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authorHans Bolinder <[email protected]>2017-01-02 21:05:52 +0100
committerHans Bolinder <[email protected]>2017-01-10 09:54:43 +0100
commit1a7c41be2b35df26acb81bb03a96b4e97f0fd750 (patch)
tree0948dae9272f7b506141f13c96153d33d185227f /lib/hipe/cerl
parent61547cab473396ac5ec03b491fd74c8fe7e7ce54 (diff)
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dialyzer: Fix check of parameterized opaque types
Two parameters used to be "compatible" if one is a specialization of the other, in the way that the input type of t_limit() is a specialization of the output type. This check is now relaxed: any() in any of the two parameters is compatible with any type of the other parameter. The change is due to bugus warnings. A clause for maps has been added.
Diffstat (limited to 'lib/hipe/cerl')
-rw-r--r--lib/hipe/cerl/erl_types.erl137
1 files changed, 70 insertions, 67 deletions
diff --git a/lib/hipe/cerl/erl_types.erl b/lib/hipe/cerl/erl_types.erl
index 226a5d0f61..25dbfb2dbd 100644
--- a/lib/hipe/cerl/erl_types.erl
+++ b/lib/hipe/cerl/erl_types.erl
@@ -2,7 +2,7 @@
%%
%% %CopyrightBegin%
%%
-%% Copyright Ericsson AB 2003-2016. All Rights Reserved.
+%% Copyright Ericsson AB 2003-2017. All Rights Reserved.
%%
%% Licensed under the Apache License, Version 2.0 (the "License");
%% you may not use this file except in compliance with the License.
@@ -3067,88 +3067,91 @@ is_compat_args([A1|Args1], [A2|Args2]) ->
is_compat_args([], []) -> true;
is_compat_args(_, _) -> false.
-is_compat_arg(A1, A2) ->
- is_specialization(A1, A2) orelse is_specialization(A2, A1).
-
--spec is_specialization(erl_type(), erl_type()) -> boolean().
-
-%% Returns true if the first argument is a specialization of the
-%% second argument in the sense that every type is a specialization of
-%% any(). For example, {_,_} is a specialization of any(), but not of
-%% tuple(). Does not handle variables, but any() and unions (sort of).
-
-is_specialization(T, T) -> true;
-is_specialization(_, ?any) -> true;
-is_specialization(?any, _) -> false;
-is_specialization(?function(Domain1, Range1), ?function(Domain2, Range2)) ->
- (is_specialization(Domain1, Domain2) andalso
- is_specialization(Range1, Range2));
-is_specialization(?list(Contents1, Termination1, Size1),
- ?list(Contents2, Termination2, Size2)) ->
+-spec is_compat_arg(erl_type(), erl_type()) -> boolean().
+
+%% The intention is that 'true' is to be returned iff one of the
+%% arguments is a specialization of the other argument in the sense
+%% that every type is a specialization of any(). For example, {_,_} is
+%% a specialization of any(), but not of tuple(). Does not handle
+%% variables, but any() and unions (sort of). However, the
+%% implementation is more relaxed as any() is compatible to anything.
+
+is_compat_arg(T, T) -> true;
+is_compat_arg(_, ?any) -> true;
+is_compat_arg(?any, _) -> true;
+is_compat_arg(?function(Domain1, Range1), ?function(Domain2, Range2)) ->
+ (is_compat_arg(Domain1, Domain2) andalso
+ is_compat_arg(Range1, Range2));
+is_compat_arg(?list(Contents1, Termination1, Size1),
+ ?list(Contents2, Termination2, Size2)) ->
(Size1 =:= Size2 andalso
- is_specialization(Contents1, Contents2) andalso
- is_specialization(Termination1, Termination2));
-is_specialization(?product(Types1), ?product(Types2)) ->
- specialization_list(Types1, Types2);
-is_specialization(?tuple(?any, ?any, ?any), ?tuple(_, _, _)) -> false;
-is_specialization(?tuple(_, _, _), ?tuple(?any, ?any, ?any)) -> false;
-is_specialization(?tuple(Elements1, Arity, _),
- ?tuple(Elements2, Arity, _)) when Arity =/= ?any ->
- specialization_list(Elements1, Elements2);
-is_specialization(?tuple_set([{Arity, List}]),
- ?tuple(Elements2, Arity, _)) when Arity =/= ?any ->
- specialization_list(sup_tuple_elements(List), Elements2);
-is_specialization(?tuple(Elements1, Arity, _),
- ?tuple_set([{Arity, List}])) when Arity =/= ?any ->
- specialization_list(Elements1, sup_tuple_elements(List));
-is_specialization(?tuple_set(List1), ?tuple_set(List2)) ->
+ is_compat_arg(Contents1, Contents2) andalso
+ is_compat_arg(Termination1, Termination2));
+is_compat_arg(?product(Types1), ?product(Types2)) ->
+ is_compat_list(Types1, Types2);
+is_compat_arg(?map(Pairs1, DefK1, DefV1), ?map(Pairs2, DefK2, DefV2)) ->
+ (is_compat_list(Pairs1, Pairs2) andalso
+ is_compat_arg(DefK1, DefK2) andalso
+ is_compat_arg(DefV1, DefV2));
+is_compat_arg(?tuple(?any, ?any, ?any), ?tuple(_, _, _)) -> false;
+is_compat_arg(?tuple(_, _, _), ?tuple(?any, ?any, ?any)) -> false;
+is_compat_arg(?tuple(Elements1, Arity, _),
+ ?tuple(Elements2, Arity, _)) when Arity =/= ?any ->
+ is_compat_list(Elements1, Elements2);
+is_compat_arg(?tuple_set([{Arity, List}]),
+ ?tuple(Elements2, Arity, _)) when Arity =/= ?any ->
+ is_compat_list(sup_tuple_elements(List), Elements2);
+is_compat_arg(?tuple(Elements1, Arity, _),
+ ?tuple_set([{Arity, List}])) when Arity =/= ?any ->
+ is_compat_list(Elements1, sup_tuple_elements(List));
+is_compat_arg(?tuple_set(List1), ?tuple_set(List2)) ->
try
- specialization_list_list([sup_tuple_elements(T) || {_Arity, T} <- List1],
- [sup_tuple_elements(T) || {_Arity, T} <- List2])
+ is_compat_list_list([sup_tuple_elements(T) || {_Arity, T} <- List1],
+ [sup_tuple_elements(T) || {_Arity, T} <- List2])
catch _:_ -> false
end;
-is_specialization(?opaque(_) = T1, T2) ->
- is_specialization(t_opaque_structure(T1), T2);
-is_specialization(T1, ?opaque(_) = T2) ->
- is_specialization(T1, t_opaque_structure(T2));
-is_specialization(?union(List1)=T1, ?union(List2)=T2) ->
- case specialization_union2(T1, T2) of
- {yes, Type1, Type2} -> is_specialization(Type1, Type2);
- no -> specialization_list(List1, List2)
+is_compat_arg(?opaque(_) = T1, T2) ->
+ is_compat_arg(t_opaque_structure(T1), T2);
+is_compat_arg(T1, ?opaque(_) = T2) ->
+ is_compat_arg(T1, t_opaque_structure(T2));
+is_compat_arg(?union(List1)=T1, ?union(List2)=T2) ->
+ case is_compat_union2(T1, T2) of
+ {yes, Type1, Type2} -> is_compat_arg(Type1, Type2);
+ no -> is_compat_list(List1, List2)
end;
-is_specialization(?union(List), T2) ->
+is_compat_arg(?union(List), T2) ->
case unify_union(List) of
- {yes, Type} -> is_specialization(Type, T2);
+ {yes, Type} -> is_compat_arg(Type, T2);
no -> false
end;
-is_specialization(T1, ?union(List)) ->
+is_compat_arg(T1, ?union(List)) ->
case unify_union(List) of
- {yes, Type} -> is_specialization(T1, Type);
+ {yes, Type} -> is_compat_arg(T1, Type);
no -> false
end;
-is_specialization(?var(_), _) -> exit(error);
-is_specialization(_, ?var(_)) -> exit(error);
-is_specialization(?none, _) -> false;
-is_specialization(_, ?none) -> false;
-is_specialization(?unit, _) -> false;
-is_specialization(_, ?unit) -> false;
-is_specialization(#c{}, #c{}) -> false.
+is_compat_arg(?var(_), _) -> exit(error);
+is_compat_arg(_, ?var(_)) -> exit(error);
+is_compat_arg(?none, _) -> false;
+is_compat_arg(_, ?none) -> false;
+is_compat_arg(?unit, _) -> false;
+is_compat_arg(_, ?unit) -> false;
+is_compat_arg(#c{}, #c{}) -> false.
-specialization_list_list(LL1, LL2) ->
- length(LL1) =:= length(LL2) andalso specialization_list_list1(LL1, LL2).
+is_compat_list_list(LL1, LL2) ->
+ length(LL1) =:= length(LL2) andalso is_compat_list_list1(LL1, LL2).
-specialization_list_list1([], []) -> true;
-specialization_list_list1([L1|LL1], [L2|LL2]) ->
- specialization_list(L1, L2) andalso specialization_list_list1(LL1, LL2).
+is_compat_list_list1([], []) -> true;
+is_compat_list_list1([L1|LL1], [L2|LL2]) ->
+ is_compat_list(L1, L2) andalso is_compat_list_list1(LL1, LL2).
-specialization_list(L1, L2) ->
- length(L1) =:= length(L2) andalso specialization_list1(L1, L2).
+is_compat_list(L1, L2) ->
+ length(L1) =:= length(L2) andalso is_compat_list1(L1, L2).
-specialization_list1([], []) -> true;
-specialization_list1([T1|L1], [T2|L2]) ->
- is_specialization(T1, T2) andalso specialization_list1(L1, L2).
+is_compat_list1([], []) -> true;
+is_compat_list1([T1|L1], [T2|L2]) ->
+ is_compat_arg(T1, T2) andalso is_compat_list1(L1, L2).
-specialization_union2(?union(List1)=T1, ?union(List2)=T2) ->
+is_compat_union2(?union(List1)=T1, ?union(List2)=T2) ->
case {unify_union(List1), unify_union(List2)} of
{{yes, Type1}, {yes, Type2}} -> {yes, Type1, Type2};
{{yes, Type1}, no} -> {yes, Type1, T2};