Auto merge of #68311 - Dylan-DPC:rollup-wzgqw9t, r=Dylan-DPC

Rollup of 4 pull requests

Successful merges:

 - #66564 (Document unsafe blocks in core::{cell, str, sync})
 - #67791 (Implement Lift using interners instead of in_arena)
 - #68278 ([self-profiler] Add example to `-Z help` to turn on query key recording)
 - #68300 (Allow added string.insert benchmarks to compile)

Failed merges:

r? @ghost

2 files changed, 16 insertions, 0 deletions

diff --git a/src/librustc_data_structures/profiling.rs b/src/librustc_data_structures/profiling.rs
index 004db0a79a8..44cef727f03 100644
--- a/src/librustc_data_structures/profiling.rs
+++ b/src/librustc_data_structures/profiling.rs
@@ -136,9 +136,11 @@ bitflags::bitflags! {
     }
 }
 
+// keep this in sync with the `-Z self-profile-events` help message in librustc_session/options.rs
 const EVENT_FILTERS_BY_NAME: &[(&str, EventFilter)] = &[
     ("none", EventFilter::NONE),
     ("all", EventFilter::ALL),
+    ("default", EventFilter::DEFAULT),
     ("generic-activity", EventFilter::GENERIC_ACTIVITIES),
     ("query-provider", EventFilter::QUERY_PROVIDERS),
     ("query-cache-hit", EventFilter::QUERY_CACHE_HITS),
diff --git a/src/librustc_data_structures/sharded.rs b/src/librustc_data_structures/sharded.rs
index 8b85d97a1d4..ee3f88ff167 100644
--- a/src/librustc_data_structures/sharded.rs
+++ b/src/librustc_data_structures/sharded.rs
@@ -137,6 +137,20 @@ impl<K: Eq + Hash + Copy> ShardedHashMap<K, ()> {
     }
 }
 
+pub trait IntoPointer {
+    /// Returns a pointer which outlives `self`.
+    fn into_pointer(&self) -> *const ();
+}
+
+impl<K: Eq + Hash + Copy + IntoPointer> ShardedHashMap<K, ()> {
+    pub fn contains_pointer_to<T: Hash + IntoPointer>(&self, value: &T) -> bool {
+        let hash = make_hash(&value);
+        let shard = self.get_shard_by_hash(hash).lock();
+        let value = value.into_pointer();
+        shard.raw_entry().from_hash(hash, |entry| entry.into_pointer() == value).is_some()
+    }
+}
+
 #[inline]
 fn make_hash<K: Hash + ?Sized>(val: &K) -> u64 {
     let mut state = FxHasher::default();