1 files changed, 71 insertions, 0 deletions
diff --git a/erts/emulator/beam/index.h b/erts/emulator/beam/index.h
new file mode 100644
index 0000000000..4eb9b1f992
--- /dev/null
+++ b/erts/emulator/beam/index.h
@@ -0,0 +1,71 @@
+/*
+ * %CopyrightBegin%
+ * 
+ * Copyright Ericsson AB 1996-2009. 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%
+ */
+
+/*
+** General hash and index functions
+** The idea behind this file was to capture the
+** way Atom,Export and Module table was implemented
+*/
+#ifndef __INDEX_H__
+#define __INDEX_H__
+
+#ifndef __HASH_H__
+#include "hash.h"
+#endif
+
+typedef struct index_slot 
+{
+    HashBucket bucket;
+    int index;
+} IndexSlot;
+
+
+typedef struct index_table
+{
+    Hash htable;		/* Mapping obj -> index */
+    ErtsAlcType_t type;
+    int size;			/* Allocated size */
+    int limit;			/* Max size */
+    int entries;		/* Number of entries */
+    IndexSlot*** seg_table;	/* Mapping index -> obj */
+} IndexTable;
+
+#define INDEX_PAGE_SHIFT 10
+#define INDEX_PAGE_SIZE (1 << INDEX_PAGE_SHIFT)
+#define INDEX_PAGE_MASK ((1 << INDEX_PAGE_SHIFT)-1)
+
+IndexTable *erts_index_init(ErtsAlcType_t,IndexTable*,char*,int,int,HashFunctions);
+void index_info(int, void *, IndexTable*);
+int index_table_sz(IndexTable *);
+
+int index_get(IndexTable*, void*);
+int index_put(IndexTable*, void*);
+void erts_index_merge(Hash*, IndexTable*);
+
+ERTS_GLB_INLINE IndexSlot* erts_index_lookup(IndexTable*, Uint);
+
+#if ERTS_GLB_INLINE_INCL_FUNC_DEF
+ERTS_GLB_INLINE IndexSlot*
+erts_index_lookup(IndexTable* t, Uint ix)
+{
+    return t->seg_table[ix>>INDEX_PAGE_SHIFT][ix&INDEX_PAGE_MASK];
+}
+#endif
+
+#endif