--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/test/hotspot/gtest/memory/test_is_metaspace_obj.cpp	Wed Mar 27 14:13:34 2019 +0100
@@ -0,0 +1,115 @@
+/*
+ * Copyright (c) 2016, 2018 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.
+ */
+
+#include "precompiled.hpp"
+#include "memory/allocation.inline.hpp"
+#include "memory/metaspace.hpp"
+#include "memory/metaspace/virtualSpaceList.hpp"
+#include "runtime/mutex.hpp"
+#include "runtime/mutexLocker.hpp"
+#include "runtime/os.hpp"
+#include "unittest.hpp"
+
+using namespace metaspace;
+
+
+// Test the cheerful multitude of metaspace-contains-functions.
+class MetaspaceIsMetaspaceObjTest : public ::testing::Test {
+  Mutex* _lock;
+  ClassLoaderMetaspace* _ms;
+
+public:
+
+  MetaspaceIsMetaspaceObjTest() : _lock(NULL), _ms(NULL) {}
+
+  virtual void SetUp() {
+  }
+
+  virtual void TearDown() {
+    delete _ms;
+    delete _lock;
+  }
+
+  void do_test(Metaspace::MetadataType mdType) {
+    _lock = new Mutex(Monitor::native, "gtest-IsMetaspaceObjTest-lock", false, Monitor::_safepoint_check_never);
+    {
+      MutexLockerEx ml(_lock, Mutex::_no_safepoint_check_flag);
+      _ms = new ClassLoaderMetaspace(_lock, Metaspace::StandardMetaspaceType);
+    }
+
+    const MetaspaceObj* p = (MetaspaceObj*) _ms->allocate(42, mdType);
+
+    // Test MetaspaceObj::is_metaspace_object
+    ASSERT_TRUE(MetaspaceObj::is_valid(p));
+
+    // A misaligned object shall not be recognized
+    const MetaspaceObj* p_misaligned = (MetaspaceObj*)((address)p) + 1;
+    ASSERT_FALSE(MetaspaceObj::is_valid(p_misaligned));
+
+    // Test VirtualSpaceList::contains and find_enclosing_space
+    VirtualSpaceList* list = Metaspace::space_list();
+    if (mdType == Metaspace::ClassType && Metaspace::using_class_space()) {
+      list = Metaspace::class_space_list();
+    }
+    ASSERT_TRUE(list->contains(p));
+    VirtualSpaceNode* const n = list->find_enclosing_space(p);
+    ASSERT_TRUE(n != NULL);
+    ASSERT_TRUE(n->contains(p));
+
+    // A misaligned pointer shall be recognized by list::contains
+    ASSERT_TRUE(list->contains((address)p) + 1);
+
+    // Now for some bogus values
+    ASSERT_FALSE(MetaspaceObj::is_valid((MetaspaceObj*)NULL));
+
+    // Should exercise various paths in MetaspaceObj::is_valid()
+    ASSERT_FALSE(MetaspaceObj::is_valid((MetaspaceObj*)1024));
+    ASSERT_FALSE(MetaspaceObj::is_valid((MetaspaceObj*)8192));
+
+    MetaspaceObj* p_stack = (MetaspaceObj*) &_lock;
+    ASSERT_FALSE(MetaspaceObj::is_valid(p_stack));
+
+    MetaspaceObj* p_heap = (MetaspaceObj*) os::malloc(41, mtInternal);
+    ASSERT_FALSE(MetaspaceObj::is_valid(p_heap));
+    os::free(p_heap);
+
+    // Test Metaspace::contains_xxx
+    ASSERT_TRUE(Metaspace::contains(p));
+    ASSERT_TRUE(Metaspace::contains_non_shared(p));
+
+    delete _ms;
+    _ms = NULL;
+    delete _lock;
+    _lock = NULL;
+  }
+
+};
+
+TEST_VM_F(MetaspaceIsMetaspaceObjTest, non_class_space) {
+  do_test(Metaspace::NonClassType);
+}
+
+TEST_VM_F(MetaspaceIsMetaspaceObjTest, class_space) {
+  do_test(Metaspace::ClassType);
+}
+