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-rw-r--r--lib/compiler/src/sys_core_fold.erl24
1 files changed, 13 insertions, 11 deletions
diff --git a/lib/compiler/src/sys_core_fold.erl b/lib/compiler/src/sys_core_fold.erl
index de92792a68..9c8e2b89c9 100644
--- a/lib/compiler/src/sys_core_fold.erl
+++ b/lib/compiler/src/sys_core_fold.erl
@@ -1482,7 +1482,7 @@ clause(#c_clause{pats=Ps0,guard=G0,body=B0}=Cl, Cexpr, Ctxt, Sub0) ->
let_substs(Vs0, As0, Sub0) ->
{Vs1,Sub1} = pattern_list(Vs0, Sub0),
{Vs2,As1,Ss} = let_substs_1(Vs1, As0, Sub1),
- Sub2 = scope_add([V || #c_var{name=V} <- Vs2], Sub1),
+ Sub2 = sub_add_scope([V || #c_var{name=V} <- Vs2], Sub1),
{Vs2,As1,
foldl(fun ({V,S}, Sub) -> sub_set_name(V, S, Sub) end, Sub2, Ss)}.
@@ -1517,7 +1517,7 @@ pattern(#c_var{}=Pat, Isub, Osub) ->
true ->
V1 = make_var_name(),
Pat1 = #c_var{name=V1},
- {Pat1,sub_set_var(Pat, Pat1, scope_add([V1], Osub))};
+ {Pat1,sub_set_var(Pat, Pat1, sub_add_scope([V1], Osub))};
false ->
{Pat,sub_del_var(Pat, Osub)}
end;
@@ -1587,6 +1587,7 @@ is_subst(_) -> false.
%% sub_del_var(Var, #sub{}) -> #sub{}.
%% sub_subst_var(Var, Value, #sub{}) -> [{Name,Value}].
%% sub_is_val(Var, #sub{}) -> boolean().
+%% sub_add_scope(#sub{}) -> #sub{}
%% sub_subst_scope(#sub{}) -> #sub{}
%%
%% We use the variable name as key so as not have problems with
@@ -1597,9 +1598,10 @@ is_subst(_) -> false.
%% In addition to the list of substitutions, we also keep track of
%% all variable currently live (the scope).
%%
-%% sub_subst_scope/1 adds dummy substitutions for all variables
-%% in the scope in order to force renaming if variables in the
-%% scope occurs as pattern variables.
+%% sub_add_scope/2 adds variables to the scope. sub_subst_scope/1
+%% adds dummy substitutions for all variables in the scope in order
+%% to force renaming if variables in the scope occurs as pattern
+%% variables.
sub_new() -> #sub{v=orddict:new(),s=gb_trees:empty(),t=[]}.
@@ -1639,6 +1641,12 @@ sub_subst_var(#c_var{name=V}, Val, #sub{v=S0}) ->
%% Fold chained substitutions.
[{V,Val}] ++ [ {K,Val} || {K,#c_var{name=V1}} <- S0, V1 =:= V].
+sub_add_scope(Vs, #sub{s=Scope0}=Sub) ->
+ Scope = foldl(fun(V, S) when is_integer(V); is_atom(V) ->
+ gb_sets:add(V, S)
+ end, Scope0, Vs),
+ Sub#sub{s=Scope}.
+
sub_subst_scope(#sub{v=S0,s=Scope}=Sub) ->
S = [{-1,#c_var{name=Sv}} || Sv <- gb_sets:to_list(Scope)]++S0,
Sub#sub{v=S}.
@@ -2612,12 +2620,6 @@ move_let_into_expr(_Let, _Expr, _Sub) -> impossible.
is_failing_clause(#c_clause{body=B}) ->
will_fail(B).
-scope_add(Vs, #sub{s=Scope0}=Sub) ->
- Scope = foldl(fun(V, S) when is_integer(V); is_atom(V) ->
- gb_sets:add(V, S)
- end, Scope0, Vs),
- Sub#sub{s=Scope}.
-
%% opt_simple_let(#c_let{}, Context, Sub) -> CoreTerm
%% Optimize a let construct that does not contain any lets in
%% in its argument.