Assert no guard tree buffer overrun

MoarVM · Feb 18, 2020 · d3edc2b · d3edc2b
1 parent 5e7e701
commit d3edc2b
Showing 1 changed file with 1 addition and 0 deletions.
diff --git a/src/spesh/arg_guard.c b/src/spesh/arg_guard.c
@@ -372,6 +372,7 @@ void MVM_spesh_arg_guard_regenerate(MVMThreadContext *tc, MVMSpeshArgGuard **gua
     }
     for (i = 0; i < MVM_VECTOR_ELEMS(by_callsite); i++)
         add_nodes_for_callsite(tc, tree, i, candidates, by_callsite[i]);
+    assert(tree->used_nodes <= tree->num_nodes);
 
     /* Install the produced argument guard. */
     if (*guard_ptr) {