OTP-8561: A minor compiler related performance improvement.

1 files changed, 265 insertions, 136 deletions

diff --git a/lib/megaco/src/engine/megaco_config.erl b/lib/megaco/src/engine/megaco_config.erl
index 1c7a141be7..0445f10838 100644
--- a/lib/megaco/src/engine/megaco_config.erl
+++ b/lib/megaco/src/engine/megaco_config.erl
@@ -224,149 +224,278 @@ update_user_info(UserMid, orig_pending_limit, Val) ->
 update_user_info(UserMid, Item, Val) ->
     call({update_user_info, UserMid, Item, Val}).
 
-conn_info(CH, Item) 
-  when is_record(CH, megaco_conn_handle) andalso (Item /= cancel) ->
-    case Item of
-        conn_handle ->
-            CH;
-        mid ->
-            CH#megaco_conn_handle.local_mid;
-        local_mid ->
-            CH#megaco_conn_handle.local_mid;
-        remote_mid ->
-            CH#megaco_conn_handle.remote_mid;
-        conn_data ->
-            case lookup_local_conn(CH) of
-                [] ->
-                    exit({no_such_connection, CH});
-                [ConnData] ->
-                    ConnData
-            end;
-        _ ->
-            case lookup_local_conn(CH) of
-                [] ->
-                    exit({no_such_connection, CH});
-                [ConnData] ->
-                    conn_info(ConnData, Item)
-            end
+
+conn_info(Data, Item) ->
+    %% The purpose of this is a compiler optimization...
+    %% Args are processed from left to right.
+    do_conn_info(Item, Data).
+
+do_conn_info(mid = _Item, #megaco_conn_handle{local_mid = Mid}) ->
+    Mid;
+do_conn_info(local_mid = _Item, #megaco_conn_handle{local_mid = LMid}) ->
+    LMid;
+do_conn_info(remote_mid = _Item, #megaco_conn_handle{remote_mid = RMid}) ->
+    RMid;
+do_conn_info(conn_handle = _Item, CH) when is_record(CH, megaco_conn_handle) ->
+    CH;
+do_conn_info(conn_data = _Item, CH) when is_record(CH, megaco_conn_handle) ->
+    case lookup_local_conn(CH) of
+	[] ->
+	    exit({no_such_connection, CH});
+	[ConnData] ->
+	    ConnData
+    end;
+do_conn_info(Item, CH) when is_record(CH, megaco_conn_handle) ->
+    case lookup_local_conn(CH) of
+	[] ->
+	    exit({no_such_connection, CH});
+	[ConnData] ->
+	    do_conn_info(Item, ConnData)
     end;
-conn_info(#conn_data{conn_handle = CH}, cancel) ->
+
+do_conn_info(cancel = _Item, #conn_data{conn_handle = CH}) ->
+    %% To minimise raise-condition propabillity,
+    %% we always look in the table instead of
+    %% in the record for this one
+    ets:lookup_element(megaco_local_conn, CH, #conn_data.cancel);
+do_conn_info(cancel = _Item, CH) when is_record(CH, megaco_conn_handle) ->
     %% To minimise raise-condition propabillity,
     %% we always look in the table instead of
     %% in the record for this one
     ets:lookup_element(megaco_local_conn, CH, #conn_data.cancel);
 
-conn_info(CD, Item) when is_record(CD, conn_data) ->
-    case Item of
-	all ->
-	    Tags0 = record_info(fields, conn_data),
-	    Tags1 = replace(serial, trans_id, Tags0),
-	    Tags  = [mid, local_mid, remote_mid] ++ 
-		replace(max_serial, max_trans_id, Tags1),
-	    [{Tag, conn_info(CD,Tag)} || Tag <- Tags, 
-					 Tag /= conn_data, 
-					 Tag /= trans_sender,
-					 Tag /= cancel];
-        conn_data          -> CD;
-        conn_handle        -> CD#conn_data.conn_handle;
-        mid                -> (CD#conn_data.conn_handle)#megaco_conn_handle.local_mid;
-        local_mid          -> (CD#conn_data.conn_handle)#megaco_conn_handle.local_mid;
-        remote_mid         -> (CD#conn_data.conn_handle)#megaco_conn_handle.remote_mid;
-        trans_id           -> CH       = CD#conn_data.conn_handle, 
-			      LocalMid = CH#megaco_conn_handle.local_mid,
-			      Item2    = {LocalMid, trans_id_counter},
-			      case (catch ets:lookup(megaco_config, Item2)) of
-				  {'EXIT', _} ->
-				      undefined_serial;
-				  [] ->
-				      user_info(LocalMid, min_trans_id);
-				  [{_, Serial}] ->
-				      Max = CD#conn_data.max_serial,
-				      if
-					  ((Max =:= infinity) andalso 
-					   is_integer(Serial) andalso 
-					   (Serial < 4294967295)) ->
-					      Serial + 1;
-					  (Max =:= infinity) andalso  
-					  is_integer(Serial) andalso 
-					  (Serial =:= 4294967295) ->
-					      user_info(LocalMid, 
-							min_trans_id);
-					  Serial < Max ->
-					      Serial  + 1;
-					  Serial =:= Max ->
-					      user_info(LocalMid, 
-							min_trans_id);
-					  Serial =:= 4294967295 ->
-					      user_info(LocalMid, 
-							min_trans_id);
-					  true ->
-					      undefined_serial
-				      end
-			      end;
-        max_trans_id         -> CD#conn_data.max_serial;
-        request_timer        -> CD#conn_data.request_timer;
-        long_request_timer   -> CD#conn_data.long_request_timer;
-
-        auto_ack             -> CD#conn_data.auto_ack;
-
-        trans_ack            -> CD#conn_data.trans_ack;
-        trans_ack_maxcount   -> CD#conn_data.trans_ack_maxcount;
-
-        trans_req            -> CD#conn_data.trans_req;
-        trans_req_maxcount   -> CD#conn_data.trans_req_maxcount;
-        trans_req_maxsize    -> CD#conn_data.trans_req_maxsize;
-
-        trans_timer          -> CD#conn_data.trans_timer;
-
-        pending_timer        -> CD#conn_data.pending_timer;
-        orig_pending_limit   -> CD#conn_data.sent_pending_limit;
-        sent_pending_limit   -> CD#conn_data.sent_pending_limit;
-        recv_pending_limit   -> CD#conn_data.recv_pending_limit;
-        reply_timer          -> CD#conn_data.reply_timer;
-        control_pid          -> CD#conn_data.control_pid;
-        monitor_ref          -> CD#conn_data.monitor_ref;
-        send_mod             -> CD#conn_data.send_mod;
-        send_handle          -> CD#conn_data.send_handle;
-        encoding_mod         -> CD#conn_data.encoding_mod;
-        encoding_config      -> CD#conn_data.encoding_config;
-        protocol_version     -> CD#conn_data.protocol_version;
-        auth_data            -> CD#conn_data.auth_data;
-        user_mod             -> CD#conn_data.user_mod;
-        user_args            -> CD#conn_data.user_args;
-        reply_action         -> CD#conn_data.reply_action;
-        reply_data           -> CD#conn_data.reply_data;
-        threaded             -> CD#conn_data.threaded;
-        strict_version       -> CD#conn_data.strict_version;
-	long_request_resend  -> CD#conn_data.long_request_resend;
-	call_proxy_gc_timeout -> CD#conn_data.call_proxy_gc_timeout;
-	cancel               -> CD#conn_data.cancel;
-	resend_indication    -> CD#conn_data.resend_indication;
-	segment_reply_ind    -> CD#conn_data.segment_reply_ind;
-	segment_recv_acc     -> CD#conn_data.segment_recv_acc;
-	segment_recv_timer   -> CD#conn_data.segment_recv_timer;
-	segment_send         -> CD#conn_data.segment_send;
-	segment_send_timer   -> CD#conn_data.segment_send_timer;
-	max_pdu_size         -> CD#conn_data.max_pdu_size;
-	request_keep_alive_timeout -> CD#conn_data.request_keep_alive_timeout;
-        receive_handle       ->
-            LocalMid = (CD#conn_data.conn_handle)#megaco_conn_handle.local_mid,
-            #megaco_receive_handle{local_mid       = LocalMid,
-                                   encoding_mod    = CD#conn_data.encoding_mod,
-                                   encoding_config = CD#conn_data.encoding_config,
-                                   send_mod        = CD#conn_data.send_mod};
-        _ ->
-            exit({no_such_item, Item})
+do_conn_info(all = _Item, 
+	     #conn_data{conn_handle                = CH,
+			serial                     = TransId,
+			max_serial                 = MaxTransId,
+			request_timer              = ReqTmr,
+			long_request_timer         = LongReqTmr,
+			auto_ack                   = AutoAck,
+			trans_ack                  = TransAck,
+			trans_ack_maxcount         = TransAckMaxCount,
+			trans_req                  = TransReq, 
+			trans_req_maxcount         = TransReqMaxCount, 
+			trans_req_maxsize          = TransReqMaxSz, 
+			trans_timer                = TransTmr, 
+			%% trans_sender,   
+			pending_timer              = PendingTmr,
+			sent_pending_limit         = SentPendingLimit, 
+			recv_pending_limit         = RecvPendingLimit, 
+			reply_timer                = ReplyTmr,
+			control_pid                = CtrlPid,
+			monitor_ref                = MonRef,
+			send_mod                   = SendMod,
+			send_handle                = SendHandle,
+			encoding_mod               = EncodingMod,
+			encoding_config            = EncodingConf,
+			protocol_version           = ProtoVersion,
+			auth_data                  = AuthData,
+			user_mod                   = UserMod,
+			user_args                  = UserArgs,
+			reply_action               = ReplyAction, 
+			reply_data                 = ReplyData, 
+			threaded                   = Threaded, 
+			strict_version             = StrictVersion, 
+			long_request_resend        = LongReqResend, 
+			call_proxy_gc_timeout      = CallProxyGCTimeout, 
+			%% cancel, 
+			resend_indication          = ResendInd, 
+			segment_reply_ind          = SegReplyInd, 
+			segment_recv_acc           = SegRecvAcc, 
+			segment_recv_timer         = SegRecvTmr, 
+			segment_send               = SegSend, 
+			segment_send_timer         = SegSendTmr, 
+			max_pdu_size               = MaxPduSz, 
+			request_keep_alive_timeout = RequestKeepAliveTmr}) ->
+    [{conn_handle,                CH}, 
+     {trans_id,                   TransId}, 
+     {max_trans_id,               MaxTransId},
+     {request_timer,              ReqTmr},
+     {long_request_timer,         LongReqTmr},
+     {mid,                        CH#megaco_conn_handle.local_mid},
+     {local_mid,                  CH#megaco_conn_handle.local_mid},
+     {remote_mid,                 CH#megaco_conn_handle.remote_mid},
+     {auto_ack,                   AutoAck},
+     {trans_ack,                  TransAck},
+     {trans_ack_maxcount,         TransAckMaxCount},
+     {trans_req,                  TransReq}, 
+     {trans_req_maxcount,         TransReqMaxCount}, 
+     {trans_req_maxsize,          TransReqMaxSz}, 
+     {trans_timer,                TransTmr}, 
+     {pending_timer,              PendingTmr},
+     {sent_pending_limit,         SentPendingLimit}, 
+     {recv_pending_limit,         RecvPendingLimit}, 
+     {reply_timer,                ReplyTmr},
+     {control_pid,                CtrlPid},
+     {monitor_ref,                MonRef},
+     {send_mod,                   SendMod},
+     {send_handle,                SendHandle},
+     {encoding_mod,               EncodingMod},
+     {encoding_config,            EncodingConf},
+     {protocol_version,           ProtoVersion},
+     {auth_data,                  AuthData},
+     {user_mod,                   UserMod},
+     {user_args,                  UserArgs},
+     {reply_action,               ReplyAction}, 
+     {reply_data,                 ReplyData}, 
+     {threaded,                   Threaded}, 
+     {strict_version,             StrictVersion}, 
+     {long_request_resend,        LongReqResend}, 
+     {call_proxy_gc_timeout,      CallProxyGCTimeout}, 
+     {resend_indication,          ResendInd}, 
+     {segment_reply_ind,          SegReplyInd}, 
+     {segment_recv_acc,           SegRecvAcc}, 
+     {segment_recv_timer,         SegRecvTmr}, 
+     {segment_send,               SegSend}, 
+     {segment_send_timer,         SegSendTmr}, 
+     {max_pdu_size,               MaxPduSz}, 
+     {request_keep_alive_timeout, RequestKeepAliveTmr}];
+
+do_conn_info(conn_data = _Item, CD) ->
+    CD;
+do_conn_info(conn_handle = _Item, #conn_data{conn_handle = Val}) ->
+    Val;
+do_conn_info(mid = _Item, 
+	     #conn_data{conn_handle = #megaco_conn_handle{local_mid = Val}}) ->
+    Val;
+do_conn_info(local_mid = _Item, 
+	     #conn_data{conn_handle = #megaco_conn_handle{local_mid = Val}}) ->
+    Val;
+do_conn_info(remote_mid = _Item, 
+	     #conn_data{conn_handle = #megaco_conn_handle{remote_mid = Val}}) ->
+    Val;
+do_conn_info(trans_id = _Item, 
+	     #conn_data{conn_handle = #megaco_conn_handle{local_mid = LMid},
+			max_serial  = Max}) ->
+    Item2 = {LMid, trans_id_counter},
+    case (catch ets:lookup(megaco_config, Item2)) of
+	{'EXIT', _} ->
+	    undefined_serial;
+	[] ->
+	    user_info(LMid, min_trans_id);
+	[{_, Serial}] ->
+	    if
+		((Max =:= infinity) andalso 
+		 is_integer(Serial) andalso 
+		 (Serial < 4294967295)) ->
+		    Serial + 1;
+		((Max =:= infinity) andalso  
+		 is_integer(Serial) andalso 
+		 (Serial =:= 4294967295)) ->
+		    user_info(LMid, min_trans_id);
+		Serial < Max ->
+		    Serial  + 1;
+		Serial =:= Max ->
+		    user_info(LMid, min_trans_id);
+		Serial =:= 4294967295 ->
+		    user_info(LMid, min_trans_id);
+		true ->
+		    undefined_serial
+	    end
     end;
-conn_info(BadHandle, _Item) ->
-    {error, {no_such_connection, BadHandle}}.
-
-replace(_, _, []) ->
-    [];
-replace(Item, WithItem, [Item|List]) ->
-    [WithItem|List];
-replace(Item, WithItem, [OtherItem|List]) ->
-    [OtherItem | replace(Item, WithItem, List)].
+do_conn_info(max_trans_id = _Item, #conn_data{max_serial = Val}) ->
+    Val;
+do_conn_info(request_timer = _Item, #conn_data{request_timer = Val}) ->
+    Val;
+do_conn_info(long_request_timer = _Item, #conn_data{long_request_timer = Val}) ->
+    Val;
+do_conn_info(auto_ack = _Item, #conn_data{auto_ack = Val}) ->
+    Val;
+do_conn_info(trans_ack = _Item, #conn_data{trans_ack = Val}) ->
+    Val;
+do_conn_info(trans_ack_maxcount = _Item, #conn_data{trans_ack_maxcount = Val}) ->
+    Val;
+do_conn_info(trans_req = _Item, #conn_data{trans_req = Val}) ->
+    Val;
+do_conn_info(trans_req_maxcount = _Item, #conn_data{trans_req_maxcount = Val}) ->
+    Val;
+do_conn_info(trans_req_maxsize = _Item, #conn_data{trans_req_maxsize = Val}) ->
+    Val;
+do_conn_info(trans_timer = _Item, #conn_data{trans_timer = Val}) ->
+    Val;
+do_conn_info(pending_timer = _Item, #conn_data{pending_timer = Val}) ->
+    Val;
+do_conn_info(orig_pending_limit = _Item, #conn_data{sent_pending_limit = Val}) ->
+    Val;
+do_conn_info(sent_pending_limit = _Item, #conn_data{sent_pending_limit = Val}) ->
+    Val;
+do_conn_info(recv_pending_limit = _Item, #conn_data{recv_pending_limit = Val}) ->
+    Val;
+do_conn_info(reply_timer = _Item, #conn_data{reply_timer = Val}) ->
+    Val;
+do_conn_info(control_pid = _Item, #conn_data{control_pid = Val}) ->
+    Val;
+do_conn_info(send_mod = _Item, #conn_data{send_mod = Val}) ->
+    Val;
+do_conn_info(send_handle = _Item, #conn_data{send_handle = Val}) ->
+    Val;
+do_conn_info(encoding_mod = _Item, #conn_data{encoding_mod = Val}) ->
+    Val;
+do_conn_info(encoding_config = _Item, #conn_data{encoding_config = Val}) ->
+    Val;
+do_conn_info(protocol_version = _Item, #conn_data{protocol_version = Val}) ->
+    Val;
+do_conn_info(auth_data = _Item, #conn_data{auth_data = Val}) ->
+    Val;
+do_conn_info(user_mod = _Item, #conn_data{user_mod = Val}) ->
+    Val;
+do_conn_info(user_args = _Item, #conn_data{user_args = Val}) ->
+    Val;
+do_conn_info(reply_action = _Item, #conn_data{reply_action = Val}) ->
+    Val;
+do_conn_info(reply_data = _Item, #conn_data{reply_data = Val}) ->
+    Val;
+do_conn_info(threaded = _Item, #conn_data{threaded = Val}) ->
+    Val;
+do_conn_info(strict_version = _Item, #conn_data{strict_version = Val}) ->
+    Val;
+do_conn_info(long_request_resend = _Item, 
+	     #conn_data{long_request_resend = Val}) ->
+    Val;
+do_conn_info(call_proxy_gc_timeout = _Item, 
+	     #conn_data{call_proxy_gc_timeout = Val}) ->
+    Val;
+do_conn_info(resend_indication = _Item, #conn_data{resend_indication = Val}) ->
+    Val;
+do_conn_info(segment_reply_ind = _Item, #conn_data{segment_reply_ind = Val}) ->
+    Val;
+do_conn_info(segment_recv_acc = _Item, #conn_data{segment_recv_acc = Val}) ->
+    Val;
+do_conn_info(segment_recv_timer = _Item, 
+	     #conn_data{segment_recv_timer = Val}) ->
+    Val;
+do_conn_info(segment_send = _Item, #conn_data{segment_send = Val}) ->
+    Val;
+do_conn_info(segment_send_timer = _Item, 
+	     #conn_data{segment_send_timer = Val}) ->
+    Val;
+do_conn_info(max_pdu_size = _Item, #conn_data{max_pdu_size = Val}) ->
+    Val;
+do_conn_info(request_keep_alive_timeout = _Item, 
+	     #conn_data{request_keep_alive_timeout = Val}) ->
+    Val;
+do_conn_info(receive_handle = _Item, 
+	     #conn_data{conn_handle = #megaco_conn_handle{local_mid = LMid},
+			encoding_mod    = EM,
+			encoding_config = EC,
+			send_mod        = SM}) ->
+    #megaco_receive_handle{local_mid       = LMid,
+			   encoding_mod    = EM,
+			   encoding_config = EC,
+			   send_mod        = SM};
+do_conn_info(Item, Data) 
+  when is_record(Data, conn_data) orelse is_record(Data, megaco_conn_handle) ->
+    exit({no_such_item, Item});
+do_conn_info(_Item, BadData) ->
+    {error, {no_such_connection, BadData}}.
+
+
+%% replace(_, _, []) ->
+%%     [];
+%% replace(Item, WithItem, [Item|List]) ->
+%%     [WithItem|List];
+%% replace(Item, WithItem, [OtherItem|List]) ->
+%%     [OtherItem | replace(Item, WithItem, List)].
 
 
 update_conn_info(#conn_data{conn_handle = CH}, Item, Val) ->