8014659: NPG: performance counters for compressed klass space

Reviewed-by: mgerdin, coleenp, hseigel, jmasa, ctornqvi

hotspot/src/share/vm/gc_implementation/g1/g1MonitoringSupport.cpp

@@ -262,6 +262,7 @@ void G1MonitoringSupport::update_sizes() {
     old_collection_counters()->update_all();
     young_collection_counters()->update_all();
     MetaspaceCounters::update_performance_counters();
+    CompressedClassSpaceCounters::update_performance_counters();
   }
 }
 

hotspot/src/share/vm/gc_implementation/parallelScavenge/parallelScavengeHeap.cpp

@@ -216,6 +216,7 @@ void ParallelScavengeHeap::update_counters() {
   young_gen()->update_counters();
   old_gen()->update_counters();
   MetaspaceCounters::update_performance_counters();
+  CompressedClassSpaceCounters::update_performance_counters();
 }
 
 size_t ParallelScavengeHeap::capacity() const {

hotspot/src/share/vm/memory/genCollectedHeap.cpp

@@ -1211,6 +1211,7 @@ void GenCollectedHeap::gc_epilogue(bool full) {
   }
 
   MetaspaceCounters::update_performance_counters();
+  CompressedClassSpaceCounters::update_performance_counters();
 
   always_do_update_barrier = UseConcMarkSweepGC;
 };

hotspot/src/share/vm/memory/metaspace.cpp

@@ -2480,16 +2480,13 @@ void SpaceManager::mangle_freed_chunks() {
 size_t MetaspaceAux::_allocated_capacity_words[] = {0, 0};
 size_t MetaspaceAux::_allocated_used_words[] = {0, 0};
 
+size_t MetaspaceAux::free_bytes(Metaspace::MetadataType mdtype) {
+  VirtualSpaceList* list = Metaspace::get_space_list(mdtype);
+  return list == NULL ? 0 : list->free_bytes();
+}
+
 size_t MetaspaceAux::free_bytes() {
-  size_t result = 0;
-  if (Metaspace::using_class_space() &&
-      (Metaspace::class_space_list() != NULL)) {
-    result = result + Metaspace::class_space_list()->free_bytes();
-  }
-  if (Metaspace::space_list() != NULL) {
-    result = result + Metaspace::space_list()->free_bytes();
-  }
-  return result;
+  return free_bytes(Metaspace::ClassType) + free_bytes(Metaspace::NonClassType);
 }
 
 void MetaspaceAux::dec_capacity(Metaspace::MetadataType mdtype, size_t words) {
@@ -2571,23 +2568,18 @@ size_t MetaspaceAux::capacity_bytes_slow(Metaspace::MetadataType mdtype) {
 }
 
 size_t MetaspaceAux::reserved_in_bytes(Metaspace::MetadataType mdtype) {
-  if (mdtype == Metaspace::ClassType) {
-    return Metaspace::using_class_space() ?
-           Metaspace::class_space_list()->virtual_space_total() * BytesPerWord : 0;
-  } else {
-    return Metaspace::space_list()->virtual_space_total() * BytesPerWord;
-  }
+  VirtualSpaceList* list = Metaspace::get_space_list(mdtype);
+  return list == NULL ? 0 : list->virtual_space_total();
 }
 
 size_t MetaspaceAux::min_chunk_size() { return Metaspace::first_chunk_word_size(); }
 
 size_t MetaspaceAux::free_chunks_total(Metaspace::MetadataType mdtype) {
-  if ((mdtype == Metaspace::ClassType) && !Metaspace::using_class_space()) {
+  VirtualSpaceList* list = Metaspace::get_space_list(mdtype);
+  if (list == NULL) {
     return 0;
   }
-  ChunkManager* chunk = (mdtype == Metaspace::ClassType) ?
-                         Metaspace::class_space_list()->chunk_manager() :
-                         Metaspace::space_list()->chunk_manager();
+  ChunkManager* chunk = list->chunk_manager();
   chunk->slow_verify();
   return chunk->free_chunks_total();
 }

hotspot/src/share/vm/memory/metaspace.hpp

@@ -136,6 +136,10 @@ class Metaspace : public CHeapObj<mtClass> {
 
   static VirtualSpaceList* space_list()       { return _space_list; }
   static VirtualSpaceList* class_space_list() { return _class_space_list; }
+  static VirtualSpaceList* get_space_list(MetadataType mdtype) {
+    assert(mdtype != MetadataTypeCount, "MetadaTypeCount can't be used as mdtype");
+    return mdtype == ClassType ? class_space_list() : space_list();
+  }
 
   // This is used by DumpSharedSpaces only, where only _vsm is used. So we will
   // maintain a single list for now.
@@ -218,7 +222,6 @@ class Metaspace : public CHeapObj<mtClass> {
 
 class MetaspaceAux : AllStatic {
   static size_t free_chunks_total(Metaspace::MetadataType mdtype);
-  static size_t free_chunks_total_in_bytes(Metaspace::MetadataType mdtype);
 
  public:
   // Statistics for class space and data space in metaspace.
@@ -262,6 +265,7 @@ class MetaspaceAux : AllStatic {
   // Used by MetaspaceCounters
   static size_t free_chunks_total();
   static size_t free_chunks_total_in_bytes();
+  static size_t free_chunks_total_in_bytes(Metaspace::MetadataType mdtype);
 
   static size_t allocated_capacity_words(Metaspace::MetadataType mdtype) {
     return _allocated_capacity_words[mdtype];
@@ -294,6 +298,7 @@ class MetaspaceAux : AllStatic {
   }
 
   static size_t free_bytes();
+  static size_t free_bytes(Metaspace::MetadataType mdtype);
 
   // Total capacity in all Metaspaces
   static size_t capacity_bytes_slow() {

hotspot/src/share/vm/memory/metaspaceCounters.cpp

@@ -25,11 +25,47 @@
 #include "precompiled.hpp"
 #include "memory/metaspaceCounters.hpp"
 #include "memory/resourceArea.hpp"
+#include "runtime/globals.hpp"
+#include "runtime/perfData.hpp"
 #include "utilities/exceptions.hpp"
 
-MetaspaceCounters* MetaspaceCounters::_metaspace_counters = NULL;
+class MetaspacePerfCounters: public CHeapObj<mtInternal> {
+  friend class VMStructs;
+  PerfVariable*      _capacity;
+  PerfVariable*      _used;
+  PerfVariable*      _max_capacity;
 
-size_t MetaspaceCounters::calc_total_capacity() {
+  PerfVariable* create_variable(const char *ns, const char *name, size_t value, TRAPS) {
+    const char *path = PerfDataManager::counter_name(ns, name);
+    return PerfDataManager::create_variable(SUN_GC, path, PerfData::U_Bytes, value, THREAD);
+  }
+
+  void create_constant(const char *ns, const char *name, size_t value, TRAPS) {
+    const char *path = PerfDataManager::counter_name(ns, name);
+    PerfDataManager::create_constant(SUN_GC, path, PerfData::U_Bytes, value, THREAD);
+  }
+
+ public:
+  MetaspacePerfCounters(const char* ns, size_t min_capacity, size_t curr_capacity, size_t max_capacity, size_t used) {
+    EXCEPTION_MARK;
+    ResourceMark rm;
+
+    create_constant(ns, "minCapacity", min_capacity, THREAD);
+    _capacity = create_variable(ns, "capacity", curr_capacity, THREAD);
+    _max_capacity = create_variable(ns, "maxCapacity", max_capacity, THREAD);
+    _used = create_variable(ns, "used", used, THREAD);
+  }
+
+  void update(size_t capacity, size_t max_capacity, size_t used) {
+    _capacity->set_value(capacity);
+    _max_capacity->set_value(max_capacity);
+    _used->set_value(used);
+  }
+};
+
+MetaspacePerfCounters* MetaspaceCounters::_perf_counters = NULL;
+
+size_t MetaspaceCounters::calculate_capacity() {
   // The total capacity is the sum of
   //   1) capacity of Metachunks in use by all Metaspaces
   //   2) unused space at the end of each Metachunk
@@ -39,95 +75,65 @@ size_t MetaspaceCounters::calc_total_capacity() {
   return total_capacity;
 }
 
-MetaspaceCounters::MetaspaceCounters() :
-    _capacity(NULL),
-    _used(NULL),
-    _max_capacity(NULL) {
-  if (UsePerfData) {
-    size_t min_capacity = MetaspaceAux::min_chunk_size();
-    size_t max_capacity = MetaspaceAux::reserved_in_bytes();
-    size_t curr_capacity = calc_total_capacity();
-    size_t used = MetaspaceAux::allocated_used_bytes();
-
-    initialize(min_capacity, max_capacity, curr_capacity, used);
-  }
-}
-
-static PerfVariable* create_ms_variable(const char *ns,
-                                        const char *name,
-                                        size_t value,
-                                        TRAPS) {
-  const char *path = PerfDataManager::counter_name(ns, name);
-  PerfVariable *result =
-      PerfDataManager::create_variable(SUN_GC, path, PerfData::U_Bytes, value,
-                                       CHECK_NULL);
-  return result;
-}
-
-static void create_ms_constant(const char *ns,
-                               const char *name,
-                               size_t value,
-                               TRAPS) {
-  const char *path = PerfDataManager::counter_name(ns, name);
-  PerfDataManager::create_constant(SUN_GC, path, PerfData::U_Bytes, value, CHECK);
-}
-
-void MetaspaceCounters::initialize(size_t min_capacity,
-                                   size_t max_capacity,
-                                   size_t curr_capacity,
-                                   size_t used) {
-
-  if (UsePerfData) {
-    EXCEPTION_MARK;
-    ResourceMark rm;
-
-    const char *ms = "metaspace";
-
-    create_ms_constant(ms, "minCapacity", min_capacity, CHECK);
-    _max_capacity = create_ms_variable(ms, "maxCapacity", max_capacity, CHECK);
-    _capacity = create_ms_variable(ms, "capacity", curr_capacity, CHECK);
-    _used = create_ms_variable(ms, "used", used, CHECK);
-  }
-}
-
-void MetaspaceCounters::update_capacity() {
-  assert(UsePerfData, "Should not be called unless being used");
-  size_t total_capacity = calc_total_capacity();
-  _capacity->set_value(total_capacity);
-}
-
-void MetaspaceCounters::update_used() {
-  assert(UsePerfData, "Should not be called unless being used");
-  size_t used_in_bytes = MetaspaceAux::allocated_used_bytes();
-  _used->set_value(used_in_bytes);
-}
-
-void MetaspaceCounters::update_max_capacity() {
-  assert(UsePerfData, "Should not be called unless being used");
-  assert(_max_capacity != NULL, "Should be initialized");
-  size_t reserved_in_bytes = MetaspaceAux::reserved_in_bytes();
-  _max_capacity->set_value(reserved_in_bytes);
-}
-
-void MetaspaceCounters::update_all() {
-  if (UsePerfData) {
-    update_used();
-    update_capacity();
-    update_max_capacity();
-  }
-}
-
 void MetaspaceCounters::initialize_performance_counters() {
   if (UsePerfData) {
-    assert(_metaspace_counters == NULL, "Should only be initialized once");
-    _metaspace_counters = new MetaspaceCounters();
+    assert(_perf_counters == NULL, "Should only be initialized once");
+
+    size_t min_capacity = MetaspaceAux::min_chunk_size();
+    size_t capacity = calculate_capacity();
+    size_t max_capacity = MetaspaceAux::reserved_in_bytes();
+    size_t used = MetaspaceAux::allocated_used_bytes();
+
+    _perf_counters = new MetaspacePerfCounters("metaspace", min_capacity, capacity, max_capacity, used);
   }
 }
 
 void MetaspaceCounters::update_performance_counters() {
   if (UsePerfData) {
-    assert(_metaspace_counters != NULL, "Should be initialized");
-    _metaspace_counters->update_all();
+    assert(_perf_counters != NULL, "Should be initialized");
+
+    size_t capacity = calculate_capacity();
+    size_t max_capacity = MetaspaceAux::reserved_in_bytes();
+    size_t used = MetaspaceAux::allocated_used_bytes();
+
+    _perf_counters->update(capacity, max_capacity, used);
   }
 }
 
+MetaspacePerfCounters* CompressedClassSpaceCounters::_perf_counters = NULL;
+
+size_t CompressedClassSpaceCounters::calculate_capacity() {
+    return MetaspaceAux::allocated_capacity_bytes(_class_type) +
+           MetaspaceAux::free_bytes(_class_type) +
+           MetaspaceAux::free_chunks_total_in_bytes(_class_type);
+}
+
+void CompressedClassSpaceCounters::update_performance_counters() {
+  if (UsePerfData && UseCompressedKlassPointers) {
+    assert(_perf_counters != NULL, "Should be initialized");
+
+    size_t capacity = calculate_capacity();
+    size_t max_capacity = MetaspaceAux::reserved_in_bytes(_class_type);
+    size_t used = MetaspaceAux::allocated_used_bytes(_class_type);
+
+    _perf_counters->update(capacity, max_capacity, used);
+  }
+}
+
+void CompressedClassSpaceCounters::initialize_performance_counters() {
+  if (UsePerfData) {
+    assert(_perf_counters == NULL, "Should only be initialized once");
+    const char* ns = "compressedclassspace";
+
+    if (UseCompressedKlassPointers) {
+      size_t min_capacity = MetaspaceAux::min_chunk_size();
+      size_t capacity = calculate_capacity();
+      size_t max_capacity = MetaspaceAux::reserved_in_bytes(_class_type);
+      size_t used = MetaspaceAux::allocated_used_bytes(_class_type);
+
+      _perf_counters = new MetaspacePerfCounters(ns, min_capacity, capacity, max_capacity, used);
+    } else {
+      _perf_counters = new MetaspacePerfCounters(ns, 0, 0, 0, 0);
+    }
+  }
+}

hotspot/src/share/vm/memory/metaspaceCounters.hpp

@@ -25,31 +25,27 @@
 #ifndef SHARE_VM_MEMORY_METASPACECOUNTERS_HPP
 #define SHARE_VM_MEMORY_METASPACECOUNTERS_HPP
 
-#include "runtime/perfData.hpp"
+#include "memory/metaspace.hpp"
+
+class MetaspacePerfCounters;
+
+class MetaspaceCounters: public AllStatic {
+  static MetaspacePerfCounters* _perf_counters;
+  static size_t calculate_capacity();
 
-class MetaspaceCounters: public CHeapObj<mtClass> {
-  friend class VMStructs;
-  PerfVariable*      _capacity;
-  PerfVariable*      _used;
-  PerfVariable*      _max_capacity;
-  static MetaspaceCounters* _metaspace_counters;
-  void initialize(size_t min_capacity,
-                  size_t max_capacity,
-                  size_t curr_capacity,
-                  size_t used);
-  size_t calc_total_capacity();
  public:
-  MetaspaceCounters();
-  ~MetaspaceCounters();
-
-  void update_capacity();
-  void update_used();
-  void update_max_capacity();
-
-  void update_all();
-
   static void initialize_performance_counters();
   static void update_performance_counters();
-
 };
+
+class CompressedClassSpaceCounters: public AllStatic {
+  static MetaspacePerfCounters* _perf_counters;
+  static size_t calculate_capacity();
+  static const Metaspace::MetadataType _class_type = Metaspace::ClassType;
+
+ public:
+  static void initialize_performance_counters();
+  static void update_performance_counters();
+};
+
 #endif // SHARE_VM_MEMORY_METASPACECOUNTERS_HPP

hotspot/src/share/vm/memory/universe.cpp

@@ -1101,6 +1101,8 @@ bool universe_post_init() {
 
   // Initialize performance counters for metaspaces
   MetaspaceCounters::initialize_performance_counters();
+  CompressedClassSpaceCounters::initialize_performance_counters();
+
   MemoryService::add_metaspace_memory_pools();
 
   GC_locker::unlock();  // allow gc after bootstrapping

hotspot/test/gc/metaspace/TestMetaspacePerfCounters.java

@@ -0,0 +1,104 @@
+/*
+ * Copyright (c) 2013, 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.
+ */
+
+import java.util.List;
+import java.util.ArrayList;
+
+import com.oracle.java.testlibrary.*;
+import static com.oracle.java.testlibrary.Asserts.*;
+
+/* @test TestMetaspacePerfCounters
+ * @bug 8014659
+ * @library /testlibrary
+ * @summary Tests that performance counters for metaspace and compressed class
+ *          space exists and works.
+ *
+ * @run main/othervm -XX:+IgnoreUnrecognizedVMOptions -XX:-UseCompressedOops -XX:-UseCompressedKlassPointers -XX:+UsePerfData -XX:+UseSerialGC TestMetaspacePerfCounters
+ * @run main/othervm -XX:+IgnoreUnrecognizedVMOptions -XX:-UseCompressedOops -XX:-UseCompressedKlassPointers -XX:+UsePerfData -XX:+UseParallelGC -XX:+UseParallelOldGC TestMetaspacePerfCounters
+ * @run main/othervm -XX:+IgnoreUnrecognizedVMOptions -XX:-UseCompressedOops -XX:-UseCompressedKlassPointers -XX:+UsePerfData -XX:+UseG1GC TestMetaspacePerfCounters
+ *
+ * @run main/othervm -XX:+IgnoreUnrecognizedVMOptions -XX:+UseCompressedOops -XX:+UseCompressedKlassPointers -XX:+UsePerfData -XX:+UseSerialGC TestMetaspacePerfCounters
+ * @run main/othervm -XX:+IgnoreUnrecognizedVMOptions -XX:+UseCompressedOops -XX:+UseCompressedKlassPointers -XX:+UsePerfData -XX:+UseParallelGC -XX:+UseParallelOldGC TestMetaspacePerfCounters
+ * @run main/othervm -XX:+IgnoreUnrecognizedVMOptions -XX:+UseCompressedOops -XX:+UseCompressedKlassPointers -XX:+UsePerfData -XX:+UseG1GC TestMetaspacePerfCounters
+ */
+public class TestMetaspacePerfCounters {
+    public static Class fooClass = null;
+    private static final String[] counterNames = {"minCapacity", "maxCapacity", "capacity", "used"};
+
+    public static void main(String[] args) throws Exception {
+        String metaspace = "sun.gc.metaspace";
+        String ccs = "sun.gc.compressedclassspace";
+
+        checkPerfCounters(metaspace);
+
+        if (isUsingCompressedClassPointers()) {
+            checkPerfCounters(ccs);
+            checkUsedIncreasesWhenLoadingClass(ccs);
+        } else {
+            checkEmptyPerfCounters(ccs);
+            checkUsedIncreasesWhenLoadingClass(metaspace);
+        }
+    }
+
+    private static void checkPerfCounters(String ns) throws Exception {
+        for (PerfCounter counter : countersInNamespace(ns)) {
+            String msg = "Expected " + counter.getName() + " to be larger than 0";
+            assertGT(counter.longValue(), 0L, msg);
+        }
+    }
+
+    private static void checkEmptyPerfCounters(String ns) throws Exception {
+        for (PerfCounter counter : countersInNamespace(ns)) {
+            String msg = "Expected " + counter.getName() + " to equal 0";
+            assertEQ(counter.longValue(), 0L, msg);
+        }
+    }
+
+    private static void checkUsedIncreasesWhenLoadingClass(String ns) throws Exception {
+        PerfCounter used = PerfCounters.findByName(ns + ".used");
+
+        long before = used.longValue();
+        fooClass = compileAndLoad("Foo", "public class Foo { }");
+        System.gc();
+        long after = used.longValue();
+
+        assertGT(after, before);
+    }
+
+    private static List<PerfCounter> countersInNamespace(String ns) throws Exception {
+        List<PerfCounter> counters = new ArrayList<>();
+        for (String name : counterNames) {
+            counters.add(PerfCounters.findByName(ns + "." + name));
+        }
+        return counters;
+    }
+
+    private static Class<?> compileAndLoad(String name, String source) throws Exception {
+        byte[] byteCode = InMemoryJavaCompiler.compile(name, source);
+        return ByteCodeLoader.load(name, byteCode);
+    }
+
+    private static boolean isUsingCompressedClassPointers() {
+        return Platform.is64bit() && InputArguments.contains("-XX:+UseCompressedKlassPointers");
+    }
+}

hotspot/test/testlibrary/AssertsTest.java

@@ -0,0 +1,237 @@
+/*
+ * Copyright (c) 2013, 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.
+ */
+
+import static com.oracle.java.testlibrary.Asserts.*;
+
+/* @test
+ * @summary Tests the different assertions in the Assert class
+ * @library /testlibrary
+ */
+public class AssertsTest {
+    private static class Foo implements Comparable<Foo> {
+        final int id;
+        public Foo(int id) {
+            this.id = id;
+        }
+
+        public int compareTo(Foo f) {
+            return new Integer(id).compareTo(new Integer(f.id));
+        }
+    }
+
+    public static void main(String[] args) throws Exception {
+        testLessThan();
+        testLessThanOrEqual();
+        testEquals();
+        testGreaterThanOrEqual();
+        testGreaterThan();
+        testNotEquals();
+        testNull();
+        testNotNull();
+        testTrue();
+        testFalse();
+    }
+
+    private static void testLessThan() throws Exception {
+        expectPass(Assertion.LT, 1, 2);
+
+        expectFail(Assertion.LT, 2, 2);
+        expectFail(Assertion.LT, 2, 1);
+        expectFail(Assertion.LT, null, 2);
+        expectFail(Assertion.LT, 2, null);
+    }
+
+    private static void testLessThanOrEqual() throws Exception {
+        expectPass(Assertion.LTE, 1, 2);
+        expectPass(Assertion.LTE, 2, 2);
+
+        expectFail(Assertion.LTE, 3, 2);
+        expectFail(Assertion.LTE, null, 2);
+        expectFail(Assertion.LTE, 2, null);
+    }
+
+    private static void testEquals() throws Exception {
+        expectPass(Assertion.EQ, 1, 1);
+        expectPass(Assertion.EQ, null, null);
+
+        Foo f1 = new Foo(1);
+        expectPass(Assertion.EQ, f1, f1);
+
+        Foo f2 = new Foo(1);
+        expectFail(Assertion.EQ, f1, f2);
+        expectFail(Assertion.LTE, null, 2);
+        expectFail(Assertion.LTE, 2, null);
+    }
+
+    private static void testGreaterThanOrEqual() throws Exception {
+        expectPass(Assertion.GTE, 1, 1);
+        expectPass(Assertion.GTE, 2, 1);
+
+        expectFail(Assertion.GTE, 1, 2);
+        expectFail(Assertion.GTE, null, 2);
+        expectFail(Assertion.GTE, 2, null);
+    }
+
+    private static void testGreaterThan() throws Exception {
+        expectPass(Assertion.GT, 2, 1);
+
+        expectFail(Assertion.GT, 1, 1);
+        expectFail(Assertion.GT, 1, 2);
+        expectFail(Assertion.GT, null, 2);
+        expectFail(Assertion.GT, 2, null);
+    }
+
+    private static void testNotEquals() throws Exception {
+        expectPass(Assertion.NE, null, 1);
+        expectPass(Assertion.NE, 1, null);
+
+        Foo f1 = new Foo(1);
+        Foo f2 = new Foo(1);
+        expectPass(Assertion.NE, f1, f2);
+
+        expectFail(Assertion.NE, null, null);
+        expectFail(Assertion.NE, f1, f1);
+        expectFail(Assertion.NE, 1, 1);
+    }
+
+    private static void testNull() throws Exception {
+        expectPass(Assertion.NULL, null);
+
+        expectFail(Assertion.NULL, 1);
+    }
+
+    private static void testNotNull() throws Exception {
+        expectPass(Assertion.NOTNULL, 1);
+
+        expectFail(Assertion.NOTNULL, null);
+    }
+
+    private static void testTrue() throws Exception {
+        expectPass(Assertion.TRUE, true);
+
+        expectFail(Assertion.TRUE, false);
+    }
+
+    private static void testFalse() throws Exception {
+        expectPass(Assertion.FALSE, false);
+
+        expectFail(Assertion.FALSE, true);
+    }
+
+    private static <T extends Comparable<T>> void expectPass(Assertion assertion, T ... args)
+        throws Exception {
+        Assertion.run(assertion, args);
+    }
+
+    private static <T extends Comparable<T>> void expectFail(Assertion assertion, T ... args)
+        throws Exception {
+        try {
+            Assertion.run(assertion, args);
+        } catch (RuntimeException e) {
+            return;
+        }
+        throw new Exception("Expected " + Assertion.format(assertion, (Object[]) args) +
+                            " to throw a RuntimeException");
+    }
+
+}
+
+enum Assertion {
+    LT, LTE, EQ, GTE, GT, NE, NULL, NOTNULL, FALSE, TRUE;
+
+    public static <T extends Comparable<T>> void run(Assertion assertion, T ... args) {
+        String msg = "Expected " + format(assertion, args) + " to pass";
+        switch (assertion) {
+            case LT:
+                assertLessThan(args[0], args[1], msg);
+                break;
+            case LTE:
+                assertLessThanOrEqual(args[0], args[1], msg);
+                break;
+            case EQ:
+                assertEquals(args[0], args[1], msg);
+                break;
+            case GTE:
+                assertGreaterThanOrEqual(args[0], args[1], msg);
+                break;
+            case GT:
+                assertGreaterThan(args[0], args[1], msg);
+                break;
+            case NE:
+                assertNotEquals(args[0], args[1], msg);
+                break;
+            case NULL:
+                assertNull(args == null ? args : args[0], msg);
+                break;
+            case NOTNULL:
+                assertNotNull(args == null ? args : args[0], msg);
+                break;
+            case FALSE:
+                assertFalse((Boolean) args[0], msg);
+                break;
+            case TRUE:
+                assertTrue((Boolean) args[0], msg);
+                break;
+            default:
+                // do nothing
+        }
+    }
+
+    public static String format(Assertion assertion, Object ... args) {
+        switch (assertion) {
+            case LT:
+                return asString("assertLessThan", args);
+            case LTE:
+                return asString("assertLessThanOrEqual", args);
+            case EQ:
+                return asString("assertEquals", args);
+            case GTE:
+                return asString("assertGreaterThanOrEquals", args);
+            case GT:
+                return asString("assertGreaterThan", args);
+            case NE:
+                return asString("assertNotEquals", args);
+            case NULL:
+                return asString("assertNull", args);
+            case NOTNULL:
+                return asString("assertNotNull", args);
+            case FALSE:
+                return asString("assertFalse", args);
+            case TRUE:
+                return asString("assertTrue", args);
+            default:
+                return "";
+        }
+    }
+
+    private static String asString(String assertion, Object ... args) {
+        if (args == null) {
+            return String.format("%s(null)", assertion);
+        }
+        if (args.length == 1) {
+            return String.format("%s(%s)", assertion, args[0]);
+        } else {
+            return String.format("%s(%s, %s)", assertion, args[0], args[1]);
+        }
+    }
+}

hotspot/test/testlibrary/com/oracle/java/testlibrary/Asserts.java

@@ -0,0 +1,395 @@
+/*
+ * Copyright (c) 2013, 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.
+ */
+
+package com.oracle.java.testlibrary;
+
+/**
+ * Asserts that can be used for verifying assumptions in tests.
+ *
+ * An assertion will throw a {@link RuntimeException} if the assertion isn't
+ * valid.  All the asserts can be imported into a test by using a static
+ * import:
+ *
+ * <pre>
+ * {@code
+ * import static com.oracle.java.testlibrary.Asserts.*;
+ * }
+ *
+ * Always provide a message describing the assumption if the line number of the
+ * failing assertion isn't enough to understand why the assumption failed. For
+ * example, if the assertion is in a loop or in a method that is called
+ * multiple times, then the line number won't provide enough context to
+ * understand the failure.
+ * </pre>
+ */
+public class Asserts {
+
+    /**
+     * Shorthand for {@link #assertLessThan(T, T)}.
+     *
+     * @see #assertLessThan(T, T)
+     */
+    public static <T extends Comparable<T>> void assertLT(T lhs, T rhs) {
+        assertLessThan(lhs, rhs);
+    }
+
+    /**
+     * Shorthand for {@link #assertLessThan(T, T, String)}.
+     *
+     * @see #assertLessThan(T, T, String)
+     */
+    public static <T extends Comparable<T>> void assertLT(T lhs, T rhs, String msg) {
+        assertLessThan(lhs, rhs, msg);
+    }
+
+    /**
+     * Calls {@link #assertLessThan(T, T, String)} with a default message.
+     *
+     * @see #assertLessThan(T, T, String)
+     */
+    public static <T extends Comparable<T>> void assertLessThan(T lhs, T rhs) {
+        String msg = "Expected that " + format(lhs) + " < " + format(rhs);
+        assertLessThan(lhs, rhs, msg);
+    }
+
+    /**
+     * Asserts that {@code lhs} is less than {@code rhs}.
+     *
+     * @param lhs The left hand side of the comparison.
+     * @param rhs The right hand side of the comparison.
+     * @param msg A description of the assumption.
+     * @throws RuntimeException if the assertion isn't valid.
+     */
+    public static <T extends Comparable<T>>void assertLessThan(T lhs, T rhs, String msg) {
+        assertTrue(compare(lhs, rhs, msg) < 0, msg);
+    }
+
+    /**
+     * Shorthand for {@link #assertLessThanOrEqual(T, T)}.
+     *
+     * @see #assertLessThanOrEqual(T, T)
+     */
+    public static <T extends Comparable<T>> void assertLTE(T lhs, T rhs) {
+        assertLessThanOrEqual(lhs, rhs);
+    }
+
+    /**
+     * Shorthand for {@link #assertLessThanOrEqual(T, T, String)}.
+     *
+     * @see #assertLessThanOrEqual(T, T, String)
+     */
+    public static <T extends Comparable<T>> void assertLTE(T lhs, T rhs, String msg) {
+        assertLessThanOrEqual(lhs, rhs, msg);
+    }
+
+    /**
+     * Calls {@link #assertLessThanOrEqual(T, T, String)} with a default message.
+     *
+     * @see #assertLessThanOrEqual(T, T, String)
+     */
+    public static <T extends Comparable<T>> void assertLessThanOrEqual(T lhs, T rhs) {
+        String msg = "Expected that " + format(lhs) + " <= " + format(rhs);
+        assertLessThanOrEqual(lhs, rhs, msg);
+    }
+
+    /**
+     * Asserts that {@code lhs} is less than or equal to {@code rhs}.
+     *
+     * @param lhs The left hand side of the comparison.
+     * @param rhs The right hand side of the comparison.
+     * @param msg A description of the assumption.
+     * @throws RuntimeException if the assertion isn't valid.
+     */
+    public static <T extends Comparable<T>> void assertLessThanOrEqual(T lhs, T rhs, String msg) {
+        assertTrue(compare(lhs, rhs, msg) <= 0, msg);
+    }
+
+    /**
+     * Shorthand for {@link #assertEquals(T, T)}.
+     *
+     * @see #assertEquals(T, T)
+     */
+    public static void assertEQ(Object lhs, Object rhs) {
+        assertEquals(lhs, rhs);
+    }
+
+    /**
+     * Shorthand for {@link #assertEquals(T, T, String)}.
+     *
+     * @see #assertEquals(T, T, String)
+     */
+    public static void assertEQ(Object lhs, Object rhs, String msg) {
+        assertEquals(lhs, rhs, msg);
+    }
+
+    /**
+     * Calls {@link #assertEquals(T, T, String)} with a default message.
+     *
+     * @see #assertEquals(T, T, String)
+     */
+    public static void assertEquals(Object lhs, Object rhs) {
+        String msg = "Expected " + format(lhs) + " to equal " + format(rhs);
+        assertEquals(lhs, rhs, msg);
+    }
+
+    /**
+     * Asserts that {@code lhs} is equal to {@code rhs}.
+     *
+     * @param lhs The left hand side of the comparison.
+     * @param rhs The right hand side of the comparison.
+     * @param msg A description of the assumption.
+     * @throws RuntimeException if the assertion isn't valid.
+     */
+    public static void assertEquals(Object lhs, Object rhs, String msg) {
+        if (lhs == null) {
+            if (rhs != null) {
+                error(msg);
+            }
+        } else {
+            assertTrue(lhs.equals(rhs), msg);
+        }
+    }
+
+    /**
+     * Shorthand for {@link #assertGreaterThanOrEqual(T, T)}.
+     *
+     * @see #assertGreaterThanOrEqual(T, T)
+     */
+    public static <T extends Comparable<T>> void assertGTE(T lhs, T rhs) {
+        assertGreaterThanOrEqual(lhs, rhs);
+    }
+
+    /**
+     * Shorthand for {@link #assertGreaterThanOrEqual(T, T, String)}.
+     *
+     * @see #assertGreaterThanOrEqual(T, T, String)
+     */
+    public static <T extends Comparable<T>> void assertGTE(T lhs, T rhs, String msg) {
+        assertGreaterThanOrEqual(lhs, rhs, msg);
+    }
+
+    /**
+     * Calls {@link #assertGreaterThanOrEqual(T, T, String)} with a default message.
+     *
+     * @see #assertGreaterThanOrEqual(T, T, String)
+     */
+    public static <T extends Comparable<T>> void assertGreaterThanOrEqual(T lhs, T rhs) {
+        String msg = "Expected that " + format(lhs) + " >= " + format(rhs);
+        assertGreaterThanOrEqual(lhs, rhs, msg);
+    }
+
+    /**
+     * Asserts that {@code lhs} is greater than or equal to {@code rhs}.
+     *
+     * @param lhs The left hand side of the comparison.
+     * @param rhs The right hand side of the comparison.
+     * @param msg A description of the assumption.
+     * @throws RuntimeException if the assertion isn't valid.
+     */
+    public static <T extends Comparable<T>> void assertGreaterThanOrEqual(T lhs, T rhs, String msg) {
+        assertTrue(compare(lhs, rhs, msg) >= 0, msg);
+    }
+
+    /**
+     * Shorthand for {@link #assertGreaterThan(T, T)}.
+     *
+     * @see #assertGreaterThan(T, T)
+     */
+    public static <T extends Comparable<T>> void assertGT(T lhs, T rhs) {
+        assertGreaterThan(lhs, rhs);
+    }
+
+    /**
+     * Shorthand for {@link #assertGreaterThan(T, T, String)}.
+     *
+     * @see #assertGreaterThan(T, T, String)
+     */
+    public static <T extends Comparable<T>> void assertGT(T lhs, T rhs, String msg) {
+        assertGreaterThan(lhs, rhs, msg);
+    }
+
+    /**
+     * Calls {@link #assertGreaterThan(T, T, String)} with a default message.
+     *
+     * @see #assertGreaterThan(T, T, String)
+     */
+    public static <T extends Comparable<T>> void assertGreaterThan(T lhs, T rhs) {
+        String msg = "Expected that " + format(lhs) + " > " + format(rhs);
+        assertGreaterThan(lhs, rhs, msg);
+    }
+
+    /**
+     * Asserts that {@code lhs} is greater than {@code rhs}.
+     *
+     * @param lhs The left hand side of the comparison.
+     * @param rhs The right hand side of the comparison.
+     * @param msg A description of the assumption.
+     * @throws RuntimeException if the assertion isn't valid.
+     */
+    public static <T extends Comparable<T>> void assertGreaterThan(T lhs, T rhs, String msg) {
+        assertTrue(compare(lhs, rhs, msg) > 0, msg);
+    }
+
+    /**
+     * Shorthand for {@link #assertNotEquals(T, T)}.
+     *
+     * @see #assertNotEquals(T, T)
+     */
+    public static void assertNE(Object lhs, Object rhs) {
+        assertNotEquals(lhs, rhs);
+    }
+
+    /**
+     * Shorthand for {@link #assertNotEquals(T, T, String)}.
+     *
+     * @see #assertNotEquals(T, T, String)
+     */
+    public static void assertNE(Object lhs, Object rhs, String msg) {
+        assertNotEquals(lhs, rhs, msg);
+    }
+
+    /**
+     * Calls {@link #assertNotEquals(T, T, String)} with a default message.
+     *
+     * @see #assertNotEquals(T, T, String)
+     */
+    public static void assertNotEquals(Object lhs, Object rhs) {
+        String msg = "Expected " + format(lhs) + " to not equal " + format(rhs);
+        assertNotEquals(lhs, rhs, msg);
+    }
+
+    /**
+     * Asserts that {@code lhs} is not equal to {@code rhs}.
+     *
+     * @param lhs The left hand side of the comparison.
+     * @param rhs The right hand side of the comparison.
+     * @param msg A description of the assumption.
+     * @throws RuntimeException if the assertion isn't valid.
+     */
+    public static void assertNotEquals(Object lhs, Object rhs, String msg) {
+        if (lhs == null) {
+            if (rhs == null) {
+                error(msg);
+            }
+        } else {
+            assertFalse(lhs.equals(rhs), msg);
+        }
+    }
+
+    /**
+     * Calls {@link #assertNull(Object, String)} with a default message.
+     *
+     * @see #assertNull(Object, String)
+     */
+    public static void assertNull(Object o) {
+        assertNull(o, "Expected " + format(o) + " to be null");
+    }
+
+    /**
+     * Asserts that {@code o} is null.
+     *
+     * @param o The reference assumed to be null.
+     * @param msg A description of the assumption.
+     * @throws RuntimeException if the assertion isn't valid.
+     */
+    public static void assertNull(Object o, String msg) {
+        assertEquals(o, null, msg);
+    }
+
+    /**
+     * Calls {@link #assertNotNull(Object, String)} with a default message.
+     *
+     * @see #assertNotNull(Object, String)
+     */
+    public static void assertNotNull(Object o) {
+        assertNotNull(o, "Expected non null reference");
+    }
+
+    /**
+     * Asserts that {@code o} is <i>not</i> null.
+     *
+     * @param o The reference assumed <i>not</i> to be null,
+     * @param msg A description of the assumption.
+     * @throws RuntimeException if the assertion isn't valid.
+     */
+    public static void assertNotNull(Object o, String msg) {
+        assertNotEquals(o, null, msg);
+    }
+
+    /**
+     * Calls {@link #assertFalse(boolean, String)} with a default message.
+     *
+     * @see #assertFalse(boolean, String)
+     */
+    public static void assertFalse(boolean value) {
+        assertFalse(value, "Expected value to be false");
+    }
+
+    /**
+     * Asserts that {@code value} is {@code false}.
+     *
+     * @param value The value assumed to be false.
+     * @param msg A description of the assumption.
+     * @throws RuntimeException if the assertion isn't valid.
+     */
+    public static void assertFalse(boolean value, String msg) {
+        assertTrue(!value, msg);
+    }
+
+    /**
+     * Calls {@link #assertTrue(boolean, String)} with a default message.
+     *
+     * @see #assertTrue(boolean, String)
+     */
+    public static void assertTrue(boolean value) {
+        assertTrue(value, "Expected value to be true");
+    }
+
+    /**
+     * Asserts that {@code value} is {@code true}.
+     *
+     * @param value The value assumed to be true.
+     * @param msg A description of the assumption.
+     * @throws RuntimeException if the assertion isn't valid.
+     */
+    public static void assertTrue(boolean value, String msg) {
+        if (!value) {
+            error(msg);
+        }
+    }
+
+    private static <T extends Comparable<T>> int compare(T lhs, T rhs, String msg) {
+        assertNotNull(lhs, msg);
+        assertNotNull(rhs, msg);
+        return lhs.compareTo(rhs);
+    }
+
+    private static String format(Object o) {
+        return o == null? "null" : o.toString();
+    }
+
+    private static void error(String msg) {
+        throw new RuntimeException(msg);
+    }
+
+}

hotspot/test/testlibrary/com/oracle/java/testlibrary/ByteCodeLoader.java

@@ -0,0 +1,74 @@
+/*
+ * Copyright (c) 2013, 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.
+ */
+
+package com.oracle.java.testlibrary;
+
+import java.security.SecureClassLoader;
+
+/**
+ * {@code ByteCodeLoader} can be used for easy loading of byte code already
+ * present in memory.
+ *
+ * {@code InMemoryCompiler} can be used for compiling source code in a string
+ * into byte code, which then can be loaded with {@code ByteCodeLoader}.
+ *
+ * @see InMemoryCompiler
+ */
+public class ByteCodeLoader extends SecureClassLoader {
+    private final String className;
+    private final byte[] byteCode;
+
+    /**
+     * Creates a new {@code ByteCodeLoader} ready to load a class with the
+     * given name and the given byte code.
+     *
+     * @param className The name of the class
+     * @param byteCode The byte code of the class
+     */
+    public ByteCodeLoader(String className, byte[] byteCode) {
+        this.className = className;
+        this.byteCode = byteCode;
+    }
+
+    @Override
+    protected Class<?> findClass(String name) throws ClassNotFoundException {
+        if (!name.equals(className)) {
+            throw new ClassNotFoundException(name);
+        }
+
+        return defineClass(name, byteCode, 0, byteCode.length);
+    }
+
+    /**
+     * Utility method for creating a new {@code ByteCodeLoader} and then
+     * directly load the given byte code.
+     *
+     * @param className The name of the class
+     * @param byteCode The byte code for the class
+     * @throws ClassNotFoundException if the class can't be loaded
+     * @return A {@see Class} object representing the class
+     */
+    public static Class<?> load(String className, byte[] byteCode) throws ClassNotFoundException {
+        return new ByteCodeLoader(className, byteCode).loadClass(className);
+    }
+}

hotspot/test/testlibrary/com/oracle/java/testlibrary/InMemoryJavaCompiler.java

@@ -0,0 +1,154 @@
+/*
+ * Copyright (c) 2013, 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.
+ */
+
+package com.oracle.java.testlibrary;
+
+import java.io.ByteArrayOutputStream;
+import java.io.IOException;
+import java.io.OutputStream;
+
+import java.net.URI;
+import java.util.Arrays;
+
+import javax.tools.ForwardingJavaFileManager;
+import javax.tools.ForwardingJavaFileManager;
+import javax.tools.FileObject;
+import javax.tools.JavaCompiler;
+import javax.tools.JavaCompiler.CompilationTask;
+import javax.tools.JavaFileManager;
+import javax.tools.JavaFileObject;
+import javax.tools.JavaFileObject.Kind;
+import javax.tools.SimpleJavaFileObject;
+import javax.tools.ToolProvider;
+
+/**
+ * {@code InMemoryJavaCompiler} can be used for compiling a {@link
+ * CharSequence} to a {@code byte[]}.
+ *
+ * The compiler will not use the file system at all, instead using a {@link
+ * ByteArrayOutputStream} for storing the byte code. For the source code, any
+ * kind of {@link CharSequence} can be used, e.g. {@link String}, {@link
+ * StringBuffer} or {@link StringBuilder}.
+ *
+ * The {@code InMemoryCompiler} can easily be used together with a {@code
+ * ByteClassLoader} to easily compile and load source code in a {@link String}:
+ *
+ * <pre>
+ * {@code
+ * import com.oracle.java.testlibrary.InMemoryJavaCompiler;
+ * import com.oracle.java.testlibrary.ByteClassLoader;
+ *
+ * class Example {
+ *     public static void main(String[] args) {
+ *         String className = "Foo";
+ *         String sourceCode = "public class " + className + " {" +
+ *                             "    public void bar() {" +
+ *                             "        System.out.println("Hello from bar!");" +
+ *                             "    }" +
+ *                             "}";
+ *         byte[] byteCode = InMemoryJavaCompiler.compile(className, sourceCode);
+ *         Class fooClass = ByteClassLoader.load(className, byteCode);
+ *     }
+ * }
+ * }
+ * </pre>
+ */
+public class InMemoryJavaCompiler {
+    private static class MemoryJavaFileObject extends SimpleJavaFileObject {
+        private final String className;
+        private final CharSequence sourceCode;
+        private final ByteArrayOutputStream byteCode;
+
+        public MemoryJavaFileObject(String className, CharSequence sourceCode) {
+            super(URI.create("string:///" + className.replace('.','/') + Kind.SOURCE.extension), Kind.SOURCE);
+            this.className = className;
+            this.sourceCode = sourceCode;
+            this.byteCode = new ByteArrayOutputStream();
+        }
+
+        @Override
+        public CharSequence getCharContent(boolean ignoreEncodingErrors) {
+            return sourceCode;
+        }
+
+        @Override
+        public OutputStream openOutputStream() throws IOException {
+            return byteCode;
+        }
+
+        public byte[] getByteCode() {
+            return byteCode.toByteArray();
+        }
+
+        public String getClassName() {
+            return className;
+        }
+    }
+
+    private static class FileManagerWrapper extends ForwardingJavaFileManager {
+        private MemoryJavaFileObject file;
+
+        public FileManagerWrapper(MemoryJavaFileObject file) {
+            super(getCompiler().getStandardFileManager(null, null, null));
+            this.file = file;
+        }
+
+        @Override
+        public JavaFileObject getJavaFileForOutput(Location location, String className,
+                                                   Kind kind, FileObject sibling)
+            throws IOException {
+            if (!file.getClassName().equals(className)) {
+                throw new IOException("Expected class with name " + file.getClassName() +
+                                      ", but got " + className);
+            }
+            return file;
+        }
+    }
+
+    /**
+     * Compiles the class with the given name and source code.
+     *
+     * @param className The name of the class
+     * @param sourceCode The source code for the class with name {@code className}
+     * @throws RuntimeException if the compilation did not succeed
+     * @return The resulting byte code from the compilation
+     */
+    public static byte[] compile(String className, CharSequence sourceCode) {
+        MemoryJavaFileObject file = new MemoryJavaFileObject(className, sourceCode);
+        CompilationTask task = getCompilationTask(file);
+
+        if(!task.call()) {
+            throw new RuntimeException("Could not compile " + className + " with source code " + sourceCode);
+        }
+
+        return file.getByteCode();
+    }
+
+    private static JavaCompiler getCompiler() {
+        return ToolProvider.getSystemJavaCompiler();
+    }
+
+    private static CompilationTask getCompilationTask(MemoryJavaFileObject file) {
+        return getCompiler().getTask(null, new FileManagerWrapper(file), null, null, null, Arrays.asList(file));
+    }
+}

hotspot/test/testlibrary/com/oracle/java/testlibrary/InputArguments.java

@@ -0,0 +1,51 @@
+/*
+ * Copyright (c) 2013, 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.
+ */
+
+package com.oracle.java.testlibrary;
+
+import java.lang.management.RuntimeMXBean;
+import java.lang.management.ManagementFactory;
+import java.util.List;
+
+/**
+ * This class provides access to the input arguments to the VM.
+ */
+public class InputArguments {
+    private static final List<String> args;
+
+    static {
+        RuntimeMXBean runtimeMxBean = ManagementFactory.getRuntimeMXBean();
+        args = runtimeMxBean.getInputArguments();
+    }
+
+    /**
+     * Returns true if {@code arg} is an input argument to the VM.
+     *
+     * @param arg The name of the argument.
+     * @return {@code true} if the given argument is an input argument,
+     *         otherwise {@code false}.
+     */
+    public static boolean contains(String arg) {
+        return args.contains(arg);
+    }
+}

hotspot/test/testlibrary/com/oracle/java/testlibrary/PerfCounter.java

@@ -0,0 +1,70 @@
+/*
+ * Copyright (c) 2013, 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.
+ */
+
+package com.oracle.java.testlibrary;
+
+import sun.jvmstat.monitor.Monitor;
+
+/**
+ * Represents a performance counter in the JVM.
+ *
+ * See http://openjdk.java.net/groups/hotspot/docs/Serviceability.html#bjvmstat
+ * for more details about performance counters.
+ */
+public class PerfCounter {
+    private final Monitor monitor;
+    private final String name;
+
+    PerfCounter(Monitor monitor, String name) {
+        this.monitor = monitor;
+        this.name = name;
+    }
+
+    /**
+     * Returns the value of this performance counter as a long.
+     *
+     * @return The long value of this performance counter
+     * @throws RuntimeException If the value of the performance counter isn't a long
+     */
+    public long longValue() {
+        Object value = monitor.getValue();
+        if (value instanceof Long) {
+            return ((Long) value).longValue();
+        }
+        throw new RuntimeException("Expected " + monitor.getName() + " to have a long value");
+    }
+
+    /**
+     * Returns the name of the performance counter.
+     *
+     * @return The name of the performance counter.
+     */
+    public String getName() {
+        return name;
+    }
+
+    @Override
+    public String toString() {
+        return name;
+    }
+}

hotspot/test/testlibrary/com/oracle/java/testlibrary/PerfCounters.java

@@ -0,0 +1,69 @@
+/*
+ * Copyright (c) 2013, 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.
+ */
+
+package com.oracle.java.testlibrary;
+
+import sun.jvmstat.monitor.Monitor;
+import sun.jvmstat.monitor.MonitorException;
+import sun.jvmstat.monitor.MonitoredHost;
+import sun.jvmstat.monitor.MonitoredVm;
+import sun.jvmstat.monitor.VmIdentifier;
+
+/**
+ * PerfCounters can be used to get a performance counter from the currently
+ * executing VM.
+ *
+ * Throws a runtime exception if an error occurs while communicating with the
+ * currently executing VM.
+ */
+public class PerfCounters {
+    private final static MonitoredVm vm;
+
+    static {
+        try {
+            String pid = Integer.toString(ProcessTools.getProcessId());
+            VmIdentifier vmId = new VmIdentifier(pid);
+            MonitoredHost host = MonitoredHost.getMonitoredHost(vmId);
+            vm = host.getMonitoredVm(vmId);
+        } catch (Exception e) {
+            throw new RuntimeException("Could not connect to the VM");
+        }
+    }
+
+    /**
+     * Returns the performance counter with the given name.
+     *
+     * @param name The name of the performance counter.
+     * @throws IllegalArgumentException If no counter with the given name exists.
+     * @throws MonitorException If an error occurs while communicating with the VM.
+     * @return The performance counter with the given name.
+     */
+    public static PerfCounter findByName(String name)
+        throws MonitorException, IllegalArgumentException {
+        Monitor m = vm.findByName(name);
+        if (m == null) {
+            throw new IllegalArgumentException("Did not find a performance counter with name " + name);
+        }
+        return new PerfCounter(m, name);
+    }
+}