diff options
Diffstat (limited to 'lib/compiler/src/beam_ssa_type.erl')
-rw-r--r-- | lib/compiler/src/beam_ssa_type.erl | 67 |
1 files changed, 67 insertions, 0 deletions
diff --git a/lib/compiler/src/beam_ssa_type.erl b/lib/compiler/src/beam_ssa_type.erl index c040fb2dde..aa4720d222 100644 --- a/lib/compiler/src/beam_ssa_type.erl +++ b/lib/compiler/src/beam_ssa_type.erl @@ -884,6 +884,9 @@ type(call, [#b_remote{mod=#b_literal{val=Mod}, end; {erlang,'--',[_,_]} -> list; + {lists,F,Args} -> + Types = get_types(Args, Ts), + lists_function_type(F, Types); {math,_,_} -> case is_math_bif(Name, length(Args)) of false -> any; @@ -975,6 +978,70 @@ arith_op_type(Args, Ts) -> (_, _) -> none end, unknown, Types). +lists_function_type(F, Types) -> + case {F,Types} of + %% Functions that return booleans. + {all,[_,_]} -> + t_boolean(); + {any,[_,_]} -> + t_boolean(); + {keymember,[_,_,_]} -> + t_boolean(); + {member,[_,_]} -> + t_boolean(); + {prefix,[_,_]} -> + t_boolean(); + {suffix,[_,_]} -> + t_boolean(); + + %% Functions that return lists. + {dropwhile,[_,_]} -> + list; + {duplicate,[_,_]} -> + list; + {filter,[_,_]} -> + list; + {flatten,[_]} -> + list; + {map,[_Fun,List]} -> + same_length_type(List); + {MapFold,[_Fun,_Acc,List]} when MapFold =:= mapfoldl; + MapFold =:= mapfoldr -> + #t_tuple{size=2,exact=true, + elements=#{1=>same_length_type(List)}}; + {partition,[_,_]} -> + t_two_tuple(list, list); + {reverse,[List]} -> + same_length_type(List); + {sort,[List]} -> + same_length_type(List); + {splitwith,[_,_]} -> + t_two_tuple(list, list); + {takewhile,[_,_]} -> + list; + {unzip,[List]} -> + ListType = same_length_type(List), + t_two_tuple(ListType, ListType); + {usort,[List]} -> + same_length_type(List); + {zip,[_,_]} -> + list; + {zipwith,[_,_,_]} -> + list; + {_,_} -> + any + end. + +%% For a lists function that return a list of the same +%% length as the input list, return the type of the list. +same_length_type(cons) -> cons; +same_length_type(nil) -> nil; +same_length_type(_) -> list. + +t_two_tuple(Type1, Type2) -> + #t_tuple{size=2,exact=true, + elements=#{1=>Type1,2=>Type2}}. + %% will_succeed(TestOperation, Type) -> yes|no|maybe. %% Test whether TestOperation applied to an argument of type Type %% will succeed. Return yes, no, or maybe. |