Auto merge of #135449 - mzacho:current-dep-graph-cfg-debug-assert, r=<try>

Add cfg(debug_assertions) to CurrentDepGraph debug fields

The change cascades down to the use sites of the fields.

After the change then `dep_graph::serialized::Stat.kind` is
dead code in non-debug builds, and it turns out it can be removed
entirely, since its value can be read from a HashMap key at the
only use site of the field.

Author: bors

compiler/rustc_incremental/src/persist/save.rs

@@ -44,6 +44,7 @@ pub(crate) fn save_dep_graph(tcx: TyCtxt<'_>) {
         sess.time("assert_dep_graph", || assert_dep_graph(tcx));
         sess.time("check_dirty_clean", || dirty_clean::check_dirty_clean_annotations(tcx));
 
+        #[cfg(debug_assertions)]
         if sess.opts.unstable_opts.incremental_info {
             tcx.dep_graph.print_incremental_info()
         }

compiler/rustc_query_system/src/dep_graph/graph.rs

@@ -11,7 +11,9 @@ use rustc_data_structures::fx::{FxHashMap, FxHashSet};
 use rustc_data_structures::profiling::{QueryInvocationId, SelfProfilerRef};
 use rustc_data_structures::sharded::{self, Sharded};
 use rustc_data_structures::stable_hasher::{HashStable, StableHasher};
-use rustc_data_structures::sync::{AtomicU32, AtomicU64, Lock, Lrc};
+#[cfg(debug_assertions)]
+use rustc_data_structures::sync::AtomicU64;
+use rustc_data_structures::sync::{AtomicU32, Lock, Lrc};
 use rustc_data_structures::unord::UnordMap;
 use rustc_index::IndexVec;
 use rustc_macros::{Decodable, Encodable};
@@ -484,9 +486,8 @@ impl<D: Deps> DepGraph<D> {
                 };
                 let task_deps = &mut *task_deps;
 
-                if cfg!(debug_assertions) {
-                    data.current.total_read_count.fetch_add(1, Ordering::Relaxed);
-                }
+                #[cfg(debug_assertions)]
+                data.current.total_read_count.fetch_add(1, Ordering::Relaxed);
 
                 // As long as we only have a low number of reads we can avoid doing a hash
                 // insert and potentially allocating/reallocating the hashmap
@@ -514,7 +515,8 @@ impl<D: Deps> DepGraph<D> {
                             }
                         }
                     }
-                } else if cfg!(debug_assertions) {
+                } else {
+                    #[cfg(debug_assertions)]
                     data.current.total_duplicate_read_count.fetch_add(1, Ordering::Relaxed);
                 }
             })
@@ -960,6 +962,7 @@ impl<D: Deps> DepGraph<D> {
         }
     }
 
+    #[cfg(debug_assertions)]
     pub fn print_incremental_info(&self) {
         if let Some(data) = &self.data {
             data.current.encoder.print_incremental_info(
@@ -1082,7 +1085,10 @@ pub(super) struct CurrentDepGraph<D: Deps> {
 
     /// These are simple counters that are for profiling and
     /// debugging and only active with `debug_assertions`.
+    #[cfg(debug_assertions)]
     total_read_count: AtomicU64,
+
+    #[cfg(debug_assertions)]
     total_duplicate_read_count: AtomicU64,
 }
 
@@ -1135,7 +1141,9 @@ impl<D: Deps> CurrentDepGraph<D> {
             forbidden_edge,
             #[cfg(debug_assertions)]
             fingerprints: Lock::new(IndexVec::from_elem_n(None, new_node_count_estimate)),
+            #[cfg(debug_assertions)]
             total_read_count: AtomicU64::new(0),
+            #[cfg(debug_assertions)]
             total_duplicate_read_count: AtomicU64::new(0),
         }
     }

compiler/rustc_query_system/src/dep_graph/serialized.rs

@@ -462,7 +462,6 @@ impl NodeInfo {
 }
 
 struct Stat {
-    kind: DepKind,
     node_counter: u64,
     edge_counter: u64,
 }
@@ -524,8 +523,7 @@ impl<D: Deps> EncoderState<D> {
 
             // Outline the stats code as it's typically disabled and cold.
             outline(move || {
-                let stat =
-                    stats.entry(kind).or_insert(Stat { kind, node_counter: 0, edge_counter: 0 });
+                let stat = stats.entry(kind).or_insert(Stat { node_counter: 0, edge_counter: 0 });
                 stat.node_counter += 1;
                 stat.edge_counter += edge_count as u64;
             });
@@ -643,6 +641,7 @@ impl<D: Deps> GraphEncoder<D> {
         }
     }
 
+    #[cfg(debug_assertions)]
     pub(crate) fn print_incremental_info(
         &self,
         total_read_count: u64,
@@ -651,8 +650,8 @@ impl<D: Deps> GraphEncoder<D> {
         let mut status = self.status.lock();
         let status = status.as_mut().unwrap();
         if let Some(record_stats) = &status.stats {
-            let mut stats: Vec<_> = record_stats.values().collect();
-            stats.sort_by_key(|s| -(s.node_counter as i64));
+            let mut stats: Vec<_> = record_stats.iter().collect();
+            stats.sort_by_key(|(_, s)| -(s.node_counter as i64));
 
             const SEPARATOR: &str = "[incremental] --------------------------------\
                                      ----------------------------------------------\
@@ -677,14 +676,14 @@ impl<D: Deps> GraphEncoder<D> {
             );
             eprintln!("{SEPARATOR}");
 
-            for stat in stats {
+            for (kind, stat) in stats {
                 let node_kind_ratio =
                     (100.0 * (stat.node_counter as f64)) / (status.total_node_count as f64);
                 let node_kind_avg_edges = (stat.edge_counter as f64) / (stat.node_counter as f64);
 
                 eprintln!(
                     "[incremental]  {:<36}|{:>16.1}% |{:>12} |{:>17.1} |",
-                    format!("{:?}", stat.kind),
+                    format!("{:?}", kind),
                     node_kind_ratio,
                     stat.node_counter,
                     node_kind_avg_edges,