Pass in dep kind names to the duplicate dep node check

compiler/rustc_incremental/src/persist/load.rs

@@ -91,7 +91,10 @@ fn delete_dirty_work_product(sess: &Session, swp: SerializedWorkProduct) {
     work_product::delete_workproduct_files(sess, &swp.work_product);
 }
 
-fn load_dep_graph(sess: &Session) -> LoadResult<(Arc<SerializedDepGraph>, WorkProductMap)> {
+fn load_dep_graph(
+    sess: &Session,
+    deps: &DepsType,
+) -> LoadResult<(Arc<SerializedDepGraph>, WorkProductMap)> {
     let prof = sess.prof.clone();
 
     if sess.opts.incremental.is_none() {
@@ -171,7 +174,7 @@ fn load_dep_graph(sess: &Session) -> LoadResult<(Arc<SerializedDepGraph>, WorkPr
                 return LoadResult::DataOutOfDate;
             }
 
-            let dep_graph = SerializedDepGraph::decode::<DepsType>(&mut decoder);
+            let dep_graph = SerializedDepGraph::decode::<DepsType>(&mut decoder, deps);
 
             LoadResult::Ok { data: (dep_graph, prev_work_products) }
         }
@@ -205,11 +208,11 @@ pub fn load_query_result_cache(sess: &Session) -> Option<OnDiskCache> {
 
 /// Setups the dependency graph by loading an existing graph from disk and set up streaming of a
 /// new graph to an incremental session directory.
-pub fn setup_dep_graph(sess: &Session, crate_name: Symbol) -> DepGraph {
+pub fn setup_dep_graph(sess: &Session, crate_name: Symbol, deps: &DepsType) -> DepGraph {
     // `load_dep_graph` can only be called after `prepare_session_directory`.
     prepare_session_directory(sess, crate_name);
 
-    let res = sess.opts.build_dep_graph().then(|| load_dep_graph(sess));
+    let res = sess.opts.build_dep_graph().then(|| load_dep_graph(sess, deps));
 
     if sess.opts.incremental.is_some() {
         sess.time("incr_comp_garbage_collect_session_directories", || {

compiler/rustc_interface/src/passes.rs

@@ -19,6 +19,7 @@ use rustc_incremental::setup_dep_graph;
 use rustc_lint::{BufferedEarlyLint, EarlyCheckNode, LintStore, unerased_lint_store};
 use rustc_metadata::creader::CStore;
 use rustc_middle::arena::Arena;
+use rustc_middle::dep_graph::DepsType;
 use rustc_middle::ty::{self, CurrentGcx, GlobalCtxt, RegisteredTools, TyCtxt};
 use rustc_middle::util::Providers;
 use rustc_parse::{
@@ -774,7 +775,9 @@ pub fn create_and_enter_global_ctxt<T, F: for<'tcx> FnOnce(TyCtxt<'tcx>) -> T>(
         sess.cfg_version,
     );
     let outputs = util::build_output_filenames(&pre_configured_attrs, sess);
-    let dep_graph = setup_dep_graph(sess, crate_name);
+
+    let dep_type = DepsType { dep_names: rustc_query_impl::dep_kind_names() };
+    let dep_graph = setup_dep_graph(sess, crate_name, &dep_type);
 
     let cstore =
         FreezeLock::new(Box::new(CStore::new(compiler.codegen_backend.metadata_loader())) as _);

compiler/rustc_middle/src/dep_graph/dep_node.rs

@@ -21,6 +21,15 @@ macro_rules! define_dep_nodes {
             ($mod:ident) => {[ $($mod::$variant()),* ]};
         }
 
+        #[macro_export]
+        macro_rules! make_dep_kind_name_array {
+            ($mod:ident) => {
+                vec! {
+                    $(*$mod::$variant().name),*
+                }
+            };
+        }
+
         /// This enum serves as an index into arrays built by `make_dep_kind_array`.
         // This enum has more than u8::MAX variants so we need some kind of multi-byte
         // encoding. The derived Encodable/Decodable uses leb128 encoding which is

compiler/rustc_middle/src/dep_graph/mod.rs

@@ -20,7 +20,9 @@ pub type DepGraph = rustc_query_system::dep_graph::DepGraph<DepsType>;
 pub type DepKindStruct<'tcx> = rustc_query_system::dep_graph::DepKindStruct<TyCtxt<'tcx>>;
 
 #[derive(Clone)]
-pub struct DepsType;
+pub struct DepsType {
+    pub dep_names: Vec<&'static str>,
+}
 
 impl Deps for DepsType {
     fn with_deps<OP, R>(task_deps: TaskDepsRef<'_>, op: OP) -> R
@@ -44,6 +46,10 @@ impl Deps for DepsType {
         })
     }
 
+    fn name(&self, dep_kind: DepKind) -> &'static str {
+        self.dep_names[dep_kind.as_usize()]
+    }
+
     const DEP_KIND_NULL: DepKind = dep_kinds::Null;
     const DEP_KIND_RED: DepKind = dep_kinds::Red;
     const DEP_KIND_SIDE_EFFECT: DepKind = dep_kinds::SideEffect;

compiler/rustc_query_impl/src/plumbing.rs

@@ -863,5 +863,9 @@ macro_rules! define_queries {
         pub fn query_callbacks<'tcx>(arena: &'tcx Arena<'tcx>) -> &'tcx [DepKindStruct<'tcx>] {
             arena.alloc_from_iter(rustc_middle::make_dep_kind_array!(query_callbacks))
         }
+
+        pub fn dep_kind_names() -> Vec<&'static str> {
+            rustc_middle::make_dep_kind_name_array!(query_callbacks)
+        }
     }
 }

compiler/rustc_query_system/src/dep_graph/mod.rs

@@ -100,6 +100,8 @@ pub trait Deps {
     where
         OP: for<'a> FnOnce(TaskDepsRef<'a>);
 
+    fn name(&self, dep_kind: DepKind) -> &'static str;
+
     /// We use this for most things when incr. comp. is turned off.
     const DEP_KIND_NULL: DepKind;
 
@@ -154,7 +156,7 @@ pub enum FingerprintStyle {
 
 impl FingerprintStyle {
     #[inline]
-    pub fn reconstructible(self) -> bool {
+    pub const fn reconstructible(self) -> bool {
         match self {
             FingerprintStyle::DefPathHash | FingerprintStyle::Unit | FingerprintStyle::HirId => {
                 true

compiler/rustc_query_system/src/dep_graph/serialized.rs

@@ -179,8 +179,8 @@ fn mask(bits: usize) -> usize {
 }
 
 impl SerializedDepGraph {
-    #[instrument(level = "debug", skip(d))]
+    #[instrument(level = "debug", skip(d, deps))]
-    pub fn decode<D: Deps>(d: &mut MemDecoder<'_>) -> Arc<SerializedDepGraph> {
+    pub fn decode<D: Deps>(d: &mut MemDecoder<'_>, deps: &D) -> Arc<SerializedDepGraph> {
         // The last 16 bytes are the node count and edge count.
         debug!("position: {:?}", d.position());
         let (node_count, edge_count) =
@@ -253,8 +253,9 @@ impl SerializedDepGraph {
 
         for (idx, node) in nodes.iter_enumerated() {
             if index[node.kind.as_usize()].insert(node.hash, idx).is_some() {
+                let name = deps.name(node.kind);
                 panic!(
-                    "Error: A dep graph node does not have an unique index. \
+                    "Error: A dep graph node ({name}) does not have an unique index. \
                      Running a clean build on a nightly compiler with `-Z incremental-verify-ich` \
                      can help narrow down the issue for reporting. A clean build may also work around the issue.\n
                      DepNode: {node:?}"