src/librustc/dep_graph/mod.rs

   1 use crate::hir::map::definitions::DefPathHash;
   2 use crate::ich::StableHashingContext;
   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::DefId;
   9
  10 mod dep_node;
  11 mod safe;
  12
  13 pub(crate) use rustc_query_system::dep_graph::DepNodeParams;
  14 pub use rustc_query_system::dep_graph::{
  15     debug, hash_result, DepContext, DepNodeColor, DepNodeIndex, SerializedDepNodeIndex,
  16     WorkProduct, WorkProductFileKind, WorkProductId,
  17 };
  18
  19 pub use dep_node::{label_strs, DepConstructor, DepKind, DepNode, DepNodeExt};
  20 pub use safe::AssertDepGraphSafe;
  21 pub use safe::DepGraphSafe;
  22
  23 pub type DepGraph = rustc_query_system::dep_graph::DepGraph<DepKind>;
  24 pub type TaskDeps = rustc_query_system::dep_graph::TaskDeps<DepKind>;
  25 pub type DepGraphQuery = rustc_query_system::dep_graph::DepGraphQuery<DepKind>;
  26 pub type PreviousDepGraph = rustc_query_system::dep_graph::PreviousDepGraph<DepKind>;
  27 pub type SerializedDepGraph = rustc_query_system::dep_graph::SerializedDepGraph<DepKind>;
  28
  29 impl rustc_query_system::dep_graph::DepKind for DepKind {
  30     fn is_eval_always(&self) -> bool {
  31         DepKind::is_eval_always(self)
  32     }
  33
  34     fn has_params(&self) -> bool {
  35         DepKind::has_params(self)
  36     }
  37
  38     fn debug_node(node: &DepNode, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
  39         write!(f, "{:?}", node.kind)?;
  40
  41         if !node.kind.has_params() && !node.kind.is_anon() {
  42             return Ok(());
  43         }
  44
  45         write!(f, "(")?;
  46
  47         ty::tls::with_opt(|opt_tcx| {
  48             if let Some(tcx) = opt_tcx {
  49                 if let Some(def_id) = tcx.extract_def_id(node) {
  50                     write!(f, "{}", tcx.def_path_debug_str(def_id))?;
  51                 } else if let Some(ref s) = tcx.dep_graph.dep_node_debug_str(*node) {
  52                     write!(f, "{}", s)?;
  53                 } else {
  54                     write!(f, "{}", node.hash)?;
  55                 }
  56             } else {
  57                 write!(f, "{}", node.hash)?;
  58             }
  59             Ok(())
  60         })?;
  61
  62         write!(f, ")")
  63     }
  64
  65     fn with_deps<OP, R>(task_deps: Option<&Lock<TaskDeps>>, op: OP) -> R
  66     where
  67         OP: FnOnce() -> R,
  68     {
  69         ty::tls::with_context(|icx| {
  70             let icx = ty::tls::ImplicitCtxt { task_deps, ..icx.clone() };
  71
  72             ty::tls::enter_context(&icx, |_| op())
  73         })
  74     }
  75
  76     fn read_deps<OP>(op: OP) -> ()
  77     where
  78         OP: for<'a> FnOnce(Option<&'a Lock<TaskDeps>>) -> (),
  79     {
  80         ty::tls::with_context_opt(|icx| {
  81             let icx = if let Some(icx) = icx { icx } else { return };
  82             op(icx.task_deps)
  83         })
  84     }
  85 }
  86
  87 impl<'tcx> DepContext for TyCtxt<'tcx> {
  88     type DepKind = DepKind;
  89     type StableHashingContext = StableHashingContext<'tcx>;
  90
  91     fn create_stable_hashing_context(&self) -> Self::StableHashingContext {
  92         TyCtxt::create_stable_hashing_context(*self)
  93     }
  94
  95     /// Extracts the DefId corresponding to this DepNode. This will work
  96     /// if two conditions are met:
  97     ///
  98     /// 1. The Fingerprint of the DepNode actually is a DefPathHash, and
  99     /// 2. the item that the DefPath refers to exists in the current tcx.
 100     ///
 101     /// Condition (1) is determined by the DepKind variant of the
 102     /// DepNode. Condition (2) might not be fulfilled if a DepNode
 103     /// refers to something from the previous compilation session that
 104     /// has been removed.
 105     fn extract_def_id(&self, node: &DepNode) -> Option<DefId> {
 106         if node.kind.can_reconstruct_query_key() {
 107             let def_path_hash = DefPathHash(node.hash);
 108             self.def_path_hash_to_def_id.as_ref()?.get(&def_path_hash).cloned()
 109         } else {
 110             None
 111         }
 112     }
 113
 114     fn try_force_previous_green(&self, dep_dep_node: &DepNode) -> bool {
 115         // FIXME: This match is just a workaround for incremental bugs and should
 116         // be removed. https://github.com/rust-lang/rust/issues/62649 is one such
 117         // bug that must be fixed before removing this.
 118         match dep_dep_node.kind {
 119             DepKind::hir_owner | DepKind::hir_owner_nodes | DepKind::CrateMetadata => {
 120                 if let Some(def_id) = self.extract_def_id(dep_dep_node) {
 121                     if def_id_corresponds_to_hir_dep_node(*self, def_id) {
 122                         if dep_dep_node.kind == DepKind::CrateMetadata {
 123                             // The `DefPath` has corresponding node,
 124                             // and that node should have been marked
 125                             // either red or green in `data.colors`.
 126                             bug!(
 127                                 "DepNode {:?} should have been \
 128                              pre-marked as red or green but wasn't.",
 129                                 dep_dep_node
 130                             );
 131                         }
 132                     } else {
 133                         // This `DefPath` does not have a
 134                         // corresponding `DepNode` (e.g. a
 135                         // struct field), and the ` DefPath`
 136                         // collided with the `DefPath` of a
 137                         // proper item that existed in the
 138                         // previous compilation session.
 139                         //
 140                         // Since the given `DefPath` does not
 141                         // denote the item that previously
 142                         // existed, we just fail to mark green.
 143                         return false;
 144                     }
 145                 } else {
 146                     // If the node does not exist anymore, we
 147                     // just fail to mark green.
 148                     return false;
 149                 }
 150             }
 151             _ => {
 152                 // For other kinds of nodes it's OK to be
 153                 // forced.
 154             }
 155         }
 156
 157         debug!("try_force_previous_green({:?}) --- trying to force", dep_dep_node);
 158         ty::query::force_from_dep_node(*self, dep_dep_node)
 159     }
 160
 161     fn has_errors_or_delayed_span_bugs(&self) -> bool {
 162         self.sess.has_errors_or_delayed_span_bugs()
 163     }
 164
 165     fn diagnostic(&self) -> &rustc_errors::Handler {
 166         self.sess.diagnostic()
 167     }
 168
 169     // Interactions with on_disk_cache
 170     fn try_load_from_on_disk_cache(&self, dep_node: &DepNode) {
 171         use crate::mir::interpret::GlobalId;
 172         use crate::ty::query::queries;
 173         use crate::ty::query::QueryDescription;
 174         rustc_dep_node_try_load_from_on_disk_cache!(dep_node, *self)
 175     }
 176
 177     fn load_diagnostics(&self, prev_dep_node_index: SerializedDepNodeIndex) -> Vec<Diagnostic> {
 178         self.queries.on_disk_cache.load_diagnostics(*self, prev_dep_node_index)
 179     }
 180
 181     fn store_diagnostics(&self, dep_node_index: DepNodeIndex, diagnostics: ThinVec<Diagnostic>) {
 182         self.queries.on_disk_cache.store_diagnostics(dep_node_index, diagnostics)
 183     }
 184
 185     fn profiler(&self) -> &SelfProfilerRef {
 186         &self.prof
 187     }
 188 }
 189
 190 fn def_id_corresponds_to_hir_dep_node(tcx: TyCtxt<'_>, def_id: DefId) -> bool {
 191     let hir_id = tcx.hir().as_local_hir_id(def_id).unwrap();
 192     def_id.index == hir_id.owner.local_def_index
 193 }
 194
 195 impl rustc_query_system::HashStableContext for StableHashingContext<'_> {
 196     fn debug_dep_tasks(&self) -> bool {
 197         self.sess().opts.debugging_opts.dep_tasks
 198     }
 199 }
 200
 201 impl rustc_query_system::HashStableContextProvider<StableHashingContext<'tcx>> for TyCtxt<'tcx> {
 202     fn get_stable_hashing_context(&self) -> StableHashingContext<'tcx> {
 203         self.create_stable_hashing_context()
 204     }
 205 }
 206
 207 impl rustc_query_system::HashStableContextProvider<StableHashingContext<'a>>
 208     for StableHashingContext<'a>
 209 {
 210     fn get_stable_hashing_context(&self) -> Self {
 211         self.clone()
 212     }
 213 }