src/hotspot/share/oops/instanceKlass.hpp

 class DependencyContext;
 class fieldDescriptor;
 class jniIdMapBase;
 class JNIid;
 class JvmtiCachedClassFieldMap;
+class nmethodBucket;
 class SuperTypeClosure;
 
 // This is used in iterators below.
 class FieldClosure: public StackObj {
 public:

@@ -247,11 +248,12
   u2              _major_version;        // major version number of class file
   Thread*         _init_thread;          // Pointer to current thread doing initialization (to handle recusive initialization)
   OopMapCache*    volatile _oop_map_cache;   // OopMapCache for all methods in the klass (allocated lazily)
   JNIid*          _jni_ids;              // First JNI identifier for static fields in this class
   jmethodID*      volatile _methods_jmethod_ids;  // jmethodIDs corresponding to method_idnum, or NULL if none
-  intptr_t        _dep_context;          // packed DependencyContext structure
+  nmethodBucket*  volatile _dep_context;          // packed DependencyContext structure
+  uint64_t        volatile _dep_context_last_cleaned;
   nmethod*        _osr_nmethods_head;    // Head of list of on-stack replacement nmethods for this class
 #if INCLUDE_JVMTI
   BreakpointInfo* _breakpoints;          // bpt lists, managed by Method*
   // Linked instanceKlasses of previous versions
   InstanceKlass* _previous_versions;

@@ -974,11 +976,12
 
   // maintenance of deoptimization dependencies
   inline DependencyContext dependencies();
   int  mark_dependent_nmethods(KlassDepChange& changes);
   void add_dependent_nmethod(nmethod* nm);
-  void remove_dependent_nmethod(nmethod* nm, bool delete_immediately);
+  void remove_dependent_nmethod(nmethod* nm);
+  void clean_dependency_context();
 
   // On-stack replacement support
   nmethod* osr_nmethods_head() const         { return _osr_nmethods_head; };
   void set_osr_nmethods_head(nmethod* h)     { _osr_nmethods_head = h; };
   void add_osr_nmethod(nmethod* n);