--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/src/hotspot/share/gc/shenandoah/shenandoahBarrierSetNMethod.cpp Wed Nov 27 11:52:57 2019 -0500
@@ -0,0 +1,76 @@
+/*
+ * Copyright (c) 2019, Red Hat, Inc. All rights reserved.
+ *
+ * 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.
+ *
+ */
+
+#include "precompiled.hpp"
+
+#include "gc/shenandoah/shenandoahBarrierSetNMethod.hpp"
+#include "gc/shenandoah/shenandoahClosures.inline.hpp"
+#include "gc/shenandoah/shenandoahCodeRoots.hpp"
+#include "gc/shenandoah/shenandoahHeap.inline.hpp"
+#include "gc/shenandoah/shenandoahLock.hpp"
+#include "gc/shenandoah/shenandoahNMethod.inline.hpp"
+#include "gc/shenandoah/shenandoahThreadLocalData.hpp"
+#include "memory/iterator.hpp"
+#include "memory/resourceArea.hpp"
+
+bool ShenandoahBarrierSetNMethod::nmethod_entry_barrier(nmethod* nm) {
+ ShenandoahReentrantLock* lock = ShenandoahNMethod::lock_for_nmethod(nm);
+ assert(lock != NULL, "Must be");
+ ShenandoahReentrantLocker locker(lock);
+
+ if (!is_armed(nm)) {
+ // Some other thread got here first and healed the oops
+ // and disarmed the nmethod.
+ return true;
+ }
+
+ if (nm->is_unloading()) {
+ // We don't need to take the lock when unlinking nmethods from
+ // the Method, because it is only concurrently unlinked by
+ // the entry barrier, which acquires the per nmethod lock.
+ nm->unlink_from_method();
+
+ // We can end up calling nmethods that are unloading
+ // since we clear compiled ICs lazily. Returning false
+ // will re-resovle the call and update the compiled IC.
+ return false;
+ }
+
+ // Heal oops and disarm
+ ShenandoahEvacOOMScope scope;
+ ShenandoahNMethod::heal_nmethod(nm);
+ ShenandoahNMethod::disarm_nmethod(nm);
+ return true;
+}
+
+int ShenandoahBarrierSetNMethod::disarmed_value() const {
+ return ShenandoahCodeRoots::disarmed_value();
+}
+
+ByteSize ShenandoahBarrierSetNMethod::thread_disarmed_offset() const {
+ return ShenandoahThreadLocalData::disarmed_value_offset();
+}
+
+int* ShenandoahBarrierSetNMethod::disarmed_value_address() const {
+ return ShenandoahCodeRoots::disarmed_value_address();
+}