From: Stefan Monnier <monnier@iro.umontreal.ca>
Date: Fri, 5 Jul 2019 18:00:22 +0000 (-0400)
Subject: ; Add comment to hash_table_rehash (Bug#36447)
X-Git-Tag: emacs-27.0.90~1916
X-Git-Url: http://git.eshelyaron.com/gitweb/?a=commitdiff_plain;h=8ff09154a29a1151afb2902267ca35f89ebda73c;p=emacs.git

; Add comment to hash_table_rehash (Bug#36447)

* src/fns.c (hash_table_rehash): Add a comment to explain that
hash_table_rehash is not used in "normal" rehashing, but only in the
rare case of rehashing on the first access to a preloaded hash-table.
---

diff --git a/src/fns.c b/src/fns.c
index 238a37193c1..0497588689b 100644
--- a/src/fns.c
+++ b/src/fns.c
@@ -4231,6 +4231,11 @@ maybe_resize_hash_table (struct Lisp_Hash_Table *h)
     }
 }
 
+/* Recompute the hashes (and hence also the "next" pointers).
+   Normally there's never a need to recompute hashes.
+   This is done only on first-access to a hash-table loaded from
+   the "pdump", because the object's addresses may have changed, thus
+   affecting their hash.  */
 void
 hash_table_rehash (struct Lisp_Hash_Table *h)
 {