src/hotspot/share/gc/shenandoah/shenandoahHeap.hpp

rev 54386 : 8221766: Load-reference barriers for Shenandoah

*** 268,287 ****
  // Important invariant: when GC state is zero, the heap is stable, and no barriers
  // are required.
  //
  public:
    enum GCStateBitPos {
!     // Heap has forwarded objects: need RB, ACMP, CAS barriers.
      HAS_FORWARDED_BITPOS   = 0,
  
      // Heap is under marking: needs SATB barriers.
      MARKING_BITPOS    = 1,
  
!     // Heap is under evacuation: needs WB barriers. (Set together with UNSTABLE)
      EVACUATION_BITPOS = 2,
  
!     // Heap is under updating: needs SVRB/SVWB barriers.
      UPDATEREFS_BITPOS = 3,
  
      // Heap is under traversal collection
      TRAVERSAL_BITPOS  = 4,
    };
--- 268,287 ----
  // Important invariant: when GC state is zero, the heap is stable, and no barriers
  // are required.
  //
  public:
    enum GCStateBitPos {
!     // Heap has forwarded objects: needs LRB barriers.
      HAS_FORWARDED_BITPOS   = 0,
  
      // Heap is under marking: needs SATB barriers.
      MARKING_BITPOS    = 1,
  
!     // Heap is under evacuation: needs LRB barriers. (Set together with HAS_FORWARDED)
      EVACUATION_BITPOS = 2,
  
!     // Heap is under updating: needs no additional barriers.
      UPDATEREFS_BITPOS = 3,
  
      // Heap is under traversal collection
      TRAVERSAL_BITPOS  = 4,
    };