--- old/src/share/vm/oops/method.hpp	2015-11-23 18:21:00.048836664 +0100
+++ new/src/share/vm/oops/method.hpp	2015-11-23 18:20:59.871818865 +0100
@@ -75,16 +75,17 @@
 
   // Flags
   enum Flags {
-    _jfr_towrite          = 1 << 0,
-    _caller_sensitive     = 1 << 1,
-    _force_inline         = 1 << 2,
-    _dont_inline          = 1 << 3,
-    _hidden               = 1 << 4,
-    _has_injected_profile = 1 << 5,
-    _running_emcp         = 1 << 6,
-    _intrinsic_candidate  = 1 << 7
+    _jfr_towrite           = 1 << 0,
+    _caller_sensitive      = 1 << 1,
+    _force_inline          = 1 << 2,
+    _dont_inline           = 1 << 3,
+    _hidden                = 1 << 4,
+    _has_injected_profile  = 1 << 5,
+    _running_emcp          = 1 << 6,
+    _intrinsic_candidate   = 1 << 7,
+    _reserved_stack_access = 1 << 8
   };
-  u1 _flags;
+  u2 _flags;
 
 #ifndef PRODUCT
   int               _compiled_invocation_count;  // Number of nmethod invocations so far (for perf. debugging)
@@ -829,6 +830,14 @@
     _flags = x ? (_flags | _has_injected_profile) : (_flags & ~_has_injected_profile);
   }
 
+  bool has_reserved_stack_access() {
+      return (_flags & _reserved_stack_access) != 0;
+  }
+  
+  void set_has_reserved_stack_access(bool x) {
+    _flags = x ? (_flags | _reserved_stack_access) : (_flags & ~_reserved_stack_access);
+  }
+ 
   ConstMethod::MethodType method_type() const {
       return _constMethod->method_type();
   }