src/librustc_middle/dep_graph/mod.rs

   1 use crate::ich::StableHashingContext;
   2 use crate::ty::query::try_load_from_on_disk_cache;
   3 use crate::ty::{self, TyCtxt};
   4 use rustc_data_structures::profiling::SelfProfilerRef;
   5 use rustc_data_structures::sync::Lock;
   6 use rustc_data_structures::thin_vec::ThinVec;
   7 use rustc_errors::Diagnostic;
   8 use rustc_hir::def_id::LocalDefId;
   9
  10 mod dep_node;
  11
  12 pub(crate) use rustc_query_system::dep_graph::DepNodeParams;
  13 pub use rustc_query_system::dep_graph::{
  14     debug, hash_result, DepContext, DepNodeColor, DepNodeIndex, SerializedDepNodeIndex,
  15     WorkProduct, WorkProductId,
  16 };
  17
  18 pub use dep_node::{label_strs, DepConstructor, DepKind, DepNode, DepNodeExt};
  19
  20 pub type DepGraph = rustc_query_system::dep_graph::DepGraph<DepKind>;
  21 pub type TaskDeps = rustc_query_system::dep_graph::TaskDeps<DepKind>;
  22 pub type DepGraphQuery = rustc_query_system::dep_graph::DepGraphQuery<DepKind>;
  23 pub type PreviousDepGraph = rustc_query_system::dep_graph::PreviousDepGraph<DepKind>;
  24 pub type SerializedDepGraph = rustc_query_system::dep_graph::SerializedDepGraph<DepKind>;
  25
  26 impl rustc_query_system::dep_graph::DepKind for DepKind {
  27     const NULL: Self = DepKind::Null;
  28
  29     fn is_eval_always(&self) -> bool {
  30         DepKind::is_eval_always(self)
  31     }
  32
  33     fn has_params(&self) -> bool {
  34         DepKind::has_params(self)
  35     }
  36
  37     fn debug_node(node: &DepNode, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
  38         write!(f, "{:?}", node.kind)?;
  39
  40         if !node.kind.has_params() && !node.kind.is_anon() {
  41             return Ok(());
  42         }
  43
  44         write!(f, "(")?;
  45
  46         ty::tls::with_opt(|opt_tcx| {
  47             if let Some(tcx) = opt_tcx {
  48                 if let Some(def_id) = node.extract_def_id(tcx) {
  49                     write!(f, "{}", tcx.def_path_debug_str(def_id))?;
  50                 } else if let Some(ref s) = tcx.dep_graph.dep_node_debug_str(*node) {
  51                     write!(f, "{}", s)?;
  52                 } else {
  53                     write!(f, "{}", node.hash)?;
  54                 }
  55             } else {
  56                 write!(f, "{}", node.hash)?;
  57             }
  58             Ok(())
  59         })?;
  60
  61         write!(f, ")")
  62     }
  63
  64     fn with_deps<OP, R>(task_deps: Option<&Lock<TaskDeps>>, op: OP) -> R
  65     where
  66         OP: FnOnce() -> R,
  67     {
  68         ty::tls::with_context(|icx| {
  69             let icx = ty::tls::ImplicitCtxt { task_deps, ..icx.clone() };
  70
  71             ty::tls::enter_context(&icx, |_| op())
  72         })
  73     }
  74
  75     fn read_deps<OP>(op: OP)
  76     where
  77         OP: for<'a> FnOnce(Option<&'a Lock<TaskDeps>>),
  78     {
  79         ty::tls::with_context_opt(|icx| {
  80             let icx = if let Some(icx) = icx { icx } else { return };
  81             op(icx.task_deps)
  82         })
  83     }
  84
  85     fn can_reconstruct_query_key(&self) -> bool {
  86         DepKind::can_reconstruct_query_key(self)
  87     }
  88 }
  89
  90 impl<'tcx> DepContext for TyCtxt<'tcx> {
  91     type DepKind = DepKind;
  92     type StableHashingContext = StableHashingContext<'tcx>;
  93
  94     fn create_stable_hashing_context(&self) -> Self::StableHashingContext {
  95         TyCtxt::create_stable_hashing_context(*self)
  96     }
  97
  98     fn debug_dep_tasks(&self) -> bool {
  99         self.sess.opts.debugging_opts.dep_tasks
 100     }
 101     fn debug_dep_node(&self) -> bool {
 102         self.sess.opts.debugging_opts.incremental_info
 103             || self.sess.opts.debugging_opts.query_dep_graph
 104     }
 105
 106     fn try_force_from_dep_node(&self, dep_node: &DepNode) -> bool {
 107         // FIXME: This match is just a workaround for incremental bugs and should
 108         // be removed. https://github.com/rust-lang/rust/issues/62649 is one such
 109         // bug that must be fixed before removing this.
 110         match dep_node.kind {
 111             DepKind::hir_owner | DepKind::hir_owner_nodes | DepKind::CrateMetadata => {
 112                 if let Some(def_id) = dep_node.extract_def_id(*self) {
 113                     if def_id_corresponds_to_hir_dep_node(*self, def_id.expect_local()) {
 114                         if dep_node.kind == DepKind::CrateMetadata {
 115                             // The `DefPath` has corresponding node,
 116                             // and that node should have been marked
 117                             // either red or green in `data.colors`.
 118                             bug!(
 119                                 "DepNode {:?} should have been \
 120                              pre-marked as red or green but wasn't.",
 121                                 dep_node
 122                             );
 123                         }
 124                     } else {
 125                         // This `DefPath` does not have a
 126                         // corresponding `DepNode` (e.g. a
 127                         // struct field), and the ` DefPath`
 128                         // collided with the `DefPath` of a
 129                         // proper item that existed in the
 130                         // previous compilation session.
 131                         //
 132                         // Since the given `DefPath` does not
 133                         // denote the item that previously
 134                         // existed, we just fail to mark green.
 135                         return false;
 136                     }
 137                 } else {
 138                     // If the node does not exist anymore, we
 139                     // just fail to mark green.
 140                     return false;
 141                 }
 142             }
 143             _ => {
 144                 // For other kinds of nodes it's OK to be
 145                 // forced.
 146             }
 147         }
 148
 149         debug!("try_force_from_dep_node({:?}) --- trying to force", dep_node);
 150         ty::query::force_from_dep_node(*self, dep_node)
 151     }
 152
 153     fn has_errors_or_delayed_span_bugs(&self) -> bool {
 154         self.sess.has_errors_or_delayed_span_bugs()
 155     }
 156
 157     fn diagnostic(&self) -> &rustc_errors::Handler {
 158         self.sess.diagnostic()
 159     }
 160
 161     // Interactions with on_disk_cache
 162     fn try_load_from_on_disk_cache(&self, dep_node: &DepNode) {
 163         try_load_from_on_disk_cache(*self, dep_node)
 164     }
 165
 166     fn load_diagnostics(&self, prev_dep_node_index: SerializedDepNodeIndex) -> Vec<Diagnostic> {
 167         self.queries.on_disk_cache.load_diagnostics(*self, prev_dep_node_index)
 168     }
 169
 170     fn store_diagnostics(&self, dep_node_index: DepNodeIndex, diagnostics: ThinVec<Diagnostic>) {
 171         self.queries.on_disk_cache.store_diagnostics(dep_node_index, diagnostics)
 172     }
 173
 174     fn store_diagnostics_for_anon_node(
 175         &self,
 176         dep_node_index: DepNodeIndex,
 177         diagnostics: ThinVec<Diagnostic>,
 178     ) {
 179         self.queries.on_disk_cache.store_diagnostics_for_anon_node(dep_node_index, diagnostics)
 180     }
 181
 182     fn profiler(&self) -> &SelfProfilerRef {
 183         &self.prof
 184     }
 185 }
 186
 187 fn def_id_corresponds_to_hir_dep_node(tcx: TyCtxt<'_>, def_id: LocalDefId) -> bool {
 188     let hir_id = tcx.hir().local_def_id_to_hir_id(def_id);
 189     def_id == hir_id.owner
 190 }