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 "gc/shared/strongRootsScope.hpp"
  28 #include "memory/allocation.hpp"
  29 #include "runtime/mutex.hpp"
  30 
  31 class CLDClosure;
  32 class CodeBlobClosure;
  33 class G1CollectedHeap;
  34 class G1GCPhaseTimes;
  35 class G1ParPushHeapRSClosure;
  36 class Monitor;
  37 class OopClosure;
  38 class SubTasksDone;
  39 
  40 class ShenandoahRootProcessor : public StackObj {
  41   SubTasksDone* _process_strong_tasks;
  42   StrongRootsScope _srs;
  43 
  44   enum Shenandoah_process_roots_tasks {
  45     SHENANDOAH_RP_PS_Universe_oops_do,
  46     SHENANDOAH_RP_PS_JNIHandles_oops_do,
  47     SHENANDOAH_RP_PS_JNIHandles_weak_oops_do,
  48     SHENANDOAH_RP_PS_ObjectSynchronizer_oops_do,
  49     SHENANDOAH_RP_PS_FlatProfiler_oops_do,
  50     SHENANDOAH_RP_PS_Management_oops_do,
  51     SHENANDOAH_RP_PS_SystemDictionary_oops_do,
  52     SHENANDOAH_RP_PS_ClassLoaderDataGraph_oops_do,
  53     SHENANDOAH_RP_PS_jvmti_oops_do,
  54     SHENANDOAH_RP_PS_CodeCache_oops_do,
  55     SHENANDOAH_RP_PS_filter_satb_buffers,
  56     SHENANDOAH_RP_PS_refProcessor_oops_do,
  57     // Leave this one last.
  58     SHENANDOAH_RP_PS_NumElements
  59   };
  60 
  61   void process_java_roots(OopClosure* scan_non_heap_roots,
  62                           CLDClosure* thread_stack_clds,
  63                           CLDClosure* scan_strong_clds,
  64                           CLDClosure* scan_weak_clds,
  65                           CodeBlobClosure* scan_strong_code,
  66                           uint worker_i);
  67 
  68   void process_vm_roots(OopClosure* scan_non_heap_roots,
  69                         OopClosure* scan_non_heap_weak_roots,
  70                         uint worker_i);
  71 
  72 public:
  73   ShenandoahRootProcessor(ShenandoahHeap* heap, uint n_workers);
  74 
  75   void process_roots(OopClosure* strong_oops,
  76                      OopClosure* weak_oops,
  77                      CLDClosure* strong_clds,
  78                      CLDClosure* weak_clds,
  79                      CLDClosure* thread_stack_clds,
  80                      CodeBlobClosure* strong_code);
  81 
  82   // Apply oops, clds and blobs to all strongly reachable roots in the system
  83   void process_strong_roots(OopClosure* oops,
  84                             CLDClosure* clds,
  85                             CodeBlobClosure* blobs);
  86 
  87   // Apply oops, clds and blobs to strongly and weakly reachable roots in the system
  88   void process_all_roots(OopClosure* oops,
  89                          CLDClosure* clds,
  90                          CodeBlobClosure* blobs);
  91 
  92   // Number of worker threads used by the root processor.
  93   uint n_workers() const;
  94 };
  95 
  96 #endif // SHARE_VM_GC_SHENANDOAH_SHENANDOAHROOTPROCESSOR_HPP