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author | Stavros Aronis <aronisstav@gmail.com> | 2011-11-11 16:35:28 +0100 |
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committer | Stavros Aronis <aronisstav@gmail.com> | 2011-11-18 15:06:46 +0100 |
commit | 8682e6b3db55f7f021e529b2134f223b4cc70ace (patch) | |
tree | d2d45e62bd65229a2bd6f9dffa067357c16255a8 /lib/dialyzer | |
parent | fc075ff9064eccd3ea2da0c067ec9ef01aaeb183 (diff) | |
download | otp-8682e6b3db55f7f021e529b2134f223b4cc70ace.tar.gz otp-8682e6b3db55f7f021e529b2134f223b4cc70ace.tar.bz2 otp-8682e6b3db55f7f021e529b2134f223b4cc70ace.zip |
Detection of callback-spec discrepancies
Diffstat (limited to 'lib/dialyzer')
5 files changed, 179 insertions, 22 deletions
diff --git a/lib/dialyzer/src/dialyzer.erl b/lib/dialyzer/src/dialyzer.erl index acbe574e2b..487a12b252 100644 --- a/lib/dialyzer/src/dialyzer.erl +++ b/lib/dialyzer/src/dialyzer.erl @@ -442,14 +442,18 @@ message_to_string({opaque_type_test, [Fun, Opaque]}) -> message_to_string({race_condition, [M, F, Args, Reason]}) -> io_lib:format("The call ~w:~w~s ~s\n", [M, F, Args, Reason]); %%----- Warnings for behaviour errors -------------------- -message_to_string({callback_type_mismatch, [B, F, A, O]}) -> +message_to_string({callback_type_mismatch, [B, F, A, T]}) -> io_lib:format("The inferred return type for ~w/~w is ~s which is not valid" " return for the callback of the ~w behaviour\n", - [F, A, erl_types:t_to_string(O), B]); -message_to_string({callback_arg_type_mismatch, [B, F, A, N, O]}) -> + [F, A, T, B]); +message_to_string({callback_arg_type_mismatch, [B, F, A, N, T]}) -> io_lib:format("The inferred type for the ~s argument of ~w/~w is ~s which is" " not valid for the callback of the ~w behaviour" - "\n", [ordinal(N), F, A, erl_types:t_to_string(O), B]); + "\n", [ordinal(N), F, A, T, B]); +message_to_string({callback_spec_type_mismatch, [B, F, A, ST, CT]}) -> + io_lib:format("The return type ~s in the specification of ~w/~w is not a" + " subtype of ~s, which is the expected return type for the" + " callback of ~w behaviour.\n", [ST, F, A, CT, B]); message_to_string({callback_missing, [B, F, A]}) -> io_lib:format("Undefined callback function ~w/~w (behaviour '~w')\n", [F, A, B]); diff --git a/lib/dialyzer/src/dialyzer_behaviours.erl b/lib/dialyzer/src/dialyzer_behaviours.erl index 82963783d8..a30707c7c3 100644 --- a/lib/dialyzer/src/dialyzer_behaviours.erl +++ b/lib/dialyzer/src/dialyzer_behaviours.erl @@ -88,20 +88,26 @@ get_warnings(Module, [Behaviour|Rest], State, Acc) -> NewAcc = check_behaviour(Module, Behaviour, State, Acc), get_warnings(Module, Rest, State, NewAcc). -check_behaviour(Module, Behaviour, #state{plt = Plt}, Acc) -> +check_behaviour(Module, Behaviour, #state{plt = Plt} = State, Acc) -> case dialyzer_plt:lookup_callbacks(Plt, Behaviour) of [] -> [{callback_info_missing, [Behaviour]}|Acc]; - Callbacks -> check_all_callbacks(Module, Behaviour, Callbacks, Plt, Acc) + Callbacks -> check_all_callbacks(Module, Behaviour, Callbacks, State, Acc) end. -check_all_callbacks(_Module, _Behaviour, [], _Plt, Acc) -> +check_all_callbacks(_Module, _Behaviour, [], _State, Acc) -> Acc; -check_all_callbacks(Module, Behaviour, [Cb|Rest], Plt, Acc) -> +check_all_callbacks(Module, Behaviour, [Cb|Rest], + #state{plt = Plt, codeserver = Codeserver} = State, Acc) -> {{Behaviour, Function, Arity}, {{_BehFile, _BehLine}, Callback}} = Cb, CbMFA = {Module, Function, Arity}, CbReturnType = dialyzer_contracts:get_contract_return(Callback), CbArgTypes = dialyzer_contracts:get_contract_args(Callback), + Records = + case dict:find(Module, dialyzer_codeserver:get_records(Codeserver)) of + {ok, V} -> V; + error -> dict:new() + end, Acc0 = Acc, Acc1 = case dialyzer_plt:lookup(Plt, CbMFA) of @@ -117,8 +123,9 @@ check_all_callbacks(Module, Behaviour, [Cb|Rest], Plt, Acc) -> erl_types:t_inf(ReturnType, CbReturnType)) of false -> Acc00; true -> - [{callback_type_mismatch,[Behaviour, Function, - Arity, ReturnType]}|Acc00] + [{callback_type_mismatch, + [Behaviour, Function, Arity, + erl_types:t_to_string(ReturnType, Records)]}|Acc00] end end, Acc02 = @@ -127,32 +134,44 @@ check_all_callbacks(Module, Behaviour, [Cb|Rest], Plt, Acc) -> false -> Acc01; true -> find_mismatching_args(ArgTypes, CbArgTypes, Behaviour, - Function, Arity, 1, Acc01) + Function, Arity, Records, 1, Acc01) end, Acc02 end, Acc2 = - case dialyzer_plt:lookup_contract(Plt, CbMFA) of - 'none' -> Acc1; - {value, _Contract} -> - %% TODO: Check spec for discrepancies - Acc1 + case dialyzer_codeserver:lookup_mfa_contract(CbMFA, Codeserver) of + 'error' -> Acc1; + {ok, {{File, Line}, Contract}} -> + Acc10 = Acc1, + SpecReturnType = dialyzer_contracts:get_contract_return(Contract), + SpecArgTypes = dialyzer_contracts:get_contract_args(Contract), + Acc11 = + case erl_types:t_is_subtype(SpecReturnType, CbReturnType) of + true -> Acc10; + false -> [{callback_spec_type_mismatch, + [File, Line, Behaviour, Function, Arity, + erl_types:t_to_string(SpecReturnType, Records), + erl_types:t_to_string(CbReturnType, Records)]}|Acc10] + end, + Acc11 end, NewAcc = Acc2, - check_all_callbacks(Module, Behaviour, Rest, Plt, NewAcc). + check_all_callbacks(Module, Behaviour, Rest, State, NewAcc). -find_mismatching_args([], [], _Behaviour, _Function, _Arity, _N, Acc) -> +find_mismatching_args([], [], _Beh, _Function, _Arity, _Records, _N, Acc) -> Acc; find_mismatching_args([Type|Rest], [CbType|CbRest], Behaviour, - Function, Arity, N, Acc) -> + Function, Arity, Records, N, Acc) -> case erl_types:t_is_none(erl_types:t_inf(Type, CbType)) of false -> - find_mismatching_args(Rest, CbRest, Behaviour, Function, Arity, N+1, Acc); + find_mismatching_args(Rest, CbRest, Behaviour, Function, + Arity, Records, N+1, Acc); true -> NewAcc = [{callback_arg_type_mismatch, - [Behaviour, Function, Arity, N, Type]}|Acc], - find_mismatching_args(Rest, CbRest, Behaviour, Function, Arity, N+1, NewAcc) + [Behaviour, Function, Arity, N, erl_types:t_to_string(Type, Records)]}|Acc], + find_mismatching_args(Rest, CbRest, Behaviour, Function, + Arity, Records, N+1, NewAcc) end. add_tag_file_line(_Module, {Tag, [B|_R]} = Warn, State) @@ -160,6 +179,9 @@ add_tag_file_line(_Module, {Tag, [B|_R]} = Warn, State) Tag =:= callback_info_missing -> {B, Line} = lists:keyfind(B, 1, State#state.behlines), {?WARN_BEHAVIOUR, {State#state.filename, Line}, Warn}; +add_tag_file_line(Module, {Tag, [File, Line|R]}, State) + when Tag =:= callback_spec_type_mismatch -> + {?WARN_BEHAVIOUR, {File, Line}, {Tag, R}}; add_tag_file_line(Module, {_Tag, [_B, Fun, Arity|_R]} = Warn, State) -> {_A, FunCode} = dialyzer_codeserver:lookup_mfa_code({Module, Fun, Arity}, diff --git a/lib/dialyzer/test/behaviour_SUITE_data/src/callbacks_and_specs/my_behaviour.erl b/lib/dialyzer/test/behaviour_SUITE_data/src/callbacks_and_specs/my_behaviour.erl new file mode 100644 index 0000000000..c4e5203448 --- /dev/null +++ b/lib/dialyzer/test/behaviour_SUITE_data/src/callbacks_and_specs/my_behaviour.erl @@ -0,0 +1,11 @@ +-module(my_behaviour). + +-callback callback_init(Parent :: pid()) -> {'ok', State::term()}. + +-callback callback_cast(State::term(), From::pid(), Msg::term()) -> + {'noreply', NewState::term()}. + +-callback callback_call(State::term(), From::pid(), Msg::term()) -> + {'reply', NewState::term(), Reply::term()}. + +-callback callback_exit(State::term()) -> 'ok'. diff --git a/lib/dialyzer/test/behaviour_SUITE_data/src/callbacks_and_specs/my_callbacks_correct.erl b/lib/dialyzer/test/behaviour_SUITE_data/src/callbacks_and_specs/my_callbacks_correct.erl new file mode 100644 index 0000000000..041b4ac56c --- /dev/null +++ b/lib/dialyzer/test/behaviour_SUITE_data/src/callbacks_and_specs/my_callbacks_correct.erl @@ -0,0 +1,59 @@ +-module(my_callbacks_correct). + +-export([ + callback_init/1 + , callback_call/3 + , callback_cast/3 + , callback_exit/1 + ]). + +-record(state, { + parent :: pid(), + status = init :: 'init' | 'open' | 'closed', + subscribe = [] :: list({pid(), integer()}), + counter = 1 :: integer() + }). + +-type state() :: #state{}. + +-type cast_message() :: 'open' | 'closed'. + +-type call_message() :: 'subscribe' | 'unsubscribe'. +-type call_reply() :: 'accepted' | 'rejected'. + +-spec callback_init(Parent::pid()) -> {'ok', state()}. + +callback_init(Parent) -> + {ok, #state{parent = Parent}}. + +-spec callback_cast(state(), pid(), cast_message()) -> {'noreply', state()}. + +callback_cast(#state{parent = Pid} = State, Pid, Message) + when Message =:= 'open'; Message =:= 'close' -> + {noreply, State#state{status = Message}}; +callback_cast(State, _Pid, _Message) -> + {noreply, State}. + +-spec callback_call(state(), pid(), call_message()) -> + {'reply', state(), call_reply()}. + +callback_call(#state{status = open, subscribe = Subscribers} = State, + Pid, Message) + when Message =:= 'subscribe'; + Message =:= 'unsubscribe' -> + NewState = + case Message of + subscribe -> + N = State#state.counter, + State#state{subscribe = [{Pid, N}|Subscribers], counter = N+1}; + unsubscribe -> + State#state{subscribe = lists:keydelete(Pid, 1, Subscribers)} + end, + {reply, NewState, accepted}; +callback_call(State, _Pid, _Message) -> + {reply, State, rejected}. + +-spec callback_exit(state()) -> 'ok'. + +callback_exit(_State) -> + ok. diff --git a/lib/dialyzer/test/behaviour_SUITE_data/src/callbacks_and_specs/my_callbacks_wrong.erl b/lib/dialyzer/test/behaviour_SUITE_data/src/callbacks_and_specs/my_callbacks_wrong.erl new file mode 100644 index 0000000000..0459622dc1 --- /dev/null +++ b/lib/dialyzer/test/behaviour_SUITE_data/src/callbacks_and_specs/my_callbacks_wrong.erl @@ -0,0 +1,61 @@ +-module(my_callbacks_wrong). + +-export([ + callback_init/1 + , callback_call/3 + , callback_cast/3 + , callback_exit/1 + ]). + +-behaviour(my_behaviour). + +-record(state, { + parent :: pid(), + status = init :: 'init' | 'open' | 'closed', + subscribe = [] :: list({pid(), integer()}), + counter = 1 :: integer() + }). + +-type state() :: #state{}. + +-type cast_message() :: 'open' | 'closed'. + +-type call_message() :: 'subscribe' | 'unsubscribe'. +-type call_reply() :: 'accepted' | 'rejected'. + +-spec callback_init(Parent::pid()) -> state(). %% Wrong return spec + +callback_init(Parent) -> #state{parent = Parent}. %% Wrong return + +-spec callback_cast(state(), pid() | atom(), cast_message()) -> + {'noreply' | 'reply', state()}. %% More generic spec + +callback_cast(#state{parent = Pid} = State, Pid, Message) + when Message =:= 'open'; Message =:= 'close' -> + {noreply, State#state{status = Message}}; +callback_cast(State, _Pid, _Message) -> + {noreply, State}. + +-spec callback_call(state(), atom(), call_message()) -> %% Wrong arg spec + {'reply', state(), call_reply()}. + +callback_call(#state{status = open, subscribe = Subscribers} = State, + Pid, Message) + when Message =:= 'subscribe'; + Message =:= 'unsubscribe' -> + NewState = + case Message of + subscribe -> + N = State#state.counter, + State#state{subscribe = [{Pid, N}|Subscribers], counter = N+1}; + unsubscribe -> + State#state{subscribe = lists:keydelete(Pid, 1, Subscribers)} + end, + {reply, NewState, accepted}; +callback_call(State, _Pid, _Message) -> + {reply, State, rejected}. + +-spec callback_exit(state()) -> ok. + +callback_exit(_State) -> + ok. |