compiler/rustc_middle/src/dep_graph/mod.rs

   1 use crate::ich::StableHashingContext;
   2 use crate::ty::{self, TyCtxt};
   3 use rustc_data_structures::profiling::SelfProfilerRef;
   4 use rustc_data_structures::sync::Lock;
   5 use rustc_data_structures::thin_vec::ThinVec;
   6 use rustc_errors::Diagnostic;
   7 use rustc_hir::def_id::LocalDefId;
   8
   9 mod dep_node;
  10
  11 pub(crate) use rustc_query_system::dep_graph::DepNodeParams;
  12 pub use rustc_query_system::dep_graph::{
  13     debug, hash_result, DepContext, DepNodeColor, DepNodeIndex, SerializedDepNodeIndex,
  14     WorkProduct, WorkProductId,
  15 };
  16
  17 pub use dep_node::{label_strs, DepConstructor, DepKind, DepNode, DepNodeExt};
  18
  19 pub type DepGraph = rustc_query_system::dep_graph::DepGraph<DepKind>;
  20 pub type TaskDeps = rustc_query_system::dep_graph::TaskDeps<DepKind>;
  21 pub type DepGraphQuery = rustc_query_system::dep_graph::DepGraphQuery<DepKind>;
  22 pub type PreviousDepGraph = rustc_query_system::dep_graph::PreviousDepGraph<DepKind>;
  23 pub type SerializedDepGraph = rustc_query_system::dep_graph::SerializedDepGraph<DepKind>;
  24
  25 impl rustc_query_system::dep_graph::DepKind for DepKind {
  26     const NULL: Self = DepKind::Null;
  27
  28     #[inline(always)]
  29     fn can_reconstruct_query_key(&self) -> bool {
  30         DepKind::can_reconstruct_query_key(self)
  31     }
  32
  33     #[inline(always)]
  34     fn is_eval_always(&self) -> bool {
  35         self.is_eval_always
  36     }
  37
  38     #[inline(always)]
  39     fn has_params(&self) -> bool {
  40         self.has_params
  41     }
  42
  43     fn debug_node(node: &DepNode, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
  44         write!(f, "{:?}", node.kind)?;
  45
  46         if !node.kind.has_params && !node.kind.is_anon {
  47             return Ok(());
  48         }
  49
  50         write!(f, "(")?;
  51
  52         ty::tls::with_opt(|opt_tcx| {
  53             if let Some(tcx) = opt_tcx {
  54                 if let Some(def_id) = node.extract_def_id(tcx) {
  55                     write!(f, "{}", tcx.def_path_debug_str(def_id))?;
  56                 } else if let Some(ref s) = tcx.dep_graph.dep_node_debug_str(*node) {
  57                     write!(f, "{}", s)?;
  58                 } else {
  59                     write!(f, "{}", node.hash)?;
  60                 }
  61             } else {
  62                 write!(f, "{}", node.hash)?;
  63             }
  64             Ok(())
  65         })?;
  66
  67         write!(f, ")")
  68     }
  69
  70     fn with_deps<OP, R>(task_deps: Option<&Lock<TaskDeps>>, op: OP) -> R
  71     where
  72         OP: FnOnce() -> R,
  73     {
  74         ty::tls::with_context(|icx| {
  75             let icx = ty::tls::ImplicitCtxt { task_deps, ..icx.clone() };
  76
  77             ty::tls::enter_context(&icx, |_| op())
  78         })
  79     }
  80
  81     fn read_deps<OP>(op: OP)
  82     where
  83         OP: for<'a> FnOnce(Option<&'a Lock<TaskDeps>>),
  84     {
  85         ty::tls::with_context_opt(|icx| {
  86             let icx = if let Some(icx) = icx { icx } else { return };
  87             op(icx.task_deps)
  88         })
  89     }
  90 }
  91
  92 impl<'tcx> DepContext for TyCtxt<'tcx> {
  93     type DepKind = DepKind;
  94     type StableHashingContext = StableHashingContext<'tcx>;
  95
  96     fn register_reused_dep_node(&self, dep_node: &DepNode) {
  97         if let Some(cache) = self.queries.on_disk_cache.as_ref() {
  98             cache.register_reused_dep_node(*self, dep_node)
  99         }
 100     }
 101
 102     fn create_stable_hashing_context(&self) -> Self::StableHashingContext {
 103         TyCtxt::create_stable_hashing_context(*self)
 104     }
 105
 106     fn debug_dep_tasks(&self) -> bool {
 107         self.sess.opts.debugging_opts.dep_tasks
 108     }
 109     fn debug_dep_node(&self) -> bool {
 110         self.sess.opts.debugging_opts.incremental_info
 111             || self.sess.opts.debugging_opts.query_dep_graph
 112     }
 113
 114     fn try_force_from_dep_node(&self, 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_node.kind {
 119             DepKind::hir_owner | DepKind::hir_owner_nodes | DepKind::CrateMetadata => {
 120                 if let Some(def_id) = dep_node.extract_def_id(*self) {
 121                     if def_id_corresponds_to_hir_dep_node(*self, def_id.expect_local()) {
 122                         if 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_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_from_dep_node({:?}) --- trying to force", dep_node);
 158         ty::query::force_from_dep_node(*self, 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         (dep_node.kind.try_load_from_on_disk_cache)(*self, dep_node)
 172     }
 173
 174     fn load_diagnostics(&self, prev_dep_node_index: SerializedDepNodeIndex) -> Vec<Diagnostic> {
 175         self.queries
 176             .on_disk_cache
 177             .as_ref()
 178             .map(|c| c.load_diagnostics(*self, prev_dep_node_index))
 179             .unwrap_or_default()
 180     }
 181
 182     fn store_diagnostics(&self, dep_node_index: DepNodeIndex, diagnostics: ThinVec<Diagnostic>) {
 183         if let Some(c) = self.queries.on_disk_cache.as_ref() {
 184             c.store_diagnostics(dep_node_index, diagnostics)
 185         }
 186     }
 187
 188     fn store_diagnostics_for_anon_node(
 189         &self,
 190         dep_node_index: DepNodeIndex,
 191         diagnostics: ThinVec<Diagnostic>,
 192     ) {
 193         if let Some(c) = self.queries.on_disk_cache.as_ref() {
 194             c.store_diagnostics_for_anon_node(dep_node_index, diagnostics)
 195         }
 196     }
 197
 198     fn profiler(&self) -> &SelfProfilerRef {
 199         &self.prof
 200     }
 201 }
 202
 203 fn def_id_corresponds_to_hir_dep_node(tcx: TyCtxt<'_>, def_id: LocalDefId) -> bool {
 204     let hir_id = tcx.hir().local_def_id_to_hir_id(def_id);
 205     def_id == hir_id.owner
 206 }