Auto merge of rust-lang#70162 - cjgillot:split_query, r=Zoxc

Move the query system to a dedicated crate

The query system `rustc::ty::query` is split out into the `rustc_query_system` crate.

Some commits are unformatted, to ease rebasing.

Based on rust-lang#67761 and rust-lang#69910.

r? @Zoxc

Author: bors

Cargo.lock

@@ -4081,12 +4081,12 @@ version = "0.0.0"
 dependencies = [
  "log",
  "parking_lot 0.9.0",
- "rustc_ast",
+ "rustc-rayon-core",
  "rustc_data_structures",
  "rustc_errors",
- "rustc_hir",
  "rustc_index",
  "rustc_macros",
+ "rustc_span",
  "serialize",
  "smallvec 1.0.0",
 ]

src/librustc/dep_graph/mod.rs

@@ -8,7 +8,6 @@ use rustc_errors::Diagnostic;
 use rustc_hir::def_id::DefId;
 
 mod dep_node;
-mod safe;
 
 pub(crate) use rustc_query_system::dep_graph::DepNodeParams;
 pub use rustc_query_system::dep_graph::{
@@ -17,8 +16,6 @@ pub use rustc_query_system::dep_graph::{
 };
 
 pub use dep_node::{label_strs, DepConstructor, DepKind, DepNode, DepNodeExt};
-pub use safe::AssertDepGraphSafe;
-pub use safe::DepGraphSafe;
 
 pub type DepGraph = rustc_query_system::dep_graph::DepGraph<DepKind>;
 pub type TaskDeps = rustc_query_system::dep_graph::TaskDeps<DepKind>;
@@ -27,6 +24,8 @@ pub type PreviousDepGraph = rustc_query_system::dep_graph::PreviousDepGraph<DepK
 pub type SerializedDepGraph = rustc_query_system::dep_graph::SerializedDepGraph<DepKind>;
 
 impl rustc_query_system::dep_graph::DepKind for DepKind {
+    const NULL: Self = DepKind::Null;
+
     fn is_eval_always(&self) -> bool {
         DepKind::is_eval_always(self)
     }
@@ -82,6 +81,10 @@ impl rustc_query_system::dep_graph::DepKind for DepKind {
             op(icx.task_deps)
         })
     }
+
+    fn can_reconstruct_query_key(&self) -> bool {
+        DepKind::can_reconstruct_query_key(self)
+    }
 }
 
 impl<'tcx> DepContext for TyCtxt<'tcx> {
@@ -92,6 +95,10 @@ impl<'tcx> DepContext for TyCtxt<'tcx> {
         TyCtxt::create_stable_hashing_context(*self)
     }
 
+    fn debug_dep_tasks(&self) -> bool {
+        self.sess.opts.debugging_opts.dep_tasks
+    }
+
     fn try_force_from_dep_node(&self, dep_node: &DepNode) -> bool {
         // FIXME: This match is just a workaround for incremental bugs and should
         // be removed. https://github.com/rust-lang/rust/issues/62649 is one such
@@ -160,6 +167,14 @@ impl<'tcx> DepContext for TyCtxt<'tcx> {
         self.queries.on_disk_cache.store_diagnostics(dep_node_index, diagnostics)
     }
 
+    fn store_diagnostics_for_anon_node(
+        &self,
+        dep_node_index: DepNodeIndex,
+        diagnostics: ThinVec<Diagnostic>,
+    ) {
+        self.queries.on_disk_cache.store_diagnostics_for_anon_node(dep_node_index, diagnostics)
+    }
+
     fn profiler(&self) -> &SelfProfilerRef {
         &self.prof
     }
@@ -169,23 +184,3 @@ fn def_id_corresponds_to_hir_dep_node(tcx: TyCtxt<'_>, def_id: DefId) -> bool {
     let hir_id = tcx.hir().as_local_hir_id(def_id).unwrap();
     def_id.index == hir_id.owner.local_def_index
 }
-
-impl rustc_query_system::HashStableContext for StableHashingContext<'_> {
-    fn debug_dep_tasks(&self) -> bool {
-        self.sess().opts.debugging_opts.dep_tasks
-    }
-}
-
-impl rustc_query_system::HashStableContextProvider<StableHashingContext<'tcx>> for TyCtxt<'tcx> {
-    fn get_stable_hashing_context(&self) -> StableHashingContext<'tcx> {
-        self.create_stable_hashing_context()
-    }
-}
-
-impl rustc_query_system::HashStableContextProvider<StableHashingContext<'a>>
-    for StableHashingContext<'a>
-{
-    fn get_stable_hashing_context(&self) -> Self {
-        self.clone()
-    }
-}

src/librustc/dep_graph/safe.rs

@@ -194,8 +194,6 @@ impl<'a> StableHashingContextProvider<'a> for StableHashingContext<'a> {
     }
 }
 
-impl<'a> crate::dep_graph::DepGraphSafe for StableHashingContext<'a> {}
-
 impl<'a> HashStable<StableHashingContext<'a>> for ast::NodeId {
     fn hash_stable(&self, _: &mut StableHashingContext<'a>, _: &mut StableHasher) {
         panic!("Node IDs should not appear in incremental state");

src/librustc/ich/hcx.rs

@@ -1603,7 +1603,7 @@ nop_list_lift! {substs; GenericArg<'a> => GenericArg<'tcx>}
 pub mod tls {
     use super::{ptr_eq, GlobalCtxt, TyCtxt};
 
-    use crate::dep_graph::TaskDeps;
+    use crate::dep_graph::{DepKind, TaskDeps};
     use crate::ty::query;
     use rustc_data_structures::sync::{self, Lock};
     use rustc_data_structures::thin_vec::ThinVec;
@@ -1630,7 +1630,7 @@ pub mod tls {
 
         /// The current query job, if any. This is updated by `JobOwner::start` in
         /// `ty::query::plumbing` when executing a query.
-        pub query: Option<query::QueryJobId>,
+        pub query: Option<query::QueryJobId<DepKind>>,
 
         /// Where to store diagnostics for the current query job, if any.
         /// This is updated by `JobOwner::start` in `ty::query::plumbing` when executing a query.