--- a/gcc/go/gofrontend/go-linemap.h	Thu Oct 25 07:37:49 2018 +0900
+++ b/gcc/go/gofrontend/go-linemap.h	Thu Feb 13 11:34:05 2020 +0900
@@ -63,7 +63,11 @@
   virtual std::string
   to_string(Location) = 0;
 
-  // Return the line number for a given location (for debugging dumps)
+  // Return the file name for a given location.
+  virtual std::string
+  location_file(Location) = 0;
+
+  // Return the line number for a given location.
   virtual int
   location_line(Location) = 0;
 
@@ -140,7 +144,15 @@
     return Linemap::instance_->to_string(loc);
   }
 
-  // Return line number for location
+  // Return the file name of a location.
+  static std::string
+  location_to_file(Location loc)
+  {
+    go_assert(Linemap::instance_ != NULL);
+    return Linemap::instance_->location_file(loc);
+  }
+
+  // Return line number of a location.
   static int
   location_to_line(Location loc)
   {