Trace functions before they are inlined, closes #12925

Author: josevalim

lib/elixir/src/elixir_dispatch.erl

@@ -130,11 +130,15 @@ dispatch_require(Meta, Receiver, Name, Args, S, E, Callback) when is_atom(Receiv
 
   case elixir_rewrite:inline(Receiver, Name, Arity) of
     {AR, AN} ->
+      elixir_env:trace({remote_function, Meta, Receiver, Name, Arity}, E),
       Callback(AR, AN, Args);
     false ->
       case expand_require(Meta, Receiver, {Name, Arity}, Args, S, E) of
-        {ok, Receiver, Quoted} -> expand_quoted(Meta, Receiver, Name, Arity, Quoted, S, E);
-        error -> Callback(Receiver, Name, Args)
+        {ok, Receiver, Quoted} ->
+          expand_quoted(Meta, Receiver, Name, Arity, Quoted, S, E);
+        error ->
+          elixir_env:trace({remote_function, Meta, Receiver, Name, Arity}, E),
+          Callback(Receiver, Name, Args)
       end
   end;
 

lib/elixir/src/elixir_expand.erl

@@ -856,10 +856,6 @@ expand_remote(Receiver, DotMeta, Right, Meta, Args, S, SL, #{context := Context}
 
     _ ->
       AttachedDotMeta = attach_context_module(Receiver, DotMeta, E),
-
-      is_atom(Receiver) andalso
-        elixir_env:trace({remote_function, Meta, Receiver, Right, length(Args)}, E),
-
       {EArgs, {SA, _}, EA} = mapfold(fun expand_arg/3, {SL, S}, E, Args),
 
       case rewrite(Context, Receiver, AttachedDotMeta, Right, Meta, EArgs, S) of

lib/elixir/test/elixir/kernel/tracers_test.exs

@@ -118,6 +118,7 @@ defmodule Kernel.TracersTest do
     require Integer
     true = Integer.is_odd(1)
     {1, ""} = Integer.parse("1")
+    "foo" = Atom.to_string(:foo)
     """)
 
     assert_receive {{:remote_macro, meta, Integer, :is_odd, 1}, _}
@@ -127,6 +128,10 @@ defmodule Kernel.TracersTest do
     assert_receive {{:remote_function, meta, Integer, :parse, 1}, _}
     assert meta[:line] == 3
     assert meta[:column] == 19
+
+    assert_receive {{:remote_function, meta, Atom, :to_string, 1}, _}
+    assert meta[:line] == 4
+    assert meta[:column] == 14
   end
 
   test "traces remote via captures" do