jdk8-mips64-public/hotspot: src/share/vm/gc_implementation/g1/heapRegionType.hpp@c2844108a708 (annotated)

src/share/vm/gc_implementation/g1/heapRegionType.hpp@c2844108a708 (annotated)

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

Thu, 23 Oct 2014 12:02:08 -0700

author: asaha
date: Thu, 23 Oct 2014 12:02:08 -0700
changeset 7476: c2844108a708
parent 7195: c02ec279b062
child 9861: a248d0be1309
permissions: -rw-r--r--

Merge

 /*
  * Copyright (c) 2014, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
  * under the terms of the GNU General Public License version 2 only, as
  * published by the Free Software Foundation.
  *
  * This code is distributed in the hope that it will be useful, but WITHOUT
  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  * version 2 for more details (a copy is included in the LICENSE file that
  * accompanied this code).
  *
  * You should have received a copy of the GNU General Public License version
  * 2 along with this work; if not, write to the Free Software Foundation,
  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  *
  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  * or visit www.oracle.com if you need additional information or have any
  * questions.
  *
  */
 #ifndef SHARE_VM_GC_IMPLEMENTATION_G1_HEAPREGIONTYPE_HPP
 #define SHARE_VM_GC_IMPLEMENTATION_G1_HEAPREGIONTYPE_HPP
 #include "memory/allocation.hpp"
 #define hrt_assert_is_valid(tag) \
   assert(is_valid((tag)), err_msg("invalid HR type: %u", (uint) (tag)))
 class HeapRegionType VALUE_OBJ_CLASS_SPEC {
 private:
   // We encode the value of the heap region type so the generation can be
   // determined quickly. The tag is split into two parts:
   //
   //   major type (young, humongous)                         : top N-1 bits
   //   minor type (eden / survivor, starts / cont hum, etc.) : bottom 1 bit
   //
   // If there's need to increase the number of minor types in the
   // future, we'll have to increase the size of the latter and hence
   // decrease the size of the former.
   //
   // 0000 0 [ 0] Free
   //
   // 0001 0      Young Mask
   // 0001 0 [ 2] Eden
   // 0001 1 [ 3] Survivor
   //
   // 0010 0      Humongous Mask
   // 0010 0 [ 4] Humongous Starts
   // 0010 1 [ 5] Humongous Continues
   //
   // 01000 [ 8] Old
   typedef enum {
     FreeTag       = 0,
     YoungMask     = 2,
     EdenTag       = YoungMask,
     SurvTag       = YoungMask + 1,
     HumMask       = 4,
     HumStartsTag  = HumMask,
     HumContTag    = HumMask + 1,
     OldTag        = 8
   } Tag;
   volatile Tag _tag;
   static bool is_valid(Tag tag);
   Tag get() const {
     hrt_assert_is_valid(_tag);
     return _tag;
   }
   // Sets the type to 'tag'.
   void set(Tag tag) {
     hrt_assert_is_valid(tag);
     hrt_assert_is_valid(_tag);
     _tag = tag;
   }
   // Sets the type to 'tag', expecting the type to be 'before'. This
   // is available for when we want to add sanity checking to the type
   // transition.
   void set_from(Tag tag, Tag before) {
     hrt_assert_is_valid(tag);
     hrt_assert_is_valid(before);
     hrt_assert_is_valid(_tag);
     assert(_tag == before,
            err_msg("HR tag: %u, expected: %u new tag; %u", _tag, before, tag));
     _tag = tag;
   }
 public:
   // Queries
   bool is_free() const { return get() == FreeTag; }
   bool is_young()    const { return (get() & YoungMask) != 0; }
   bool is_eden()     const { return get() == EdenTag;  }
   bool is_survivor() const { return get() == SurvTag;  }
   bool is_humongous()           const { return (get() & HumMask) != 0; }
   bool is_starts_humongous()    const { return get() == HumStartsTag;  }
   bool is_continues_humongous() const { return get() == HumContTag;    }
   bool is_old() const { return get() == OldTag; }
   // Setters
   void set_free() { set(FreeTag); }
   void set_eden()        { set_from(EdenTag, FreeTag); }
   void set_eden_pre_gc() { set_from(EdenTag, SurvTag); }
   void set_survivor()    { set_from(SurvTag, FreeTag); }
   void set_starts_humongous()    { set_from(HumStartsTag, FreeTag); }
   void set_continues_humongous() { set_from(HumContTag,   FreeTag); }
   void set_old() { set(OldTag); }
   // Misc
   const char* get_str() const;
   const char* get_short_str() const;
   HeapRegionType() : _tag(FreeTag) { hrt_assert_is_valid(_tag); }
 };
 #endif // SHARE_VM_GC_IMPLEMENTATION_G1_HEAPREGIONTYPE_HPP

Mercurial > jdk8-mips64-public > hotspot / annotate

src/share/vm/gc_implementation/g1/heapRegionType.hpp@c2844108a708 (annotated)

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