30 #include "gc/g1/heapRegionType.hpp"
  31 #include "gc/g1/survRateGroup.hpp"
  32 #include "gc/shared/ageTable.hpp"
  33 #include "gc/shared/spaceDecorator.hpp"
  34 #include "utilities/macros.hpp"
  35 
  36 // A HeapRegion is the smallest piece of a G1CollectedHeap that
  37 // can be collected independently.
  38 
  39 // NOTE: Although a HeapRegion is a Space, its
  40 // Space::initDirtyCardClosure method must not be called.
  41 // The problem is that the existence of this method breaks
  42 // the independence of barrier sets from remembered sets.
  43 // The solution is to remove this method from the definition
  44 // of a Space.
  45 
  46 // Each heap region is self contained. top() and end() can never
  47 // be set beyond the end of the region. For humongous objects,
  48 // the first region is a StartsHumongous region. If the humongous
  49 // object is larger than a heap region, the following regions will
  50 // be of type ContinuesHumongous. In this case the top() and end()
  51 // of the StartHumongous region will point to the end of that region.
  52 // The same will be true for all ContinuesHumongous regions except
  53 // the last, which will have its' top() at the objects' top.
  54 
  55 class G1CollectedHeap;
  56 class HeapRegionRemSet;
  57 class HeapRegionRemSetIterator;
  58 class HeapRegion;
  59 class HeapRegionSetBase;
  60 class nmethod;
  61 
  62 #define HR_FORMAT "%u:(%s)[" PTR_FORMAT "," PTR_FORMAT "," PTR_FORMAT "]"
  63 #define HR_FORMAT_PARAMS(_hr_) \
  64                 (_hr_)->hrm_index(), \
  65                 (_hr_)->get_short_type_str(), \
  66                 p2i((_hr_)->bottom()), p2i((_hr_)->top()), p2i((_hr_)->end())
  67 
  68 // sentinel value for hrm_index
  69 #define G1_NO_HRM_INDEX ((uint) -1)
  70 
  71 // A dirty card to oop closure for heap regions. It
  72 // knows how to get the G1 heap and how to use the bitmap
  73 // in the concurrent marker used by G1 to filter remembered

  30 #include "gc/g1/heapRegionType.hpp"
  31 #include "gc/g1/survRateGroup.hpp"
  32 #include "gc/shared/ageTable.hpp"
  33 #include "gc/shared/spaceDecorator.hpp"
  34 #include "utilities/macros.hpp"
  35 
  36 // A HeapRegion is the smallest piece of a G1CollectedHeap that
  37 // can be collected independently.
  38 
  39 // NOTE: Although a HeapRegion is a Space, its
  40 // Space::initDirtyCardClosure method must not be called.
  41 // The problem is that the existence of this method breaks
  42 // the independence of barrier sets from remembered sets.
  43 // The solution is to remove this method from the definition
  44 // of a Space.
  45 
  46 // Each heap region is self contained. top() and end() can never
  47 // be set beyond the end of the region. For humongous objects,
  48 // the first region is a StartsHumongous region. If the humongous
  49 // object is larger than a heap region, the following regions will
  50 // be of type ContinuesHumongous. In this case the top() of the
  51 // StartHumongous region and all ContinuesHumongous regions except
  52 // the last will point to their own end. For the last ContinuesHumongous
  53 // region, top() will equal the object's top.
  54 
  55 class G1CollectedHeap;
  56 class HeapRegionRemSet;
  57 class HeapRegionRemSetIterator;
  58 class HeapRegion;
  59 class HeapRegionSetBase;
  60 class nmethod;
  61 
  62 #define HR_FORMAT "%u:(%s)[" PTR_FORMAT "," PTR_FORMAT "," PTR_FORMAT "]"
  63 #define HR_FORMAT_PARAMS(_hr_) \
  64                 (_hr_)->hrm_index(), \
  65                 (_hr_)->get_short_type_str(), \
  66                 p2i((_hr_)->bottom()), p2i((_hr_)->top()), p2i((_hr_)->end())
  67 
  68 // sentinel value for hrm_index
  69 #define G1_NO_HRM_INDEX ((uint) -1)
  70 
  71 // A dirty card to oop closure for heap regions. It
  72 // knows how to get the G1 heap and how to use the bitmap
  73 // in the concurrent marker used by G1 to filter remembered