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-rw-r--r--lib/compiler/src/sys_core_dsetel.erl36
1 files changed, 20 insertions, 16 deletions
diff --git a/lib/compiler/src/sys_core_dsetel.erl b/lib/compiler/src/sys_core_dsetel.erl
index ac32db10fe..c6cfdbae7e 100644
--- a/lib/compiler/src/sys_core_dsetel.erl
+++ b/lib/compiler/src/sys_core_dsetel.erl
@@ -72,7 +72,7 @@ module(M0, _Options) ->
{ok,M}.
visit_module(#c_module{defs=Ds0}=R) ->
- Env = dict:new(),
+ Env = #{},
Ds = visit_module_1(Ds0, Env, []),
R#c_module{defs=Ds}.
@@ -95,9 +95,11 @@ visit(Env, #c_var{name={_,_}}=R) ->
{R, Env};
visit(Env0, #c_var{name=X}=R) ->
%% There should not be any free variables. If there are,
- %% the next line will cause an exception.
- {ok, N} = dict:find(X, Env0),
- {R, dict:store(X, N+1, Env0)};
+ %% the case will fail with an exception.
+ case Env0 of
+ #{X:=N} ->
+ {R, Env0#{X:=N+1}}
+ end;
visit(Env, #c_literal{}=R) ->
{R, Env};
visit(Env0, #c_tuple{es=Es0}=R) ->
@@ -203,7 +205,7 @@ bind_vars(Vs, Env) ->
bind_vars(Vs, Env, []).
bind_vars([#c_var{name=X}|Vs], Env0, Xs)->
- bind_vars(Vs, dict:store(X, 0, Env0), [X|Xs]);
+ bind_vars(Vs, Env0#{X=>0}, [X|Xs]);
bind_vars([], Env,Xs) ->
{Xs, Env}.
@@ -217,7 +219,7 @@ visit_pats([], Env, Vs) ->
{Vs, Env}.
visit_pat(Env0, #c_var{name=V}, Vs) ->
- {[V|Vs], dict:store(V, 0, Env0)};
+ {[V|Vs], Env0#{V=>0}};
visit_pat(Env0, #c_tuple{es=Es}, Vs) ->
visit_pats(Es, Env0, Vs);
visit_pat(Env0, #c_map{es=Es}, Vs) ->
@@ -235,23 +237,25 @@ visit_pat(Env0, #c_bitstr{val=Val,size=Sz}, Vs0) ->
case Sz of
#c_var{name=V} ->
%% We don't tolerate free variables.
- {ok, N} = dict:find(V, Env0),
- {Vs0, dict:store(V, N+1, Env0)};
+ case Env0 of
+ #{V:=N} ->
+ {Vs0, Env0#{V:=N+1}}
+ end;
_ ->
visit_pat(Env0, Sz, Vs0)
end,
visit_pat(Env1, Val, Vs1);
visit_pat(Env0, #c_alias{pat=P,var=#c_var{name=V}}, Vs) ->
- visit_pat(dict:store(V, 0, Env0), P, [V|Vs]);
+ visit_pat(Env0#{V=>0}, P, [V|Vs]);
visit_pat(Env, #c_literal{}, Vs) ->
{Vs, Env}.
restore_vars([V|Vs], Env0, Env1) ->
- case dict:find(V, Env0) of
- {ok, N} ->
- restore_vars(Vs, Env0, dict:store(V, N, Env1));
- error ->
- restore_vars(Vs, Env0, dict:erase(V, Env1))
+ case Env0 of
+ #{V:=N} ->
+ restore_vars(Vs, Env0, Env1#{V=>N});
+ _ ->
+ restore_vars(Vs, Env0, maps:remove(V, Env1))
end;
restore_vars([], _, Env1) ->
Env1.
@@ -349,8 +353,8 @@ is_safe(#c_literal{}) -> true;
is_safe(_) -> false.
is_single_use(V, Env) ->
- case dict:find(V, Env) of
- {ok, 1} ->
+ case Env of
+ #{V:=1} ->
true;
_ ->
false