src/hotspot/share/oops/access.hpp

rev 49275 : [mq]: JDK-8199781.patch

*** 54,64 ****
  // * atomic_xchg: Atomically swap a new value at an address if previous value matched the compared value.
  // * atomic_xchg_at: Atomically swap a new value at an internal pointer address if previous value matched the compared value.
  // * arraycopy: Copy data from one heap array to another heap array.
  // * clone: Clone the contents of an object to a newly allocated object.
  // * resolve: Resolve a stable to-space invariant oop that is guaranteed not to relocate its payload until a subsequent thread transition.
! 
  typedef uint64_t DecoratorSet;
  
  // == Internal Decorators - do not use ==
  // * INTERNAL_EMPTY: This is the name for the empty decorator set (in absence of other decorators).
  // * INTERNAL_CONVERT_COMPRESSED_OOPS: This is an oop access that will require converting an oop
--- 54,64 ----
  // * atomic_xchg: Atomically swap a new value at an address if previous value matched the compared value.
  // * atomic_xchg_at: Atomically swap a new value at an internal pointer address if previous value matched the compared value.
  // * arraycopy: Copy data from one heap array to another heap array.
  // * clone: Clone the contents of an object to a newly allocated object.
  // * resolve: Resolve a stable to-space invariant oop that is guaranteed not to relocate its payload until a subsequent thread transition.
! // * equals: Object equality, e.g. when different copies of the same objects are in use (from-space vs. to-space)
  typedef uint64_t DecoratorSet;
  
  // == Internal Decorators - do not use ==
  // * INTERNAL_EMPTY: This is the name for the empty decorator set (in absence of other decorators).
  // * INTERNAL_CONVERT_COMPRESSED_OOPS: This is an oop access that will require converting an oop
*** 302,311 ****
--- 302,314 ----
    void clone(oop src, oop dst, size_t size);
  
    template <DecoratorSet decorators>
    oop resolve(oop src);
  
+   template <DecoratorSet decorators>
+   bool equals(oop o1, oop o2);
+ 
    // Infer the type that should be returned from a load.
    template <typename P, DecoratorSet decorators>
    class LoadProxy: public StackObj {
    private:
      P *const _addr;
*** 510,519 ****
--- 513,527 ----
  
    static oop resolve(oop obj) {
      verify_decorators<INTERNAL_EMPTY>();
      return AccessInternal::resolve<decorators>(obj);
    }
+ 
+   static bool equals(oop o1, oop o2) {
+     verify_decorators<INTERNAL_EMPTY>();
+     return AccessInternal::equals<decorators>(o1, o2);
+   }
  };
  
  // Helper for performing raw accesses (knows only of memory ordering
  // atomicity decorators as well as compressed oops)
  template <DecoratorSet decorators = INTERNAL_EMPTY>