From bcefd487c380b113d81ac066ea9b3b4b65e9efe7 Mon Sep 17 00:00:00 2001 From: Camille GILLOT Date: Sat, 28 Aug 2021 21:49:51 +0200 Subject: [PATCH] Comment drop_serialized_data. --- compiler/rustc_query_impl/src/on_disk_cache.rs | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/compiler/rustc_query_impl/src/on_disk_cache.rs b/compiler/rustc_query_impl/src/on_disk_cache.rs index c197962fabbe..5c2803c67e73 100644 --- a/compiler/rustc_query_impl/src/on_disk_cache.rs +++ b/compiler/rustc_query_impl/src/on_disk_cache.rs @@ -246,6 +246,11 @@ impl<'sess> rustc_middle::ty::OnDiskCache<'sess> for OnDiskCache<'sess> { } } + /// Execute all cache promotions and release the serialized backing Mmap. + /// + /// Cache promotions require invoking queries, which needs to read the serialized data. + /// In order to serialize the new on-disk cache, the former on-disk cache file needs to be + /// deleted, hence we won't be able to refer to its memmapped data. fn drop_serialized_data(&self, tcx: TyCtxt<'tcx>) { // Register any dep nodes that we reused from the previous session, // but didn't `DepNode::construct` in this session. This ensures