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-rw-r--r--lib/dialyzer/src/dialyzer.erl2
-rw-r--r--lib/dialyzer/src/dialyzer_dataflow.erl120
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) ->
generated by cgit v1.2.3 (git 2.25.1) at 2024-12-01 04:45:34 +0000