implement and test field access

test/compiler/statements/test_fields.rb

@@ -0,0 +1,46 @@
+require_relative 'helper'
+
+
+module Register
+  class TestFieldStatement < MiniTest::Test
+    include Statements
+
+    def test_field_frame
+      @string_input = <<HERE
+class Fielded
+  field int one
+end
+class Object
+  int main()
+    Fielded f
+    return f.one
+  end
+end
+HERE
+      @expect =  [Label, GetSlot, SetSlot, Label, FunctionReturn]
+      check
+    end
+
+    def test_field_arg
+      @string_input = <<HERE
+class Fielded
+  field int one
+end
+class Object
+  int the_one(Fielded f)
+    return f.one
+  end
+  int main()
+    Fielded f
+    return the_one(f)
+  end
+end
+HERE
+      @expect =  [Label, GetSlot, GetSlot, SetSlot, LoadConstant, SetSlot, LoadConstant ,
+                 SetSlot, GetSlot, GetSlot, SetSlot, LoadConstant, SetSlot, RegisterTransfer ,
+                 FunctionCall, Label, RegisterTransfer, GetSlot, GetSlot, SetSlot, Label ,
+                 FunctionReturn]
+      check
+    end
+  end
+end