Extract most code from define_feedable!

Author: Zalathar

compiler/rustc_middle/src/query/mod.rs

@@ -70,7 +70,6 @@ use std::sync::Arc;
 use rustc_abi::Align;
 use rustc_arena::TypedArena;
 use rustc_ast::expand::allocator::AllocatorKind;
-use rustc_data_structures::fingerprint::Fingerprint;
 use rustc_data_structures::fx::{FxIndexMap, FxIndexSet};
 use rustc_data_structures::sorted_map::SortedMap;
 use rustc_data_structures::steal::Steal;
@@ -88,9 +87,7 @@ use rustc_index::IndexVec;
 use rustc_lint_defs::LintId;
 use rustc_macros::rustc_queries;
 use rustc_query_system::ich::StableHashingContext;
-use rustc_query_system::query::{
-    QueryCache, QueryMode, QueryStackDeferred, QueryState, try_get_cached,
-};
+use rustc_query_system::query::{QueryMode, QueryStackDeferred, QueryState};
 use rustc_session::Limits;
 use rustc_session::config::{EntryFnType, OptLevel, OutputFilenames, SymbolManglingVersion};
 use rustc_session::cstore::{

compiler/rustc_middle/src/query/plumbing.rs

@@ -1,11 +1,14 @@
+use std::fmt::Debug;
 use std::ops::Deref;
 
+use rustc_data_structures::fingerprint::Fingerprint;
 use rustc_data_structures::sync::{AtomicU64, WorkerLocal};
 use rustc_hir::def_id::{DefId, LocalDefId};
 use rustc_hir::hir_id::OwnerId;
 use rustc_macros::HashStable;
 use rustc_query_system::HandleCycleError;
-use rustc_query_system::dep_graph::{DepNodeIndex, SerializedDepNodeIndex};
+use rustc_query_system::dep_graph::{DepNodeIndex, DepNodeParams, SerializedDepNodeIndex};
+use rustc_query_system::ich::StableHashingContext;
 pub(crate) use rustc_query_system::query::QueryJobId;
 use rustc_query_system::query::*;
 use rustc_span::{DUMMY_SP, ErrorGuaranteed, Span};
@@ -14,6 +17,7 @@ pub use sealed::IntoQueryParam;
 use super::erase::EraseType;
 use crate::dep_graph;
 use crate::dep_graph::DepKind;
+use crate::query::erase::{Erase, restore};
 use crate::query::on_disk_cache::{CacheEncoder, EncodedDepNodeIndex, OnDiskCache};
 use crate::query::{
     DynamicQueries, ExternProviders, Providers, QueryArenas, QueryCaches, QueryEngine, QueryStates,
@@ -567,54 +571,77 @@ macro_rules! define_feedable {
 
                 let tcx = self.tcx;
                 let erased = queries::$name::provided_to_erased(tcx, value);
-                let value = restore::<$V>(erased);
                 let cache = &tcx.query_system.caches.$name;
 
                 let name: &'static str = stringify!($name);
                 let dep_kind: dep_graph::DepKind = dep_graph::dep_kinds::$name;
                 let hasher: Option<fn(&mut StableHashingContext<'_>, &_) -> _> = hash_result!([$($modifiers)*]);
-                match try_get_cached(tcx, cache, &key) {
-                    Some(old) => {
-                        let old = restore::<$V>(old);
-                        if let Some(hasher) = hasher {
-                            let (value_hash, old_hash): (Fingerprint, Fingerprint) = tcx.with_stable_hashing_context(|mut hcx|
-                                (hasher(&mut hcx, &value), hasher(&mut hcx, &old))
-                            );
-                            if old_hash != value_hash {
-                                // We have an inconsistency. This can happen if one of the two
-                                // results is tainted by errors. In this case, delay a bug to
-                                // ensure compilation is doomed, and keep the `old` value.
-                                tcx.dcx().delayed_bug(format!(
-                                    "Trying to feed an already recorded value for query {name} key={key:?}:\n\
-                                    old value: {old:?}\nnew value: {value:?}",
-                                ));
-                            }
-                        } else {
-                            // The query is `no_hash`, so we have no way to perform a sanity check.
-                            // If feeding the same value multiple times needs to be supported,
-                            // the query should not be marked `no_hash`.
-                            bug!(
-                                "Trying to feed an already recorded value for query {name} key={key:?}:\n\
-                                old value: {old:?}\nnew value: {value:?}",
-                            )
-                        }
-                    }
-                    None => {
-                        let dep_node = dep_graph::DepNode::construct(tcx, dep_kind, &key);
-                        let dep_node_index = tcx.dep_graph.with_feed_task(
-                            dep_node,
-                            tcx,
-                            &value,
-                            hasher,
-                        );
-                        cache.complete(key, erased, dep_node_index);
-                    }
-                }
+
+                $crate::query::plumbing::query_feed_inner(
+                    tcx,
+                    name,
+                    dep_kind,
+                    hasher,
+                    cache,
+                    key,
+                    erased,
+                );
             }
         })*
     }
 }
 
+/// Common implementation of query feeding, used by `define_feedable!`.
+pub(crate) fn query_feed_inner<'tcx, Cache, Value>(
+    tcx: TyCtxt<'tcx>,
+    name: &'static str,
+    dep_kind: DepKind,
+    hasher: Option<fn(&mut StableHashingContext<'_>, &Value) -> Fingerprint>,
+    cache: &Cache,
+    key: Cache::Key,
+    erased: Erase<Value>,
+) where
+    Cache: QueryCache<Value = Erase<Value>>,
+    Cache::Key: DepNodeParams<TyCtxt<'tcx>>,
+    Value: EraseType + Debug,
+{
+    let value = restore::<Value>(erased);
+
+    match try_get_cached(tcx, cache, &key) {
+        Some(old) => {
+            let old = restore::<Value>(old);
+            if let Some(hasher) = hasher {
+                let (value_hash, old_hash): (Fingerprint, Fingerprint) = tcx
+                    .with_stable_hashing_context(|mut hcx| {
+                        (hasher(&mut hcx, &value), hasher(&mut hcx, &old))
+                    });
+                if old_hash != value_hash {
+                    // We have an inconsistency. This can happen if one of the two
+                    // results is tainted by errors. In this case, delay a bug to
+                    // ensure compilation is doomed, and keep the `old` value.
+                    tcx.dcx().delayed_bug(format!(
+                        "Trying to feed an already recorded value for query {name} key={key:?}:\n\
+                        old value: {old:?}\nnew value: {value:?}",
+                    ));
+                }
+            } else {
+                // The query is `no_hash`, so we have no way to perform a sanity check.
+                // If feeding the same value multiple times needs to be supported,
+                // the query should not be marked `no_hash`.
+                bug!(
+                    "Trying to feed an already recorded value for query {name} key={key:?}:\n\
+                    old value: {old:?}\nnew value: {value:?}",
+                )
+            }
+        }
+        None => {
+            let dep_node = dep_graph::DepNode::construct(tcx, dep_kind, &key);
+            let dep_node_index = tcx.dep_graph.with_feed_task(dep_node, tcx, &value, hasher);
+            cache.complete(key, erased, dep_node_index);
+        }
+    }
+}
+
 // Each of these queries corresponds to a function pointer field in the
 // `Providers` struct for requesting a value of that type, and a method
 // on `tcx: TyCtxt` (and `tcx.at(span)`) for doing that request in a way