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authorStavros Aronis <[email protected]>2011-03-08 15:28:09 +0200
committerNiclas Axelsson <[email protected]>2011-03-11 12:03:53 +0100
commitf01ef637c938cf3cf295eb3ae1d579516723ee80 (patch)
treeff7eb50375461f33d638630a0c41de4d9e02efde /lib
parent8342fcf5395133a19d647f2ace606af9b7fc1732 (diff)
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More descriptive warning when a tuple pattern matches a typed record
Diffstat (limited to 'lib')
-rw-r--r--lib/dialyzer/src/dialyzer.erl3
-rw-r--r--lib/dialyzer/src/dialyzer_dataflow.erl41
2 files changed, 31 insertions, 13 deletions
diff --git a/lib/dialyzer/src/dialyzer.erl b/lib/dialyzer/src/dialyzer.erl
index 683b518831..5014a4244c 100644
--- a/lib/dialyzer/src/dialyzer.erl
+++ b/lib/dialyzer/src/dialyzer.erl
@@ -368,6 +368,9 @@ message_to_string({record_constr, [Name, Field, Type]}) ->
message_to_string({record_matching, [String, Name]}) ->
io_lib:format("The ~s violates the"
" declared type for #~w{}\n", [String, Name]);
+message_to_string({record_match, [Pat, Type]}) ->
+ io_lib:format("Matching of ~s tagged with a record name violates the declared"
+ " type of ~s\n", [Pat, Type]);
message_to_string({pattern_match, [Pat, Type]}) ->
io_lib:format("The ~s can never match the type ~s\n", [Pat, Type]);
message_to_string({pattern_match_cov, [Pat, Type]}) ->
diff --git a/lib/dialyzer/src/dialyzer_dataflow.erl b/lib/dialyzer/src/dialyzer_dataflow.erl
index 215b4d67c1..7137dbc036 100644
--- a/lib/dialyzer/src/dialyzer_dataflow.erl
+++ b/lib/dialyzer/src/dialyzer_dataflow.erl
@@ -1369,7 +1369,7 @@ do_clause(C, Arg, ArgType0, OrigArgType, Map,
bind_pat_vars(Pats, ArgTypes, [], Map1, State1)
end,
case BindRes of
- {error, BindOrOpaque, NewPats, Type, OpaqueTerm} ->
+ {error, ErrorType, NewPats, Type, OpaqueTerm} ->
?debug("Failed binding pattern: ~s\nto ~s\n",
[cerl_prettypr:format(C), format_type(ArgType0, State1)]),
case state__warning_mode(State1) of
@@ -1377,8 +1377,9 @@ do_clause(C, Arg, ArgType0, OrigArgType, Map,
{State1, Map, t_none(), ArgType0};
true ->
PatString =
- case BindOrOpaque of
+ case ErrorType of
bind -> format_patterns(Pats);
+ record -> format_patterns(Pats);
opaque -> format_patterns(NewPats)
end,
{Msg, Force} =
@@ -1418,13 +1419,15 @@ do_clause(C, Arg, ArgType0, OrigArgType, Map,
false ->
true
end,
- PatTypes = case BindOrOpaque of
+ PatTypes = case ErrorType of
bind -> [PatString, format_type(ArgType0, State1)];
+ record -> [PatString, format_type(Type, State1)];
opaque -> [PatString, format_type(Type, State1),
format_type(OpaqueTerm, State1)]
- end,
- FailedMsg = case BindOrOpaque of
+ end,
+ FailedMsg = case ErrorType of
bind -> {pattern_match, PatTypes};
+ record -> {record_match, PatTypes};
opaque -> {opaque_match, PatTypes}
end,
{FailedMsg, Force0}
@@ -1432,6 +1435,7 @@ do_clause(C, Arg, ArgType0, OrigArgType, Map,
WarnType = case Msg of
{opaque_match, _} -> ?WARN_OPAQUE;
{pattern_match, _} -> ?WARN_MATCHING;
+ {record_match, _} -> ?WARN_MATCHING;
{pattern_match_cov, _} -> ?WARN_MATCHING
end,
{state__add_warning(State1, WarnType, C, Msg, Force),
@@ -1525,14 +1529,18 @@ bind_pat_vars(Pats, Types, Acc, Map, State) ->
try
bind_pat_vars(Pats, Types, Acc, Map, State, false)
catch
- throw:Error -> Error % Error = {error, bind | opaque, ErrorPats, ErrorType}
+ throw:Error ->
+ %% Error = {error, bind | opaque | record, ErrorPats, ErrorType}
+ Error
end.
bind_pat_vars_reverse(Pats, Types, Acc, Map, State) ->
try
bind_pat_vars(Pats, Types, Acc, Map, State, true)
catch
- throw:Error -> Error % Error = {error, bind | opaque, ErrorPats, ErrorType}
+ throw:Error ->
+ %% Error = {error, bind | opaque | record, ErrorPats, ErrorType}
+ Error
end.
bind_pat_vars([Pat|PatLeft], [Type|TypeLeft], Acc, Map, State, Rev) ->
@@ -1587,18 +1595,21 @@ bind_pat_vars([Pat|PatLeft], [Type|TypeLeft], Acc, Map, State, Rev) ->
end;
tuple ->
Es = cerl:tuple_es(Pat),
- Prototype =
+ {TypedRecord, Prototype} =
case Es of
- [] -> t_tuple([]);
+ [] -> {false, t_tuple([])};
[Tag|Left] ->
case cerl:is_c_atom(Tag) of
true ->
TagAtom = cerl:atom_val(Tag),
case state__lookup_record(TagAtom, length(Left), State) of
- error -> t_tuple(length(Es));
- {ok, Record} -> Record
+ error -> {false, t_tuple(length(Es))};
+ {ok, Record} ->
+ [_Head|AnyTail] = [t_any() || _ <- Es],
+ UntypedRecord = t_tuple([t_atom(TagAtom)|AnyTail]),
+ {not erl_types:t_is_equal(Record, UntypedRecord), Record}
end;
- false -> t_tuple(length(Es))
+ false -> {false, t_tuple(length(Es))}
end
end,
Tuple = t_inf(Prototype, Type),
@@ -1623,7 +1634,11 @@ bind_pat_vars([Pat|PatLeft], [Type|TypeLeft], Acc, Map, State, Rev) ->
bind_error([Pat], Tuple, Opaque, opaque);
false ->
case [M || {M, _} <- Results, M =/= error] of
- [] -> bind_error([Pat], Tuple, t_none(), bind);
+ [] ->
+ case TypedRecord of
+ true -> bind_error([Pat], Tuple, Prototype, record);
+ false -> bind_error([Pat], Tuple, t_none(), bind)
+ end;
Maps ->
Map1 = join_maps(Maps, Map),
TupleType = t_sup([t_tuple(EsTypes)