1 /*
   2  * Copyright (c) 2015, 2019, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.
   8  *
   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_GC_G1_G1ROOTCLOSURES_HPP
  26 #define SHARE_GC_G1_G1ROOTCLOSURES_HPP
  27 
  28 #include "memory/allocation.hpp"
  29 #include "memory/iterator.hpp"
  30 
  31 class G1CollectedHeap;
  32 class G1ParScanThreadState;
  33 
  34 class G1RootClosures : public CHeapObj<mtGC> {
  35 public:
  36   virtual ~G1RootClosures() {}
  37 
  38 // Closures to process raw oops in the root set.
  39   virtual OopClosure* weak_oops() = 0;
  40   virtual OopClosure* strong_oops() = 0;
  41 
  42   // Closures to process CLDs in the root set.
  43   virtual CLDClosure* weak_clds() = 0;
  44   virtual CLDClosure* strong_clds() = 0;
  45 
  46   // Applied to code blobs reachable as strong roots.
  47   virtual CodeBlobClosure* strong_codeblobs() = 0;
  48 };
  49 
  50 class G1EvacuationRootClosures : public G1RootClosures {
  51 public:
  52   // Applied to the weakly reachable CLDs when all strongly reachable
  53   // CLDs are guaranteed to have been processed.
  54   virtual CLDClosure* second_pass_weak_clds() = 0;
  55 
  56   // Get a raw oop closure for processing oops, bypassing the flushing above.
  57   virtual OopClosure* raw_strong_oops() = 0;
  58 
  59   // Applied to code blobs treated as weak roots.
  60   virtual CodeBlobClosure* weak_codeblobs() = 0;
  61 
  62   // Is this closure used for tracing metadata?
  63   virtual bool trace_metadata() = 0;
  64 
  65   static G1EvacuationRootClosures* create_root_closures(G1ParScanThreadState* pss, G1CollectedHeap* g1h);
  66 };
  67 
  68 #endif // SHARE_GC_G1_G1ROOTCLOSURES_HPP