Dep/Jemalloc: Update to Jemalloc 4.0.4

(cherry picked from commit cc6dec72863a771da0c0f3ab3d32f75d7ce863bd)

1 files changed, 25 insertions, 9 deletions

diff --git a/dep/jemalloc/src/zone.c b/dep/jemalloc/src/zone.c
index e0302ef4edc..12e1734a9eb 100644
--- a/dep/jemalloc/src/zone.c
+++ b/dep/jemalloc/src/zone.c
@@ -176,6 +176,7 @@ register_zone(void)
 	 * register jemalloc's.
 	 */
 	malloc_zone_t *default_zone = malloc_default_zone();
+	malloc_zone_t *purgeable_zone = NULL;
 	if (!default_zone->zone_name ||
 	    strcmp(default_zone->zone_name, "DefaultMallocZone") != 0) {
 		return;
@@ -237,22 +238,37 @@ register_zone(void)
 	 * run time.
 	 */
 	if (malloc_default_purgeable_zone != NULL)
-		malloc_default_purgeable_zone();
+		purgeable_zone = malloc_default_purgeable_zone();
 
 	/* Register the custom zone.  At this point it won't be the default. */
 	malloc_zone_register(&zone);
 
-	/*
-	 * Unregister and reregister the default zone.  On OSX >= 10.6,
-	 * unregistering takes the last registered zone and places it at the
-	 * location of the specified zone.  Unregistering the default zone thus
-	 * makes the last registered one the default.  On OSX < 10.6,
-	 * unregistering shifts all registered zones.  The first registered zone
-	 * then becomes the default.
-	 */
 	do {
 		default_zone = malloc_default_zone();
+		/*
+		 * Unregister and reregister the default zone.  On OSX >= 10.6,
+		 * unregistering takes the last registered zone and places it
+		 * at the location of the specified zone.  Unregistering the
+		 * default zone thus makes the last registered one the default.
+		 * On OSX < 10.6, unregistering shifts all registered zones.
+		 * The first registered zone then becomes the default.
+		 */
 		malloc_zone_unregister(default_zone);
 		malloc_zone_register(default_zone);
+		/*
+		 * On OSX 10.6, having the default purgeable zone appear before
+		 * the default zone makes some things crash because it thinks it
+		 * owns the default zone allocated pointers.  We thus
+		 * unregister/re-register it in order to ensure it's always
+		 * after the default zone.  On OSX < 10.6, there is no purgeable
+		 * zone, so this does nothing.  On OSX >= 10.6, unregistering
+		 * replaces the purgeable zone with the last registered zone
+		 * above, i.e. the default zone.  Registering it again then puts
+		 * it at the end, obviously after the default zone.
+		 */
+		if (purgeable_zone) {
+			malloc_zone_unregister(purgeable_zone);
+			malloc_zone_register(purgeable_zone);
+		}
 	} while (malloc_default_zone() != &zone);
 }