Split StableCompare trait out of StableOrd trait.

StableCompare is a companion trait to `StableOrd`. Some types like `Symbol` can be compared in a cross-session stable way, but their `Ord` implementation is not stable. In such cases, a `StableOrd` implementation can be provided to offer a lightweight way for stable sorting. (The more heavyweight option is to sort via `ToStableHashKey`, but then sorting needs to have access to a stable hashing context and `ToStableHashKey` can also be expensive as in the case of `Symbol` where it has to allocate a `String`.)

compiler/rustc_data_structures/src/stable_hasher.rs

@@ -245,6 +245,32 @@ unsafe impl<T: StableOrd> StableOrd for &T {
     const CAN_USE_UNSTABLE_SORT: bool = T::CAN_USE_UNSTABLE_SORT;
 }
 
+/// This is a companion trait to `StableOrd`. Some types like `Symbol` can be
+/// compared in a cross-session stable way, but their `Ord` implementation is
+/// not stable. In such cases, a `StableOrd` implementation can be provided
+/// to offer a lightweight way for stable sorting. (The more heavyweight option
+/// is to sort via `ToStableHashKey`, but then sorting needs to have access to
+/// a stable hashing context and `ToStableHashKey` can also be expensive as in
+/// the case of `Symbol` where it has to allocate a `String`.)
+///
+/// See the documentation of [StableOrd] for how stable sort order is defined.
+/// The same definition applies here. Be careful when implementing this trait.
+pub trait StableCompare {
+    const CAN_USE_UNSTABLE_SORT: bool;
+
+    fn stable_cmp(&self, other: &Self) -> std::cmp::Ordering;
+}
+
+/// `StableOrd` denotes that the type's `Ord` implementation is stable, so
+/// we can implement `StableCompare` by just delegating to `Ord`.
+impl<T: StableOrd> StableCompare for T {
+    const CAN_USE_UNSTABLE_SORT: bool = T::CAN_USE_UNSTABLE_SORT;
+
+    fn stable_cmp(&self, other: &Self) -> std::cmp::Ordering {
+        self.cmp(other)
+    }
+}
+
 /// Implement HashStable by just calling `Hash::hash()`. Also implement `StableOrd` for the type since
 /// that has the same requirements.
 ///

compiler/rustc_data_structures/src/unord.rs

@@ -14,7 +14,7 @@ use std::{
 
 use crate::{
     fingerprint::Fingerprint,
-    stable_hasher::{HashStable, StableHasher, StableOrd, ToStableHashKey},
+    stable_hasher::{HashStable, StableCompare, StableHasher, ToStableHashKey},
 };
 
 /// `UnordItems` is the order-less version of `Iterator`. It only contains methods
@@ -134,7 +134,7 @@ impl<'a, T: Copy + 'a, I: Iterator<Item = &'a T>> UnordItems<&'a T, I> {
     }
 }
 
-impl<T: Ord, I: Iterator<Item = T>> UnordItems<T, I> {
+impl<T, I: Iterator<Item = T>> UnordItems<T, I> {
     pub fn into_sorted<HCX>(self, hcx: &HCX) -> Vec<T>
     where
         T: ToStableHashKey<HCX>,
@@ -147,13 +147,36 @@ impl<T: Ord, I: Iterator<Item = T>> UnordItems<T, I> {
     #[inline]
     pub fn into_sorted_stable_ord(self) -> Vec<T>
     where
-        T: Ord + StableOrd,
+        T: StableCompare,
     {
         let mut items: Vec<T> = self.0.collect();
         if !T::CAN_USE_UNSTABLE_SORT {
-            items.sort();
+            items.sort_by(T::stable_cmp);
         } else {
-            items.sort_unstable()
+            items.sort_unstable_by(T::stable_cmp)
+        }
+        items
+    }
+
+    #[inline]
+    pub fn into_sorted_stable_ord_by_key<K, C>(self, project_to_key: C) -> Vec<T>
+    where
+        K: StableCompare,
+        C: for<'a> Fn(&'a T) -> &'a K,
+    {
+        let mut items: Vec<T> = self.0.collect();
+        if !K::CAN_USE_UNSTABLE_SORT {
+            items.sort_by(|a, b| {
+                let a_key = project_to_key(a);
+                let b_key = project_to_key(b);
+                a_key.stable_cmp(b_key)
+            });
+        } else {
+            items.sort_unstable_by(|a, b| {
+                let a_key = project_to_key(a);
+                let b_key = project_to_key(b);
+                a_key.stable_cmp(b_key)
+            });
         }
         items
     }
@@ -268,16 +291,30 @@ impl<V: Eq + Hash> UnordSet<V> {
     }
 
     /// Returns the items of this set in stable sort order (as defined by
-    /// `StableOrd`). This method is much more efficient than
+    /// `StableCompare`). This method is much more efficient than
     /// `into_sorted` because it does not need to transform keys to their
     /// `ToStableHashKey` equivalent.
     #[inline]
-    pub fn to_sorted_stable_ord(&self) -> Vec<V>
+    pub fn to_sorted_stable_ord(&self) -> Vec<&V>
     where
-        V: Ord + StableOrd + Clone,
+        V: StableCompare,
     {
-        let mut items: Vec<V> = self.inner.iter().cloned().collect();
-        items.sort_unstable();
+        let mut items: Vec<&V> = self.inner.iter().collect();
+        items.sort_unstable_by(|a, b| a.stable_cmp(*b));
+        items
+    }
+
+    /// Returns the items of this set in stable sort order (as defined by
+    /// `StableCompare`). This method is much more efficient than
+    /// `into_sorted` because it does not need to transform keys to their
+    /// `ToStableHashKey` equivalent.
+    #[inline]
+    pub fn into_sorted_stable_ord(self) -> Vec<V>
+    where
+        V: StableCompare,
+    {
+        let mut items: Vec<V> = self.inner.into_iter().collect();
+        items.sort_unstable_by(V::stable_cmp);
         items
     }
 
@@ -483,16 +520,16 @@ impl<K: Eq + Hash, V> UnordMap<K, V> {
         to_sorted_vec(hcx, self.inner.iter(), cache_sort_key, |&(k, _)| k)
     }
 
-    /// Returns the entries of this map in stable sort order (as defined by `StableOrd`).
+    /// Returns the entries of this map in stable sort order (as defined by `StableCompare`).
     /// This method can be much more efficient than `into_sorted` because it does not need
     /// to transform keys to their `ToStableHashKey` equivalent.
     #[inline]
-    pub fn to_sorted_stable_ord(&self) -> Vec<(K, &V)>
+    pub fn to_sorted_stable_ord(&self) -> Vec<(&K, &V)>
     where
-        K: Ord + StableOrd + Copy,
+        K: StableCompare,
     {
-        let mut items: Vec<(K, &V)> = self.inner.iter().map(|(&k, v)| (k, v)).collect();
-        items.sort_unstable_by_key(|&(k, _)| k);
+        let mut items: Vec<_> = self.inner.iter().collect();
+        items.sort_unstable_by(|(a, _), (b, _)| a.stable_cmp(*b));
         items
     }
 
@@ -510,6 +547,19 @@ impl<K: Eq + Hash, V> UnordMap<K, V> {
         to_sorted_vec(hcx, self.inner.into_iter(), cache_sort_key, |(k, _)| k)
     }
 
+    /// Returns the entries of this map in stable sort order (as defined by `StableCompare`).
+    /// This method can be much more efficient than `into_sorted` because it does not need
+    /// to transform keys to their `ToStableHashKey` equivalent.
+    #[inline]
+    pub fn into_sorted_stable_ord(self) -> Vec<(K, V)>
+    where
+        K: StableCompare,
+    {
+        let mut items: Vec<(K, V)> = self.inner.into_iter().collect();
+        items.sort_unstable_by(|a, b| a.0.stable_cmp(&b.0));
+        items
+    }
+
     /// Returns the values of this map in stable sort order (as defined by K's
     /// `ToStableHashKey` implementation).
     ///

compiler/rustc_hir_typeck/src/method/suggest.rs

@@ -913,7 +913,7 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
             for ((span, add_where_or_comma), obligations) in type_params.into_iter() {
                 restrict_type_params = true;
                 // #74886: Sort here so that the output is always the same.
-                let obligations = obligations.to_sorted_stable_ord();
+                let obligations = obligations.into_sorted_stable_ord();
                 err.span_suggestion_verbose(
                     span,
                     format!(

compiler/rustc_hir_typeck/src/upvar.rs

@@ -912,7 +912,7 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
         drop_order: bool,
     ) -> MigrationWarningReason {
         MigrationWarningReason {
-            auto_traits: auto_trait_reasons.to_sorted_stable_ord(),
+            auto_traits: auto_trait_reasons.into_sorted_stable_ord(),
             drop_order,
         }
     }

compiler/rustc_hir_typeck/src/writeback.rs

@@ -473,7 +473,7 @@ impl<'cx, 'tcx> WritebackCx<'cx, 'tcx> {
         assert_eq!(fcx_typeck_results.hir_owner, self.typeck_results.hir_owner);
 
         let fcx_coercion_casts = fcx_typeck_results.coercion_casts().to_sorted_stable_ord();
-        for local_id in fcx_coercion_casts {
+        for &local_id in fcx_coercion_casts {
             self.typeck_results.set_coercion_cast(local_id);
         }
     }

compiler/rustc_incremental/src/persist/save.rs

@@ -103,7 +103,7 @@ pub fn save_work_product_index(
     // deleted during invalidation. Some object files don't change their
     // content, they are just not needed anymore.
     let previous_work_products = dep_graph.previous_work_products();
-    for (id, wp) in previous_work_products.to_sorted_stable_ord().iter() {
+    for (id, wp) in previous_work_products.to_sorted_stable_ord() {
         if !new_work_products.contains_key(id) {
             work_product::delete_workproduct_files(sess, wp);
             debug_assert!(

compiler/rustc_lint_defs/src/lib.rs

@@ -9,7 +9,9 @@ pub use self::Level::*;
 use rustc_ast::node_id::NodeId;
 use rustc_ast::{AttrId, Attribute};
 use rustc_data_structures::fx::{FxIndexMap, FxIndexSet};
-use rustc_data_structures::stable_hasher::{HashStable, StableHasher, ToStableHashKey};
+use rustc_data_structures::stable_hasher::{
+    HashStable, StableCompare, StableHasher, ToStableHashKey,
+};
 use rustc_error_messages::{DiagnosticMessage, MultiSpan};
 use rustc_hir::HashStableContext;
 use rustc_hir::HirId;
@@ -541,6 +543,14 @@ impl<HCX> ToStableHashKey<HCX> for LintId {
     }
 }
 
+impl StableCompare for LintId {
+    const CAN_USE_UNSTABLE_SORT: bool = true;
+
+    fn stable_cmp(&self, other: &Self) -> std::cmp::Ordering {
+        self.lint_name_raw().cmp(&other.lint_name_raw())
+    }
+}
+
 #[derive(Debug)]
 pub struct AmbiguityErrorDiag {
     pub msg: String,

compiler/rustc_middle/src/ty/typeck_results.rs

@@ -527,7 +527,7 @@ impl<'a, V> LocalTableInContext<'a, V> {
     }
 
     pub fn items_in_stable_order(&self) -> Vec<(ItemLocalId, &'a V)> {
-        self.data.to_sorted_stable_ord()
+        self.data.items().map(|(&k, v)| (k, v)).into_sorted_stable_ord_by_key(|(k, _)| k)
     }
 }
 

compiler/rustc_span/src/symbol.rs

@@ -4,7 +4,9 @@
 
 use rustc_arena::DroplessArena;
 use rustc_data_structures::fx::FxIndexSet;
-use rustc_data_structures::stable_hasher::{HashStable, StableHasher, ToStableHashKey};
+use rustc_data_structures::stable_hasher::{
+    HashStable, StableCompare, StableHasher, ToStableHashKey,
+};
 use rustc_data_structures::sync::Lock;
 use rustc_macros::HashStable_Generic;
 use rustc_serialize::{Decodable, Decoder, Encodable, Encoder};
@@ -2103,6 +2105,14 @@ impl<CTX> ToStableHashKey<CTX> for Symbol {
     }
 }
 
+impl StableCompare for Symbol {
+    const CAN_USE_UNSTABLE_SORT: bool = true;
+
+    fn stable_cmp(&self, other: &Self) -> std::cmp::Ordering {
+        self.as_str().cmp(other.as_str())
+    }
+}
+
 pub(crate) struct Interner(Lock<InternerInner>);
 
 // The `&'static str`s in this type actually point into the arena.