The R13B03 release.OTP_R13B03

1 files changed, 42 insertions, 0 deletions

diff --git a/lib/tools/examples/xref_examples.erl b/lib/tools/examples/xref_examples.erl
new file mode 100644
index 0000000000..4c082195a2
--- /dev/null
+++ b/lib/tools/examples/xref_examples.erl
@@ -0,0 +1,42 @@
+-module(xref_examples).
+
+-export([script/0]).
+
+%% Used at Erlang/OTP for finding undefined functions and unused local
+%% functions. Output are the two files ${HOME}/undefined.txt and
+%% ${HOME}/unused_locals.txt.
+script() ->
+    Root = code:root_dir(),
+    Dir = os:getenv("HOME"),
+    Server = s,
+    xref:start(Server),
+    {ok, _Relname} = xref:add_release(Server, code:lib_dir(), {name,otp}),
+    %% Exclude undefined functions in some modules...
+    Exclude = "(CORBA|Cos|Orber|Puller|Pusher|"
+	      "StackModule|oe_Cos|mnesia).*_impl",
+    UndefS = "XC || (XU - X - B)",
+    Q = io_lib:format("Undef = ~s,"
+		      "Excluded = ~p:_/_,"
+		      "Undef - Undef || Excluded", 
+		      [UndefS, Exclude]),
+    {ok, Undef} = xref:q(Server, lists:flatten(Q)),
+    {ok, NotCalled} = xref:analyze(Server, locals_not_used),
+    dump("%% " ++ Root ++ 
+	 "\n%% Undefined external functions." ++ 
+	 "\n%% The second MFA is the undefined function." ++
+	 "\n%% Functions in modules matching the following "
+	      "regular expression have been skipped:" ++ 
+	 "\n%% " ++ Exclude,
+	 filename:join(Dir, "undefined.txt"), 
+	 Undef),
+    dump("%% " ++ Root ++ "\n%% Unused local functions.",
+	 filename:join(Dir, "unused_locals.txt"), 
+	 NotCalled),
+    catch xref:stop(Server),
+    halt().
+
+dump(H, F, T) ->
+    {ok, IoDev} = file:open(F,[write]),
+    io:format(IoDev, "~s~n", [H]),
+    io:format(IoDev, "~p.~n", [T]),
+    file:close(IoDev).