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src/share/vm/gc_implementation/g1/heapRegionType.hpp

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   9  * This code is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * version 2 for more details (a copy is included in the LICENSE file that
  13  * accompanied this code).
  14  *
  15  * You should have received a copy of the GNU General Public License version
  16  * 2 along with this work; if not, write to the Free Software Foundation,
  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
  19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
  21  * questions.
  22  *
  23  */
  24 
  25 #ifndef SHARE_VM_GC_IMPLEMENTATION_G1_HEAPREGIONTYPE_HPP
  26 #define SHARE_VM_GC_IMPLEMENTATION_G1_HEAPREGIONTYPE_HPP
  27 
  28 #include "memory/allocation.hpp"

  29 
  30 #define hrt_assert_is_valid(tag) \
  31   assert(is_valid((tag)), err_msg("invalid HR type: %u", (uint) (tag)))
  32 
  33 class HeapRegionType VALUE_OBJ_CLASS_SPEC {
  34 private:
  35   // We encode the value of the heap region type so the generation can be
  36   // determined quickly. The tag is split into two parts:
  37   //
  38   //   major type (young, humongous)                         : top N-1 bits
  39   //   minor type (eden / survivor, starts / cont hum, etc.) : bottom 1 bit
  40   //
  41   // If there's need to increase the number of minor types in the
  42   // future, we'll have to increase the size of the latter and hence
  43   // decrease the size of the former.
  44   //
  45   // 0000 0 [ 0] Free
  46   //
  47   // 0001 0      Young Mask
  48   // 0001 0 [ 2] Eden


 110 
 111   bool is_old() const { return get() == OldTag; }
 112 
 113   // Setters
 114 
 115   void set_free() { set(FreeTag); }
 116 
 117   void set_eden()        { set_from(EdenTag, FreeTag); }
 118   void set_eden_pre_gc() { set_from(EdenTag, SurvTag); }
 119   void set_survivor()    { set_from(SurvTag, FreeTag); }
 120 
 121   void set_starts_humongous()    { set_from(HumStartsTag, FreeTag); }
 122   void set_continues_humongous() { set_from(HumContTag,   FreeTag); }
 123 
 124   void set_old() { set(OldTag); }
 125 
 126   // Misc
 127 
 128   const char* get_str() const;
 129   const char* get_short_str() const;

 130 
 131   HeapRegionType() : _tag(FreeTag) { hrt_assert_is_valid(_tag); }
 132 };
 133 
 134 #endif // SHARE_VM_GC_IMPLEMENTATION_G1_HEAPREGIONTYPE_HPP


   9  * This code is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * version 2 for more details (a copy is included in the LICENSE file that
  13  * accompanied this code).
  14  *
  15  * You should have received a copy of the GNU General Public License version
  16  * 2 along with this work; if not, write to the Free Software Foundation,
  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
  19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
  21  * questions.
  22  *
  23  */
  24 
  25 #ifndef SHARE_VM_GC_IMPLEMENTATION_G1_HEAPREGIONTYPE_HPP
  26 #define SHARE_VM_GC_IMPLEMENTATION_G1_HEAPREGIONTYPE_HPP
  27 
  28 #include "memory/allocation.hpp"
  29 #include "gc_implementation/g1/g1HeapRegionTraceType.hpp"
  30 
  31 #define hrt_assert_is_valid(tag) \
  32   assert(is_valid((tag)), err_msg("invalid HR type: %u", (uint) (tag)))
  33 
  34 class HeapRegionType VALUE_OBJ_CLASS_SPEC {
  35 private:
  36   // We encode the value of the heap region type so the generation can be
  37   // determined quickly. The tag is split into two parts:
  38   //
  39   //   major type (young, humongous)                         : top N-1 bits
  40   //   minor type (eden / survivor, starts / cont hum, etc.) : bottom 1 bit
  41   //
  42   // If there's need to increase the number of minor types in the
  43   // future, we'll have to increase the size of the latter and hence
  44   // decrease the size of the former.
  45   //
  46   // 0000 0 [ 0] Free
  47   //
  48   // 0001 0      Young Mask
  49   // 0001 0 [ 2] Eden


 111 
 112   bool is_old() const { return get() == OldTag; }
 113 
 114   // Setters
 115 
 116   void set_free() { set(FreeTag); }
 117 
 118   void set_eden()        { set_from(EdenTag, FreeTag); }
 119   void set_eden_pre_gc() { set_from(EdenTag, SurvTag); }
 120   void set_survivor()    { set_from(SurvTag, FreeTag); }
 121 
 122   void set_starts_humongous()    { set_from(HumStartsTag, FreeTag); }
 123   void set_continues_humongous() { set_from(HumContTag,   FreeTag); }
 124 
 125   void set_old() { set(OldTag); }
 126 
 127   // Misc
 128 
 129   const char* get_str() const;
 130   const char* get_short_str() const;
 131   G1HeapRegionTraceType::Type get_trace_type();
 132 
 133   HeapRegionType() : _tag(FreeTag) { hrt_assert_is_valid(_tag); }
 134 };
 135 
 136 #endif // SHARE_VM_GC_IMPLEMENTATION_G1_HEAPREGIONTYPE_HPP
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