8035946: Use ResourceHashtable for dependency checking

Use ResourceHashtable for dependency checking and delete GenericHashtable

Reviewed-by: kvn, coleenp

hotspot/src/share/vm/utilities/hashtable.hpp

@@ -327,86 +327,4 @@ public:
   }
 };
 
-
-/*
- * Usage of GenericHashtable:
- *
- * class X : public GenericHashtableEntry<X, ResourceObj> {
- *
- *   // Implement virtual functions in class X
- *   bool      equals(X* sig) const;
- *   uintptr_t hash()         const;
- * };
- *
- * void foo() {
- *   GenericHashtable<X, ResourceObj>* table = new GenericHashtable<X, ResourceObj>(11027, false);
- *
- *   X* elem = new X();
- *   table->add(elem);
- *   table->contains(elem);
- * }
- *
- * You can choose other allocation types as well. For example, to store the hashtable to a
- * particular region (CHeapObj<type>) simply replace ResourceObj with the desired type:
- *
- * class X : public GenericHashtableEntry<X, CHeapObj<mtCode> > { ... };
- *
- * To make the destructor (and remove) of the hashtable work:
- * 1) override the delete operator of X
- * 2) provide a destructor of the X
- *
- * You may also find it convenient to override the new operator.
- *
- * If you use this templates do not forget to add an explicit initialization
- * (at the end of hashtable.cpp).
- *
- *  template class GenericHashtable<X, ResourceObj>;
- */
-template <class T, class M> class GenericHashtableEntry : public M {
- private:
-  T* _next;
-  T* _prev;
- public:
-  // Must be implemented by subclass.
-  virtual uintptr_t key()            const = 0;
-  virtual bool      equals(T* other) const = 0;
-
-  T* next() const        { return _next; }
-  T* prev() const        { return _prev; }
-  void set_next(T* item) { _next = item; }
-  void set_prev(T* item) { _prev = item; }
-
-  // Constructor and destructor
-  GenericHashtableEntry() : _next(NULL), _prev(NULL) { };
-  virtual ~GenericHashtableEntry() {};
-};
-
-template <class T, class M> class GenericHashtable : public M {
- private:
-  T**      _items;
-  int      _size;
-  bool     _C_heap;
-  MEMFLAGS _memflag;
-
-  // Accessor methods
-  T*   head    (int idx) const    { return _items[idx]; }
-  void set_head(T* item, int idx) { _items[idx] = item; }
-  int  index   (T* item)          { assert(item != NULL, "missing null check"); return item->key() % size(); }
-
-  // Helper function
-  T* contains_impl(T* item, int idx);
-
-  DEBUG_ONLY(int _num_items;)
- public:
-  GenericHashtable(int size, bool C_heap = false, MEMFLAGS memflag = mtNone);
-  ~GenericHashtable();
-  T*   contains(T* match_item);
-  T*   remove  (T* match_item);
-  bool add     (T* item);
-
-
-  bool on_C_heap() const { return _C_heap; }
-  int  size()      const { return _size; }
-};
-
 #endif // SHARE_VM_UTILITIES_HASHTABLE_HPP