rev 55429 : 8226311: Shenandoah: Concurrent evacuation of OopStorage backed weak roots

   1 /*
   2  * Copyright (c) 2019, Red Hat, Inc. All rights reserved.
   3  *
   4  * This code is free software; you can redistribute it and/or modify it
   5  * under the terms of the GNU General Public License version 2 only, as
   6  * published by the Free Software Foundation.
   7  *
   8  * This code is distributed in the hope that it will be useful, but WITHOUT
   9  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  10  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  11  * version 2 for more details (a copy is included in the LICENSE file that
  12  * accompanied this code).
  13  *
  14  * You should have received a copy of the GNU General Public License version
  15  * 2 along with this work; if not, write to the Free Software Foundation,
  16  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  17  *
  18  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  19  * or visit www.oracle.com if you need additional information or have any
  20  * questions.
  21  *
  22  */
  23 
  24 #ifndef SHARE_GC_SHENANDOAH_SHENANDOAHROOTVERIFIER_HPP
  25 #define SHARE_GC_SHENANDOAH_SHENANDOAHROOTVERIFIER_HPP
  26 
  27 #include "memory/allocation.hpp"
  28 #include "memory/iterator.hpp"
  29 
  30 class ShenandoahRootVerifier : public StackObj {
  31 public:
  32   enum RootTypes {
  33     SerialRoots         = 1 << 0,
  34     ThreadRoots         = 1 << 1,
  35     CodeRoots           = 1 << 2,
  36     CLDGRoots           = 1 << 3,
  37     WeakRoots           = 1 << 4,
  38     StringDedupRoots    = 1 << 5,
  39     JNIHandleRoots      = 1 << 6,
  40     AllRoots            = (SerialRoots | ThreadRoots | CodeRoots | CLDGRoots | WeakRoots | StringDedupRoots | JNIHandleRoots)
  41   };
  42 
  43 private:
  44   RootTypes _types;
  45 
  46 public:
  47   ShenandoahRootVerifier();
  48 
  49   void excludes(RootTypes types);
  50   void oops_do(OopClosure* cl);
  51 
  52   // Used to seed ShenandoahVerifier, do not honor root type filter
  53   void roots_do(OopClosure* cl);
  54   void strong_roots_do(OopClosure* cl);


  55 private:
  56   bool verify(RootTypes type) const;
  57 };
  58 
  59 #endif // SHARE_GC_SHENANDOAH_SHENANDOAHROOTVERIFIER_HPP
--- EOF ---