--- a/nashorn/make/build.xml	Thu Dec 17 13:40:15 2015 +0530
+++ b/nashorn/make/build.xml	Thu Dec 17 18:11:09 2015 +0530
@@ -414,6 +414,13 @@
     permission java.util.PropertyPermission "nashorn.test.*", "read";
 };
 
+grant codeBase "file:/${basedir}/test/script/basic/apply_to_call/*" {
+    permission java.io.FilePermission "${basedir}/test/script/-", "read";
+    permission java.io.FilePermission "$${user.dir}", "read";
+    permission java.util.PropertyPermission "user.dir", "read";
+    permission java.util.PropertyPermission "nashorn.test.*", "read";
+};
+
 grant codeBase "file:/${basedir}/test/script/basic/parser/*" {
     permission java.io.FilePermission "${basedir}/test/script/-", "read";
     permission java.io.FilePermission "$${user.dir}", "read";

--- a/nashorn/src/jdk.scripting.nashorn/share/classes/jdk/nashorn/internal/runtime/ScriptFunction.java	Thu Dec 17 13:40:15 2015 +0530
+++ b/nashorn/src/jdk.scripting.nashorn/share/classes/jdk/nashorn/internal/runtime/ScriptFunction.java	Thu Dec 17 18:11:09 2015 +0530
@@ -972,6 +972,13 @@
             }
         }
 
+        // Is this an unstable callsite which was earlier apply-to-call optimized?
+        // If so, earlier apply2call would have exploded arguments. We have to convert
+        // that as an array again!
+        if (isUnstable && NashornCallSiteDescriptor.isApplyToCall(desc)) {
+            boundHandle = MH.asCollector(boundHandle, Object[].class, type.parameterCount() - 2);
+        }
+
         boundHandle = pairArguments(boundHandle, type);
 
         if (bestInvoker.getSwitchPoints() != null) {

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/nashorn/test/script/basic/apply_to_call/JDK-8145669.js	Thu Dec 17 18:11:09 2015 +0530
@@ -0,0 +1,32 @@
+/* 
+ * Copyright (c) 2015, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+
+/* 
+ * JDK-8145669: apply2call optimized callsite fails after becoming megamorphic
+ *
+ * @test
+ * @option --unstable-relink-threshold=1
+ * @run
+ */
+
+load(__DIR__ + "apply_to_call2.js");

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/nashorn/test/script/basic/apply_to_call/JDK-8145669.js.EXPECTED	Thu Dec 17 18:11:09 2015 +0530
@@ -0,0 +1,8 @@
+start
+4711
+23
+17
+Overwriting call now
+1
+2
+3

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/nashorn/test/script/basic/apply_to_call/JDK-8145669_2.js	Thu Dec 17 18:11:09 2015 +0530
@@ -0,0 +1,32 @@
+/*
+ * Copyright (c) 2015, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+
+/**
+ * JDK-8145669: apply2call optimized callsite fails after becoming megamorphic
+ *
+ * @test
+ * @option --unstable-relink-threshold=1
+ * @run
+ */
+
+load(__DIR__ + "apply_to_call_varargs.js");

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/nashorn/test/script/basic/apply_to_call/JDK-8145669_2.js.EXPECTED	Thu Dec 17 18:11:09 2015 +0530
@@ -0,0 +1,66 @@
+[red=0, green=255, blue=255]
+undefined
+[red=1, green=255, blue=255]
+undefined
+[red=2, green=255, blue=255]
+undefined
+[red=3, green=255, blue=255]
+undefined
+[red=4, green=255, blue=255]
+undefined
+[red=5, green=255, blue=255]
+undefined
+[red=6, green=255, blue=255]
+undefined
+[red=7, green=255, blue=255]
+undefined
+[red=8, green=255, blue=255]
+undefined
+[red=9, green=255, blue=255]
+undefined
+[red=10, green=255, blue=255]
+undefined
+[red=11, green=255, blue=255]
+undefined
+[red=12, green=255, blue=255]
+undefined
+[red=13, green=255, blue=255]
+undefined
+[red=14, green=255, blue=255]
+undefined
+[red=15, green=255, blue=255]
+undefined
+Swapping out call
+[red=0, green=255, blue=255]
+undefined
+[red=1, green=255, blue=255]
+undefined
+[red=2, green=255, blue=255]
+undefined
+[red=3, green=255, blue=255]
+undefined
+[red=4, green=255, blue=255]
+undefined
+[red=5, green=255, blue=255]
+undefined
+[red=6, green=255, blue=255]
+undefined
+[red=7, green=255, blue=255]
+undefined
+[red=8, green=255, blue=255]
+undefined
+[red=9, green=255, blue=255]
+undefined
+[red=10, green=255, blue=255]
+undefined
+[red=11, green=255, blue=255]
+undefined
+[red=12, green=255, blue=255]
+undefined
+[red=13, green=255, blue=255]
+undefined
+[red=14, green=255, blue=255]
+undefined
+[red=15, green=255, blue=255]
+undefined
+All done!