File 2195-Convert-dict-to-map-in-rec_env.erl.patch of Package erlang
From e63fe144075aec35774a58904332624dc5e3d9dd Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Jos=C3=A9=20Valim?= <jose.valim@plataformatec.com.br>
Date: Wed, 1 Jun 2016 21:15:12 +0200
Subject: [PATCH] Convert dict() to map() in rec_env.erl
---
lib/compiler/src/rec_env.erl | 174 ++++++++++++++++++++-----------------------
1 file changed, 82 insertions(+), 92 deletions(-)
diff --git a/lib/compiler/src/rec_env.erl b/lib/compiler/src/rec_env.erl
index 936c5f6..cdc513e 100644
--- a/lib/compiler/src/rec_env.erl
+++ b/lib/compiler/src/rec_env.erl
@@ -22,8 +22,7 @@
%% @doc Abstract environments, supporting self-referential bindings and
%% automatic new-key generation.
-%% The current implementation is based on Erlang standard library
-%% dictionaries.
+%% The current implementation is based on Erlang standard library maps.
%%% -define(DEBUG, true).
@@ -62,7 +61,7 @@ test_0(Type, N) ->
io:fwrite("\ncalls: ~w.\n", [get(new_key_calls)]),
io:fwrite("\nretries: ~w.\n", [get(new_key_retries)]),
io:fwrite("\nmax: ~w.\n", [get(new_key_max)]),
- dict:to_list(element(1,Env)).
+ maps:to_list(element(1,Env)).
test_1(integer = Type, N, Env) when is_integer(N), N > 0 ->
Key = new_key(Env),
@@ -80,14 +79,13 @@ test_1(_,0, Env) ->
%%
%% environment() = [Mapping]
%%
-%% Mapping = {map, Dict} | {rec, Dict, Dict}
-%% Dict = dict:dictionary()
+%% Mapping = {map, map()} | {rec, map(), map()}
%%
-%% An empty environment is a list containing a single `{map, Dict}'
+%% An empty environment is a list containing a single `{map, map()}'
%% element - empty lists are not valid environments. To find a key in an
%% environment, it is searched for in each mapping in the list, in
%% order, until it the key is found in some mapping, or the end of the
-%% list is reached. In a 'rec' mapping, we keep the original dictionary
+%% list is reached. In a 'rec' mapping, we keep the original map
%% together with a version where entries may have been deleted - this
%% makes it possible to garbage collect the entire 'rec' mapping when
%% all its entries are unused (for example, by being shadowed by later
@@ -97,7 +95,7 @@ test_1(_,0, Env) ->
%% =====================================================================
%% @type environment(). An abstract environment.
--type mapping() :: {'map', dict:dict()} | {'rec', dict:dict(), dict:dict()}.
+-type mapping() :: {'map', map()} | {'rec', map(), map()}.
-type environment() :: [mapping(),...].
%% =====================================================================
@@ -108,7 +106,7 @@ test_1(_,0, Env) ->
-spec empty() -> environment().
empty() ->
- [{map, dict:new()}].
+ [{map, #{}}].
%% =====================================================================
@@ -119,14 +117,14 @@ empty() ->
-spec is_empty(environment()) -> boolean().
-is_empty([{map, Dict} | Es]) ->
- N = dict:size(Dict),
+is_empty([{map, Map} | Es]) ->
+ N = map_size(Map),
if N =/= 0 -> false;
Es =:= [] -> true;
true -> is_empty(Es)
end;
-is_empty([{rec, Dict, _} | Es]) ->
- N = dict:size(Dict),
+is_empty([{rec, Map, _} | Es]) ->
+ N = map_size(Map),
if N =/= 0 -> false;
Es =:= [] -> true;
true -> is_empty(Es)
@@ -146,12 +144,12 @@ is_empty([{rec, Dict, _} | Es]) ->
size(Env) ->
env_size(Env).
-env_size([{map, Dict}]) ->
- dict:size(Dict);
-env_size([{map, Dict} | Env]) ->
- dict:size(Dict) + env_size(Env);
-env_size([{rec, Dict, _Dict0} | Env]) ->
- dict:size(Dict) + env_size(Env).
+env_size([{map, Map}]) ->
+ map_size(Map);
+env_size([{map, Map} | Env]) ->
+ map_size(Map) + env_size(Env);
+env_size([{rec, Map, _Map0} | Env]) ->
+ map_size(Map) + env_size(Env).
%% =====================================================================
@@ -165,8 +163,8 @@ env_size([{rec, Dict, _Dict0} | Env]) ->
-spec is_defined(term(), environment()) -> boolean().
-is_defined(Key, [{map, Dict} | Env]) ->
- case dict:is_key(Key, Dict) of
+is_defined(Key, [{map, Map} | Env]) ->
+ case maps:is_key(Key, Map) of
true ->
true;
false when Env =:= [] ->
@@ -174,8 +172,8 @@ is_defined(Key, [{map, Dict} | Env]) ->
false ->
is_defined(Key, Env)
end;
-is_defined(Key, [{rec, Dict, _Dict0} | Env]) ->
- dict:is_key(Key, Dict) orelse is_defined(Key, Env).
+is_defined(Key, [{rec, Map, _Map0} | Env]) ->
+ maps:is_key(Key, Map) orelse is_defined(Key, Env).
%% =====================================================================
@@ -188,12 +186,12 @@ is_defined(Key, [{rec, Dict, _Dict0} | Env]) ->
keys(Env) ->
lists:sort(keys(Env, [])).
-keys([{map, Dict}], S) ->
- dict:fetch_keys(Dict) ++ S;
-keys([{map, Dict} | Env], S) ->
- keys(Env, dict:fetch_keys(Dict) ++ S);
-keys([{rec, Dict, _Dict0} | Env], S) ->
- keys(Env, dict:fetch_keys(Dict) ++ S).
+keys([{map, Map}], S) ->
+ maps:keys(Map) ++ S;
+keys([{map, Map} | Env], S) ->
+ keys(Env, maps:keys(Map) ++ S);
+keys([{rec, Map, _Map0} | Env], S) ->
+ keys(Env, maps:keys(Map) ++ S).
%% =====================================================================
@@ -212,12 +210,12 @@ keys([{rec, Dict, _Dict0} | Env], S) ->
to_list(Env) ->
lists:sort(to_list(Env, [])).
-to_list([{map, Dict}], S) ->
- dict:to_list(Dict) ++ S;
-to_list([{map, Dict} | Env], S) ->
- to_list(Env, dict:to_list(Dict) ++ S);
-to_list([{rec, Dict, _Dict0} | Env], S) ->
- to_list(Env, dict:to_list(Dict) ++ S).
+to_list([{map, Map}], S) ->
+ maps:to_list(Map) ++ S;
+to_list([{map, Map} | Env], S) ->
+ to_list(Env, maps:to_list(Map) ++ S);
+to_list([{rec, Map, _Map0} | Env], S) ->
+ to_list(Env, maps:to_list(Map) ++ S).
%% =====================================================================
@@ -236,12 +234,12 @@ to_list([{rec, Dict, _Dict0} | Env], S) ->
-spec bind(term(), term(), environment()) -> environment().
-bind(Key, Value, [{map, Dict}]) ->
- [{map, dict:store(Key, Value, Dict)}];
-bind(Key, Value, [{map, Dict} | Env]) ->
- [{map, dict:store(Key, Value, Dict)} | delete_any(Key, Env)];
+bind(Key, Value, [{map, Map}]) ->
+ [{map, maps:put(Key, Value, Map)}];
+bind(Key, Value, [{map, Map} | Env]) ->
+ [{map, maps:put(Key, Value, Map)} | delete_any(Key, Env)];
bind(Key, Value, Env) ->
- [{map, dict:store(Key, Value, dict:new())} | delete_any(Key, Env)].
+ [{map, maps:put(Key, Value, #{})} | delete_any(Key, Env)].
%% =====================================================================
@@ -259,17 +257,17 @@ bind(Key, Value, Env) ->
-spec bind_list([term()], [term()], environment()) -> environment().
-bind_list(Ks, Vs, [{map, Dict}]) ->
- [{map, store_list(Ks, Vs, Dict)}];
-bind_list(Ks, Vs, [{map, Dict} | Env]) ->
- [{map, store_list(Ks, Vs, Dict)} | delete_list(Ks, Env)];
+bind_list(Ks, Vs, [{map, Map}]) ->
+ [{map, store_list(Ks, Vs, Map)}];
+bind_list(Ks, Vs, [{map, Map} | Env]) ->
+ [{map, store_list(Ks, Vs, Map)} | delete_list(Ks, Env)];
bind_list(Ks, Vs, Env) ->
- [{map, store_list(Ks, Vs, dict:new())} | delete_list(Ks, Env)].
+ [{map, store_list(Ks, Vs, #{})} | delete_list(Ks, Env)].
-store_list([K | Ks], [V | Vs], Dict) ->
- store_list(Ks, Vs, dict:store(K, V, Dict));
-store_list([], _, Dict) ->
- Dict.
+store_list([K | Ks], [V | Vs], Map) ->
+ store_list(Ks, Vs, maps:put(K, V, Map));
+store_list([], _, Map) ->
+ Map.
delete_list([K | Ks], Env) ->
delete_list(Ks, delete_any(K, Env));
@@ -298,48 +296,40 @@ delete_any(Key, Env) ->
-spec delete(term(), environment()) -> environment().
-delete(Key, [{map, Dict} = E | Env]) ->
- case dict:is_key(Key, Dict) of
- true ->
- [{map, dict:erase(Key, Dict)} | Env];
- false ->
+delete(Key, [{map, Map} = E | Env]) ->
+ case maps:take(Key, Map) of
+ {_, Map1} ->
+ [{map, Map1} | Env];
+ error ->
delete_1(Key, Env, E)
end;
-delete(Key, [{rec, Dict, Dict0} = E | Env]) ->
- case dict:is_key(Key, Dict) of
- true ->
- %% The Dict0 component must be preserved as it is until all
- %% keys in Dict have been deleted.
- Dict1 = dict:erase(Key, Dict),
- case dict:size(Dict1) of
- 0 ->
- Env; % the whole {rec,...} is now garbage
- _ ->
- [{rec, Dict1, Dict0} | Env]
- end;
- false ->
+delete(Key, [{rec, Map, Map0} = E | Env]) ->
+ case maps:take(Key, Map) of
+ {_, Map1} when map_size(Map1) =:= 0 ->
+ Env; % the whole {rec,...} is now garbage
+ %% The Map0 component must be preserved as it is until all
+ %% keys in Map have been deleted.
+ {_, Map1} ->
+ [{rec, Map1, Map0} | Env];
+ error ->
[E | delete(Key, Env)]
end.
%% This is just like above, except we pass on the preceding 'map'
%% mapping in the list to enable merging when removing 'rec' mappings.
-delete_1(Key, [{rec, Dict, Dict0} = E | Env], E1) ->
- case dict:is_key(Key, Dict) of
- true ->
- Dict1 = dict:erase(Key, Dict),
- case dict:size(Dict1) of
- 0 ->
- concat(E1, Env);
- _ ->
- [E1, {rec, Dict1, Dict0} | Env]
- end;
- false ->
+delete_1(Key, [{rec, Map, Map0} = E | Env], E1) ->
+ case maps:take(Key, Map) of
+ {_, Map1} when map_size(Map1) =:= 0 ->
+ concat(E1, Env);
+ {_, Map1} ->
+ [E1, {rec, Map1, Map0} | Env];
+ error ->
[E1, E | delete(Key, Env)]
end.
-concat({map, D1}, [{map, D2} | Env]) ->
- [dict:merge(fun (_K, V1, _V2) -> V1 end, D1, D2) | Env];
+concat({map, M1}, [{map, M2} | Env]) ->
+ [maps:merge(M2, M1) | Env];
concat(E1, Env) ->
[E1 | Env].
@@ -392,15 +382,15 @@ bind_recursive([], [], _, Env) ->
Env;
bind_recursive(Ks, Vs, F, Env) ->
F1 = fun (V) ->
- fun (Dict) -> F(V, [{rec, Dict, Dict} | Env]) end
+ fun (Map) -> F(V, [{rec, Map, Map} | Env]) end
end,
- Dict = bind_recursive_1(Ks, Vs, F1, dict:new()),
- [{rec, Dict, Dict} | Env].
+ Map = bind_recursive_1(Ks, Vs, F1, #{}),
+ [{rec, Map, Map} | Env].
-bind_recursive_1([K | Ks], [V | Vs], F, Dict) ->
- bind_recursive_1(Ks, Vs, F, dict:store(K, F(V), Dict));
-bind_recursive_1([], [], _, Dict) ->
- Dict.
+bind_recursive_1([K | Ks], [V | Vs], F, Map) ->
+ bind_recursive_1(Ks, Vs, F, maps:put(K, F(V), Map));
+bind_recursive_1([], [], _, Map) ->
+ Map.
%% =====================================================================
@@ -416,8 +406,8 @@ bind_recursive_1([], [], _, Dict) ->
-spec lookup(term(), environment()) -> 'error' | {'ok', term()}.
-lookup(Key, [{map, Dict} | Env]) ->
- case dict:find(Key, Dict) of
+lookup(Key, [{map, Map} | Env]) ->
+ case maps:find(Key, Map) of
{ok, _}=Value ->
Value;
error when Env =:= [] ->
@@ -425,10 +415,10 @@ lookup(Key, [{map, Dict} | Env]) ->
error ->
lookup(Key, Env)
end;
-lookup(Key, [{rec, Dict, Dict0} | Env]) ->
- case dict:find(Key, Dict) of
+lookup(Key, [{rec, Map, Map0} | Env]) ->
+ case maps:find(Key, Map) of
{ok, F} ->
- {ok, F(Dict0)};
+ {ok, F(Map0)};
error ->
lookup(Key, Env)
end.
--
2.1.4
