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author | Niclas Axelsson <burbas@erlang.org> | 2011-03-04 16:39:01 +0100 |
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committer | Niclas Axelsson <burbas@erlang.org> | 2011-03-04 16:39:05 +0100 |
commit | ce1e0d42cc7e060b10eaa63c67fc1cad6e4d37c6 (patch) | |
tree | 626a5e2b3b4dd15f8f93b7842877bd6466aa71ff /lib/dialyzer/src | |
parent | 0f52060f8514ddd3e58004f4231da581a93209c6 (diff) | |
parent | 271ee9372e07feafae6af35ccc783946371d50bd (diff) | |
download | otp-ce1e0d42cc7e060b10eaa63c67fc1cad6e4d37c6.tar.gz otp-ce1e0d42cc7e060b10eaa63c67fc1cad6e4d37c6.tar.bz2 otp-ce1e0d42cc7e060b10eaa63c67fc1cad6e4d37c6.zip |
Merge branch 'sa/dialyzer-fix-guards' into dev
* sa/dialyzer-fix-guards:
Fix warnings about guards containing not
Fix errors in the handling of 'and'/'or' guards
Cosmetic changes
OTP-9099
Diffstat (limited to 'lib/dialyzer/src')
-rw-r--r-- | lib/dialyzer/src/dialyzer.erl | 2 | ||||
-rw-r--r-- | lib/dialyzer/src/dialyzer_dataflow.erl | 120 |
2 files changed, 75 insertions, 47 deletions
diff --git a/lib/dialyzer/src/dialyzer.erl b/lib/dialyzer/src/dialyzer.erl index f4b3cff19c..dde0c17c39 100644 --- a/lib/dialyzer/src/dialyzer.erl +++ b/lib/dialyzer/src/dialyzer.erl @@ -336,6 +336,8 @@ message_to_string({guard_fail, [Arg1, Infix, Arg2]}) -> io_lib:format("Guard test ~s ~s ~s can never succeed\n", [Arg1, Infix, Arg2]); message_to_string({guard_fail, [Guard, Args]}) -> io_lib:format("Guard test ~w~s can never succeed\n", [Guard, Args]); +message_to_string({neg_guard_fail, [Guard, Args]}) -> + io_lib:format("Guard test not(~w~s) can never succeed\n", [Guard, Args]); message_to_string({guard_fail_pat, [Pat, Type]}) -> io_lib:format("Clause guard cannot succeed. The ~s was matched" " against the type ~s\n", [Pat, Type]); diff --git a/lib/dialyzer/src/dialyzer_dataflow.erl b/lib/dialyzer/src/dialyzer_dataflow.erl index b80c7efc1a..2ffbcd3e82 100644 --- a/lib/dialyzer/src/dialyzer_dataflow.erl +++ b/lib/dialyzer/src/dialyzer_dataflow.erl @@ -1457,6 +1457,7 @@ do_clause(C, Arg, ArgType0, OrigArgType, Map, false -> WarnType = case Msg of {guard_fail, _} -> ?WARN_MATCHING; + {neg_guard_fail, _} -> ?WARN_MATCHING; {opaque_guard, _} -> ?WARN_OPAQUE end, state__add_warning(State1, WarnType, FailGuard, Msg); @@ -1748,7 +1749,7 @@ bind_opaque_pats(GenType, Type, Pat, Map, State, Rev) -> bind_guard(Guard, Map, State) -> try bind_guard(Guard, Map, dict:new(), pos, State) of - {Map1, _Type} -> Map1 + {Map1, _Type} -> Map1 catch throw:{fail, Warning} -> {error, Warning}; throw:{fatal_fail, Warning} -> {error, Warning} @@ -1869,8 +1870,8 @@ handle_guard_gen_fun({M, F, A}, Guard, Map, Env, Eval, State) -> true -> %% Is this an error-bif? case t_is_none(erl_bif_types:type(M, F, A)) of - true -> signal_guard_fail(Guard, As, State); - false -> signal_guard_fatal_fail(Guard, As, State) + true -> signal_guard_fail(Eval, Guard, As, State); + false -> signal_guard_fatal_fail(Eval, Guard, As, State) end; false -> BifArgs = case erl_bif_types:arg_types(M, F, A) of @@ -1887,7 +1888,7 @@ handle_guard_gen_fun({M, F, A}, Guard, Map, Env, Eval, State) -> case t_is_none(Ret) of true -> case Eval =:= pos of - true -> signal_guard_fail(Guard, As, State); + true -> signal_guard_fail(Eval, Guard, As, State); false -> throw({fail, none}) end; false -> {Map2, Ret} @@ -1900,7 +1901,7 @@ handle_guard_type_test(Guard, F, Map, Env, Eval, State) -> case bind_type_test(Eval, F, ArgType, State) of error -> ?debug("Type test: ~w failed\n", [F]), - signal_guard_fail(Guard, [ArgType], State); + signal_guard_fail(Eval, Guard, [ArgType], State); {ok, NewArgType, Ret} -> ?debug("Type test: ~w succeeded, NewType: ~s, Ret: ~s\n", [F, t_to_string(NewArgType), t_to_string(Ret)]), @@ -1963,18 +1964,19 @@ handle_guard_comp(Guard, Comp, Map, Env, Eval, State) -> true when Eval =:= pos -> {Map, t_atom(true)}; true when Eval =:= dont_know -> {Map, t_atom(true)}; true when Eval =:= neg -> {Map, t_atom(true)}; - false when Eval =:= pos -> signal_guard_fail(Guard, ArgTypes, State); + false when Eval =:= pos -> + signal_guard_fail(Eval, Guard, ArgTypes, State); false when Eval =:= dont_know -> {Map, t_atom(false)}; false when Eval =:= neg -> {Map, t_atom(false)} end; {literal, var} when IsInt1 andalso IsInt2 andalso (Eval =:= pos) -> case bind_comp_literal_var(Arg1, Arg2, Type2, Comp, Map1) of - error -> signal_guard_fail(Guard, ArgTypes, State); + error -> signal_guard_fail(Eval, Guard, ArgTypes, State); {ok, NewMap} -> {NewMap, t_atom(true)} end; {var, literal} when IsInt1 andalso IsInt2 andalso (Eval =:= pos) -> case bind_comp_literal_var(Arg2, Arg1, Type1, invert_comp(Comp), Map1) of - error -> signal_guard_fail(Guard, ArgTypes, State); + error -> signal_guard_fail(Eval, Guard, ArgTypes, State); {ok, NewMap} -> {NewMap, t_atom(true)} end; {_, _} -> @@ -2014,7 +2016,7 @@ handle_guard_is_function(Guard, Map, Env, Eval, State) -> [FunType0, ArityType0] = ArgTypes0, ArityType = t_inf(ArityType0, t_integer()), case t_is_none(ArityType) of - true -> signal_guard_fail(Guard, ArgTypes0, State); + true -> signal_guard_fail(Eval, Guard, ArgTypes0, State); false -> FunTypeConstr = case t_number_vals(ArityType) of @@ -2026,7 +2028,7 @@ handle_guard_is_function(Guard, Map, Env, Eval, State) -> case t_is_none(FunType) of true -> case Eval of - pos -> signal_guard_fail(Guard, ArgTypes0, State); + pos -> signal_guard_fail(Eval, Guard, ArgTypes0, State); neg -> {Map1, t_atom(false)}; dont_know -> {Map1, t_atom(false)} end; @@ -2062,7 +2064,7 @@ handle_guard_is_record(Guard, Map, Env, Eval, State) -> case t_is_none(Type) of true -> case Eval of - pos -> signal_guard_fail(Guard, + pos -> signal_guard_fail(Eval, Guard, [RecType, t_from_term(Tag), t_from_term(Arity)], State); @@ -2095,7 +2097,7 @@ handle_guard_eq(Guard, Map, Env, Eval, State) -> Eval =:= pos -> ArgTypes = [t_from_term(cerl:concrete(Arg1)), t_from_term(cerl:concrete(Arg2))], - signal_guard_fail(Guard, ArgTypes, State) + signal_guard_fail(Eval, Guard, ArgTypes, State) end end; {literal, _} when Eval =:= pos -> @@ -2150,7 +2152,7 @@ handle_guard_eqeq(Guard, Map, Env, Eval, State) -> Eval =:= pos -> ArgTypes = [t_from_term(cerl:concrete(Arg1)), t_from_term(cerl:concrete(Arg2))], - signal_guard_fail(Guard, ArgTypes, State) + signal_guard_fail(Eval, Guard, ArgTypes, State) end end; {literal, _} when Eval =:= pos -> @@ -2172,7 +2174,7 @@ bind_eqeq_guard(Guard, Arg1, Arg2, Map, Env, Eval, State) -> case Eval of neg -> {Map2, t_atom(false)}; dont_know -> {Map2, t_atom(false)}; - pos -> signal_guard_fail(Guard, [Type1, Type2], State) + pos -> signal_guard_fail(Eval, Guard, [Type1, Type2], State) end; false -> case Eval of @@ -2199,29 +2201,29 @@ bind_eqeq_guard(Guard, Arg1, Arg2, Map, Env, Eval, State) -> end. bind_eqeq_guard_lit_other(Guard, Arg1, Arg2, Map, Env, State) -> - %% Assumes positive evaluation + Eval = dont_know, case cerl:concrete(Arg1) of true -> {_, Type} = MT = bind_guard(Arg2, Map, Env, pos, State), case t_is_atom(true, Type) of true -> MT; false -> - {_, Type0} = bind_guard(Arg2, Map, Env, dont_know, State), - signal_guard_fail(Guard, [Type0, t_atom(true)], State) + {_, Type0} = bind_guard(Arg2, Map, Env, Eval, State), + signal_guard_fail(Eval, Guard, [Type0, t_atom(true)], State) end; false -> {Map1, Type} = bind_guard(Arg2, Map, Env, neg, State), case t_is_atom(false, Type) of true -> {Map1, t_atom(true)}; false -> - {_, Type0} = bind_guard(Arg2, Map, Env, dont_know, State), - signal_guard_fail(Guard, [Type0, t_atom(true)], State) + {_, Type0} = bind_guard(Arg2, Map, Env, Eval, State), + signal_guard_fail(Eval, Guard, [Type0, t_atom(true)], State) end; Term -> LitType = t_from_term(Term), - {Map1, Type} = bind_guard(Arg2, Map, Env, dont_know, State), + {Map1, Type} = bind_guard(Arg2, Map, Env, Eval, State), case t_is_subtype(LitType, Type) of - false -> signal_guard_fail(Guard, [Type, LitType], State); + false -> signal_guard_fail(Eval, Guard, [Type, LitType], State); true -> case cerl:is_c_var(Arg2) of true -> {enter_type(Arg2, LitType, Map1), t_atom(true)}; @@ -2250,31 +2252,37 @@ handle_guard_and(Guard, Map, Env, Eval, State) -> catch throw:{fail, _} -> bind_guard(Arg2, Map, Env, pos, State) end, {Map2, Type2} = - try bind_guard(Arg1, Map, Env, neg, State) - catch throw:{fail, _} -> bind_guard(Arg2, Map, Env, pos, State) + try bind_guard(Arg2, Map, Env, neg, State) + catch throw:{fail, _} -> bind_guard(Arg1, Map, Env, pos, State) end, case t_is_atom(false, Type1) orelse t_is_atom(false, Type2) of true -> {join_maps([Map1, Map2], Map), t_atom(false)}; false -> throw({fail, none}) end; dont_know -> - True = t_atom(true), {Map1, Type1} = bind_guard(Arg1, Map, Env, dont_know, State), - case t_is_none(t_inf(Type1, t_boolean())) of - true -> throw({fail, none}); + {Map2, Type2} = bind_guard(Arg2, Map, Env, dont_know, State), + Bool1 = t_inf(Type1, t_boolean()), + Bool2 = t_inf(Type2, t_boolean()), + case t_is_none(Bool1) orelse t_is_none(Bool2) of + true -> throw({fatal_fail, none}); false -> - {Map2, Type2} = bind_guard(Arg2, Map1, Env, Eval, State), - case t_is_none(t_inf(Type2, t_boolean())) of - true -> throw({fail, none}); - false -> {Map2, True} - end + NewMap = join_maps([Map1, Map2], Map), + NewType = + case {t_atom_vals(Bool1), t_atom_vals(Bool2)} of + {['true'] , ['true'] } -> t_atom(true); + {['false'], _ } -> t_atom(false); + {_ , ['false']} -> t_atom(false); + {_ , _ } -> t_boolean() + end, + {NewMap, NewType} end end. handle_guard_or(Guard, Map, Env, Eval, State) -> [Arg1, Arg2] = cerl:call_args(Guard), case Eval of - pos -> + pos -> {Map1, Bool1} = try bind_guard(Arg1, Map, Env, pos, State) catch @@ -2303,11 +2311,22 @@ handle_guard_or(Guard, Map, Env, Eval, State) -> end end; dont_know -> - {Map1, Bool1} = bind_guard(Arg1, Map, Env, dont_know, State), - {Map2, Bool2} = bind_guard(Arg2, Map, Env, dont_know, State), - case t_is_boolean(Bool1) andalso t_is_boolean(Bool2) of - true -> {join_maps([Map1, Map2], Map), t_sup(Bool1, Bool2)}; - false -> throw({fail, none}) + {Map1, Type1} = bind_guard(Arg1, Map, Env, dont_know, State), + {Map2, Type2} = bind_guard(Arg2, Map, Env, dont_know, State), + Bool1 = t_inf(Type1, t_boolean()), + Bool2 = t_inf(Type2, t_boolean()), + case t_is_none(Bool1) orelse t_is_none(Bool2) of + true -> throw({fatal_fail, none}); + false -> + NewMap = join_maps([Map1, Map2], Map), + NewType = + case {t_atom_vals(Bool1), t_atom_vals(Bool2)} of + {['false'], ['false']} -> t_atom(false); + {['true'] , _ } -> t_atom(true); + {_ , ['true'] } -> t_atom(true); + {_ , _ } -> t_boolean() + end, + {NewMap, NewType} end end. @@ -2349,10 +2368,12 @@ bind_guard_list([G|Gs], Map, Env, Eval, State, Acc) -> bind_guard_list([], Map, _Env, _Eval, _State, Acc) -> {Map, lists:reverse(Acc)}. --spec signal_guard_fail(cerl:c_call(), [erl_types:erl_type()], state()) -> - no_return(). +-type eval() :: 'pos' | 'neg' | 'dont_know'. + +-spec signal_guard_fail(eval(), cerl:c_call(), [erl_types:erl_type()], + state()) -> no_return(). -signal_guard_fail(Guard, ArgTypes, State) -> +signal_guard_fail(Eval, Guard, ArgTypes, State) -> Args = cerl:call_args(Guard), F = cerl:atom_val(cerl:call_name(Guard)), MFA = {cerl:atom_val(cerl:call_module(Guard)), F, length(Args)}, @@ -2365,7 +2386,7 @@ signal_guard_fail(Guard, ArgTypes, State) -> atom_to_list(F), format_args_1([Arg2], [ArgType2], State)]}; false -> - mk_guard_msg(F, Args, ArgTypes, State) + mk_guard_msg(Eval, F, Args, ArgTypes, State) end, throw({fail, {Guard, Msg}}). @@ -2380,20 +2401,25 @@ is_infix_op({erlang, '>=', 2}) -> true; is_infix_op({M, F, A}) when is_atom(M), is_atom(F), is_integer(A), 0 =< A, A =< 255 -> false. --spec signal_guard_fatal_fail(cerl:c_call(), [erl_types:erl_type()], state()) -> - no_return(). +-spec signal_guard_fatal_fail(eval(), cerl:c_call(), [erl_types:erl_type()], + state()) -> no_return(). -signal_guard_fatal_fail(Guard, ArgTypes, State) -> +signal_guard_fatal_fail(Eval, Guard, ArgTypes, State) -> Args = cerl:call_args(Guard), F = cerl:atom_val(cerl:call_name(Guard)), - Msg = mk_guard_msg(F, Args, ArgTypes, State), + Msg = mk_guard_msg(Eval, F, Args, ArgTypes, State), throw({fatal_fail, {Guard, Msg}}). -mk_guard_msg(F, Args, ArgTypes, State) -> +mk_guard_msg(Eval, F, Args, ArgTypes, State) -> FArgs = [F, format_args(Args, ArgTypes, State)], case any_has_opaque_subtype(ArgTypes) of true -> {opaque_guard, FArgs}; - false -> {guard_fail, FArgs} + false -> + case Eval of + neg -> {neg_guard_fail, FArgs}; + pos -> {guard_fail, FArgs}; + dont_know -> {guard_fail, FArgs} + end end. bind_guard_case_clauses(Arg, Clauses, Map, Env, Eval, State) -> |