From 88fb069f83c39a47f65809ee5d6e7cadc170e56b Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Bj=C3=B6rn-Egil=20Dahlberg?= <egil@erlang.org>
Date: Wed, 30 Apr 2014 14:47:24 +0200
Subject: erts: Add erts_internal:map_to_tuple_keys/1

* Used for introspection.
* Will return the internal key tuple if applicable
* Not documented - not for public use
---
 erts/emulator/beam/erl_map.c | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

(limited to 'erts/emulator/beam/erl_map.c')

diff --git a/erts/emulator/beam/erl_map.c b/erts/emulator/beam/erl_map.c
index fdd2d0c0f6..5e740aacdd 100644
--- a/erts/emulator/beam/erl_map.c
+++ b/erts/emulator/beam/erl_map.c
@@ -58,6 +58,8 @@
  * - maps:size/1
  * - maps:without/2
  *
+ * DEBUG: for sharing calculation
+ * - erts_internal:map_to_tuple_keys/1
  */
 
 /* erlang:map_size/1
@@ -819,3 +821,17 @@ int erts_validate_and_sort_map(map_t* mp)
     }
     return 1;
 }
+
+/*
+ * erts_internal:map_to_tuple_keys/1
+ *
+ * Used in erts_debug:size/1
+ */
+
+BIF_RETTYPE erts_internal_map_to_tuple_keys_1(BIF_ALIST_1) {
+    if (is_map(BIF_ARG_1)) {
+	map_t *mp = (map_t*)map_val(BIF_ARG_1);
+	BIF_RET(mp->keys);
+    }
+    BIF_ERROR(BIF_P, BADARG);
+}
-- 
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