Do not call BCOPY and BZERO if size is zero

* dbg_mlc.c (GC_debug_strndup): Do not call BCOPY() if elements count
is zero.
* dbg_mlc.c (GC_debug_realloc): Likewise.
* finalize.c [!GC_TOGGLE_REFS_NOT_NEEDED] (ensure_toggleref_capacity):
Likewise.
* malloc.c [REDIRECT_MALLOC && !strndup] (strndup): Likewise.
* mallocx.c (GC_strndup): Likewise.
* misc.c [!GC_GET_HEAP_USAGE_NOT_NEEDED] (GC_get_prof_stats): Likewise.
* os_dep.c [SAVE_CALL_CHAIN && GC_HAVE_BUILTIN_BACKTRACE]
(GC_save_callers): Likewise.
* reclaim.c (GC_print_all_errors): Likewise.
* malloc.c (GC_free): Do not call BZERO() if elements count is zero.
* malloc.c [THREADS] (GC_free_inner): Likewise.
* reclaim.c (GC_print_all_errors): Likewise.
* misc.c [!GC_GET_HEAP_USAGE_NOT_NEEDED && THREADS]
(GC_get_prof_stats_unsafe): Do not call fill_prof_stats() and BCOPY()
if stats_sz is zero.

1 files changed, 3 insertions, 2 deletions

diff --git a/finalize.c b/finalize.c
index bd297a9c..ad7e03b5 100644
--- a/finalize.c
+++ b/finalize.c
@@ -413,8 +413,9 @@ GC_API int GC_CALL GC_unregister_disappearing_link(void * * link)
                         NORMAL);
       if (NULL == new_array)
         return FALSE;
-      BCOPY(GC_toggleref_arr, new_array,
-            GC_toggleref_array_size * sizeof(GCToggleRef));
+      if (EXPECT(GC_toggleref_array_size > 0, TRUE))
+        BCOPY(GC_toggleref_arr, new_array,
+              GC_toggleref_array_size * sizeof(GCToggleRef));
       GC_INTERNAL_FREE(GC_toggleref_arr);
       GC_toggleref_arr = new_array;
     }