erts: Refactor enif_phash2 into enif_hash

A more generic hashing function which can also hash terms based on
`make_internal_hash'.

1 files changed, 35 insertions, 14 deletions

diff --git a/erts/doc/src/erl_nif.xml b/erts/doc/src/erl_nif.xml
index 35c42ac517..53b6fdeaa1 100644
--- a/erts/doc/src/erl_nif.xml
+++ b/erts/doc/src/erl_nif.xml
@@ -813,6 +813,28 @@ typedef enum {
           </item>
         </taglist>
       </item>
+      <tag><marker id="ErlNifHash"/><c>ErlNifHash</c></tag>
+      <item>
+        <p>An enumeration of the supported hash types that can be generated
+          using <seealso marker="#enif_hash"><c>enif_hash</c></seealso>.
+        </p>
+        <taglist>
+          <tag><c>ERL_NIF_INTERNAL_HASH</c></tag>
+          <item>
+            <p>Non-portable hash function that gives different hashes for the same Erlang
+              term depending on machine architecture and ERTS version.</p>
+            <p>Generated hash values within <c>0..2^32-1</c>.</p>
+          </item>
+          <tag><c>ERL_NIF_PHASH2</c></tag>
+          <item>
+            <p>Portable hash function that gives the same hash for the same Erlang term
+              regardless of machine architecture and ERTS version. Corresponds to
+              <seealso marker="erlang#phash2-1"><c>erlang:phash2/1</c></seealso>.</p>
+            <p>Slower than <c>ERL_NIF_INTERNAL_HASH.</c></p>
+            <p>Generated hash values within <c>0..2^27-1</c>.</p>
+          </item>
+        </taglist>
+      </item>
     </taglist>
   </section>
 
@@ -1387,6 +1409,19 @@ typedef enum {
     </func>
 
     <func>
+      <name>
+        <ret>unsigned long</ret>
+        <nametext>enif_hash(ErlNifHash type, ERL_NIF_TERM term)</nametext>
+      </name>
+      <fsummary>Hash terms.</fsummary>
+      <desc>
+        <p>Hash terms according to the specified
+          <seealso marker="#ErlNifHash"><c>ErlNifHash</c></seealso> type.</p>
+        <p>Range of returned value depends on the hash type.</p>
+      </desc>
+    </func>
+
+    <func>
       <name><ret>int</ret><nametext>enif_inspect_binary(ErlNifEnv* env,
         ERL_NIF_TERM bin_term, ErlNifBinary* bin)</nametext></name>
       <fsummary>Inspect the content of a binary.</fsummary>
@@ -2370,20 +2405,6 @@ enif_map_iterator_destroy(env, &amp;iter);</code>
     </func>
 
     <func>
-      <name>
-        <ret>unsigned long</ret>
-        <nametext>enif_phash2(ERL_NIF_TERM term)</nametext>
-      </name>
-      <fsummary>Portable hash function.</fsummary>
-      <desc>
-        <p>Portable hash function that gives the same hash for the same Erlang term
-          regardless of machine architecture and ERTS version. Corresponds to
-          <seealso marker="erlang#phash2-1"><c>erlang:phash2/1</c></seealso>.</p>
-        <p>Returns an unsigned integer within <c>0..2^27-1</c>.</p>
-      </desc>
-    </func>
-
-    <func>
      <name><ret>int</ret><nametext>enif_port_command(ErlNifEnv* env, const
        ErlNifPort* to_port, ErlNifEnv *msg_env, ERL_NIF_TERM msg)</nametext>
      </name>