diff options
Diffstat (limited to 'lib/stdlib/src/erl_lint.erl')
| -rw-r--r-- | lib/stdlib/src/erl_lint.erl | 73 |
1 files changed, 63 insertions, 10 deletions
diff --git a/lib/stdlib/src/erl_lint.erl b/lib/stdlib/src/erl_lint.erl index 7c40058dd8..d53a31db0d 100644 --- a/lib/stdlib/src/erl_lint.erl +++ b/lib/stdlib/src/erl_lint.erl @@ -92,6 +92,14 @@ value_option(Flag, Default, On, OnVal, Off, OffVal, Opts) -> :: dict:dict(ta(), line()) }). + +%% 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}. @@ -135,7 +143,9 @@ value_option(Flag, Default, On, OnVal, Off, OffVal, Opts) -> types = dict:new() %Type definitions :: dict:dict(ta(), #typeinfo{}), exp_types=gb_sets:empty() %Exported types - :: gb_sets:set(ta()) + :: gb_sets:set(ta()), + catch_scope = none %Inside/outside try or catch + :: catch_scope() }). -type lint_state() :: #lint{}. @@ -223,7 +233,15 @@ 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)]); @@ -568,7 +586,10 @@ start(File, Opts) -> false, Opts)}, {missing_spec_all, bool_option(warn_missing_spec_all, nowarn_missing_spec_all, - false, Opts)} + false, Opts)}, + {get_stacktrace, + bool_option(warn_get_stacktrace, nowarn_get_stacktrace, + true, Opts)} ], Enabled1 = [Category || {Category,true} <- Enabled0], Enabled = ordsets:from_list(Enabled1), @@ -1405,8 +1426,9 @@ 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 = define_function(Line, Name, Arity, St0#lint{func={Name,Arity}}), - clauses(Cs, St1). + St1 = St0#lint{func={Name,Arity},catch_scope=none}, + St2 = define_function(Line, Name, Arity, St1), + clauses(Cs, St2). -spec define_function(line(), atom(), arity(), lint_state()) -> lint_state(). @@ -2338,22 +2360,24 @@ 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), + {Evt0,St1} = exprs(Es, Vt, St0#lint{catch_scope=wrong_part_of_try}), TryLine = {'try',Line}, Uvt = vtunsafe(TryLine, Evt0, Vt), Evt1 = vtupdate(Uvt, Evt0), - {Sccs,St2} = icrt_clauses(Scs++Ccs, TryLine, vtupdate(Evt1, Vt), St1), + {Sccs,St2} = try_clauses(Scs, Ccs, TryLine, + vtupdate(Evt1, Vt), St1), Rvt0 = Sccs, Rvt1 = vtupdate(vtunsafe(TryLine, Rvt0, Vt), Rvt0), Evt2 = vtmerge(Evt1, Rvt1), {Avt0,St} = exprs(As, vtupdate(Evt2, Vt), St2), Avt1 = vtupdate(vtunsafe(TryLine, Avt0, Vt), Avt0), Avt = vtmerge(Evt2, Avt1), - {Avt,St}; + {Avt,St#lint{catch_scope=after_try}}; 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}; + {vtupdate(vtunsafe({'catch',Line}, Evt, Vt), Evt), + St#lint{catch_scope=after_old_catch}}; expr({match,_Line,P,E}, Vt, St0) -> {Evt,St1} = expr(E, Vt, St0), {Pvt,Bvt,St2} = pattern(P, vtupdate(Evt, Vt), St1), @@ -3173,6 +3197,17 @@ is_module_dialyzer_option(Option) -> error_handling,race_conditions,no_missing_calls, specdiffs,overspecs,underspecs,unknown]). +%% try_catch_clauses(Scs, Ccs, In, ImportVarTable, State) -> +%% {UpdVt,State}. + +try_clauses(Scs, Ccs, In, Vt, St0) -> + {Csvt0,St1} = icrt_clauses(Scs, Vt, St0), + St2 = St1#lint{catch_scope=try_catch}, + {Csvt1,St3} = icrt_clauses(Ccs, Vt, St2), + Csvt = Csvt0 ++ Csvt1, + UpdVt = icrt_export(Csvt, Vt, In, St3), + {UpdVt,St3}. + %% icrt_clauses(Clauses, In, ImportVarTable, State) -> %% {UpdVt,State}. @@ -3657,7 +3692,8 @@ 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), - format_function(Line, M, F, As, St2). + St3 = check_get_stacktrace(Line, M, F, As, St2), + format_function(Line, M, F, As, St3). %% check_qlc_hrl(Line, ModName, FuncName, [Arg], State) -> State %% Add warning if qlc:q/1,2 has been called but qlc.hrl has not @@ -3706,6 +3742,23 @@ 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) -> |