jdk8-mips64-public/hotspot: src/share/vm/gc_implementation/g1/heapRegionSets.hpp@e1162778c1c8 (annotated)

src/share/vm/gc_implementation/g1/heapRegionSets.hpp@e1162778c1c8 (annotated)

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

Thu, 07 Apr 2011 09:53:20 -0700

author: johnc
date: Thu, 07 Apr 2011 09:53:20 -0700
changeset 2781: e1162778c1c8
parent 2472: 0fa27f37d4d4
child 2962: ae5b2f1dcf12
permissions: -rw-r--r--

7009266: G1: assert(obj->is_oop_or_null(true )) failed: Error
Summary: A referent object that is only weakly reachable at the start of concurrent marking but is re-attached to the strongly reachable object graph during marking may not be marked as live. This can cause the reference object to be processed prematurely and leave dangling pointers to the referent object. Implement a read barrier for the java.lang.ref.Reference::referent field by intrinsifying the Reference.get() method, and intercepting accesses though JNI, reflection, and Unsafe, so that when a non-null referent object is read it is also logged in an SATB buffer.
Reviewed-by: kvn, iveresov, never, tonyp, dholmes

 /*
  * copyright (c) 2011, 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_HEAPREGIONSETS_HPP
 #define SHARE_VM_GC_IMPLEMENTATION_G1_HEAPREGIONSETS_HPP
 #include "gc_implementation/g1/heapRegionSet.inline.hpp"
 //////////////////// FreeRegionList ////////////////////
 class FreeRegionList : public HeapRegionLinkedList {
 protected:
   virtual const char* verify_region_extra(HeapRegion* hr);
   virtual bool regions_humongous() { return false; }
   virtual bool regions_empty()     { return true;  }
 public:
   FreeRegionList(const char* name) : HeapRegionLinkedList(name) { }
 };
 //////////////////// MasterFreeRegionList ////////////////////
 class MasterFreeRegionList : public FreeRegionList {
 protected:
   virtual bool check_mt_safety();
 public:
   MasterFreeRegionList(const char* name) : FreeRegionList(name) { }
 };
 //////////////////// SecondaryFreeRegionList ////////////////////
 class SecondaryFreeRegionList : public FreeRegionList {
 protected:
   virtual bool check_mt_safety();
 public:
   SecondaryFreeRegionList(const char* name) : FreeRegionList(name) { }
 };
 //////////////////// HumongousRegionSet ////////////////////
 class HumongousRegionSet : public HeapRegionSet {
 protected:
   virtual const char* verify_region_extra(HeapRegion* hr);
   virtual bool regions_humongous() { return true;  }
   virtual bool regions_empty()     { return false; }
 public:
   HumongousRegionSet(const char* name) : HeapRegionSet(name) { }
 };
 //////////////////// MasterHumongousRegionSet ////////////////////
 class MasterHumongousRegionSet : public HumongousRegionSet {
 protected:
   virtual bool check_mt_safety();
 public:
   MasterHumongousRegionSet(const char* name) : HumongousRegionSet(name) { }
 };
 #endif // SHARE_VM_GC_IMPLEMENTATION_G1_HEAPREGIONSETS_HPP

Mercurial > jdk8-mips64-public > hotspot / annotate

src/share/vm/gc_implementation/g1/heapRegionSets.hpp@e1162778c1c8 (annotated)

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