From 657760e18087b0cdbaecc5e96e46f6f66bc9497a Mon Sep 17 00:00:00 2001
From: Hans Bolinder <hasse@erlang.org>
Date: Thu, 15 Dec 2016 09:47:02 +0100
Subject: compiler: Do not spawn process when dialyzing

Memory consumption is reduced during the compilation phase by keeping
the Core parse tree shared. In particular the file annotation takes a
lot of memory when not shared.
---
 lib/compiler/src/compile.erl | 30 +++++++++++++++++++-----------
 1 file changed, 19 insertions(+), 11 deletions(-)

(limited to 'lib')

diff --git a/lib/compiler/src/compile.erl b/lib/compiler/src/compile.erl
index 434360d294..e37ca31704 100644
--- a/lib/compiler/src/compile.erl
+++ b/lib/compiler/src/compile.erl
@@ -173,17 +173,25 @@ env_default_opts() ->
 
 do_compile(Input, Opts0) ->
     Opts = expand_opts(Opts0),
-    {Pid,Ref} =
-	spawn_monitor(fun() ->
-			      exit(try
-				       internal(Input, Opts)
-				   catch
-				       error:Reason ->
-					   {error,Reason}
-				   end)
-		      end),
-    receive
-	{'DOWN',Ref,process,Pid,Rep} -> Rep
+    IntFun = fun() -> try
+                          internal(Input, Opts)
+                      catch
+                          error:Reason ->
+                              {error,Reason}
+                      end
+             end,
+    %% Dialyzer has already spawned workers.
+    case lists:member(dialyzer, Opts) of
+        true ->
+            IntFun();
+        false ->
+            {Pid,Ref} =
+                spawn_monitor(fun() ->
+                                      exit(IntFun())
+                              end),
+            receive
+                {'DOWN',Ref,process,Pid,Rep} -> Rep
+            end
     end.
 
 expand_opts(Opts0) ->
-- 
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