Merge branch 'hasse/stdlib/linter_check_dialyzer/OTP-14323'

* hasse/stdlib/linter_check_dialyzer/OTP-14323:
  stdlib: Add checks of the dialyzer attribute to the linter

2 files changed, 108 insertions, 7 deletions

diff --git a/lib/stdlib/src/erl_lint.erl b/lib/stdlib/src/erl_lint.erl
index 0789f5dfb7..78b7a0e751 100644
--- a/lib/stdlib/src/erl_lint.erl
+++ b/lib/stdlib/src/erl_lint.erl
@@ -404,6 +404,10 @@ format_error({not_exported_opaque, {TypeName, Arity}}) ->
 format_error({underspecified_opaque, {TypeName, Arity}}) ->
     io_lib:format("opaque type ~w~s is underspecified and therefore meaningless",
                   [TypeName, gen_type_paren(Arity)]);
+format_error({bad_dialyzer_attribute,Term}) ->
+    io_lib:format("badly formed dialyzer attribute: ~w", [Term]);
+format_error({bad_dialyzer_option,Term}) ->
+    io_lib:format("unknown dialyzer warning option: ~w", [Term]);
 %% --- obsolete? unused? ---
 format_error({format_error, {Fmt, Args}}) ->
     io_lib:format(Fmt, Args).
@@ -796,8 +800,7 @@ attribute_state(Form, St) ->
 %%      State'
 %%  Allow for record, type and opaque type definitions and spec
 %%  declarations to be intersperced within function definitions.
-%%  Dialyzer attributes are also allowed everywhere, but are not
-%%  checked at all.
+%%  Dialyzer attributes are also allowed everywhere.
 
 function_state({attribute,L,record,{Name,Fields}}, St) ->
     record_def(L, Name, Fields, St);
@@ -883,7 +886,8 @@ post_traversal_check(Forms, St0) ->
     StD = check_on_load(StC),
     StE = check_unused_records(Forms, StD),
     StF = check_local_opaque_types(StE),
-    check_callback_information(StF).
+    StG = check_dialyzer_attribute(Forms, StF),
+    check_callback_information(StG).
 
 %% check_behaviour(State0) -> State
 %% Check that the behaviour attribute is valid.
@@ -3116,6 +3120,59 @@ check_local_opaque_types(St) ->
         end,
     dict:fold(FoldFun, St, Ts).
 
+check_dialyzer_attribute(Forms, St0) ->
+    Vals = [{L,V} ||
+               {attribute,L,dialyzer,Val} <- Forms,
+               V0 <- lists:flatten([Val]),
+               V <- case V0 of
+                        {O,F} ->
+                            [{A,B} ||
+                                A <- lists:flatten([O]),
+                                B <- lists:flatten([F])];
+                        T -> [T]
+                    end],
+    {Wellformed, Bad} =
+        lists:partition(fun ({_,{Option,FA}}) when is_atom(Option) ->
+                                is_fa(FA);
+                            ({_,Option}) when is_atom(Option) -> true;
+                            (_) -> false
+                        end, Vals),
+    St1 = foldl(fun ({L,Term}, St) ->
+		  add_error(L, {bad_dialyzer_attribute,Term}, St)
+	  end, St0, Bad),
+    DefFunctions = (gb_sets:to_list(St0#lint.defined) -- pseudolocals()),
+    Fun = fun ({L,{Option,FA}}, St) ->
+                  case is_function_dialyzer_option(Option) of
+                      true ->
+                          case lists:member(FA, DefFunctions) of
+                              true -> St;
+                              false ->
+                                  add_error(L, {undefined_function,FA}, St)
+                          end;
+                      false ->
+                          add_error(L, {bad_dialyzer_option,Option}, St)
+                  end;
+              ({L,Option}, St) ->
+                  case is_module_dialyzer_option(Option) of
+                      true -> St;
+                      false ->
+                          add_error(L, {bad_dialyzer_option,Option}, St)
+                  end
+          end,
+    foldl(Fun, St1, Wellformed).
+
+is_function_dialyzer_option(nowarn_function) -> true;
+is_function_dialyzer_option(Option) ->
+    is_module_dialyzer_option(Option).
+
+is_module_dialyzer_option(Option) ->
+    lists:member(Option,
+                 [no_return,no_unused,no_improper_lists,no_fun_app,
+                  no_match,no_opaque,no_fail_call,no_contracts,
+                  no_behaviours,no_undefined_callbacks,unmatched_returns,
+                  error_handling,race_conditions,no_missing_calls,
+                  specdiffs,overspecs,underspecs,unknown]).
+
 %% icrt_clauses(Clauses, In, ImportVarTable, State) ->
 %%      {UpdVt,State}.
 
diff --git a/lib/stdlib/test/erl_lint_SUITE.erl b/lib/stdlib/test/erl_lint_SUITE.erl
index fd7de65302..c469624fb4 100644
--- a/lib/stdlib/test/erl_lint_SUITE.erl
+++ b/lib/stdlib/test/erl_lint_SUITE.erl
@@ -64,8 +64,8 @@
          predef/1,
          maps/1,maps_type/1,maps_parallel_match/1,
          otp_11851/1,otp_11879/1,otp_13230/1,
-         record_errors/1, otp_xxxxx/1,
-         non_latin1_module/1]).
+         record_errors/1, otp_11879_cont/1,
+         non_latin1_module/1, otp_14323/1]).
 
 suite() ->
     [{ct_hooks,[ts_install_cth]},
@@ -85,7 +85,7 @@ all() ->
      too_many_arguments, basic_errors, bin_syntax_errors, predef,
      maps, maps_type, maps_parallel_match,
      otp_11851, otp_11879, otp_13230,
-     record_errors, otp_xxxxx, non_latin1_module].
+     record_errors, otp_11879_cont, non_latin1_module, otp_14323].
 
 groups() -> 
     [{unused_vars_warn, [],
@@ -3875,7 +3875,7 @@ record_errors(Config) when is_list(Config) ->
 		    {3,erl_lint,{redefine_field,r,a}}],[]}}],
     run(Config, Ts).
 
-otp_xxxxx(Config) ->
+otp_11879_cont(Config) ->
     Ts = [{constraint1,
            <<"-export([t/1]).
               -spec t(X) -> X when is_subtype(integer()).
@@ -3942,6 +3942,50 @@ do_non_latin1_module(Mod) ->
     ok.
 
 
+%% OTP-14323: Check the dialyzer attribute.
+otp_14323(Config) ->
+    Ts = [
+          {otp_14323_1,
+           <<"-import(mod, [m/1]).
+
+              -export([f/0, g/0, h/0]).
+
+              -dialyzer({nowarn_function,module_info/0}). % undefined function
+              -dialyzer({nowarn_function,record_info/2}). % undefined function
+              -dialyzer({nowarn_function,m/1}). % undefined function
+
+              -dialyzer(nowarn_function). % unknown option
+              -dialyzer(1). % badly formed
+              -dialyzer(malformed). % unkonwn option
+              -dialyzer({malformed,f/0}). % unkonwn option
+              -dialyzer({nowarn_function,a/1}). % undefined function
+              -dialyzer({nowarn_function,{a,-1}}). % badly formed
+
+              -dialyzer([no_return, no_match]).
+              -dialyzer({nowarn_function, f/0}).
+              -dialyzer(no_improper_lists).
+              -dialyzer([{nowarn_function, [f/0]}, no_improper_lists]).
+              -dialyzer({no_improper_lists, g/0}).
+              -dialyzer({[no_return, no_match], [g/0, h/0]}).
+
+              f() -> a.
+              g() -> b.
+              h() -> c.">>,
+           [],
+           {errors,[{5,erl_lint,{undefined_function,{module_info,0}}},
+                    {6,erl_lint,{undefined_function,{record_info,2}}},
+                    {7,erl_lint,{undefined_function,{m,1}}},
+                    {9,erl_lint,{bad_dialyzer_option,nowarn_function}},
+                    {10,erl_lint,{bad_dialyzer_attribute,1}},
+                    {11,erl_lint,{bad_dialyzer_option,malformed}},
+                    {12,erl_lint,{bad_dialyzer_option,malformed}},
+                    {13,erl_lint,{undefined_function,{a,1}}},
+                    {14,erl_lint,{bad_dialyzer_attribute,
+                                  {nowarn_function,{a,-1}}}}],
+            []}}],
+    [] = run(Config, Ts),
+    ok.
+
 run(Config, Tests) ->
     F = fun({N,P,Ws,E}, BadL) ->
                 case catch run_test(Config, P, Ws) of