emulator: Add a fourth element in exception stacktraces

This commit is a preparation for introducing location information
(filename/line number) in stacktraces in exceptions. Currently
a stack trace looks like:

  [{Mod1,Function1,Arity1},
   .
   .
   .
   {ModN,FunctionN,ArityN}]

Add a forth element to each tuple that can be used indication
the filename and line number of the source file:

  [{Mod1,Function1,Arity1,Location1},
   .
   .
   .
   {ModN,FunctionN,ArityN,LocationN}]

In this commit, the fourth element will just be an empty list,
and we will change all code that look at or manipulate stacktraces.

1 files changed, 4 insertions, 4 deletions

diff --git a/lib/stdlib/src/gen_event.erl b/lib/stdlib/src/gen_event.erl
index 1c4a73680b..d1dd074fba 100644
--- a/lib/stdlib/src/gen_event.erl
+++ b/lib/stdlib/src/gen_event.erl
@@ -667,16 +667,16 @@ report_error(_Handler, {swapped,_,_}, _, _, _)      -> ok;
 report_error(Handler, Reason, State, LastIn, SName) ->
     Reason1 = 
 	case Reason of
-	    {'EXIT',{undef,[{M,F,A}|MFAs]}} ->
+	    {'EXIT',{undef,[{M,F,A,L}|MFAs]}} ->
 		case code:is_loaded(M) of
 		    false ->
-			{'module could not be loaded',[{M,F,A}|MFAs]};
+			{'module could not be loaded',[{M,F,A,L}|MFAs]};
 		    _ ->
 			case erlang:function_exported(M, F, length(A)) of
 			    true ->
-				{undef,[{M,F,A}|MFAs]};
+				{undef,[{M,F,A,L}|MFAs]};
 			    false ->
-				{'function not exported',[{M,F,A}|MFAs]}
+				{'function not exported',[{M,F,A,L}|MFAs]}
 			end
 		end;
 	    {'EXIT',Why} ->