trace behaviour_info

Author: lukaszsamson

lib/elixir_sense/core/compiler.ex

@@ -1799,6 +1799,18 @@ defmodule ElixirSense.Core.Compiler do
         end)
       end)
 
+    # elixir forces runtime dependency on behaviour via Module.force_behaviour_dependencies
+    # which emits a trace for a fake behaviour_info call
+    state =
+      Enum.reduce(state.behaviours[full], state, fn behaviour, state ->
+        state
+        |> State.add_call_to_line(
+          {behaviour, :behaviour_info, 1},
+          [line: meta[:line]],
+          :remote_function
+        )
+      end)
+
     # restore vars from outer scope
     # restore version counter
     state =

test/elixir_sense/core/metadata_builder_test.exs

@@ -7661,6 +7661,27 @@ defmodule ElixirSense.Core.MetadataBuilderTest do
              end)
     end
 
+    test "registers behaviour_info call on @behaviour" do
+      state =
+        """
+        defmodule NyModule do
+          @behaviour MyBehaviour
+        end
+        """
+        |> string_to_state
+
+      assert [
+               %CallInfo{func: :defmodule},
+               %CallInfo{
+                 arity: 1,
+                 position: {1, nil},
+                 mod: MyBehaviour,
+                 func: :behaviour_info,
+                 kind: :remote_function
+               }
+             ] = state.calls[1]
+    end
+
     defmodule StructExpansion do
       defstruct [:foo]
     end