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_VM_GC_IMPLEMENTATION_G1_ROOTPROCESSOR_HPP
  26 #define SHARE_VM_GC_IMPLEMENTATION_G1_ROOTPROCESSOR_HPP
  27 
  28 #include "memory/allocation.hpp"
  29 #include "memory/sharedHeap.hpp"
  30 #include "runtime/mutex.hpp"
  31 
  32 class CLDClosure;
  33 class CodeBlobClosure;
  34 class G1CollectedHeap;
  35 class G1GCPhaseTimes;
  36 class G1ParPushHeapRSClosure;
  37 class Monitor;
  38 class OopClosure;
  39 class SubTasksDone;
  40 
  41 // Scoped object to assist in applying oop, CLD and code blob closures to
  42 // root locations. Handles claiming of different root scanning tasks
  43 // and takes care of global state for root scanning via a StrongRootsScope.
  44 // In the parallel case there is a shared G1RootProcessor object where all
  45 // worker thread call the process_roots methods.
  46 class G1RootProcessor : public StackObj {
  47   G1CollectedHeap* _g1h;
  48   SubTasksDone* _process_strong_tasks;
  49   SharedHeap::StrongRootsScope _srs;
  50 
  51   // Used to implement the Thread work barrier.
  52   Monitor _lock;
  53   volatile jint _n_workers_discovered_strong_classes;
  54 
  55   enum G1H_process_roots_tasks {
  56     G1RP_PS_Universe_oops_do,
  57     G1RP_PS_JNIHandles_oops_do,
  58     G1RP_PS_ObjectSynchronizer_oops_do,
  59     G1RP_PS_FlatProfiler_oops_do,
  60     G1RP_PS_Management_oops_do,
  61     G1RP_PS_SystemDictionary_oops_do,
  62     G1RP_PS_ClassLoaderDataGraph_oops_do,
  63     G1RP_PS_jvmti_oops_do,
  64     G1RP_PS_CodeCache_oops_do,
  65     G1RP_PS_filter_satb_buffers,
  66     G1RP_PS_refProcessor_oops_do,
  67     // Leave this one last.
  68     G1RP_PS_NumElements
  69   };

   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_VM_GC_IMPLEMENTATION_G1_ROOTPROCESSOR_HPP
  26 #define SHARE_VM_GC_IMPLEMENTATION_G1_ROOTPROCESSOR_HPP
  27 
  28 #include "memory/allocation.hpp"
  29 #include "memory/strongRootsScope.hpp"
  30 #include "runtime/mutex.hpp"
  31 
  32 class CLDClosure;
  33 class CodeBlobClosure;
  34 class G1CollectedHeap;
  35 class G1GCPhaseTimes;
  36 class G1ParPushHeapRSClosure;
  37 class Monitor;
  38 class OopClosure;
  39 class SubTasksDone;
  40 
  41 // Scoped object to assist in applying oop, CLD and code blob closures to
  42 // root locations. Handles claiming of different root scanning tasks
  43 // and takes care of global state for root scanning via a StrongRootsScope.
  44 // In the parallel case there is a shared G1RootProcessor object where all
  45 // worker thread call the process_roots methods.
  46 class G1RootProcessor : public StackObj {
  47   G1CollectedHeap* _g1h;
  48   SubTasksDone* _process_strong_tasks;
  49   StrongRootsScope _srs;
  50 
  51   // Used to implement the Thread work barrier.
  52   Monitor _lock;
  53   volatile jint _n_workers_discovered_strong_classes;
  54 
  55   enum G1H_process_roots_tasks {
  56     G1RP_PS_Universe_oops_do,
  57     G1RP_PS_JNIHandles_oops_do,
  58     G1RP_PS_ObjectSynchronizer_oops_do,
  59     G1RP_PS_FlatProfiler_oops_do,
  60     G1RP_PS_Management_oops_do,
  61     G1RP_PS_SystemDictionary_oops_do,
  62     G1RP_PS_ClassLoaderDataGraph_oops_do,
  63     G1RP_PS_jvmti_oops_do,
  64     G1RP_PS_CodeCache_oops_do,
  65     G1RP_PS_filter_satb_buffers,
  66     G1RP_PS_refProcessor_oops_do,
  67     // Leave this one last.
  68     G1RP_PS_NumElements
  69   };