--- a/src/share/vm/oops/method.hpp	Tue Apr 07 11:20:51 2015 +0200
+++ b/src/share/vm/oops/method.hpp	Tue Apr 07 14:58:49 2015 +0200
@@ -237,10 +237,11 @@
   // Tracking number of breakpoints, for fullspeed debugging.
   // Only mutated by VM thread.
   u2   number_of_breakpoints()             const {
-    if (method_counters() == NULL) {
+    MethodCounters* mcs = method_counters();
+    if (mcs == NULL) {
       return 0;
     } else {
-      return method_counters()->number_of_breakpoints();
+      return mcs->number_of_breakpoints();
     }
   }
   void incr_number_of_breakpoints(TRAPS)         {
@@ -257,8 +258,9 @@
   }
   // Initialization only
   void clear_number_of_breakpoints()             {
-    if (method_counters() != NULL) {
-      method_counters()->clear_number_of_breakpoints();
+    MethodCounters* mcs = method_counters();
+    if (mcs != NULL) {
+      mcs->clear_number_of_breakpoints();
     }
   }
 
@@ -305,10 +307,11 @@
   }
 
   int  interpreter_throwout_count() const        {
-    if (method_counters() == NULL) {
+    MethodCounters* mcs = method_counters();
+    if (mcs == NULL) {
       return 0;
     } else {
-      return method_counters()->interpreter_throwout_count();
+      return mcs->interpreter_throwout_count();
     }
   }
 
@@ -366,11 +369,13 @@
     return _method_counters;
   }
 
-  void set_method_counters(MethodCounters* counters) {
-    // The store into method must be released. On platforms without
-    // total store order (TSO) the reference may become visible before
-    // the initialization of data otherwise.
-    OrderAccess::release_store_ptr((volatile void *)&_method_counters, counters);
+  void clear_method_counters() {
+    _method_counters = NULL;
+  }
+
+  bool init_method_counters(MethodCounters* counters) {
+    // Try to install a pointer to MethodCounters, return true on success.
+    return Atomic::cmpxchg_ptr(counters, (volatile void*)&_method_counters, NULL) == NULL;
   }
 
 #ifdef TIERED
@@ -383,26 +388,28 @@
       return method_counters()->interpreter_invocation_count();
     }
   }
-  void set_prev_event_count(int count, TRAPS)    {
-    MethodCounters* mcs = get_method_counters(CHECK);
+  void set_prev_event_count(int count) {
+    MethodCounters* mcs = method_counters();
     if (mcs != NULL) {
       mcs->set_interpreter_invocation_count(count);
     }
   }
   jlong prev_time() const                        {
-    return method_counters() == NULL ? 0 : method_counters()->prev_time();
+    MethodCounters* mcs = method_counters();
+    return mcs == NULL ? 0 : mcs->prev_time();
   }
-  void set_prev_time(jlong time, TRAPS)          {
-    MethodCounters* mcs = get_method_counters(CHECK);
+  void set_prev_time(jlong time) {
+    MethodCounters* mcs = method_counters();
     if (mcs != NULL) {
       mcs->set_prev_time(time);
     }
   }
   float rate() const                             {
-    return method_counters() == NULL ? 0 : method_counters()->rate();
+    MethodCounters* mcs = method_counters();
+    return mcs == NULL ? 0 : mcs->rate();
   }
-  void set_rate(float rate, TRAPS) {
-    MethodCounters* mcs = get_method_counters(CHECK);
+  void set_rate(float rate) {
+    MethodCounters* mcs = method_counters();
     if (mcs != NULL) {
       mcs->set_rate(rate);
     }
@@ -420,9 +427,12 @@
   static MethodCounters* build_method_counters(Method* m, TRAPS);
 
   int interpreter_invocation_count() {
-    if (TieredCompilation) return invocation_count();
-    else return (method_counters() == NULL) ? 0 :
-                 method_counters()->interpreter_invocation_count();
+    if (TieredCompilation) {
+      return invocation_count();
+    } else {
+      MethodCounters* mcs = method_counters();
+      return (mcs == NULL) ? 0 : mcs->interpreter_invocation_count();
+    }
   }
   int increment_interpreter_invocation_count(TRAPS) {
     if (TieredCompilation) ShouldNotReachHere();
@@ -613,6 +623,9 @@
   // returns true if the method is an accessor function (setter/getter).
   bool is_accessor() const;
 
+  // returns true if the method does nothing but return a constant of primitive type
+  bool is_constant_getter() const;
+
   // returns true if the method is an initializer (<init> or <clinit>).
   bool is_initializer() const;
 
@@ -812,6 +825,10 @@
    return method_holder()->lookup_osr_nmethod(this, InvocationEntryBci, level, match_level) != NULL;
   }
 
+  int mark_osr_nmethods() {
+    return method_holder()->mark_osr_nmethods(this);
+  }
+
   nmethod* lookup_osr_nmethod_for(int bci, int level, bool match_level) {
     return method_holder()->lookup_osr_nmethod(this, bci, level, match_level);
   }