 866     };
 867 }
 868
 869 macro_rules! define_provider_struct {
 870     (tcx: $tcx:tt,
 871      input: ($(([$($modifiers:tt)*] [$name:ident] [$K:ty] [$R:ty]))*)) => {
 872         pub struct Providers<$tcx> {
 873             $(pub $name: for<'a> fn(TyCtxt<'a, $tcx, $tcx>, $K) -> $R,)*
 874         }
 875
 876         impl<$tcx> Default for Providers<$tcx> {
 877             fn default() -> Self {
 878                 $(fn $name<'a, $tcx>(_: TyCtxt<'a, $tcx, $tcx>, key: $K) -> $R {
 879                     bug!("tcx.{}({:?}) unsupported by its crate",
 880                          stringify!($name), key);
 881                 })*
 882                 Providers { $($name),* }
 883             }
 884         }
 885     };
 886 }
 887
 888
 889 /// The red/green evaluation system will try to mark a specific DepNode in the
 890 /// dependency graph as green by recursively trying to mark the dependencies of
 891 /// that DepNode as green. While doing so, it will sometimes encounter a DepNode
 892 /// where we don't know if it is red or green and we therefore actually have
 893 /// to recompute its value in order to find out. Since the only piece of
 894 /// information that we have at that point is the DepNode we are trying to
 895 /// re-evaluate, we need some way to re-run a query from just that. This is what
 896 /// `force_from_dep_node()` implements.
 897 ///
 898 /// In the general case, a DepNode consists of a DepKind and an opaque
 899 /// GUID/fingerprint that will uniquely identify the node. This GUID/fingerprint
 900 /// is usually constructed by computing a stable hash of the query-key that the
 901 /// DepNode corresponds to. Consequently, it is not in general possible to go
 902 /// back from hash to query-key (since hash functions are not reversible). For
 903 /// this reason `force_from_dep_node()` is expected to fail from time to time
 904 /// because we just cannot find out, from the DepNode alone, what the
 905 /// corresponding query-key is and therefore cannot re-run the query.
 906 ///
 907 /// The system deals with this case letting `try_mark_green` fail which forces
 908 /// the root query to be re-evaluated.
 909 ///
 910 /// Now, if force_from_dep_node() would always fail, it would be pretty useless.
 911 /// Fortunately, we can use some contextual information that will allow us to
 912 /// reconstruct query-keys for certain kinds of DepNodes. In particular, we
 913 /// enforce by construction that the GUID/fingerprint of certain DepNodes is a
 914 /// valid DefPathHash. Since we also always build a huge table that maps every
 915 /// DefPathHash in the current codebase to the corresponding DefId, we have
 916 /// everything we need to re-run the query.
 917 ///
 918 /// Take the `mir_validated` query as an example. Like many other queries, it
 919 /// just has a single parameter: the DefId of the item it will compute the
 920 /// validated MIR for. Now, when we call `force_from_dep_node()` on a dep-node
 921 /// with kind `MirValidated`, we know that the GUID/fingerprint of the dep-node
 922 /// is actually a DefPathHash, and can therefore just look up the corresponding
 923 /// DefId in `tcx.def_path_hash_to_def_id`.
 924 ///
 925 /// When you implement a new query, it will likely have a corresponding new
 926 /// DepKind, and you'll have to support it here in `force_from_dep_node()`. As
 927 /// a rule of thumb, if your query takes a DefId or DefIndex as sole parameter,
 928 /// then `force_from_dep_node()` should not fail for it. Otherwise, you can just
 929 /// add it to the "We don't have enough information to reconstruct..." group in
 930 /// the match below.
 931 pub fn force_from_dep_node<'a, 'gcx, 'lcx>(tcx: TyCtxt<'a, 'gcx, 'lcx>,
 932                                            dep_node: &DepNode)
 933                                            -> bool {
 934     use hir::def_id::LOCAL_CRATE;
 935
 936     // We must avoid ever having to call force_from_dep_node() for a
 937     // DepNode::CodegenUnit:
 938     // Since we cannot reconstruct the query key of a DepNode::CodegenUnit, we
 939     // would always end up having to evaluate the first caller of the
 940     // `codegen_unit` query that *is* reconstructible. This might very well be
 941     // the `compile_codegen_unit` query, thus re-codegenning the whole CGU just
 942     // to re-trigger calling the `codegen_unit` query with the right key. At
 943     // that point we would already have re-done all the work we are trying to
 944     // avoid doing in the first place.
 945     // The solution is simple: Just explicitly call the `codegen_unit` query for
 946     // each CGU, right after partitioning. This way `try_mark_green` will always
 947     // hit the cache instead of having to go through `force_from_dep_node`.
 948     // This assertion makes sure, we actually keep applying the solution above.
 949     debug_assert!(dep_node.kind != DepKind::CodegenUnit,
 950                   "calling force_from_dep_node() on DepKind::CodegenUnit");
 951
 952     if !dep_node.kind.can_reconstruct_query_key() {
 953         return false
 954     }
 955
 956     macro_rules! def_id {
 957         () => {
 958             if let Some(def_id) = dep_node.extract_def_id(tcx) {
 959                 def_id
 960             } else {
 961                 // return from the whole function
 962                 return false
 963             }
 964         }
 965     };
 966
 967     macro_rules! krate {
 968         () => { (def_id!()).krate }
 969     };
 970
 971     macro_rules! force {
 972         ($query:ident, $key:expr) => {
 973             {
 974                 use $crate::util::common::{ProfileQueriesMsg, profq_msg};
 975
 976                 profq_msg!(tcx,
 977                     ProfileQueriesMsg::QueryBegin(
 978                         DUMMY_SP.data(),
 979                         profq_query_msg!(::ty::query::queries::$query::NAME, tcx, $key),
 980                     )
 981                 );
 982
 983                 match tcx.force_query::<::ty::query::queries::$query>($key, DUMMY_SP, *dep_node) {
 984                     Ok(_) => {},
 985                     Err(e) => {
 986                         tcx.report_cycle(e).emit();
 987                     }
 988                 }
 989             }
 990         }
 991     };
 992
 993     // FIXME(#45015): We should try move this boilerplate code into a macro
 994     //                somehow.
 995     match dep_node.kind {
 996         // These are inputs that are expected to be pre-allocated and that
 997         // should therefore always be red or green already
 998         DepKind::AllLocalTraitImpls |
 999         DepKind::Krate |
1000         DepKind::CrateMetadata |
1001         DepKind::HirBody |
1002         DepKind::Hir |
1003
1004         // This are anonymous nodes
1005         DepKind::TraitSelect |
1006
1007         // We don't have enough information to reconstruct the query key of
1008         // these
1009         DepKind::IsCopy |
1010         DepKind::IsSized |
1011         DepKind::IsFreeze |
1012         DepKind::NeedsDrop |
1013         DepKind::Layout |
1014         DepKind::ConstEval |
1015         DepKind::InstanceSymbolName |
1016         DepKind::MirShim |
1017         DepKind::BorrowCheckKrate |
1018         DepKind::Specializes |
1019         DepKind::ImplementationsOfTrait |
1020         DepKind::TypeParamPredicates |
1021         DepKind::CodegenUnit |
1022         DepKind::CompileCodegenUnit |
1023         DepKind::FulfillObligation |
1024         DepKind::VtableMethods |
1025         DepKind::EraseRegionsTy |
1026         DepKind::ConstValueToAllocation |
1027         DepKind::NormalizeProjectionTy |
1028         DepKind::NormalizeTyAfterErasingRegions |
1029         DepKind::DropckOutlives |
1030         DepKind::EvaluateObligation |
1031         DepKind::TypeOpEq |
1032         DepKind::TypeOpSubtype |
1033         DepKind::TypeOpProvePredicate |
1034         DepKind::TypeOpNormalizeTy |
1035         DepKind::TypeOpNormalizePredicate |
1036         DepKind::TypeOpNormalizePolyFnSig |
1037         DepKind::TypeOpNormalizeFnSig |
1038         DepKind::SubstituteNormalizeAndTestPredicates |
1039         DepKind::InstanceDefSizeEstimate |
1040         DepKind::ProgramClausesForEnv |
1041
1042         // This one should never occur in this context
1043         DepKind::Null => {
1044             bug!("force_from_dep_node() - Encountered {:?}", dep_node)
1045         }
1046
1047         // These are not queries
1048         DepKind::CoherenceCheckTrait |
1049         DepKind::ItemVarianceConstraints => {
1050             return false
1051         }
1052
1053         DepKind::RegionScopeTree => { force!(region_scope_tree, def_id!()); }
1054
1055         DepKind::Coherence => { force!(crate_inherent_impls, LOCAL_CRATE); }
1056         DepKind::CoherenceInherentImplOverlapCheck => {
1057             force!(crate_inherent_impls_overlap_check, LOCAL_CRATE)
1058         },
1059         DepKind::PrivacyAccessLevels => { force!(privacy_access_levels, LOCAL_CRATE); }
1060         DepKind::MirBuilt => { force!(mir_built, def_id!()); }
1061         DepKind::MirConstQualif => { force!(mir_const_qualif, def_id!()); }
1062         DepKind::MirConst => { force!(mir_const, def_id!()); }
1063         DepKind::MirValidated => { force!(mir_validated, def_id!()); }
1064         DepKind::MirOptimized => { force!(optimized_mir, def_id!()); }
1065
1066         DepKind::BorrowCheck => { force!(borrowck, def_id!()); }
1067         DepKind::MirBorrowCheck => { force!(mir_borrowck, def_id!()); }
1068         DepKind::UnsafetyCheckResult => { force!(unsafety_check_result, def_id!()); }
1069         DepKind::UnsafeDeriveOnReprPacked => { force!(unsafe_derive_on_repr_packed, def_id!()); }
1070         DepKind::Reachability => { force!(reachable_set, LOCAL_CRATE); }
1071         DepKind::MirKeys => { force!(mir_keys, LOCAL_CRATE); }
1072         DepKind::CrateVariances => { force!(crate_variances, LOCAL_CRATE); }
1073         DepKind::AssociatedItems => { force!(associated_item, def_id!()); }
1074         DepKind::TypeOfItem => { force!(type_of, def_id!()); }
1075         DepKind::GenericsOfItem => { force!(generics_of, def_id!()); }
1076         DepKind::PredicatesOfItem => { force!(predicates_of, def_id!()); }
1077         DepKind::ExplicitPredicatesOfItem => { force!(explicit_predicates_of, def_id!()); }
1078         DepKind::InferredOutlivesOf => { force!(inferred_outlives_of, def_id!()); }
1079         DepKind::InferredOutlivesCrate => { force!(inferred_outlives_crate, LOCAL_CRATE); }
1080         DepKind::SuperPredicatesOfItem => { force!(super_predicates_of, def_id!()); }
1081         DepKind::TraitDefOfItem => { force!(trait_def, def_id!()); }
1082         DepKind::AdtDefOfItem => { force!(adt_def, def_id!()); }
1083         DepKind::ImplTraitRef => { force!(impl_trait_ref, def_id!()); }
1084         DepKind::ImplPolarity => { force!(impl_polarity, def_id!()); }
1085         DepKind::FnSignature => { force!(fn_sig, def_id!()); }
1086         DepKind::CoerceUnsizedInfo => { force!(coerce_unsized_info, def_id!()); }
1087         DepKind::ItemVariances => { force!(variances_of, def_id!()); }
1088         DepKind::IsConstFn => { force!(is_const_fn, def_id!()); }
1089         DepKind::IsForeignItem => { force!(is_foreign_item, def_id!()); }
1090         DepKind::SizedConstraint => { force!(adt_sized_constraint, def_id!()); }
1091         DepKind::DtorckConstraint => { force!(adt_dtorck_constraint, def_id!()); }
1092         DepKind::AdtDestructor => { force!(adt_destructor, def_id!()); }
1093         DepKind::AssociatedItemDefIds => { force!(associated_item_def_ids, def_id!()); }
1094         DepKind::InherentImpls => { force!(inherent_impls, def_id!()); }
1095         DepKind::TypeckBodiesKrate => { force!(typeck_item_bodies, LOCAL_CRATE); }
1096         DepKind::TypeckTables => { force!(typeck_tables_of, def_id!()); }
1097         DepKind::UsedTraitImports => { force!(used_trait_imports, def_id!()); }
1098         DepKind::HasTypeckTables => { force!(has_typeck_tables, def_id!()); }
1099         DepKind::SymbolName => { force!(def_symbol_name, def_id!()); }
1100         DepKind::SpecializationGraph => { force!(specialization_graph_of, def_id!()); }
1101         DepKind::ObjectSafety => { force!(is_object_safe, def_id!()); }
1102         DepKind::TraitImpls => { force!(trait_impls_of, def_id!()); }
1103         DepKind::CheckMatch => { force!(check_match, def_id!()); }
1104
1105         DepKind::ParamEnv => { force!(param_env, def_id!()); }
1106         DepKind::DescribeDef => { force!(describe_def, def_id!()); }
1107         DepKind::DefSpan => { force!(def_span, def_id!()); }
1108         DepKind::LookupStability => { force!(lookup_stability, def_id!()); }
1109         DepKind::LookupDeprecationEntry => {
1110             force!(lookup_deprecation_entry, def_id!());
1111         }
1112         DepKind::ConstIsRvaluePromotableToStatic => {
1113             force!(const_is_rvalue_promotable_to_static, def_id!());
1114         }
1115         DepKind::RvaluePromotableMap => { force!(rvalue_promotable_map, def_id!()); }
1116         DepKind::ImplParent => { force!(impl_parent, def_id!()); }
1117         DepKind::TraitOfItem => { force!(trait_of_item, def_id!()); }
1118         DepKind::IsReachableNonGeneric => { force!(is_reachable_non_generic, def_id!()); }
1119         DepKind::IsUnreachableLocalDefinition => {
1120             force!(is_unreachable_local_definition, def_id!());
1121         }
1122         DepKind::IsMirAvailable => { force!(is_mir_available, def_id!()); }
1123         DepKind::ItemAttrs => { force!(item_attrs, def_id!()); }
1124         DepKind::CodegenFnAttrs => { force!(codegen_fn_attrs, def_id!()); }
1125         DepKind::FnArgNames => { force!(fn_arg_names, def_id!()); }
1126         DepKind::RenderedConst => { force!(rendered_const, def_id!()); }
1127         DepKind::DylibDepFormats => { force!(dylib_dependency_formats, krate!()); }
1128         DepKind::IsPanicRuntime => { force!(is_panic_runtime, krate!()); }
1129         DepKind::IsCompilerBuiltins => { force!(is_compiler_builtins, krate!()); }
1130         DepKind::HasGlobalAllocator => { force!(has_global_allocator, krate!()); }
1131         DepKind::ExternCrate => { force!(extern_crate, def_id!()); }
1132         DepKind::LintLevels => { force!(lint_levels, LOCAL_CRATE); }
1133         DepKind::InScopeTraits => { force!(in_scope_traits_map, def_id!().index); }
1134         DepKind::ModuleExports => { force!(module_exports, def_id!()); }
1135         DepKind::IsSanitizerRuntime => { force!(is_sanitizer_runtime, krate!()); }
1136         DepKind::IsProfilerRuntime => { force!(is_profiler_runtime, krate!()); }
1137         DepKind::GetPanicStrategy => { force!(panic_strategy, krate!()); }
1138         DepKind::IsNoBuiltins => { force!(is_no_builtins, krate!()); }
1139         DepKind::ImplDefaultness => { force!(impl_defaultness, def_id!()); }
1140         DepKind::CheckItemWellFormed => { force!(check_item_well_formed, def_id!()); }
1141         DepKind::CheckTraitItemWellFormed => { force!(check_trait_item_well_formed, def_id!()); }
1142         DepKind::CheckImplItemWellFormed => { force!(check_impl_item_well_formed, def_id!()); }
1143         DepKind::ReachableNonGenerics => { force!(reachable_non_generics, krate!()); }
1144         DepKind::NativeLibraries => { force!(native_libraries, krate!()); }
1145         DepKind::PluginRegistrarFn => { force!(plugin_registrar_fn, krate!()); }
1146         DepKind::DeriveRegistrarFn => { force!(derive_registrar_fn, krate!()); }
1147         DepKind::CrateDisambiguator => { force!(crate_disambiguator, krate!()); }
1148         DepKind::CrateHash => { force!(crate_hash, krate!()); }
1149         DepKind::OriginalCrateName => { force!(original_crate_name, krate!()); }
1150         DepKind::ExtraFileName => { force!(extra_filename, krate!()); }
1151
1152         DepKind::AllTraitImplementations => {
1153             force!(all_trait_implementations, krate!());
1154         }
1155
1156         DepKind::DllimportForeignItems => {
1157             force!(dllimport_foreign_items, krate!());
1158         }
1159         DepKind::IsDllimportForeignItem => {
1160             force!(is_dllimport_foreign_item, def_id!());
1161         }
1162         DepKind::IsStaticallyIncludedForeignItem => {
1163             force!(is_statically_included_foreign_item, def_id!());
1164         }
1165         DepKind::NativeLibraryKind => { force!(native_library_kind, def_id!()); }
1166         DepKind::LinkArgs => { force!(link_args, LOCAL_CRATE); }
1167
1168         DepKind::ResolveLifetimes => { force!(resolve_lifetimes, krate!()); }
1169         DepKind::NamedRegion => { force!(named_region_map, def_id!().index); }
1170         DepKind::IsLateBound => { force!(is_late_bound_map, def_id!().index); }
1171         DepKind::ObjectLifetimeDefaults => {
1172             force!(object_lifetime_defaults_map, def_id!().index);
1173         }
1174
1175         DepKind::Visibility => { force!(visibility, def_id!()); }
1176         DepKind::DepKind => { force!(dep_kind, krate!()); }
1177         DepKind::CrateName => { force!(crate_name, krate!()); }
1178         DepKind::ItemChildren => { force!(item_children, def_id!()); }
1179         DepKind::ExternModStmtCnum => { force!(extern_mod_stmt_cnum, def_id!()); }
1180         DepKind::GetLangItems => { force!(get_lang_items, LOCAL_CRATE); }
1181         DepKind::DefinedLangItems => { force!(defined_lang_items, krate!()); }
1182         DepKind::MissingLangItems => { force!(missing_lang_items, krate!()); }
1183         DepKind::VisibleParentMap => { force!(visible_parent_map, LOCAL_CRATE); }
1184         DepKind::MissingExternCrateItem => {
1185             force!(missing_extern_crate_item, krate!());
1186         }
1187         DepKind::UsedCrateSource => { force!(used_crate_source, krate!()); }
1188         DepKind::PostorderCnums => { force!(postorder_cnums, LOCAL_CRATE); }
1189
1190         DepKind::Freevars => { force!(freevars, def_id!()); }
1191         DepKind::MaybeUnusedTraitImport => {
1192             force!(maybe_unused_trait_import, def_id!());
1193         }
1194         DepKind::MaybeUnusedExternCrates => { force!(maybe_unused_extern_crates, LOCAL_CRATE); }
1195         DepKind::StabilityIndex => { force!(stability_index, LOCAL_CRATE); }
1196         DepKind::AllTraits => { force!(all_traits, LOCAL_CRATE); }
1197         DepKind::AllCrateNums => { force!(all_crate_nums, LOCAL_CRATE); }
1198         DepKind::ExportedSymbols => { force!(exported_symbols, krate!()); }
1199         DepKind::CollectAndPartitionMonoItems => {
1200             force!(collect_and_partition_mono_items, LOCAL_CRATE);
1201         }
1202         DepKind::IsCodegenedItem => { force!(is_codegened_item, def_id!()); }
1203         DepKind::OutputFilenames => { force!(output_filenames, LOCAL_CRATE); }
1204
1205         DepKind::TargetFeaturesWhitelist => { force!(target_features_whitelist, LOCAL_CRATE); }
1206
1207         DepKind::Features => { force!(features_query, LOCAL_CRATE); }
1208
1209         DepKind::ProgramClausesFor => { force!(program_clauses_for, def_id!()); }
1210         DepKind::WasmCustomSections => { force!(wasm_custom_sections, krate!()); }
1211         DepKind::WasmImportModuleMap => { force!(wasm_import_module_map, krate!()); }
1212         DepKind::ForeignModules => { force!(foreign_modules, krate!()); }
1213
1214         DepKind::UpstreamMonomorphizations => {
1215             force!(upstream_monomorphizations, krate!());
1216         }
1217         DepKind::UpstreamMonomorphizationsFor => {
1218             force!(upstream_monomorphizations_for, def_id!());
1219         }
1220     }
1221
1222     true
1223 }
1224
1225
1226 // FIXME(#45015): Another piece of boilerplate code that could be generated in
1227 //                a combined define_dep_nodes!()/define_queries!() macro.
1228 macro_rules! impl_load_from_cache {
1229     ($($dep_kind:ident => $query_name:ident,)*) => {
1230         impl DepNode {
1231             // Check whether the query invocation corresponding to the given
1232             // DepNode is eligible for on-disk-caching.
1233             pub fn cache_on_disk(&self, tcx: TyCtxt) -> bool {
1234                 use ty::query::queries;
1235                 use ty::query::QueryDescription;
1236
1237                 match self.kind {
1238                     $(DepKind::$dep_kind => {
1239                         let def_id = self.extract_def_id(tcx).unwrap();
1240                         queries::$query_name::cache_on_disk(def_id)
1241                     })*
1242                     _ => false
1243                 }
1244             }
1245
1246             // This is method will execute the query corresponding to the given
1247             // DepNode. It is only expected to work for DepNodes where the
1248             // above `cache_on_disk` methods returns true.
1249             // Also, as a sanity check, it expects that the corresponding query
1250             // invocation has been marked as green already.
1251             pub fn load_from_on_disk_cache(&self, tcx: TyCtxt) {
1252                 match self.kind {
1253                     $(DepKind::$dep_kind => {
1254                         debug_assert!(tcx.dep_graph
1255                                          .node_color(self)
1256                                          .map(|c| c.is_green())
1257                                          .unwrap_or(false));
1258
1259                         let def_id = self.extract_def_id(tcx).unwrap();
1260                         let _ = tcx.$query_name(def_id);
1261                     })*
1262                     _ => {
1263                         bug!()
1264                     }
1265                 }
1266             }
1267         }
1268     }
1269 }
1270
1271 impl_load_from_cache!(
1272     TypeckTables => typeck_tables_of,
1273     MirOptimized => optimized_mir,
1274     UnsafetyCheckResult => unsafety_check_result,
1275     BorrowCheck => borrowck,
1276     MirBorrowCheck => mir_borrowck,
1277     MirConstQualif => mir_const_qualif,
1278     SymbolName => def_symbol_name,
1279     ConstIsRvaluePromotableToStatic => const_is_rvalue_promotable_to_static,
1280     CheckMatch => check_match,
1281     TypeOfItem => type_of,
1282     GenericsOfItem => generics_of,
1283     PredicatesOfItem => predicates_of,
1284     UsedTraitImports => used_trait_imports,
1285     CodegenFnAttrs => codegen_fn_attrs,
1286     SpecializationGraph => specialization_graph_of,
1287 );