From 4c32d475a8bd2c68f82120af9182c41730a81a82 Mon Sep 17 00:00:00 2001
From: Mark Rousskov <mark.simulacrum@gmail.com>
Date: Sun, 6 Oct 2019 08:38:23 -0400
Subject: [PATCH] Remove loaded_from_cache map from DepGraph

It's now unused, even with -Zquery-dep-graph
---
 src/librustc/dep_graph/graph.rs   | 23 -----------------------
 src/librustc/ty/query/plumbing.rs |  8 --------
 2 files changed, 31 deletions(-)

diff --git a/src/librustc/dep_graph/graph.rs b/src/librustc/dep_graph/graph.rs
index 0c56fc7914b4..08c456547cec 100644
--- a/src/librustc/dep_graph/graph.rs
+++ b/src/librustc/dep_graph/graph.rs
@@ -75,9 +75,6 @@ struct DepGraphData {
     previous_work_products: FxHashMap<WorkProductId, WorkProduct>,
 
     dep_node_debug: Lock<FxHashMap<DepNode, String>>,
-
-    // Used for testing, only populated when -Zquery-dep-graph is specified.
-    loaded_from_cache: Lock<FxHashMap<DepNodeIndex, bool>>,
 }
 
 pub fn hash_result<R>(hcx: &mut StableHashingContext<'_>, result: &R) -> Option<Fingerprint>
@@ -104,7 +101,6 @@ impl DepGraph {
                 emitting_diagnostics_cond_var: Condvar::new(),
                 previous: prev_graph,
                 colors: DepNodeColorMap::new(prev_graph_node_count),
-                loaded_from_cache: Default::default(),
             })),
         }
     }
@@ -874,25 +870,6 @@ impl DepGraph {
             }
         }
     }
-
-    pub fn mark_loaded_from_cache(&self, dep_node_index: DepNodeIndex, state: bool) {
-        debug!("mark_loaded_from_cache({:?}, {})",
-               self.data.as_ref().unwrap().current.borrow().data[dep_node_index].node,
-               state);
-
-        self.data
-            .as_ref()
-            .unwrap()
-            .loaded_from_cache
-            .borrow_mut()
-            .insert(dep_node_index, state);
-    }
-
-    pub fn was_loaded_from_cache(&self, dep_node: &DepNode) -> Option<bool> {
-        let data = self.data.as_ref().unwrap();
-        let dep_node_index = data.current.borrow().node_to_node_index[dep_node];
-        data.loaded_from_cache.borrow().get(&dep_node_index).cloned()
-    }
 }
 
 /// A "work product" is an intermediate result that we save into the
diff --git a/src/librustc/ty/query/plumbing.rs b/src/librustc/ty/query/plumbing.rs
index 955f1447c55b..7cab8fe60ee6 100644
--- a/src/librustc/ty/query/plumbing.rs
+++ b/src/librustc/ty/query/plumbing.rs
@@ -489,10 +489,6 @@ impl<'tcx> TyCtxt<'tcx> {
             self.incremental_verify_ich::<Q>(&result, dep_node, dep_node_index);
         }
 
-        if unlikely!(self.sess.opts.debugging_opts.query_dep_graph) {
-            self.dep_graph.mark_loaded_from_cache(dep_node_index, true);
-        }
-
         result
     }
 
@@ -570,10 +566,6 @@ impl<'tcx> TyCtxt<'tcx> {
         drop(prof_timer);
         profq_msg!(self, ProfileQueriesMsg::ProviderEnd);
 
-        if unlikely!(self.sess.opts.debugging_opts.query_dep_graph) {
-            self.dep_graph.mark_loaded_from_cache(dep_node_index, false);
-        }
-
         if unlikely!(!diagnostics.is_empty()) {
             if dep_node.kind != crate::dep_graph::DepKind::Null {
                 self.queries.on_disk_cache