Split DepKindStruct in two.

cjgillot · cjgillot · commit cdc0b199a904 · 2021-02-19T17:51:56.000+01:00
diff --git a/compiler/rustc_middle/src/dep_graph/dep_node.rs b/compiler/rustc_middle/src/dep_graph/dep_node.rs
@@ -55,15 +55,13 @@
 //!
 //! [dependency graph]: https://rustc-dev-guide.rust-lang.org/query.html
 
-use crate::ty::query::QueryCtxt;
 use crate::ty::TyCtxt;
 
 use rustc_data_structures::fingerprint::Fingerprint;
 use rustc_hir::def_id::{CrateNum, DefId, LocalDefId, CRATE_DEF_INDEX};
 use rustc_hir::definitions::DefPathHash;
 use rustc_hir::HirId;
 use rustc_span::symbol::Symbol;
-use rustc_span::DUMMY_SP;
 use std::hash::Hash;
 
 pub use rustc_query_system::dep_graph::{DepContext, DepNodeParams};
@@ -92,53 +90,6 @@ pub struct DepKindStruct {
     // FIXME: Make this a simple boolean once DepNodeParams::can_reconstruct_query_key
     // can be made a specialized associated const.
     can_reconstruct_query_key: fn() -> bool,
-
-    /// The red/green evaluation system will try to mark a specific DepNode in the
-    /// dependency graph as green by recursively trying to mark the dependencies of
-    /// that `DepNode` as green. While doing so, it will sometimes encounter a `DepNode`
-    /// where we don't know if it is red or green and we therefore actually have
-    /// to recompute its value in order to find out. Since the only piece of
-    /// information that we have at that point is the `DepNode` we are trying to
-    /// re-evaluate, we need some way to re-run a query from just that. This is what
-    /// `force_from_dep_node()` implements.
-    ///
-    /// In the general case, a `DepNode` consists of a `DepKind` and an opaque
-    /// GUID/fingerprint that will uniquely identify the node. This GUID/fingerprint
-    /// is usually constructed by computing a stable hash of the query-key that the
-    /// `DepNode` corresponds to. Consequently, it is not in general possible to go
-    /// back from hash to query-key (since hash functions are not reversible). For
-    /// this reason `force_from_dep_node()` is expected to fail from time to time
-    /// because we just cannot find out, from the `DepNode` alone, what the
-    /// corresponding query-key is and therefore cannot re-run the query.
-    ///
-    /// The system deals with this case letting `try_mark_green` fail which forces
-    /// the root query to be re-evaluated.
-    ///
-    /// Now, if `force_from_dep_node()` would always fail, it would be pretty useless.
-    /// Fortunately, we can use some contextual information that will allow us to
-    /// reconstruct query-keys for certain kinds of `DepNode`s. In particular, we
-    /// enforce by construction that the GUID/fingerprint of certain `DepNode`s is a
-    /// valid `DefPathHash`. Since we also always build a huge table that maps every
-    /// `DefPathHash` in the current codebase to the corresponding `DefId`, we have
-    /// everything we need to re-run the query.
-    ///
-    /// Take the `mir_promoted` query as an example. Like many other queries, it
-    /// just has a single parameter: the `DefId` of the item it will compute the
-    /// validated MIR for. Now, when we call `force_from_dep_node()` on a `DepNode`
-    /// with kind `MirValidated`, we know that the GUID/fingerprint of the `DepNode`
-    /// is actually a `DefPathHash`, and can therefore just look up the corresponding
-    /// `DefId` in `tcx.def_path_hash_to_def_id`.
-    ///
-    /// When you implement a new query, it will likely have a corresponding new
-    /// `DepKind`, and you'll have to support it here in `force_from_dep_node()`. As
-    /// a rule of thumb, if your query takes a `DefId` or `LocalDefId` as sole parameter,
-    /// then `force_from_dep_node()` should not fail for it. Otherwise, you can just
-    /// add it to the "We don't have enough information to reconstruct..." group in
-    /// the match below.
-    pub(crate) force_from_dep_node: fn(tcx: QueryCtxt<'_>, dep_node: &DepNode) -> bool,
-
-    /// Invoke a query to put the on-disk cached value in memory.
-    pub(crate) try_load_from_on_disk_cache: fn(QueryCtxt<'_>, &DepNode),
 }
 
 impl std::ops::Deref for DepKind {
@@ -197,8 +148,7 @@ macro_rules! contains_eval_always_attr {
 #[allow(non_upper_case_globals)]
 pub mod dep_kind {
     use super::*;
-    use crate::ty::query::{queries, query_keys};
-    use rustc_query_system::query::{force_query, QueryDescription};
+    use crate::ty::query::query_keys;
 
     // We use this for most things when incr. comp. is turned off.
     pub const Null: DepKindStruct = DepKindStruct {
@@ -207,8 +157,6 @@ pub mod dep_kind {
         is_eval_always: false,
 
         can_reconstruct_query_key: || true,
-        force_from_dep_node: |_, dep_node| bug!("force_from_dep_node: encountered {:?}", dep_node),
-        try_load_from_on_disk_cache: |_, _| {},
     };
 
     pub const TraitSelect: DepKindStruct = DepKindStruct {
@@ -217,8 +165,6 @@ pub mod dep_kind {
         is_eval_always: false,
 
         can_reconstruct_query_key: || true,
-        force_from_dep_node: |_, _| false,
-        try_load_from_on_disk_cache: |_, _| {},
     };
 
     pub const CompileCodegenUnit: DepKindStruct = DepKindStruct {
@@ -227,8 +173,6 @@ pub mod dep_kind {
         is_eval_always: false,
 
         can_reconstruct_query_key: || false,
-        force_from_dep_node: |_, _| false,
-        try_load_from_on_disk_cache: |_, _| {},
     };
 
     macro_rules! define_query_dep_kinds {
@@ -247,54 +191,11 @@ pub mod dep_kind {
                         ::can_reconstruct_query_key()
                 }
 
-                fn recover<'tcx>(tcx: TyCtxt<'tcx>, dep_node: &DepNode) -> Option<query_keys::$variant<'tcx>> {
-                    <query_keys::$variant<'_> as DepNodeParams<TyCtxt<'_>>>::recover(tcx, dep_node)
-                }
-
-                fn force_from_dep_node(tcx: QueryCtxt<'_>, dep_node: &DepNode) -> bool {
-                    if is_anon {
-                        return false;
-                    }
-
-                    if !can_reconstruct_query_key() {
-                        return false;
-                    }
-
-                    if let Some(key) = recover(*tcx, dep_node) {
-                        force_query::<queries::$variant<'_>, _>(tcx, key, DUMMY_SP, *dep_node);
-                        return true;
-                    }
-
-                    false
-                }
-
-                fn try_load_from_on_disk_cache(tcx: QueryCtxt<'_>, dep_node: &DepNode) {
-                    if is_anon {
-                        return
-                    }
-
-                    if !can_reconstruct_query_key() {
-                        return
-                    }
-
-                    debug_assert!(tcx.dep_graph
-                                     .node_color(dep_node)
-                                     .map(|c| c.is_green())
-                                     .unwrap_or(false));
-
-                    let key = recover(*tcx, dep_node).unwrap_or_else(|| panic!("Failed to recover key for {:?} with hash {}", dep_node, dep_node.hash));
-                    if queries::$variant::cache_on_disk(tcx, &key, None) {
-                        let _ = tcx.$variant(key);
-                    }
-                }
-
                 DepKindStruct {
                     has_params,
                     is_anon,
                     is_eval_always,
                     can_reconstruct_query_key,
-                    force_from_dep_node,
-                    try_load_from_on_disk_cache,
                 }
             };)*
         );
@@ -310,7 +211,12 @@ macro_rules! define_dep_nodes {
         $variant:ident $(( $tuple_arg_ty:ty $(,)? ))*
       ,)*
     ) => (
-        static DEP_KINDS: &[DepKindStruct] = &[ $(dep_kind::$variant),* ];
+        #[macro_export]
+        macro_rules! make_dep_kind_array {
+            ($mod:ident) => {[ $(($mod::$variant),)* ]};
+        }
+
+        static DEP_KINDS: &[DepKindStruct] = &make_dep_kind_array!(dep_kind);
 
         /// This enum serves as an index into the `DEP_KINDS` array.
         #[derive(Clone, Copy, Debug, PartialEq, Eq, Hash, Encodable, Decodable)]
diff --git a/compiler/rustc_middle/src/dep_graph/mod.rs b/compiler/rustc_middle/src/dep_graph/mod.rs
@@ -3,6 +3,7 @@ use crate::ty::{self, TyCtxt};
 use rustc_data_structures::profiling::SelfProfilerRef;
 use rustc_data_structures::sync::Lock;
 
+#[macro_use]
 mod dep_node;
 
 pub use rustc_query_system::dep_graph::{
diff --git a/compiler/rustc_middle/src/lib.rs b/compiler/rustc_middle/src/lib.rs
@@ -76,6 +76,7 @@ pub mod query;
 
 #[macro_use]
 pub mod arena;
+#[macro_use]
 pub mod dep_graph;
 pub mod hir;
 pub mod ich;
diff --git a/compiler/rustc_middle/src/ty/query/mod.rs b/compiler/rustc_middle/src/ty/query/mod.rs
@@ -62,6 +62,7 @@ use std::sync::Arc;
 #[macro_use]
 mod plumbing;
 pub use plumbing::QueryCtxt;
+use plumbing::QueryStruct;
 pub(crate) use rustc_query_system::query::CycleError;
 use rustc_query_system::query::*;
 
diff --git a/compiler/rustc_middle/src/ty/query/plumbing.rs b/compiler/rustc_middle/src/ty/query/plumbing.rs
@@ -69,7 +69,8 @@ impl QueryContext for QueryCtxt<'tcx> {
     }
 
     fn try_load_from_on_disk_cache(&self, dep_node: &DepNode) {
-        (dep_node.kind.try_load_from_on_disk_cache)(*self, dep_node)
+        let cb = &super::QUERY_CALLBACKS[dep_node.kind as usize];
+        (cb.try_load_from_on_disk_cache)(*self, dep_node)
     }
 
     fn try_force_from_dep_node(&self, dep_node: &DepNode) -> bool {
@@ -126,7 +127,8 @@ impl QueryContext for QueryCtxt<'tcx> {
             "calling force_from_dep_node() on DepKind::codegen_unit"
         );
 
-        (dep_node.kind.force_from_dep_node)(*self, dep_node)
+        let cb = &super::QUERY_CALLBACKS[dep_node.kind as usize];
+        (cb.force_from_dep_node)(*self, dep_node)
     }
 
     fn has_errors_or_delayed_span_bugs(&self) -> bool {
@@ -307,6 +309,60 @@ impl<'tcx> Queries<'tcx> {
     }
 }
 
+/// This struct stores metadata about each Query.
+///
+/// Information is retrieved by indexing the `QUERIES` array using the integer value
+/// of the `DepKind`. Overall, this allows to implement `QueryContext` using this manual
+/// jump table instead of large matches.
+pub struct QueryStruct {
+    /// The red/green evaluation system will try to mark a specific DepNode in the
+    /// dependency graph as green by recursively trying to mark the dependencies of
+    /// that `DepNode` as green. While doing so, it will sometimes encounter a `DepNode`
+    /// where we don't know if it is red or green and we therefore actually have
+    /// to recompute its value in order to find out. Since the only piece of
+    /// information that we have at that point is the `DepNode` we are trying to
+    /// re-evaluate, we need some way to re-run a query from just that. This is what
+    /// `force_from_dep_node()` implements.
+    ///
+    /// In the general case, a `DepNode` consists of a `DepKind` and an opaque
+    /// GUID/fingerprint that will uniquely identify the node. This GUID/fingerprint
+    /// is usually constructed by computing a stable hash of the query-key that the
+    /// `DepNode` corresponds to. Consequently, it is not in general possible to go
+    /// back from hash to query-key (since hash functions are not reversible). For
+    /// this reason `force_from_dep_node()` is expected to fail from time to time
+    /// because we just cannot find out, from the `DepNode` alone, what the
+    /// corresponding query-key is and therefore cannot re-run the query.
+    ///
+    /// The system deals with this case letting `try_mark_green` fail which forces
+    /// the root query to be re-evaluated.
+    ///
+    /// Now, if `force_from_dep_node()` would always fail, it would be pretty useless.
+    /// Fortunately, we can use some contextual information that will allow us to
+    /// reconstruct query-keys for certain kinds of `DepNode`s. In particular, we
+    /// enforce by construction that the GUID/fingerprint of certain `DepNode`s is a
+    /// valid `DefPathHash`. Since we also always build a huge table that maps every
+    /// `DefPathHash` in the current codebase to the corresponding `DefId`, we have
+    /// everything we need to re-run the query.
+    ///
+    /// Take the `mir_promoted` query as an example. Like many other queries, it
+    /// just has a single parameter: the `DefId` of the item it will compute the
+    /// validated MIR for. Now, when we call `force_from_dep_node()` on a `DepNode`
+    /// with kind `MirValidated`, we know that the GUID/fingerprint of the `DepNode`
+    /// is actually a `DefPathHash`, and can therefore just look up the corresponding
+    /// `DefId` in `tcx.def_path_hash_to_def_id`.
+    ///
+    /// When you implement a new query, it will likely have a corresponding new
+    /// `DepKind`, and you'll have to support it here in `force_from_dep_node()`. As
+    /// a rule of thumb, if your query takes a `DefId` or `LocalDefId` as sole parameter,
+    /// then `force_from_dep_node()` should not fail for it. Otherwise, you can just
+    /// add it to the "We don't have enough information to reconstruct..." group in
+    /// the match below.
+    pub(crate) force_from_dep_node: fn(tcx: QueryCtxt<'_>, dep_node: &DepNode) -> bool,
+
+    /// Invoke a query to put the on-disk cached value in memory.
+    pub(crate) try_load_from_on_disk_cache: fn(QueryCtxt<'_>, &DepNode),
+}
+
 macro_rules! handle_cycle_error {
     ([][$tcx: expr, $error:expr]) => {{
         $tcx.report_cycle($error).emit();
@@ -545,6 +601,89 @@ macro_rules! define_queries {
             }
         })*
 
+        #[allow(non_upper_case_globals)]
+        pub mod query_callbacks {
+            use super::*;
+            use crate::dep_graph::DepNode;
+            use crate::ty::query::{queries, query_keys};
+            use rustc_query_system::dep_graph::DepNodeParams;
+            use rustc_query_system::query::{force_query, QueryDescription};
+
+            // We use this for most things when incr. comp. is turned off.
+            pub const Null: QueryStruct = QueryStruct {
+                force_from_dep_node: |_, dep_node| bug!("force_from_dep_node: encountered {:?}", dep_node),
+                try_load_from_on_disk_cache: |_, _| {},
+            };
+
+            pub const TraitSelect: QueryStruct = QueryStruct {
+                force_from_dep_node: |_, _| false,
+                try_load_from_on_disk_cache: |_, _| {},
+            };
+
+            pub const CompileCodegenUnit: QueryStruct = QueryStruct {
+                force_from_dep_node: |_, _| false,
+                try_load_from_on_disk_cache: |_, _| {},
+            };
+
+            $(pub const $name: QueryStruct = {
+                const is_anon: bool = is_anon!([$($modifiers)*]);
+
+                #[inline(always)]
+                fn can_reconstruct_query_key() -> bool {
+                    <query_keys::$name<'_> as DepNodeParams<TyCtxt<'_>>>
+                        ::can_reconstruct_query_key()
+                }
+
+                fn recover<'tcx>(tcx: TyCtxt<'tcx>, dep_node: &DepNode) -> Option<query_keys::$name<'tcx>> {
+                    <query_keys::$name<'_> as DepNodeParams<TyCtxt<'_>>>::recover(tcx, dep_node)
+                }
+
+                fn force_from_dep_node(tcx: QueryCtxt<'_>, dep_node: &DepNode) -> bool {
+                    if is_anon {
+                        return false;
+                    }
+
+                    if !can_reconstruct_query_key() {
+                        return false;
+                    }
+
+                    if let Some(key) = recover(*tcx, dep_node) {
+                        force_query::<queries::$name<'_>, _>(tcx, key, DUMMY_SP, *dep_node);
+                        return true;
+                    }
+
+                    false
+                }
+
+                fn try_load_from_on_disk_cache(tcx: QueryCtxt<'_>, dep_node: &DepNode) {
+                    if is_anon {
+                        return
+                    }
+
+                    if !can_reconstruct_query_key() {
+                        return
+                    }
+
+                    debug_assert!(tcx.dep_graph
+                                     .node_color(dep_node)
+                                     .map(|c| c.is_green())
+                                     .unwrap_or(false));
+
+                    let key = recover(*tcx, dep_node).unwrap_or_else(|| panic!("Failed to recover key for {:?} with hash {}", dep_node, dep_node.hash));
+                    if queries::$name::cache_on_disk(tcx, &key, None) {
+                        let _ = tcx.$name(key);
+                    }
+                }
+
+                QueryStruct {
+                    force_from_dep_node,
+                    try_load_from_on_disk_cache,
+                }
+            };)*
+        }
+
+        static QUERY_CALLBACKS: &[QueryStruct] = &make_dep_kind_array!(query_callbacks);
+
         define_provider_struct! {
             tcx: $tcx,
             input: ($(([$($modifiers)*] [$name] [$($K)*] [$V]))*)
