gc: Clear the gap byte for the no-finalisers case.

jepler · jepler · commit 794c4edab677 · 2021-09-15T13:26:03.000-05:00
Signed-off-by: Jeff Epler &lt;jepler@gmail.com&gt;
diff --git a/py/gc.c b/py/gc.c
@@ -154,7 +154,7 @@ void gc_init(void *start, void *end) {
     memset(MP_STATE_MEM(gc_finaliser_table_start), 0, gc_finaliser_table_byte_len + gc_alloc_table_byte_len + ALLOC_TABLE_GAP_BYTE);
     #else
     // clear ATBs
-    memset(MP_STATE_MEM(gc_alloc_table_start), 0, MP_STATE_MEM(gc_alloc_table_byte_len));
+    memset(MP_STATE_MEM(gc_alloc_table_start), 0, MP_STATE_MEM(gc_alloc_table_byte_len) + ALLOC_TABLE_GAP_BYTE);
     #endif
 
     // set last free ATB index to start of heap
