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-rw-r--r--erts/preloaded/src/erts_internal.erl19
1 files changed, 18 insertions, 1 deletions
diff --git a/erts/preloaded/src/erts_internal.erl b/erts/preloaded/src/erts_internal.erl
index 2c5bd82cf0..5756d80424 100644
--- a/erts/preloaded/src/erts_internal.erl
+++ b/erts/preloaded/src/erts_internal.erl
@@ -30,7 +30,7 @@
-export([await_port_send_result/3]).
-export([cmp_term/2]).
--export([map_to_tuple_keys/1]).
+-export([map_to_tuple_keys/1, map_type/1, map_hashmap_children/1]).
-export([port_command/3, port_connect/2, port_close/1,
port_control/3, port_call/3, port_info/1, port_info/2]).
@@ -178,3 +178,20 @@ cmp_term(_A,_B) ->
map_to_tuple_keys(_M) ->
erlang:nif_error(undefined).
+
+%% return the internal map type
+-spec map_type(M) -> Type when
+ M :: map(),
+ Type :: 'flatmap' | 'hashmap' | 'hashmap_node'.
+
+map_type(_M) ->
+ erlang:nif_error(undefined).
+
+%% return the internal hashmap sub-nodes from
+%% a hashmap node
+-spec map_hashmap_children(M) -> Children when
+ M :: map(), %% hashmap node
+ Children :: [map() | nonempty_improper_list(term(),term())].
+
+map_hashmap_children(_M) ->
+ erlang:nif_error(undefined).