--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/hotspot/src/share/vm/oops/methodCounters.hpp	Tue Apr 09 17:17:41 2013 -0400
@@ -0,0 +1,124 @@
+/*
+ * 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.
+ *
+ */
+
+#ifndef SHARE_VM_OOPS_METHODCOUNTERS_HPP
+#define SHARE_VM_OOPS_METHODCOUNTERS_HPP
+
+#include "oops/metadata.hpp"
+#include "interpreter/invocationCounter.hpp"
+
+class MethodCounters: public MetaspaceObj {
+ friend class VMStructs;
+ private:
+  int               _interpreter_invocation_count; // Count of times invoked (reused as prev_event_count in tiered)
+  u2                _interpreter_throwout_count; // Count of times method was exited via exception while interpreting
+  u2                _number_of_breakpoints;      // fullspeed debugging support
+  InvocationCounter _invocation_counter;         // Incremented before each activation of the method - used to trigger frequency-based optimizations
+  InvocationCounter _backedge_counter;           // Incremented before each backedge taken - used to trigger frequencey-based optimizations
+
+#ifdef TIERED
+  float             _rate;                        // Events (invocation and backedge counter increments) per millisecond
+  jlong             _prev_time;                   // Previous time the rate was acquired
+#endif
+
+  MethodCounters() : _interpreter_invocation_count(0),
+                     _interpreter_throwout_count(0),
+                     _number_of_breakpoints(0)
+#ifdef TIERED
+                   , _rate(0),
+                     _prev_time(0)
+#endif
+  {
+    invocation_counter()->init();
+    backedge_counter()->init();
+  }
+
+ public:
+  static MethodCounters* allocate(ClassLoaderData* loader_data, TRAPS);
+
+  void deallocate_contents(ClassLoaderData* loader_data) {}
+  DEBUG_ONLY(bool on_stack() { return false; })  // for template
+
+  static int size() { return sizeof(MethodCounters) / wordSize; }
+
+  bool is_klass() const { return false; }
+
+  void clear_counters();
+
+  int interpreter_invocation_count() {
+    return _interpreter_invocation_count;
+  }
+  void set_interpreter_invocation_count(int count) {
+    _interpreter_invocation_count = count;
+  }
+  int increment_interpreter_invocation_count() {
+    return ++_interpreter_invocation_count;
+  }
+
+  void interpreter_throwout_increment() {
+    if (_interpreter_throwout_count < 65534) {
+      _interpreter_throwout_count++;
+    }
+  }
+  int  interpreter_throwout_count() const {
+    return _interpreter_throwout_count;
+  }
+  void set_interpreter_throwout_count(int count) {
+    _interpreter_throwout_count = count;
+  }
+
+  u2   number_of_breakpoints() const   { return _number_of_breakpoints; }
+  void incr_number_of_breakpoints()    { ++_number_of_breakpoints; }
+  void decr_number_of_breakpoints()    { --_number_of_breakpoints; }
+  void clear_number_of_breakpoints()   { _number_of_breakpoints = 0; }
+
+#ifdef TIERED
+  jlong prev_time() const                        { return _prev_time; }
+  void set_prev_time(jlong time)                 { _prev_time = time; }
+  float rate() const                             { return _rate; }
+  void set_rate(float rate)                      { _rate = rate; }
+#endif
+
+  // invocation counter
+  InvocationCounter* invocation_counter() { return &_invocation_counter; }
+  InvocationCounter* backedge_counter()   { return &_backedge_counter; }
+
+  static ByteSize interpreter_invocation_counter_offset() {
+    return byte_offset_of(MethodCounters, _interpreter_invocation_count);
+  }
+
+  static ByteSize invocation_counter_offset()    {
+    return byte_offset_of(MethodCounters, _invocation_counter);
+  }
+
+  static ByteSize backedge_counter_offset()      {
+    return byte_offset_of(MethodCounters, _backedge_counter);
+  }
+
+  static int interpreter_invocation_counter_offset_in_bytes() {
+    return offset_of(MethodCounters, _interpreter_invocation_count);
+  }
+
+};
+#endif //SHARE_VM_OOPS_METHODCOUNTERS_HPP