< prev index next >

src/hotspot/share/gc/g1/heapRegionType.hpp

Print this page
rev 51652 : Added support for eager mixed collection of evacuation failure regions
rev 52017 : All changes for G1 GC moved from 'combined' repo folder


  57   //
  58   // 01000 0 [16] Old Mask
  59   //
  60   // 10000 0 [32] Archive Mask
  61   // 11100 0 [56] Open Archive
  62   // 11100 1 [57] Closed Archive
  63   //
  64   typedef enum {
  65     FreeTag               = 0,
  66 
  67     YoungMask             = 2,
  68     EdenTag               = YoungMask,
  69     SurvTag               = YoungMask + 1,
  70 
  71     HumongousMask         = 4,
  72     PinnedMask            = 8,
  73     StartsHumongousTag    = HumongousMask | PinnedMask,
  74     ContinuesHumongousTag = HumongousMask | PinnedMask + 1,
  75 
  76     OldMask               = 16,

  77     OldTag                = OldMask,
  78 
  79     // Archive regions are regions with immutable content (i.e. not reclaimed, and
  80     // not allocated into during regular operation). They differ in the kind of references
  81     // allowed for the contained objects:
  82     // - Closed archive regions form a separate self-contained (closed) object graph
  83     // within the set of all of these regions. No references outside of closed
  84     // archive regions are allowed.
  85     // - Open archive regions have no restrictions on the references of their objects.
  86     // Objects within these regions are allowed to have references to objects
  87     // contained in any other kind of regions.
  88     ArchiveMask           = 32,
  89     OpenArchiveTag        = ArchiveMask | PinnedMask,
  90     ClosedArchiveTag      = ArchiveMask | PinnedMask + 1
  91   } Tag;
  92 
  93   volatile Tag _tag;
  94 
  95   static bool is_valid(Tag tag);
  96 
  97   Tag get() const {
  98     hrt_assert_is_valid(_tag);


 120 public:
 121   // Queries
 122 
 123   bool is_free() const { return get() == FreeTag; }
 124 
 125   bool is_young()    const { return (get() & YoungMask) != 0; }
 126   bool is_eden()     const { return get() == EdenTag;  }
 127   bool is_survivor() const { return get() == SurvTag;  }
 128 
 129   bool is_humongous()           const { return (get() & HumongousMask) != 0;   }
 130   bool is_starts_humongous()    const { return get() == StartsHumongousTag;    }
 131   bool is_continues_humongous() const { return get() == ContinuesHumongousTag; }
 132 
 133   bool is_archive()        const { return (get() & ArchiveMask) != 0; }
 134   bool is_open_archive()   const { return get() == OpenArchiveTag; }
 135   bool is_closed_archive() const { return get() == ClosedArchiveTag; }
 136 
 137   // is_old regions may or may not also be pinned
 138   bool is_old() const { return (get() & OldMask) != 0; }
 139 


 140   bool is_old_or_humongous() const { return (get() & (OldMask | HumongousMask)) != 0; }
 141 
 142   bool is_old_or_humongous_or_archive() const { return (get() & (OldMask | HumongousMask | ArchiveMask)) != 0; }
 143 
 144   // is_pinned regions may be archive or humongous
 145   bool is_pinned() const { return (get() & PinnedMask) != 0; }
 146 
 147   // Setters
 148 
 149   void set_free() { set(FreeTag); }
 150 
 151   void set_eden()        { set_from(EdenTag, FreeTag); }
 152   void set_eden_pre_gc() { set_from(EdenTag, SurvTag); }
 153   void set_survivor()    { set_from(SurvTag, FreeTag); }
 154 
 155   void set_starts_humongous()    { set_from(StartsHumongousTag,    FreeTag); }
 156   void set_continues_humongous() { set_from(ContinuesHumongousTag, FreeTag); }
 157 
 158   void set_old() { set(OldTag); }


 159 
 160   // Change the current region type to be of an old region type if not already done so.
 161   // Returns whether the region type has been changed or not.
 162   bool relabel_as_old() {
 163     //assert(!is_free(), "Should not try to move Free region");
 164     assert(!is_humongous(), "Should not try to move Humongous region");
 165     if (is_old()) {
 166       return false;
 167     }
 168     if (is_eden()) {
 169       set_from(OldTag, EdenTag);
 170       return true;
 171     } else if (is_free()) {
 172       set_from(OldTag, FreeTag);
 173       return true;
 174     } else {
 175       set_from(OldTag, SurvTag);
 176       return true;
 177     }
 178   }


  57   //
  58   // 01000 0 [16] Old Mask
  59   //
  60   // 10000 0 [32] Archive Mask
  61   // 11100 0 [56] Open Archive
  62   // 11100 1 [57] Closed Archive
  63   //
  64   typedef enum {
  65     FreeTag               = 0,
  66 
  67     YoungMask             = 2,
  68     EdenTag               = YoungMask,
  69     SurvTag               = YoungMask + 1,
  70 
  71     HumongousMask         = 4,
  72     PinnedMask            = 8,
  73     StartsHumongousTag    = HumongousMask | PinnedMask,
  74     ContinuesHumongousTag = HumongousMask | PinnedMask + 1,
  75 
  76     OldMask               = 16,
  77     PreMatureOldMask      = OldMask + 1,
  78     OldTag                = OldMask,
  79     PreMatureOldTag       = PreMatureOldMask,
  80     // Archive regions are regions with immutable content (i.e. not reclaimed, and
  81     // not allocated into during regular operation). They differ in the kind of references
  82     // allowed for the contained objects:
  83     // - Closed archive regions form a separate self-contained (closed) object graph
  84     // within the set of all of these regions. No references outside of closed
  85     // archive regions are allowed.
  86     // - Open archive regions have no restrictions on the references of their objects.
  87     // Objects within these regions are allowed to have references to objects
  88     // contained in any other kind of regions.
  89     ArchiveMask           = 32,
  90     OpenArchiveTag        = ArchiveMask | PinnedMask,
  91     ClosedArchiveTag      = ArchiveMask | PinnedMask + 1
  92   } Tag;
  93 
  94   volatile Tag _tag;
  95 
  96   static bool is_valid(Tag tag);
  97 
  98   Tag get() const {
  99     hrt_assert_is_valid(_tag);


 121 public:
 122   // Queries
 123 
 124   bool is_free() const { return get() == FreeTag; }
 125 
 126   bool is_young()    const { return (get() & YoungMask) != 0; }
 127   bool is_eden()     const { return get() == EdenTag;  }
 128   bool is_survivor() const { return get() == SurvTag;  }
 129 
 130   bool is_humongous()           const { return (get() & HumongousMask) != 0;   }
 131   bool is_starts_humongous()    const { return get() == StartsHumongousTag;    }
 132   bool is_continues_humongous() const { return get() == ContinuesHumongousTag; }
 133 
 134   bool is_archive()        const { return (get() & ArchiveMask) != 0; }
 135   bool is_open_archive()   const { return get() == OpenArchiveTag; }
 136   bool is_closed_archive() const { return get() == ClosedArchiveTag; }
 137 
 138   // is_old regions may or may not also be pinned
 139   bool is_old() const { return (get() & OldMask) != 0; }
 140 
 141   bool is_premature_old() const { return get() == PreMatureOldTag; }
 142 
 143   bool is_old_or_humongous() const { return (get() & (OldMask | HumongousMask)) != 0; }
 144 
 145   bool is_old_or_humongous_or_archive() const { return (get() & (OldMask | HumongousMask | ArchiveMask)) != 0; }
 146 
 147   // is_pinned regions may be archive or humongous
 148   bool is_pinned() const { return (get() & PinnedMask) != 0; }
 149 
 150   // Setters
 151 
 152   void set_free() { set(FreeTag); }
 153 
 154   void set_eden()        { set_from(EdenTag, FreeTag); }
 155   void set_eden_pre_gc() { set_from(EdenTag, SurvTag); }
 156   void set_survivor()    { set_from(SurvTag, FreeTag); }
 157 
 158   void set_starts_humongous()    { set_from(StartsHumongousTag,    FreeTag); }
 159   void set_continues_humongous() { set_from(ContinuesHumongousTag, FreeTag); }
 160 
 161   void set_old() { set(OldTag); }
 162 
 163   void set_premature_old() { set(PreMatureOldTag); }
 164 
 165   // Change the current region type to be of an old region type if not already done so.
 166   // Returns whether the region type has been changed or not.
 167   bool relabel_as_old() {
 168     //assert(!is_free(), "Should not try to move Free region");
 169     assert(!is_humongous(), "Should not try to move Humongous region");
 170     if (is_old()) {
 171       return false;
 172     }
 173     if (is_eden()) {
 174       set_from(OldTag, EdenTag);
 175       return true;
 176     } else if (is_free()) {
 177       set_from(OldTag, FreeTag);
 178       return true;
 179     } else {
 180       set_from(OldTag, SurvTag);
 181       return true;
 182     }
 183   }
< prev index next >