From 416711a87dcc937d78990ada5da0b8df98a8e1ee Mon Sep 17 00:00:00 2001
From: Hans Bolinder <hasse@erlang.org>
Date: Fri, 20 Jan 2017 15:28:33 +0100
Subject: dialyzer: Write PLT in subprocess

At common case, which will otherwise leave a big heap.
---
 lib/dialyzer/src/dialyzer_cl.erl | 22 ++++++++++++++++++++--
 1 file changed, 20 insertions(+), 2 deletions(-)

(limited to 'lib/dialyzer/src')

diff --git a/lib/dialyzer/src/dialyzer_cl.erl b/lib/dialyzer/src/dialyzer_cl.erl
index 93200f53d2..8500c59ebe 100644
--- a/lib/dialyzer/src/dialyzer_cl.erl
+++ b/lib/dialyzer/src/dialyzer_cl.erl
@@ -710,8 +710,16 @@ return_value(State = #cl_state{code_server = CodeServer,
     true ->
       dialyzer_plt:delete(MiniPlt);
     false ->
-      Plt = dialyzer_plt:restore_full_plt(MiniPlt),
-      dialyzer_plt:to_file(OutputPlt, Plt, ModDeps, PltInfo)
+      Fun = to_file_fun(OutputPlt, MiniPlt, ModDeps, PltInfo),
+      {Pid, Ref} = erlang:spawn_monitor(Fun),
+      dialyzer_plt:give_away(MiniPlt, Pid),
+      Pid ! go,
+      receive {'DOWN', Ref, process, Pid, Result} ->
+          case Result of
+            ok -> ok;
+            Thrown -> throw(Thrown)
+          end
+      end
   end,
   UnknownWarnings = unknown_warnings(State),
   RetValue =
@@ -732,6 +740,16 @@ return_value(State = #cl_state{code_server = CodeServer,
       {RetValue, set_warning_id(AllWarnings)}
   end.
 
+-spec to_file_fun(_, _, _, _) -> fun(() -> no_return()).
+
+to_file_fun(Filename, MiniPlt, ModDeps, PltInfo) ->
+  fun() ->
+      receive go -> ok end,
+      Plt = dialyzer_plt:restore_full_plt(MiniPlt),
+      dialyzer_plt:to_file(Filename, Plt, ModDeps, PltInfo),
+      exit(ok)
+  end.
+
 unknown_warnings(State = #cl_state{legal_warnings = LegalWarnings}) ->
   Unknown = case ordsets:is_element(?WARN_UNKNOWN, LegalWarnings) of
               true ->
-- 
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