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-rw-r--r--lib/compiler/src/sys_core_fold.erl171
1 files changed, 100 insertions, 71 deletions
diff --git a/lib/compiler/src/sys_core_fold.erl b/lib/compiler/src/sys_core_fold.erl
index 9c9b8031fe..b298473617 100644
--- a/lib/compiler/src/sys_core_fold.erl
+++ b/lib/compiler/src/sys_core_fold.erl
@@ -96,6 +96,10 @@
t=[], %Types
in_guard=false}). %In guard or not.
+-type type_info() :: cerl:cerl() | 'bool'.
+-type yes_no_maybe() :: 'yes' | 'no' | 'maybe'.
+-type sub() :: #sub{}.
+
-spec module(cerl:c_module(), [compile:option()]) ->
{'ok', cerl:c_module(), [_]}.
@@ -462,10 +466,7 @@ is_safe_simple(#c_call{module=#c_literal{val=erlang},
case erl_internal:bool_op(Name, NumArgs) of
true ->
%% Boolean operators are safe if the arguments are boolean.
- all(fun(#c_var{name=V}) -> is_boolean_type(V, Sub);
- (#c_literal{val=Lit}) -> is_boolean(Lit);
- (_) -> false
- end, Args);
+ all(fun(C) -> is_boolean_type(C, Sub) =:= yes end, Args);
false ->
%% We need a rather complicated test to ensure that
%% we only allow safe calls that are allowed in a guard.
@@ -1183,11 +1184,12 @@ fold_non_lit_args(Call, _, _, _, _) -> Call.
eval_rel_op(Call, Op, [#c_var{name=V},#c_var{name=V}], _) ->
Bool = erlang:Op(same, same),
#c_literal{anno=cerl:get_ann(Call),val=Bool};
-eval_rel_op(Call, '=:=', [#c_var{name=V}=Var,#c_literal{val=true}], Sub) ->
+eval_rel_op(Call, '=:=', [Term,#c_literal{val=true}], Sub) ->
%% BoolVar =:= true ==> BoolVar
- case is_boolean_type(V, Sub) of
- true -> Var;
- false -> Call
+ case is_boolean_type(Term, Sub) of
+ yes -> Term;
+ maybe -> Call;
+ no -> #c_literal{val=false}
end;
eval_rel_op(Call, '==', Ops, _Sub) ->
case is_exact_eq_ok(Ops) of
@@ -1235,40 +1237,31 @@ is_non_numeric_tuple(_Tuple, 0) -> true.
%% there must be at least one non-literal argument (i.e.
%% there is no need to handle the case that all argments
%% are literal).
-eval_bool_op(Call, 'and', [#c_literal{val=true},#c_var{name=V}=Res], Sub) ->
- case is_boolean_type(V, Sub) of
- true -> Res;
- false-> Call
- end;
-eval_bool_op(Call, 'and', [#c_var{name=V}=Res,#c_literal{val=true}], Sub) ->
- case is_boolean_type(V, Sub) of
- true -> Res;
- false-> Call
- end;
-eval_bool_op(Call, 'and', [#c_literal{val=false}=Res,#c_var{name=V}], Sub) ->
- case is_boolean_type(V, Sub) of
- true -> Res;
- false-> Call
- end;
-eval_bool_op(Call, 'and', [#c_var{name=V},#c_literal{val=false}=Res], Sub) ->
- case is_boolean_type(V, Sub) of
- true -> Res;
- false-> Call
- end;
+
+eval_bool_op(Call, 'and', [#c_literal{val=true},Term], Sub) ->
+ eval_bool_op_1(Call, Term, Term, Sub);
+eval_bool_op(Call, 'and', [Term,#c_literal{val=true}], Sub) ->
+ eval_bool_op_1(Call, Term, Term, Sub);
+eval_bool_op(Call, 'and', [#c_literal{val=false}=Res,Term], Sub) ->
+ eval_bool_op_1(Call, Res, Term, Sub);
+eval_bool_op(Call, 'and', [Term,#c_literal{val=false}=Res], Sub) ->
+ eval_bool_op_1(Call, Res, Term, Sub);
eval_bool_op(Call, _, _, _) -> Call.
+eval_bool_op_1(Call, Res, Term, Sub) ->
+ case is_boolean_type(Term, Sub) of
+ yes -> Res;
+ no -> eval_failure(Call, badarg);
+ maybe -> Call
+ end.
+
%% Evaluate is_boolean/1 using type information.
-eval_is_boolean(Call, #c_var{name=V}, Sub) ->
- case is_boolean_type(V, Sub) of
- true -> #c_literal{val=true};
- false -> Call
- end;
-eval_is_boolean(_, #c_cons{}, _) ->
- #c_literal{val=false};
-eval_is_boolean(_, #c_tuple{}, _) ->
- #c_literal{val=false};
-eval_is_boolean(Call, _, _) ->
- Call.
+eval_is_boolean(Call, Term, Sub) ->
+ case is_boolean_type(Term, Sub) of
+ no -> #c_literal{val=false};
+ yes -> #c_literal{val=true};
+ maybe -> Call
+ end.
%% eval_length(Call, List) -> Val.
%% Evaluates the length for the prefix of List which has a known
@@ -1318,20 +1311,19 @@ eval_append(Call, X, Y) ->
%% Evaluates element/2 if the position Pos is a literal and
%% the shape of the tuple Tuple is known.
%%
-eval_element(Call, #c_literal{val=Pos}, #c_tuple{es=Es}, _Types) when is_integer(Pos) ->
- if
- 1 =< Pos, Pos =< length(Es) ->
- lists:nth(Pos, Es);
- true ->
- eval_failure(Call, badarg)
- end;
-eval_element(Call, #c_literal{val=Pos}, #c_var{name=V}, Types)
+eval_element(Call, #c_literal{val=Pos}, Tuple, Types)
when is_integer(Pos) ->
- case orddict:find(V, Types#sub.t) of
- {ok,#c_tuple{es=Elements}} ->
+ case get_type(Tuple, Types) of
+ none ->
+ Call;
+ Type ->
+ Es = case cerl:is_c_tuple(Type) of
+ false -> [];
+ true -> cerl:tuple_es(Type)
+ end,
if
- 1 =< Pos, Pos =< length(Elements) ->
- El = lists:nth(Pos, Elements),
+ 1 =< Pos, Pos =< length(Es) ->
+ El = lists:nth(Pos, Es),
try
pat_to_expr(El)
catch
@@ -1339,12 +1331,9 @@ eval_element(Call, #c_literal{val=Pos}, #c_var{name=V}, Types)
Call
end;
true ->
+ %% Index outside tuple or not a tuple.
eval_failure(Call, badarg)
- end;
- {ok,_} ->
- eval_failure(Call, badarg);
- error ->
- Call
+ end
end;
eval_element(Call, Pos, Tuple, _Types) ->
case is_not_integer(Pos) orelse is_not_tuple(Tuple) of
@@ -1357,14 +1346,24 @@ eval_element(Call, Pos, Tuple, _Types) ->
%% eval_is_record(Call, Var, Tag, Size, Types) -> Val.
%% Evaluates is_record/3 using type information.
%%
-eval_is_record(Call, #c_var{name=V}, #c_literal{val=NeededTag}=Lit,
+eval_is_record(Call, Term, #c_literal{val=NeededTag},
#c_literal{val=Size}, Types) ->
- case orddict:find(V, Types#sub.t) of
- {ok,#c_tuple{es=[#c_literal{val=Tag}|_]=Es}} ->
- Lit#c_literal{val=Tag =:= NeededTag andalso
- length(Es) =:= Size};
- _ ->
- Call
+ case get_type(Term, Types) of
+ none ->
+ Call;
+ Type ->
+ Es = case cerl:is_c_tuple(Type) of
+ false -> [];
+ true -> cerl:tuple_es(Type)
+ end,
+ case Es of
+ [#c_literal{val=Tag}|_] ->
+ Bool = Tag =:= NeededTag andalso
+ length(Es) =:= Size,
+ #c_literal{val=Bool};
+ _ ->
+ #c_literal{val=false}
+ end
end;
eval_is_record(Call, _, _, _, _) -> Call.
@@ -2406,11 +2405,8 @@ is_bool_expr(#c_let{vars=[V],arg=Arg,body=B}, Sub0) ->
is_bool_expr(#c_let{body=B}, Sub) ->
%% Binding of multiple variables.
is_bool_expr(B, Sub);
-is_bool_expr(#c_literal{val=Bool}, _) when is_boolean(Bool) ->
- true;
-is_bool_expr(#c_var{name=V}, Sub) ->
- is_boolean_type(V, Sub);
-is_bool_expr(_, _) -> false.
+is_bool_expr(C, Sub) ->
+ is_boolean_type(C, Sub) =:= yes.
is_bool_expr_list([C|Cs], Sub) ->
is_bool_expr(C, Sub) andalso is_bool_expr_list(Cs, Sub);
@@ -2828,12 +2824,45 @@ is_any_var_used([#c_var{name=V}|Vs], Expr) ->
end;
is_any_var_used([], _) -> false.
-is_boolean_type(V, #sub{t=Tdb}) ->
+%%%
+%%% Retrieving information about types.
+%%%
+
+-spec get_type(cerl:cerl(), #sub{}) -> type_info() | 'none'.
+
+get_type(#c_var{name=V}, #sub{t=Tdb}) ->
case orddict:find(V, Tdb) of
- {ok,bool} -> true;
- _ -> false
+ {ok,Type} -> Type;
+ error -> none
+ end;
+get_type(C, _) ->
+ case cerl:type(C) of
+ binary -> C;
+ map -> C;
+ _ ->
+ case cerl:is_data(C) of
+ true -> C;
+ false -> none
+ end
+ end.
+
+-spec is_boolean_type(cerl:cerl(), sub()) -> yes_no_maybe().
+
+is_boolean_type(Var, Sub) ->
+ case get_type(Var, Sub) of
+ none ->
+ maybe;
+ bool ->
+ yes;
+ C ->
+ B = cerl:is_c_atom(C) andalso
+ is_boolean(cerl:atom_val(C)),
+ yes_no(B)
end.
+yes_no(true) -> yes;
+yes_no(false) -> no.
+
%% update_types(Expr, Pattern, Sub) -> Sub'
%% Update the type database.
update_types(Expr, Pat, #sub{t=Tdb0}=Sub) ->
generated by cgit v1.2.3 (git 2.25.1) at 2024-12-18 20:59:05 +0000