--- a/hotspot/src/share/vm/gc/g1/g1CodeCacheRemSet.cpp	Mon Aug 22 16:43:56 2016 +0300
+++ b/hotspot/src/share/vm/gc/g1/g1CodeCacheRemSet.cpp	Mon Aug 29 20:15:12 2016 +0300
@@ -25,6 +25,7 @@
 #include "precompiled.hpp"
 #include "code/codeCache.hpp"
 #include "code/nmethod.hpp"
+#include "gc/g1/g1CodeRootSetTable.hpp"
 #include "gc/g1/g1CodeCacheRemSet.hpp"
 #include "gc/g1/heapRegion.hpp"
 #include "memory/heap.hpp"
@@ -33,58 +34,13 @@
 #include "utilities/hashtable.inline.hpp"
 #include "utilities/stack.inline.hpp"
 
-class CodeRootSetTable : public Hashtable<nmethod*, mtGC> {
-  friend class G1CodeRootSetTest;
-  typedef HashtableEntry<nmethod*, mtGC> Entry;
-
-  static CodeRootSetTable* volatile _purge_list;
-
-  CodeRootSetTable* _purge_next;
-
-  unsigned int compute_hash(nmethod* nm) {
-    uintptr_t hash = (uintptr_t)nm;
-    return hash ^ (hash >> 7); // code heap blocks are 128byte aligned
-  }
-
-  void remove_entry(Entry* e, Entry* previous);
-  Entry* new_entry(nmethod* nm);
-
- public:
-  CodeRootSetTable(int size) : Hashtable<nmethod*, mtGC>(size, sizeof(Entry)), _purge_next(NULL) {}
-  ~CodeRootSetTable();
-
-  // Needs to be protected locks
-  bool add(nmethod* nm);
-  bool remove(nmethod* nm);
+G1CodeRootSetTable* volatile G1CodeRootSetTable::_purge_list = NULL;
 
-  // Can be called without locking
-  bool contains(nmethod* nm);
-
-  int entry_size() const { return BasicHashtable<mtGC>::entry_size(); }
-
-  void copy_to(CodeRootSetTable* new_table);
-  void nmethods_do(CodeBlobClosure* blk);
-
-  template<typename CB>
-  int remove_if(CB& should_remove);
-
-  static void purge_list_append(CodeRootSetTable* tbl);
-  static void purge();
-
-  static size_t static_mem_size() {
-    return sizeof(_purge_list);
-  }
-
-  size_t mem_size();
-};
-
-CodeRootSetTable* volatile CodeRootSetTable::_purge_list = NULL;
-
-size_t CodeRootSetTable::mem_size() {
-  return sizeof(CodeRootSetTable) + (entry_size() * number_of_entries()) + (sizeof(HashtableBucket<mtGC>) * table_size());
+size_t G1CodeRootSetTable::mem_size() {
+  return sizeof(G1CodeRootSetTable) + (entry_size() * number_of_entries()) + (sizeof(HashtableBucket<mtGC>) * table_size());
 }
 
-CodeRootSetTable::Entry* CodeRootSetTable::new_entry(nmethod* nm) {
+G1CodeRootSetTable::Entry* G1CodeRootSetTable::new_entry(nmethod* nm) {
   unsigned int hash = compute_hash(nm);
   Entry* entry = (Entry*) new_entry_free_list();
   if (entry == NULL) {
@@ -96,7 +52,7 @@
   return entry;
 }
 
-void CodeRootSetTable::remove_entry(Entry* e, Entry* previous) {
+void G1CodeRootSetTable::remove_entry(Entry* e, Entry* previous) {
   int index = hash_to_index(e->hash());
   assert((e == bucket(index)) == (previous == NULL), "if e is the first entry then previous should be null");
 
@@ -108,7 +64,7 @@
   free_entry(e);
 }
 
-CodeRootSetTable::~CodeRootSetTable() {
+G1CodeRootSetTable::~G1CodeRootSetTable() {
   for (int index = 0; index < table_size(); ++index) {
     for (Entry* e = bucket(index); e != NULL; ) {
       Entry* to_remove = e;
@@ -125,7 +81,7 @@
   }
 }
 
-bool CodeRootSetTable::add(nmethod* nm) {
+bool G1CodeRootSetTable::add(nmethod* nm) {
   if (!contains(nm)) {
     Entry* e = new_entry(nm);
     int index = hash_to_index(e->hash());
@@ -135,7 +91,7 @@
   return false;
 }
 
-bool CodeRootSetTable::contains(nmethod* nm) {
+bool G1CodeRootSetTable::contains(nmethod* nm) {
   int index = hash_to_index(compute_hash(nm));
   for (Entry* e = bucket(index); e != NULL; e = e->next()) {
     if (e->literal() == nm) {
@@ -145,7 +101,7 @@
   return false;
 }
 
-bool CodeRootSetTable::remove(nmethod* nm) {
+bool G1CodeRootSetTable::remove(nmethod* nm) {
   int index = hash_to_index(compute_hash(nm));
   Entry* previous = NULL;
   for (Entry* e = bucket(index); e != NULL; previous = e, e = e->next()) {
@@ -157,7 +113,7 @@
   return false;
 }
 
-void CodeRootSetTable::copy_to(CodeRootSetTable* new_table) {
+void G1CodeRootSetTable::copy_to(G1CodeRootSetTable* new_table) {
   for (int index = 0; index < table_size(); ++index) {
     for (Entry* e = bucket(index); e != NULL; e = e->next()) {
       new_table->add(e->literal());
@@ -166,7 +122,7 @@
   new_table->copy_freelist(this);
 }
 
-void CodeRootSetTable::nmethods_do(CodeBlobClosure* blk) {
+void G1CodeRootSetTable::nmethods_do(CodeBlobClosure* blk) {
   for (int index = 0; index < table_size(); ++index) {
     for (Entry* e = bucket(index); e != NULL; e = e->next()) {
       blk->do_code_blob(e->literal());
@@ -175,7 +131,7 @@
 }
 
 template<typename CB>
-int CodeRootSetTable::remove_if(CB& should_remove) {
+int G1CodeRootSetTable::remove_if(CB& should_remove) {
   int num_removed = 0;
   for (int index = 0; index < table_size(); ++index) {
     Entry* previous = NULL;
@@ -198,52 +154,52 @@
   delete _table;
 }
 
-CodeRootSetTable* G1CodeRootSet::load_acquire_table() {
-  return (CodeRootSetTable*) OrderAccess::load_ptr_acquire(&_table);
+G1CodeRootSetTable* G1CodeRootSet::load_acquire_table() {
+  return (G1CodeRootSetTable*) OrderAccess::load_ptr_acquire(&_table);
 }
 
 void G1CodeRootSet::allocate_small_table() {
-  CodeRootSetTable* temp = new CodeRootSetTable(SmallSize);
+  G1CodeRootSetTable* temp = new G1CodeRootSetTable(SmallSize);
 
   OrderAccess::release_store_ptr(&_table, temp);
 }
 
-void CodeRootSetTable::purge_list_append(CodeRootSetTable* table) {
+void G1CodeRootSetTable::purge_list_append(G1CodeRootSetTable* table) {
   for (;;) {
     table->_purge_next = _purge_list;
-    CodeRootSetTable* old = (CodeRootSetTable*) Atomic::cmpxchg_ptr(table, &_purge_list, table->_purge_next);
+    G1CodeRootSetTable* old = (G1CodeRootSetTable*) Atomic::cmpxchg_ptr(table, &_purge_list, table->_purge_next);
     if (old == table->_purge_next) {
       break;
     }
   }
 }
 
-void CodeRootSetTable::purge() {
-  CodeRootSetTable* table = _purge_list;
+void G1CodeRootSetTable::purge() {
+  G1CodeRootSetTable* table = _purge_list;
   _purge_list = NULL;
   while (table != NULL) {
-    CodeRootSetTable* to_purge = table;
+    G1CodeRootSetTable* to_purge = table;
     table = table->_purge_next;
     delete to_purge;
   }
 }
 
 void G1CodeRootSet::move_to_large() {
-  CodeRootSetTable* temp = new CodeRootSetTable(LargeSize);
+  G1CodeRootSetTable* temp = new G1CodeRootSetTable(LargeSize);
 
   _table->copy_to(temp);
 
-  CodeRootSetTable::purge_list_append(_table);
+  G1CodeRootSetTable::purge_list_append(_table);
 
   OrderAccess::release_store_ptr(&_table, temp);
 }
 
 void G1CodeRootSet::purge() {
-  CodeRootSetTable::purge();
+  G1CodeRootSetTable::purge();
 }
 
 size_t G1CodeRootSet::static_mem_size() {
-  return CodeRootSetTable::static_mem_size();
+  return G1CodeRootSetTable::static_mem_size();
 }
 
 void G1CodeRootSet::add(nmethod* method) {
@@ -278,7 +234,7 @@
 }
 
 bool G1CodeRootSet::contains(nmethod* method) {
-  CodeRootSetTable* table = load_acquire_table(); // contains() may be called outside of lock, so ensure mem sync.
+  G1CodeRootSetTable* table = load_acquire_table(); // contains() may be called outside of lock, so ensure mem sync.
   if (table != NULL) {
     return table->contains(method);
   }
@@ -348,67 +304,3 @@
     clear();
   }
 }
-
-#ifndef PRODUCT
-
-class G1CodeRootSetTest {
- public:
-  static void test() {
-    {
-      G1CodeRootSet set1;
-      assert(set1.is_empty(), "Code root set must be initially empty but is not.");
-
-      assert(G1CodeRootSet::static_mem_size() == sizeof(void*),
-             "The code root set's static memory usage is incorrect, " SIZE_FORMAT " bytes", G1CodeRootSet::static_mem_size());
-
-      set1.add((nmethod*)1);
-      assert(set1.length() == 1, "Added exactly one element, but set contains "
-             SIZE_FORMAT " elements", set1.length());
-
-      const size_t num_to_add = (size_t)G1CodeRootSet::Threshold + 1;
-
-      for (size_t i = 1; i <= num_to_add; i++) {
-        set1.add((nmethod*)1);
-      }
-      assert(set1.length() == 1,
-             "Duplicate detection should not have increased the set size but "
-             "is " SIZE_FORMAT, set1.length());
-
-      for (size_t i = 2; i <= num_to_add; i++) {
-        set1.add((nmethod*)(uintptr_t)(i));
-      }
-      assert(set1.length() == num_to_add,
-             "After adding in total " SIZE_FORMAT " distinct code roots, they "
-             "need to be in the set, but there are only " SIZE_FORMAT,
-             num_to_add, set1.length());
-
-      assert(CodeRootSetTable::_purge_list != NULL, "should have grown to large hashtable");
-
-      size_t num_popped = 0;
-      for (size_t i = 1; i <= num_to_add; i++) {
-        bool removed = set1.remove((nmethod*)i);
-        if (removed) {
-          num_popped += 1;
-        } else {
-          break;
-        }
-      }
-      assert(num_popped == num_to_add,
-             "Managed to pop " SIZE_FORMAT " code roots, but only " SIZE_FORMAT " "
-             "were added", num_popped, num_to_add);
-      assert(CodeRootSetTable::_purge_list != NULL, "should have grown to large hashtable");
-
-      G1CodeRootSet::purge();
-
-      assert(CodeRootSetTable::_purge_list == NULL, "should have purged old small tables");
-
-    }
-
-  }
-};
-
-void TestCodeCacheRemSet_test() {
-  G1CodeRootSetTest::test();
-}
-
-#endif

--- a/hotspot/src/share/vm/gc/g1/g1CodeCacheRemSet.hpp	Mon Aug 22 16:43:56 2016 +0300
+++ b/hotspot/src/share/vm/gc/g1/g1CodeCacheRemSet.hpp	Mon Aug 29 20:15:12 2016 +0300
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2014, 2015, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2014, 2016, 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
@@ -28,7 +28,7 @@
 #include "memory/allocation.hpp"
 
 class CodeBlobClosure;
-class CodeRootSetTable;
+class G1CodeRootSetTable;
 class HeapRegion;
 class nmethod;
 
@@ -42,8 +42,8 @@
   const static size_t Threshold = 24;
   const static size_t LargeSize = 512;
 
-  CodeRootSetTable* _table;
-  CodeRootSetTable* load_acquire_table();
+  G1CodeRootSetTable* _table;
+  G1CodeRootSetTable* load_acquire_table();
 
   size_t _length;
 

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/hotspot/src/share/vm/gc/g1/g1CodeRootSetTable.hpp	Mon Aug 29 20:15:12 2016 +0300
@@ -0,0 +1,76 @@
+/*
+ * Copyright (c) 2016, 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.
+ */
+
+#ifndef SHARE_VM_GC_G1_G1CODEROOTSETTABLE_HPP
+#define SHARE_VM_GC_G1_G1CODEROOTSETTABLE_HPP
+
+#include "utilities/hashtable.hpp"
+
+class nmethod;
+
+class G1CodeRootSetTable : public Hashtable<nmethod*, mtGC> {
+  friend class G1CodeRootSetTest;
+  typedef HashtableEntry<nmethod*, mtGC> Entry;
+
+  static G1CodeRootSetTable* volatile _purge_list;
+
+  G1CodeRootSetTable* _purge_next;
+
+  unsigned int compute_hash(nmethod* nm) {
+    uintptr_t hash = (uintptr_t)nm;
+    return hash ^ (hash >> 7); // code heap blocks are 128byte aligned
+  }
+
+  void remove_entry(Entry* e, Entry* previous);
+  Entry* new_entry(nmethod* nm);
+
+ public:
+  G1CodeRootSetTable(int size) : Hashtable<nmethod*, mtGC>(size, sizeof(Entry)), _purge_next(NULL) {}
+  ~G1CodeRootSetTable();
+
+  // Needs to be protected by locks
+  bool add(nmethod* nm);
+  bool remove(nmethod* nm);
+
+  // Can be called without locking
+  bool contains(nmethod* nm);
+
+  int entry_size() const { return BasicHashtable<mtGC>::entry_size(); }
+
+  void copy_to(G1CodeRootSetTable* new_table);
+  void nmethods_do(CodeBlobClosure* blk);
+
+  template<typename CB>
+  int remove_if(CB& should_remove);
+
+  static void purge_list_append(G1CodeRootSetTable* tbl);
+  static void purge();
+
+  static size_t static_mem_size() {
+    return sizeof(_purge_list);
+  }
+
+  size_t mem_size();
+};
+
+#endif /* SHARE_VM_GC_G1_G1CODEROOTSETTABLE_HPP */

--- a/hotspot/src/share/vm/utilities/internalVMTests.cpp	Mon Aug 22 16:43:56 2016 +0300
+++ b/hotspot/src/share/vm/utilities/internalVMTests.cpp	Mon Aug 29 20:15:12 2016 +0300
@@ -89,7 +89,6 @@
 #if INCLUDE_ALL_GCS
   run_unit_test(TestG1BiasedArray_test);
   run_unit_test(TestBufferingOopClosure_test);
-  run_unit_test(TestCodeCacheRemSet_test);
   if (UseG1GC) {
     run_unit_test(FreeRegionList_test);
     run_unit_test(IHOP_test);

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/hotspot/test/native/gc/g1/test_g1CodeCacheRemSet.cpp	Mon Aug 29 20:15:12 2016 +0300
@@ -0,0 +1,94 @@
+/*
+ * Copyright (c) 2014, 2016, 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 "gc/g1/g1CodeRootSetTable.hpp"
+#include "gc/g1/g1CodeCacheRemSet.hpp"
+#include "unittest.hpp"
+
+class G1CodeRootSetTest : public ::testing::Test {
+ public:
+
+  size_t threshold() {
+    return G1CodeRootSet::Threshold;
+  }
+
+  G1CodeRootSetTable* purge_list() {
+    return G1CodeRootSetTable::_purge_list;
+  }
+};
+
+TEST_VM_F(G1CodeRootSetTest, g1_code_cache_rem_set) {
+  G1CodeRootSet root_set;
+
+  ASSERT_TRUE(root_set.is_empty()) << "Code root set must be initially empty "
+          "but is not.";
+
+  ASSERT_EQ(G1CodeRootSet::static_mem_size(), sizeof (void*)) <<
+          "The code root set's static memory usage is incorrect, "
+          << G1CodeRootSet::static_mem_size() << " bytes";
+
+  root_set.add((nmethod*) 1);
+  ASSERT_EQ(root_set.length(), (size_t) 1) << "Added exactly one element, but"
+          " set contains " << root_set.length() << " elements";
+
+  const size_t num_to_add = (size_t) threshold() + 1;
+
+  for (size_t i = 1; i <= num_to_add; i++) {
+    root_set.add((nmethod*) 1);
+  }
+  ASSERT_EQ(root_set.length(), (size_t) 1)
+          << "Duplicate detection should not have increased the set size but "
+          << "is " << root_set.length();
+
+  for (size_t i = 2; i <= num_to_add; i++) {
+    root_set.add((nmethod*) (uintptr_t) (i));
+  }
+
+  ASSERT_EQ(root_set.length(), num_to_add)
+          << "After adding in total " << num_to_add << " distinct code roots, "
+          "they need to be in the set, but there are only " << root_set.length();
+
+  ASSERT_NE(purge_list(), (G1CodeRootSetTable*) NULL)
+          << "should have grown to large hashtable";
+
+  size_t num_popped = 0;
+  for (size_t i = 1; i <= num_to_add; i++) {
+    bool removed = root_set.remove((nmethod*) i);
+    if (removed) {
+      num_popped += 1;
+    } else {
+      break;
+    }
+  }
+  ASSERT_EQ(num_popped, num_to_add)
+          << "Managed to pop " << num_popped << " code roots, but only "
+          << num_to_add << " were added";
+  ASSERT_NE(purge_list(), (G1CodeRootSetTable*) NULL)
+          << "should have grown to large hashtable";
+
+  G1CodeRootSet::purge();
+
+  ASSERT_EQ(purge_list(), (G1CodeRootSetTable*) NULL)
+          << "should have purged old small tables";
+}