Deprecate erlang:get_stacktrace/1

erts/preloaded/src/erlang.erl

@@ -50,7 +50,7 @@
          dist_ctrl_get_data_notification/1,
          dist_get_stat/1]).
 
--deprecated([now/0]).
+-deprecated([get_stacktrace/0,now/0]).
 
 %% Get rid of autoimports of spawn to avoid clashes with ourselves.
 -compile({no_auto_import,[spawn_link/1]}).

lib/asn1/src/asn1ct.erl

@@ -292,8 +292,7 @@ run_passes_1([{pass,Name,Pass}|Passes], #st{run=Run}=St0)
 	done ->
 	    ok
     catch
-	Class:Error ->
-	    Stk = erlang:get_stacktrace(),
+	Class:Error:Stk ->
 	    io:format("Internal error: ~p:~p\n~p\n",
 		      [Class,Error,Stk]),
 	    {error,{internal_error,{Class,Error}}}
@@ -2390,13 +2389,13 @@ in_process(Fun) ->
     receive
         {Pid, Result}               -> Result;
         {Pid, Class, Reason, Stack} ->
-            ST = try throw(x) catch throw:x -> erlang:get_stacktrace() end,
+            ST = try throw(x) catch throw:x:Stk -> Stk end,
             erlang:raise(Class, Reason, Stack ++ ST)
     end.
 
 process(Parent, Fun) ->
     try
         Parent ! {self(), Fun()}
-    catch Class:Reason ->
-        Parent ! {self(), Class, Reason, erlang:get_stacktrace()}
+    catch Class:Reason:Stack ->
+        Parent ! {self(), Class, Reason, Stack}
     end.

lib/asn1/src/asn1ct_gen.erl

@@ -815,8 +815,7 @@ result_line_1(Items) ->
 
 try_catch() ->
     ["  catch",nl,
-     "    Class:Exception when Class =:= error; Class =:= exit ->",nl,
-     "      Stk = erlang:get_stacktrace(),",nl,
+     "    Class:Exception:Stk when Class =:= error; Class =:= exit ->",nl,
      "      case Exception of",nl,
      "        {error,{asn1,Reason}} ->",nl,
      "          {error,{asn1,{Reason,Stk}}};",nl,

lib/asn1/test/asn1_SUITE.erl

@@ -227,10 +227,9 @@ test(Config, TestF, Rules) ->
                   try
                       TestF(C, R, O)
                   catch
-                      Class:Reason ->
+                      Class:Reason:Stk ->
                           NewReason = {Reason, [{rule, R}, {options, O}]},
-                          erlang:raise(Class, NewReason,
-                                       erlang:get_stacktrace())
+                          erlang:raise(Class, NewReason, Stk)
                   end
           end,
     Result = [run_case(Config, Fun, rule(Rule), opts(Rule)) || Rule <- Rules],

lib/asn1/test/testUniqueObjectSets.erl

@@ -30,8 +30,7 @@ seq_roundtrip(I, D0) ->
         asn1_test_lib:map_roundtrip(M, 'Seq', Enc),
 	{ok,{'Seq',I,D}} = M:decode('Seq', Enc),
 	D
-    catch C:E ->
-	    Stk = erlang:get_stacktrace(),
+    catch C:E:Stk ->
 	    io:format("FAILED: ~p ~p\n", [I,D0]),
 	    erlang:raise(C, E, Stk)
     end.

lib/compiler/doc/src/compile.xml

@@ -649,14 +649,6 @@ module.beam: module.erl \
             <p>Turns off warnings for unused record types. Default is to 
 	    emit warnings for unused locally defined record types.</p>
           </item>
-
-	  <tag><c>nowarn_get_stacktrace</c></tag>
-          <item>
-            <p>Turns off warnings for using <c>get_stacktrace/0</c> in a context
-	    where it will probably not work in a future release. For example,
-	    by default there will be a warning if <c>get_stacktrace/0</c> is
-	    used following a <c>catch</c> expression.</p>
-          </item>
         </taglist>
 
 	<p>Another class of warnings is generated by the compiler

lib/hipe/main/hipe.erl

@@ -669,8 +669,8 @@ run_compiler_1(Name, DisasmFun, IcodeFun, Options) ->
 	    {Icode, WholeModule} = IcodeFun(Code, Opts),
 	    CompRes = compile_finish(Icode, WholeModule, Opts),
 	    compiler_return(CompRes, Parent)
-	  catch error:Error ->
-	      print_crash_message(Name, Error),
+	  catch error:Error:StackTrace ->
+	      print_crash_message(Name, Error, StackTrace),
 	      exit(Error)
 	  end
       end),
@@ -757,8 +757,8 @@ finalize(OrigList, Mod, Exports, WholeModule, Opts) ->
 	  TargetArch = get(hipe_target_arch),
 	  {ok, {TargetArch,Bin}}
       catch
-	error:Error ->
-	  {error,Error,erlang:get_stacktrace()}
+	error:Error:StackTrace ->
+	  {error,Error,StackTrace}
       end
   end.
 
@@ -843,16 +843,16 @@ finalize_fun_sequential({MFA, Icode}, Opts, Servers) ->
     {llvm_binary, Binary} ->
       {MFA, Binary}
   catch
-    error:Error ->
+    error:Error:StackTrace ->
       ?when_option(verbose, Opts, ?debug_untagged_msg("\n", [])),
-      print_crash_message(MFA, Error),
+      print_crash_message(MFA, Error, StackTrace),
       exit(Error)
   end.
 
-print_crash_message(What, Error) ->
+print_crash_message(What, Error, StackTrace) ->
   StackFun = fun(_,_,_) -> false end,
   FormatFun = fun (Term, _) -> io_lib:format("~p", [Term]) end,
-  StackTrace = lib:format_stacktrace(1, erlang:get_stacktrace(),
+  StackTrace = lib:format_stacktrace(1, StackTrace,
 				     StackFun, FormatFun),
   WhatS = case What of
 	    {M,F,A} -> io_lib:format("~w:~w/~w", [M,F,A]);

lib/stdlib/src/erl_lint.erl

@@ -93,13 +93,6 @@ value_option(Flag, Default, On, OnVal, Off, OffVal, Opts) ->
          }).
 
 
-%% Are we outside or inside a catch or try/catch?
--type catch_scope() :: 'none'
-                     | 'after_old_catch'
-                     | 'after_try'
-                     | 'wrong_part_of_try'
-                     | 'try_catch'.
-
 %% Define the lint state record.
 %% 'called' and 'exports' contain {Line, {Function, Arity}},
 %% the other function collections contain {Function, Arity}.
@@ -144,9 +137,7 @@ value_option(Flag, Default, On, OnVal, Off, OffVal, Opts) ->
                    :: dict:dict(ta(), #typeinfo{}),
                exp_types=gb_sets:empty()        %Exported types
                    :: gb_sets:set(ta()),
-               in_try_head=false :: boolean(),  %In a try head.
-               catch_scope = none               %Inside/outside try or catch
-                   :: catch_scope()
+               in_try_head=false :: boolean()  %In a try head.
               }).
 
 -type lint_state() :: #lint{}.
@@ -233,15 +224,6 @@ format_error({redefine_old_bif_import,{F,A}}) ->
 format_error({redefine_bif_import,{F,A}}) ->
     io_lib:format("import directive overrides auto-imported BIF ~w/~w~n"
 		  " - use \"-compile({no_auto_import,[~w/~w]}).\" to resolve name clash", [F,A,F,A]);
-format_error({get_stacktrace,wrong_part_of_try}) ->
-    "erlang:get_stacktrace/0 used in the wrong part of 'try' expression. "
-        "(Use it in the block between 'catch' and 'end'.)";
-format_error({get_stacktrace,after_old_catch}) ->
-    "erlang:get_stacktrace/0 used following an old-style 'catch' "
-        "may stop working in a future release. (Use it inside 'try'.)";
-format_error({get_stacktrace,after_try}) ->
-    "erlang:get_stacktrace/0 used following a 'try' expression "
-        "may stop working in a future release. (Use it inside 'try'.)";
 format_error({deprecated, MFA, ReplacementMFA, Rel}) ->
     io_lib:format("~s is deprecated and will be removed in ~s; use ~s",
 		  [format_mfa(MFA), Rel, format_mfa(ReplacementMFA)]);
@@ -591,10 +573,7 @@ start(File, Opts) ->
 		      false, Opts)},
 	 {missing_spec_all,
 	  bool_option(warn_missing_spec_all, nowarn_missing_spec_all,
-		      false, Opts)},
-         {get_stacktrace,
-          bool_option(warn_get_stacktrace, nowarn_get_stacktrace,
-                      true, Opts)}
+		      false, Opts)}
 	],
     Enabled1 = [Category || {Category,true} <- Enabled0],
     Enabled = ordsets:from_list(Enabled1),
@@ -1426,7 +1405,7 @@ call_function(Line, F, A, #lint{usage=Usage0,called=Cd,func=Func,file=File}=St)
 %% function(Line, Name, Arity, Clauses, State) -> State.
 
 function(Line, Name, Arity, Cs, St0) ->
-    St1 = St0#lint{func={Name,Arity},catch_scope=none},
+    St1 = St0#lint{func={Name,Arity}},
     St2 = define_function(Line, Name, Arity, St1),
     clauses(Cs, St2).
 
@@ -2367,7 +2346,7 @@ expr({call,Line,F,As}, Vt, St0) ->
 expr({'try',Line,Es,Scs,Ccs,As}, Vt, St0) ->
     %% Currently, we don't allow any exports because later
     %% passes cannot handle exports in combination with 'after'.
-    {Evt0,St1} = exprs(Es, Vt, St0#lint{catch_scope=wrong_part_of_try}),
+    {Evt0,St1} = exprs(Es, Vt, St0),
     TryLine = {'try',Line},
     Uvt = vtunsafe(TryLine, Evt0, Vt),
     Evt1 = vtupdate(Uvt, Evt0),
@@ -2379,12 +2358,11 @@ expr({'try',Line,Es,Scs,Ccs,As}, Vt, St0) ->
     {Avt0,St} = exprs(As, vtupdate(Evt2, Vt), St2),
     Avt1 = vtupdate(vtunsafe(TryLine, Avt0, Vt), Avt0),
     Avt = vtmerge(Evt2, Avt1),
-    {Avt,St#lint{catch_scope=after_try}};
+    {Avt,St};
 expr({'catch',Line,E}, Vt, St0) ->
     %% No new variables added, flag new variables as unsafe.
     {Evt,St} = expr(E, Vt, St0),
-    {vtupdate(vtunsafe({'catch',Line}, Evt, Vt), Evt),
-     St#lint{catch_scope=after_old_catch}};
+    {vtupdate(vtunsafe({'catch',Line}, Evt, Vt), Evt),St};
 expr({match,_Line,P,E}, Vt, St0) ->
     {Evt,St1} = expr(E, Vt, St0),
     {Pvt,Bvt,St2} = pattern(P, vtupdate(Evt, Vt), St1),
@@ -3223,7 +3201,7 @@ is_module_dialyzer_option(Option) ->
 
 try_clauses(Scs, Ccs, In, Vt, St0) ->
     {Csvt0,St1} = icrt_clauses(Scs, Vt, St0),
-    St2 = St1#lint{catch_scope=try_catch,in_try_head=true},
+    St2 = St1#lint{in_try_head=true},
     {Csvt1,St3} = icrt_clauses(Ccs, Vt, St2),
     Csvt = Csvt0 ++ Csvt1,
     UpdVt = icrt_export(Csvt, Vt, In, St3),
@@ -3243,15 +3221,15 @@ icrt_clauses(Cs, In, Vt, St0) ->
 icrt_clauses(Cs, Vt, St) ->
     mapfoldl(fun (C, St0) -> icrt_clause(C, Vt, St0) end, St, Cs).
 
-icrt_clause({clause,_Line,H,G,B}, Vt0, #lint{catch_scope=Scope}=St0) ->
+icrt_clause({clause,_Line,H,G,B}, Vt0, St0) ->
     Vt1 = taint_stack_var(Vt0, H, St0),
     {Hvt,Binvt,St1} = head(H, Vt1, St0),
     Vt2 = vtupdate(Hvt, Binvt),
     Vt3 = taint_stack_var(Vt2, H, St0),
     {Gvt,St2} = guard(G, vtupdate(Vt3, Vt0), St1#lint{in_try_head=false}),
     Vt4 = vtupdate(Gvt, Vt2),
     {Bvt,St3} = exprs(B, vtupdate(Vt4, Vt0), St2),
-    {vtupdate(Bvt, Vt4),St3#lint{catch_scope=Scope}}.
+    {vtupdate(Bvt, Vt4),St3}.
 
 taint_stack_var(Vt, Pat, #lint{in_try_head=true}) ->
     [{tuple,_,[_,_,{var,_,Stk}]}] = Pat,
@@ -3736,8 +3714,7 @@ has_wildcard_field([]) -> false.
 check_remote_function(Line, M, F, As, St0) ->
     St1 = deprecated_function(Line, M, F, As, St0),
     St2 = check_qlc_hrl(Line, M, F, As, St1),
-    St3 = check_get_stacktrace(Line, M, F, As, St2),
-    format_function(Line, M, F, As, St3).
+    format_function(Line, M, F, As, St2).
 
 %% check_qlc_hrl(Line, ModName, FuncName, [Arg], State) -> State
 %%  Add warning if qlc:q/1,2 has been called but qlc.hrl has not
@@ -3786,23 +3763,6 @@ deprecated_function(Line, M, F, As, St) ->
 	    St
     end.
 
-check_get_stacktrace(Line, erlang, get_stacktrace, [], St) ->
-    case St of
-        #lint{catch_scope=none} ->
-            St;
-        #lint{catch_scope=try_catch} ->
-            St;
-        #lint{catch_scope=Scope} ->
-            case is_warn_enabled(get_stacktrace, St) of
-                false ->
-                    St;
-                true ->
-                    add_warning(Line, {get_stacktrace,Scope}, St)
-            end
-    end;
-check_get_stacktrace(_, _, _, _, St) ->
-    St.
-
 -dialyzer({no_match, deprecated_type/5}).
 
 deprecated_type(L, M, N, As, St) ->

lib/stdlib/src/otp_internal.erl

@@ -604,6 +604,9 @@ obsolete_1(filename, find_src, 1) ->
 obsolete_1(filename, find_src, 2) ->
     {deprecated, "deprecated; use filelib:find_source/3 instead"};
 
+obsolete_1(erlang, get_stacktrace, 0) ->
+    {deprecated, "deprecated; use the new try/catch syntax for retrieving the stack backtrace"};
+
 %% Removed in OTP 20.
 
 obsolete_1(erlang, hash, 2) ->

lib/stdlib/test/erl_lint_SUITE.erl

@@ -66,7 +66,7 @@
          otp_11851/1,otp_11879/1,otp_13230/1,
          record_errors/1, otp_11879_cont/1,
          non_latin1_module/1, otp_14323/1,
-         get_stacktrace/1, stacktrace_syntax/1,
+         stacktrace_syntax/1,
          otp_14285/1, otp_14378/1]).
 
 suite() ->
@@ -88,7 +88,7 @@ all() ->
      maps, maps_type, maps_parallel_match,
      otp_11851, otp_11879, otp_13230,
      record_errors, otp_11879_cont, non_latin1_module, otp_14323,
-     get_stacktrace, stacktrace_syntax, otp_14285, otp_14378].
+     stacktrace_syntax, otp_14285, otp_14378].
 
 groups() -> 
     [{unused_vars_warn, [],
@@ -4055,82 +4055,6 @@ otp_14323(Config) ->
     [] = run(Config, Ts),
     ok.
 
-get_stacktrace(Config) ->
-    Ts = [{old_catch,
-           <<"t1() ->
-                  catch error(foo),
-                  erlang:get_stacktrace().
-           ">>,
-           [],
-           {warnings,[{3,erl_lint,{get_stacktrace,after_old_catch}}]}},
-          {nowarn_get_stacktrace,
-           <<"t1() ->
-                  catch error(foo),
-                  erlang:get_stacktrace().
-           ">>,
-           [nowarn_get_stacktrace],
-           []},
-          {try_catch,
-           <<"t1(X) ->
-                  try abs(X) of
-                    _ ->
-                      erlang:get_stacktrace()
-                  catch
-                      _:_ -> ok
-                  end.
-
-              t2() ->
-                  try error(foo)
-                  catch _:_ -> ok
-                  end,
-                  erlang:get_stacktrace().
-
-              t3() ->
-                  try error(foo)
-                  catch _:_ ->
-                    try error(bar)
-                    catch _:_ ->
-                      ok
-                    end,
-                    erlang:get_stacktrace()
-                  end.
-
-              no_warning(X) ->
-                  try
-                     abs(X)
-                  catch
-                     _:_ ->
-                       erlang:get_stacktrace()
-                  end.
-           ">>,
-           [],
-           {warnings,[{4,erl_lint,{get_stacktrace,wrong_part_of_try}},
-                      {13,erl_lint,{get_stacktrace,after_try}},
-                      {22,erl_lint,{get_stacktrace,after_try}}]}},
-          {multiple_catch_clauses,
-           <<"maybe_error(Arg) ->
-                try 5 / Arg
-                catch
-                    error:badarith ->
-                        _Stacktrace = erlang:get_stacktrace(),
-                        try io:nl()
-                        catch
-                            error:_ -> io:format('internal error')
-                        end;
-                    error:badarg ->
-                        _Stacktrace = erlang:get_stacktrace(),
-                        try io:format(qwe)
-                        catch
-                            error:_ -> io:format('internal error')
-                        end
-                end.
-             ">>,
-           [],
-           []}],
-
-    run(Config, Ts),
-    ok.
-
 stacktrace_syntax(Config) ->
     Ts = [{guard,
            <<"t1() ->