src/share/vm/gc_implementation/g1/g1MarkSweep.cpp

rev 6673 : 8048112: G1 Full GC needs to support the case when the very first region is not available
Summary: To allow uncommit of regions within the heap, G1 Full GC should correctly handle the case when the very first region is not available (uncommitted). Provide support for that by lazily initializing the compaction point during iteration of the list of heap regions. Further refactor the code to let the G1CollectedHeap handle finding the next region to compact into.
Reviewed-by:
rev 6674 : imported patch fixes-kim

*** 235,245 ****
  
  public:
    G1PrepareCompactClosure()
    : _g1h(G1CollectedHeap::heap()),
      _mrbs(_g1h->g1_barrier_set()),
!     _cp(),
      _humongous_regions_removed() { }
  
    void update_sets() {
      // We'll recalculate total used bytes and recreate the free list
      // at the end of the GC, so no point in updating those values here.
--- 235,245 ----
  
  public:
    G1PrepareCompactClosure()
    : _g1h(G1CollectedHeap::heap()),
      _mrbs(_g1h->g1_barrier_set()),
!     _cp(NULL),
      _humongous_regions_removed() { }
  
    void update_sets() {
      // We'll recalculate total used bytes and recreate the free list
      // at the end of the GC, so no point in updating those values here.