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authorHans Bolinder <hasse@erlang.org>2015-08-20 15:52:33 +0200
committerHans Bolinder <hasse@erlang.org>2015-09-04 08:24:58 +0200
commit3092fc21c57a34a7ee5e2699ba39bb37edd8c4d8 (patch)
tree9c0b3140027f90f524cca0adf461ac19f0ddd9a5 /lib/hipe
parent3af9e6ef9bd6a9e9faf0e5bf683f4f1c5c0c0ca9 (diff)
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dialyzer: Fix erlang:abs/1
Fix the range type of erlang:abs/1.
Diffstat (limited to 'lib/hipe')
-rw-r--r--lib/hipe/cerl/erl_bif_types.erl29
1 files changed, 26 insertions, 3 deletions
diff --git a/lib/hipe/cerl/erl_bif_types.erl b/lib/hipe/cerl/erl_bif_types.erl
index f49089d41c..5387edfb47 100644
--- a/lib/hipe/cerl/erl_bif_types.erl
+++ b/lib/hipe/cerl/erl_bif_types.erl
@@ -514,14 +514,15 @@ type(erlang, 'bsl', 2, Xs, Opaques) ->
type(erlang, 'bnot', 1, Xs, Opaques) ->
strict(erlang, 'bnot', 1, Xs,
fun ([X1]) ->
- case arith('bnot', X1, Opaques) of
+ case arith_bnot(X1, Opaques) of
error -> t_integer();
{ok, T} -> T
end
end, Opaques);
%% Guard bif, needs to be here.
type(erlang, abs, 1, Xs, Opaques) ->
- strict(erlang, abs, 1, Xs, fun ([X]) -> X end, Opaques);
+ strict(erlang, abs, 1, Xs,
+ fun ([X1]) -> arith_abs(X1, Opaques) end, Opaques);
%% This returns (-X)-1, so it often gives a negative result.
%% strict(erlang, 'bnot', 1, Xs, fun (_) -> t_integer() end, Opaques);
type(erlang, append, 2, Xs, _Opaques) -> type(erlang, '++', 2, Xs); % alias
@@ -1927,7 +1928,7 @@ negwidth(X, N) ->
false -> negwidth(X, N+1)
end.
-arith('bnot', X1, Opaques) ->
+arith_bnot(X1, Opaques) ->
case t_is_integer(X1, Opaques) of
false -> error;
true ->
@@ -1937,6 +1938,28 @@ arith('bnot', X1, Opaques) ->
infinity_add(infinity_inv(Min1), -1))}
end.
+arith_abs(X1, Opaques) ->
+ case t_is_integer(X1, Opaques) of
+ false ->
+ case t_is_float(X1, Opaques) of
+ true -> t_float();
+ false -> t_number()
+ end;
+ true ->
+ Min1 = number_min(X1, Opaques),
+ Max1 = number_max(X1, Opaques),
+ {NewMin, NewMax} =
+ case infinity_geq(Min1, 0) of
+ true -> {Min1, Max1};
+ false ->
+ case infinity_geq(Max1, 0) of
+ true -> {0, infinity_inv(Min1)};
+ false -> {infinity_inv(Max1), infinity_inv(Min1)}
+ end
+ end,
+ t_from_range(NewMin, NewMax)
+ end.
+
arith_mult(Min1, Max1, Min2, Max2) ->
Tmp_list = [infinity_mult(Min1, Min2), infinity_mult(Min1, Max2),
infinity_mult(Max1, Min2), infinity_mult(Max1, Max2)],