Delete query stats

These statistics are computable from the self-profile data and/or ad-hoc
collectable as needed, and in the meantime contribute to rustc bootstrap times.

compiler/rustc_interface/src/queries.rs

@@ -403,10 +403,6 @@ impl Compiler {
                 gcx.enter(rustc_query_impl::alloc_self_profile_query_strings);
             }
 
-            if self.session().opts.debugging_opts.query_stats {
-                gcx.enter(rustc_query_impl::print_stats);
-            }
-
             self.session()
                 .time("serialize_dep_graph", || gcx.enter(rustc_incremental::save_dep_graph));
         }

compiler/rustc_interface/src/tests.rs

@@ -684,7 +684,6 @@ fn test_debugging_options_tracking_hash() {
     untracked!(print_type_sizes, true);
     untracked!(proc_macro_backtrace, true);
     untracked!(query_dep_graph, true);
-    untracked!(query_stats, true);
     untracked!(save_analysis, true);
     untracked!(self_profile, SwitchWithOptPath::Enabled(None));
     untracked!(self_profile_events, Some(vec![String::new()]));

compiler/rustc_query_impl/src/lib.rs

@@ -28,9 +28,6 @@ mod plumbing;
 pub use plumbing::QueryCtxt;
 use rustc_query_system::query::*;
 
-mod stats;
-pub use self::stats::print_stats;
-
 mod keys;
 use keys::Key;
 

compiler/rustc_query_impl/src/stats.rs

@@ -1,112 +0,0 @@
-use rustc_hir::def_id::{DefId, LOCAL_CRATE};
-use rustc_middle::ty::query::query_storage;
-use rustc_middle::ty::TyCtxt;
-use rustc_query_system::query::{QueryCache, QueryCacheStore};
-
-use std::any::type_name;
-use std::mem;
-
-trait KeyStats {
-    fn key_stats(&self, stats: &mut QueryStats);
-}
-
-impl<T> KeyStats for T {
-    default fn key_stats(&self, _: &mut QueryStats) {}
-}
-
-impl KeyStats for DefId {
-    fn key_stats(&self, stats: &mut QueryStats) {
-        if self.krate == LOCAL_CRATE {
-            stats.local_def_id_keys = Some(stats.local_def_id_keys.unwrap_or(0) + 1);
-        }
-    }
-}
-
-#[derive(Clone)]
-struct QueryStats {
-    name: &'static str,
-    key_size: usize,
-    key_type: &'static str,
-    value_size: usize,
-    value_type: &'static str,
-    entry_count: usize,
-    local_def_id_keys: Option<usize>,
-}
-
-fn stats<C>(name: &'static str, map: &QueryCacheStore<C>) -> QueryStats
-where
-    C: QueryCache,
-{
-    let mut stats = QueryStats {
-        name,
-        key_size: mem::size_of::<C::Key>(),
-        key_type: type_name::<C::Key>(),
-        value_size: mem::size_of::<C::Value>(),
-        value_type: type_name::<C::Value>(),
-        entry_count: 0,
-        local_def_id_keys: None,
-    };
-    map.iter_results(&mut |key, _, _| {
-        stats.entry_count += 1;
-        key.key_stats(&mut stats)
-    });
-    stats
-}
-
-pub fn print_stats(tcx: TyCtxt<'_>) {
-    let queries = query_stats(tcx);
-
-    let mut query_key_sizes = queries.clone();
-    query_key_sizes.sort_by_key(|q| q.key_size);
-    eprintln!("\nLarge query keys:");
-    for q in query_key_sizes.iter().rev().filter(|q| q.key_size > 8) {
-        eprintln!("   {} - {} x {} - {}", q.name, q.key_size, q.entry_count, q.key_type);
-    }
-
-    let mut query_value_sizes = queries.clone();
-    query_value_sizes.sort_by_key(|q| q.value_size);
-    eprintln!("\nLarge query values:");
-    for q in query_value_sizes.iter().rev().filter(|q| q.value_size > 8) {
-        eprintln!("   {} - {} x {} - {}", q.name, q.value_size, q.entry_count, q.value_type);
-    }
-
-    let mut query_value_count = queries.clone();
-    query_value_count.sort_by_key(|q| q.entry_count);
-    eprintln!("\nQuery value count:");
-    for q in query_value_count.iter().rev() {
-        eprintln!("   {} - {}", q.name, q.entry_count);
-    }
-
-    let mut def_id_density: Vec<_> =
-        queries.iter().filter(|q| q.local_def_id_keys.is_some()).collect();
-    def_id_density.sort_by_key(|q| q.local_def_id_keys.unwrap());
-    eprintln!("\nLocal DefId density:");
-    let total = tcx.resolutions(()).definitions.def_index_count() as f64;
-    for q in def_id_density.iter().rev() {
-        let local = q.local_def_id_keys.unwrap();
-        eprintln!("   {} - {} = ({}%)", q.name, local, (local as f64 * 100.0) / total);
-    }
-}
-
-macro_rules! print_stats {
-    (<$tcx:tt>
-        $($(#[$attr:meta])* [$($modifiers:tt)*] fn $name:ident($K:ty) -> $V:ty,)*
-    ) => {
-        fn query_stats(tcx: TyCtxt<'_>) -> Vec<QueryStats> {
-            let mut queries = Vec::new();
-
-            $(
-                queries.push(stats::<
-                    query_storage::$name<'_>,
-                >(
-                    stringify!($name),
-                    &tcx.query_caches.$name,
-                ));
-            )*
-
-            queries
-        }
-    }
-}
-
-rustc_query_append! { [print_stats!][<'tcx>] }

compiler/rustc_session/src/options.rs

@@ -1367,8 +1367,6 @@ options! {
         "use the given `.prof` file for sampled profile-guided optimization (also known as AutoFDO)"),
     query_dep_graph: bool = (false, parse_bool, [UNTRACKED],
         "enable queries of the dependency graph for regression testing (default: no)"),
-    query_stats: bool = (false, parse_bool, [UNTRACKED],
-        "print some statistics about the query system (default: no)"),
     randomize_layout: bool = (false, parse_bool, [TRACKED],
         "randomize the layout of types (default: no)"),
     layout_seed: Option<u64> = (None, parse_opt_number, [TRACKED],