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-rw-r--r--lib/dialyzer/src/dialyzer_dataflow.erl24
-rw-r--r--lib/dialyzer/src/dialyzer_typesig.erl18
-rw-r--r--lib/dialyzer/src/dialyzer_utils.erl51
3 files changed, 84 insertions, 9 deletions
diff --git a/lib/dialyzer/src/dialyzer_dataflow.erl b/lib/dialyzer/src/dialyzer_dataflow.erl
index a3b3e3291c..9827fda6e3 100644
--- a/lib/dialyzer/src/dialyzer_dataflow.erl
+++ b/lib/dialyzer/src/dialyzer_dataflow.erl
@@ -1482,7 +1482,9 @@ bind_pat_vars([Pat|PatLeft], [Type|TypeLeft], Acc, Map, State, Rev) ->
{NewMap, TypeOut} =
case cerl:type(Pat) of
alias ->
- AliasPat = cerl:alias_pat(Pat),
+ %% Map patterns are more allowing than the type of their literal. We
+ %% must unfold AliasPat if it is a literal.
+ AliasPat = dialyzer_utils:refold_pattern(cerl:alias_pat(Pat)),
Var = cerl:alias_var(Pat),
Map1 = enter_subst(Var, AliasPat, Map),
{Map2, [PatType]} = bind_pat_vars([AliasPat], [Type], [],
@@ -1523,11 +1525,20 @@ bind_pat_vars([Pat|PatLeft], [Type|TypeLeft], Acc, Map, State, Rev) ->
{Map1, t_cons(HdType, TlType)}
end;
literal ->
- Literal = literal_type(Pat),
- case t_is_none(t_inf(Literal, Type, Opaques)) of
+ Pat0 = dialyzer_utils:refold_pattern(Pat),
+ case cerl:is_literal(Pat0) of
true ->
- bind_opaque_pats(Literal, Type, Pat, State);
- false -> {Map, Literal}
+ Literal = literal_type(Pat),
+ case t_is_none(t_inf(Literal, Type, Opaques)) of
+ true ->
+ bind_opaque_pats(Literal, Type, Pat, State);
+ false -> {Map, Literal}
+ end;
+ false ->
+ %% Retry with the unfolded pattern
+ {Map1, [PatType]}
+ = bind_pat_vars([Pat0], [Type], [], Map, State, Rev),
+ {Map1, PatType}
end;
map ->
MapT = t_inf(Type, t_map(), Opaques),
@@ -2742,8 +2753,9 @@ store_map(Key, Val, #map{dict = Dict, ref = undefined} = Map) ->
store_map(Key, Val, #map{dict = Dict, modified = Mod} = Map) ->
Map#map{dict = dict:store(Key, Val, Dict), modified = [Key | Mod]}.
-enter_subst(Key, Val, #map{subst = Subst} = MS) ->
+enter_subst(Key, Val0, #map{subst = Subst} = MS) ->
KeyLabel = get_label(Key),
+ Val = dialyzer_utils:refold_pattern(Val0),
case cerl:is_literal(Val) of
true ->
store_map(KeyLabel, literal_type(Val), MS);
diff --git a/lib/dialyzer/src/dialyzer_typesig.erl b/lib/dialyzer/src/dialyzer_typesig.erl
index 12d6673d28..810b7c55e9 100644
--- a/lib/dialyzer/src/dialyzer_typesig.erl
+++ b/lib/dialyzer/src/dialyzer_typesig.erl
@@ -393,8 +393,18 @@ traverse(Tree, DefinedVars, State) ->
{State2, _} = traverse_list(Funs, DefinedVars1, State1),
traverse(Body, DefinedVars1, State2);
literal ->
- Type = t_from_term(cerl:concrete(Tree)),
- {State, Type};
+ %% Maps are special; a literal pattern matches more than just the value
+ %% constructed by the literal. For example #{} constructs the empty map,
+ %% but matches every map.
+ case state__is_in_match(State) of
+ true ->
+ Tree1 = dialyzer_utils:refold_pattern(Tree),
+ case cerl:is_literal(Tree1) of
+ false -> traverse(Tree1, DefinedVars, State);
+ true -> {State, t_from_term(cerl:concrete(Tree))}
+ end;
+ _ -> {State, t_from_term(cerl:concrete(Tree))}
+ end;
module ->
Defs = cerl:module_defs(Tree),
Funs = [Fun || {_Var, Fun} <- Defs],
@@ -1110,7 +1120,9 @@ bitstr_val_constr(SizeType, UnitVal, Flags) ->
end
end.
-get_safe_underapprox_1([Pat|Left], Acc, Map) ->
+get_safe_underapprox_1([Pat0|Left], Acc, Map) ->
+ %% Maps should be treated as patterns, not as literals
+ Pat = dialyzer_utils:refold_pattern(Pat0),
case cerl:type(Pat) of
alias ->
APat = cerl:alias_pat(Pat),
diff --git a/lib/dialyzer/src/dialyzer_utils.erl b/lib/dialyzer/src/dialyzer_utils.erl
index 5fc1c0e691..b3505f5197 100644
--- a/lib/dialyzer/src/dialyzer_utils.erl
+++ b/lib/dialyzer/src/dialyzer_utils.erl
@@ -49,6 +49,7 @@
process_record_remote_types/1,
sets_filter/2,
src_compiler_opts/0,
+ refold_pattern/1,
parallelism/0,
family/1
]).
@@ -834,6 +835,56 @@ pp_atom(Atom) ->
%%------------------------------------------------------------------------------
+-spec refold_pattern(cerl:cerl()) -> cerl:cerl().
+
+refold_pattern(Pat) ->
+ %% Avoid the churn of unfolding and refolding
+ case cerl:is_literal(Pat) andalso find_map(cerl:concrete(Pat)) of
+ true ->
+ Tree = refold_concrete_pat(cerl:concrete(Pat)),
+ [{label, Label}] = cerl:get_ann(Tree),
+ cerl:set_ann(Tree, [{label, Label}|cerl:get_ann(Pat)]);
+ false -> Pat
+ end.
+
+find_map(#{}) -> true;
+find_map(Tuple) when is_tuple(Tuple) -> find_map(tuple_to_list(Tuple));
+find_map([H|T]) -> find_map(H) orelse find_map(T);
+find_map(_) -> false.
+
+refold_concrete_pat(Val) ->
+ case Val of
+ _ when is_tuple(Val) ->
+ Els = lists:map(fun refold_concrete_pat/1, tuple_to_list(Val)),
+ case lists:all(fun cerl:is_literal/1, Els) of
+ true -> cerl:abstract(Val);
+ false -> label(cerl:c_tuple_skel(Els))
+ end;
+ [H|T] ->
+ case cerl:is_literal(HP=refold_concrete_pat(H))
+ and cerl:is_literal(TP=refold_concrete_pat(T))
+ of
+ true -> cerl:abstract(Val);
+ false -> label(cerl:c_cons_skel(HP, TP))
+ end;
+ M when is_map(M) ->
+ %% Map patterns are not generated by the parser(!), but they have a
+ %% property we want, namely that they are never folded into literals.
+ %% N.B.: The key in a map pattern is an expression, *not* a pattern.
+ label(cerl:c_map_pattern([cerl:c_map_pair_exact(cerl:abstract(K),
+ refold_concrete_pat(V))
+ || {K, V} <- maps:to_list(M)]));
+ _ ->
+ cerl:abstract(Val)
+ end.
+
+label(Tree) ->
+ %% Sigh
+ Label = -erlang:unique_integer([positive]),
+ cerl:set_ann(Tree, [{label, Label}]).
+
+%%------------------------------------------------------------------------------
+
-spec parallelism() -> integer().
parallelism() ->
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-15 00:11:26 +0000