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authorHans Bolinder <[email protected]>2014-08-19 16:16:08 +0200
committerHans Bolinder <[email protected]>2014-08-20 16:53:56 +0200
commit6e422d499fe079b87cfa226491b11016f36b9a31 (patch)
tree1b795507c5c1a4eff77ddf0991669a71154b9e67
parentc56edba2912e12f15226a1e130fdfac25c29b98f (diff)
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dialyzer: fix a -Wunderspecs bug
Sometimes bogus warnings were generated for parametrized types. Thanks to Krzesimir Sarnecki for pointing the bug out. Also corrected warnings where the structure of opaque types were exposed (thanks to Kostis for pointing the bug out).
-rw-r--r--lib/dialyzer/src/dialyzer_contracts.erl7
-rw-r--r--lib/dialyzer/test/underspecs_SUITE_data/results/arr4
-rw-r--r--lib/dialyzer/test/underspecs_SUITE_data/src/arr.erl41
3 files changed, 48 insertions, 4 deletions
diff --git a/lib/dialyzer/src/dialyzer_contracts.erl b/lib/dialyzer/src/dialyzer_contracts.erl
index 1d2dfc7b2d..f27fc1a842 100644
--- a/lib/dialyzer/src/dialyzer_contracts.erl
+++ b/lib/dialyzer/src/dialyzer_contracts.erl
@@ -20,8 +20,6 @@
-module(dialyzer_contracts).
--compile(export_all).
-
-export([check_contract/2,
check_contracts/4,
contracts_without_fun/3,
@@ -686,7 +684,7 @@ picky_contract_check(CSig0, Sig0, MFA, FileLine, Contract, RecDict, Acc) ->
true -> Acc;
false ->
case extra_contract_warning(MFA, FileLine, Contract,
- CSig, Sig, RecDict) of
+ CSig0, Sig0, RecDict) of
no_warning -> Acc;
{warning, Warning} -> [Warning|Acc]
end
@@ -752,7 +750,8 @@ is_remote_types_related(Contract, CSig, Sig, RecDict) ->
t_from_forms_without_remote([{FType, []}], RecDict) ->
Type0 = erl_types:t_from_form(FType, RecDict),
- {ok, erl_types:subst_all_remote(Type0, erl_types:t_none())};
+ Type1 = erl_types:subst_all_remote(Type0, erl_types:t_none()),
+ {ok, erl_types:subst_all_vars_to_any(Type1)};
t_from_forms_without_remote([{_FType, _Constrs}], _RecDict) ->
%% 'When' constraints
unsupported;
diff --git a/lib/dialyzer/test/underspecs_SUITE_data/results/arr b/lib/dialyzer/test/underspecs_SUITE_data/results/arr
new file mode 100644
index 0000000000..9497d12eec
--- /dev/null
+++ b/lib/dialyzer/test/underspecs_SUITE_data/results/arr
@@ -0,0 +1,4 @@
+
+arr.erl:14: Type specification arr:test2(array:array(T),non_neg_integer(),T) -> array:array(T) is a supertype of the success typing: arr:test2(array:array(_),pos_integer(),_) -> array:array(_)
+arr.erl:24: Type specification arr:test4(array:array(T),non_neg_integer(),_) -> array:array(T) is a supertype of the success typing: arr:test4(array:array(_),pos_integer(),_) -> array:array(_)
+arr.erl:29: Type specification arr:test5(array:array(T),non_neg_integer(),T) -> array:array(T) is a supertype of the success typing: arr:test5(array:array(_),non_neg_integer(),integer()) -> array:array(_)
diff --git a/lib/dialyzer/test/underspecs_SUITE_data/src/arr.erl b/lib/dialyzer/test/underspecs_SUITE_data/src/arr.erl
new file mode 100644
index 0000000000..3b265ccec2
--- /dev/null
+++ b/lib/dialyzer/test/underspecs_SUITE_data/src/arr.erl
@@ -0,0 +1,41 @@
+-module(arr).
+
+%% http://erlang.org/pipermail/erlang-questions/2014-August/080445.html
+
+-define(A, array).
+
+-export([test/3, test2/3, test3/3, test4/3, test5/3, test6/3]).
+
+-spec test(?A:array(T), non_neg_integer(), T) -> ?A:array(T).
+
+test(Array, N, Value) ->
+ ?A:set(N, Value, Array).
+
+-spec test2(?A:array(T), non_neg_integer(), T) -> ?A:array(T).
+
+test2(Array, N, Value) when N > 0 ->
+ ?A:set(N, Value, Array).
+
+-spec test3(?A:array(T), non_neg_integer(), _) -> ?A:array(T).
+
+test3(Array, N, Value) ->
+ ?A:set(N, Value, Array).
+
+-spec test4(?A:array(T), non_neg_integer(), _) -> ?A:array(T).
+
+test4(Array, N, Value) when N > 0 ->
+ ?A:set(N, Value, Array).
+
+-spec test5(?A:array(T), non_neg_integer(), T) -> ?A:array(T).
+
+test5(Array, N, Value) when is_integer(Value) ->
+ ?A:set(N, Value, Array).
+
+%% One would ideally want a warning also for test6(), but the current
+%% analysis of parametrized opaque types is not strong enough to
+%% discover this.
+-spec test6(?A:array(integer()), non_neg_integer(), integer()) ->
+ ?A:array(any()).
+
+test6(Array, N, Value) ->
+ ?A:set(N, Value, Array).