From dc4b576b334cfff188b15740a38e7b2b1d5ab004 Mon Sep 17 00:00:00 2001
From: Hans Bolinder <hasse@erlang.org>
Date: Mon, 5 Feb 2018 09:03:36 +0100
Subject: debugger: Do not try to restore stacktrace

---
 lib/debugger/src/dbg_debugged.erl | 33 ++++++++++-----------------------
 1 file changed, 10 insertions(+), 23 deletions(-)

(limited to 'lib/debugger')

diff --git a/lib/debugger/src/dbg_debugged.erl b/lib/debugger/src/dbg_debugged.erl
index e142af4ae0..0e1de33310 100644
--- a/lib/debugger/src/dbg_debugged.erl
+++ b/lib/debugger/src/dbg_debugged.erl
@@ -31,32 +31,25 @@
 %% Called via the error handler.
 %%--------------------------------------------------------------------
 eval(Mod, Func, Args) ->
-    SaveStacktrace = erlang:get_stacktrace(),
     Meta = dbg_ieval:eval(Mod, Func, Args),
     Mref = erlang:monitor(process, Meta),
-    msg_loop(Meta, Mref, SaveStacktrace).
+    msg_loop(Meta, Mref).
 
 %%====================================================================
 %% Internal functions
 %%====================================================================
 
-msg_loop(Meta, Mref, SaveStacktrace) ->
+msg_loop(Meta, Mref) ->
     receive
 
 	%% Evaluated function has returned a value
 	{sys, Meta, {ready, Val}} ->
 	    erlang:demonitor(Mref, [flush]),
-
-	    %% Restore original stacktrace and return the value
-	    try erlang:raise(throw, stack, SaveStacktrace)
-	    catch
-		throw:stack ->
-		    case Val of
-			{dbg_apply,M,F,A} ->
-			    apply(M, F, A);
-			_ ->
-			    Val
-		    end
+            case Val of
+                {dbg_apply,M,F,A} ->
+                    apply(M, F, A);
+                _ ->
+                    Val
 	    end;
 
 	%% Evaluated function raised an (uncaught) exception
@@ -74,24 +67,18 @@ msg_loop(Meta, Mref, SaveStacktrace) ->
 		Meta ! {self(), rec_acked},
 		ok
 	    end,
-	    msg_loop(Meta, Mref, SaveStacktrace);
+	    msg_loop(Meta, Mref);
 
 	%% Meta needs something evaluated within context of real process
 	{sys, Meta, {command,Command}} ->
 	    Reply = handle_command(Command),
 	    Meta ! {sys, self(), Reply},
-	    msg_loop(Meta, Mref, SaveStacktrace);
+	    msg_loop(Meta, Mref);
 
 	%% Meta has terminated
 	%% Must be due to int:stop() (or -heaven forbid- a debugger bug)
 	{'DOWN', Mref, _, _, Reason} ->
-
-	    %% Restore original stacktrace and return a dummy value
-	    try erlang:raise(throw, stack, SaveStacktrace)
-	    catch
-		throw:stack ->
-		    {interpreter_terminated, Reason}
-	    end
+            {interpreter_terminated, Reason}
     end.
 
 handle_command(Command) ->
-- 
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