1 /*
   2  * Copyright (c) 2015, Red Hat, Inc. and/or its affiliates.
   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_VM_GC_SHENANDOAH_SHENANDOAHROOTPROCESSOR_HPP
  25 #define SHARE_VM_GC_SHENANDOAH_SHENANDOAHROOTPROCESSOR_HPP
  26 
  27 #include "code/codeCache.hpp"
  28 #include "gc/shared/oopStorageParState.hpp"
  29 #include "gc/shenandoah/shenandoahCodeRoots.hpp"
  30 #include "gc/shenandoah/shenandoahHeap.hpp"
  31 #include "gc/shenandoah/shenandoahPhaseTimings.hpp"
  32 #include "gc/shared/strongRootsScope.hpp"
  33 #include "gc/shared/workgroup.hpp"
  34 #include "memory/allocation.hpp"
  35 #include "memory/iterator.hpp"
  36 
  37 class ParallelCLDRootIterator {
  38 public:
  39   ParallelCLDRootIterator();
  40   void root_cld_do(CLDClosure* strong, CLDClosure* weak);
  41 };
  42 
  43 enum Shenandoah_process_roots_tasks {
  44   SHENANDOAH_RP_PS_Universe_oops_do,
  45   SHENANDOAH_RP_PS_JNIHandles_oops_do,
  46   SHENANDOAH_RP_PS_JNIHandles_weak_oops_do,
  47   SHENANDOAH_RP_PS_ObjectSynchronizer_oops_do,
  48   SHENANDOAH_RP_PS_Management_oops_do,
  49   SHENANDOAH_RP_PS_SystemDictionary_oops_do,
  50   SHENANDOAH_RP_PS_jvmti_oops_do,
  51   // Leave this one last.
  52   SHENANDOAH_RP_PS_NumElements
  53 };
  54 
  55 class ShenandoahRootProcessor : public StackObj {
  56   SubTasksDone* _process_strong_tasks;
  57   StrongRootsScope _srs;
  58   ShenandoahPhaseTimings::Phase _phase;
  59   ParallelCLDRootIterator   _cld_iterator;
  60   ShenandoahAllCodeRootsIterator _coderoots_all_iterator;
  61   CodeBlobClosure* _threads_nmethods_cl;
  62 
  63   void process_java_roots(OopClosure* scan_non_heap_roots,
  64                           CLDClosure* scan_strong_clds,
  65                           CLDClosure* scan_weak_clds,
  66                           CodeBlobClosure* scan_strong_code,
  67                           ThreadClosure* thread_cl,
  68                           uint worker_i);
  69 
  70   void process_vm_roots(OopClosure* scan_non_heap_roots,
  71                         OopClosure* scan_non_heap_weak_roots,
  72                         OopClosure* weak_jni_roots,
  73                         uint worker_i);
  74 
  75 public:
  76   ShenandoahRootProcessor(ShenandoahHeap* heap, uint n_workers,
  77                           ShenandoahPhaseTimings::Phase phase);
  78   ~ShenandoahRootProcessor();
  79 
  80   // Apply oops, clds and blobs to all strongly reachable roots in the system
  81   void process_strong_roots(OopClosure* oops, OopClosure* weak_oops,
  82                             CLDClosure* clds,
  83                             CLDClosure* weak_clds,
  84                             CodeBlobClosure* blobs,
  85                             ThreadClosure* thread_cl,
  86                             uint worker_id);
  87 
  88   // Apply oops, clds and blobs to strongly and weakly reachable roots in the system
  89   void process_all_roots(OopClosure* oops, OopClosure* weak_oops,
  90                          CLDClosure* clds,
  91                          CodeBlobClosure* blobs,
  92                          ThreadClosure* thread_cl,
  93                          uint worker_id);
  94 
  95   // For slow debug/verification code
  96   void process_all_roots_slow(OopClosure* oops);
  97 
  98   // Number of worker threads used by the root processor.
  99   uint n_workers() const;
 100 };
 101 
 102 class ShenandoahRootEvacuator : public StackObj {
 103   StrongRootsScope _srs;
 104   ShenandoahPhaseTimings::Phase _phase;
 105   ShenandoahCsetCodeRootsIterator _coderoots_cset_iterator;
 106 
 107 public:
 108   ShenandoahRootEvacuator(ShenandoahHeap* heap, uint n_workers,
 109                           ShenandoahPhaseTimings::Phase phase);
 110   ~ShenandoahRootEvacuator();
 111 
 112   void process_evacuate_roots(OopClosure* oops,
 113                               CodeBlobClosure* blobs,
 114                               uint worker_id);
 115 
 116   // Number of worker threads used by the root processor.
 117   uint n_workers() const;
 118 };
 119 #endif // SHARE_VM_GC_SHENANDOAH_SHENANDOAHROOTPROCESSOR_HPP