erts: Initial Map instructions, type and structure

1 files changed, 64 insertions, 0 deletions

diff --git a/erts/emulator/beam/erl_map.h b/erts/emulator/beam/erl_map.h
new file mode 100644
index 0000000000..ca8ce0f974
--- /dev/null
+++ b/erts/emulator/beam/erl_map.h
@@ -0,0 +1,64 @@
+/*
+ * %CopyrightBegin%
+ * 
+ * Copyright Ericsson AB 2013. All Rights Reserved.
+ * 
+ * The contents of this file are subject to the Erlang Public License,
+ * Version 1.1, (the "License"); you may not use this file except in
+ * compliance with the License. You should have received a copy of the
+ * Erlang Public License along with this software. If not, it can be
+ * retrieved online at http://www.erlang.org/.
+ * 
+ * Software distributed under the License is distributed on an "AS IS"
+ * basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See
+ * the License for the specific language governing rights and limitations
+ * under the License.
+ * 
+ * %CopyrightEnd%
+ */
+
+
+#ifndef __ERL_MAP_H__
+#define __ERL_MAP_H__
+
+#include "sys.h"
+/* MAP */
+
+typedef struct map_s {
+    Eterm thing_word;
+    Uint  size;
+    Eterm keys;      /* tuple */
+} map_t;
+/* map node
+ *
+ * -----------
+ * Eterm   THING	
+ * Eterm   Keys -> {K1, K2, K3, ..., Kn} where n = arity
+ * ----
+ * Eterm   V1
+ * ...
+ * Eterm   Vn, where n = arity
+ * -----------
+ */
+
+
+
+/* erl_term.h stuff */
+#define make_map(x)		make_boxed((Eterm*)(x))
+#define make_map_rel(x, BASE)   make_boxed_rel((Eterm*)(x),(BASE))
+#define is_map(x)		(is_boxed((x)) && is_map_header(*boxed_val((x))))
+#define is_map_rel(RTERM,BASE)  is_map(rterm2wterm(RTERM,BASE))
+#define is_not_map(x)           (!is_map((x)))
+#define is_map_header(x)	(((x) & (_TAG_HEADER_MASK)) == _TAG_HEADER_MAP)
+#define header_is_map(x)        ((((x) & (_HEADER_SUBTAG_MASK)) == MAP_SUBTAG))
+#define map_val(x)		(_unchecked_boxed_val((x)))
+#define map_val_rel(RTERM, BASE) map_val(rterm2wterm(RTERM, BASE))
+
+#define map_get_values(x)      (((Eterm *)(x)) + 3)
+#define map_get_keys(x)        (((Eterm *)tuple_val(((map_t *)(x))->keys)) + 1)
+#define map_get_size(x)        (((map_t*)(x))->size)
+
+#define MAP_HEADER             _make_header(1,_TAG_HEADER_MAP)
+
+#endif
+