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  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

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  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

  * version 2 for more details (a copy is included in the LICENSE file that

  * accompanied this code).

  *

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 #ifndef SHARE_VM_GC_IMPLEMENTATION_G1_ROOTPROCESSOR_HPP

 #define SHARE_VM_GC_IMPLEMENTATION_G1_ROOTPROCESSOR_HPP

 #include "memory/allocation.hpp"

 #include "memory/sharedHeap.hpp"

 #include "runtime/mutex.hpp"

 class CLDClosure;

 class CodeBlobClosure;

 class G1CollectedHeap;

 class G1GCPhaseTimes;

 class G1ParPushHeapRSClosure;

 class G1RootClosures;

 class Monitor;

 class OopClosure;

 class SubTasksDone;

 // Scoped object to assist in applying oop, CLD and code blob closures to

 // root locations. Handles claiming of different root scanning tasks

 // and takes care of global state for root scanning via a StrongRootsScope.

 // In the parallel case there is a shared G1RootProcessor object where all

 // worker thread call the process_roots methods.

 class G1RootProcessor : public StackObj {

   G1CollectedHeap* _g1h;

   SubTasksDone _process_strong_tasks;

   SharedHeap::StrongRootsScope _srs;

   // Used to implement the Thread work barrier.

   Monitor _lock;

   volatile jint _n_workers_discovered_strong_classes;

   enum G1H_process_roots_tasks {

     G1RP_PS_Universe_oops_do,

     G1RP_PS_JNIHandles_oops_do,

     G1RP_PS_ObjectSynchronizer_oops_do,

     G1RP_PS_FlatProfiler_oops_do,

     G1RP_PS_Management_oops_do,

     G1RP_PS_SystemDictionary_oops_do,

     G1RP_PS_ClassLoaderDataGraph_oops_do,

     G1RP_PS_jvmti_oops_do,

     G1RP_PS_CodeCache_oops_do,

     G1RP_PS_filter_satb_buffers,

     G1RP_PS_refProcessor_oops_do,

     // Leave this one last.

     G1RP_PS_NumElements

   };

   void worker_has_discovered_all_strong_classes();

   void wait_until_all_strong_classes_discovered();

   void process_all_roots(OopClosure* oops,

                          CLDClosure* clds,

                          CodeBlobClosure* blobs,

                          bool process_string_table);

   void process_java_roots(OopClosure* scan_non_heap_roots,

                           CLDClosure* thread_stack_clds,

                           CLDClosure* scan_strong_clds,

                           CLDClosure* scan_weak_clds,

                           CodeBlobClosure* scan_strong_code,

                           G1GCPhaseTimes* phase_times,

                           uint worker_i);

   void process_vm_roots(OopClosure* scan_non_heap_roots,

                         OopClosure* scan_non_heap_weak_roots,

                         G1GCPhaseTimes* phase_times,

                         uint worker_i);

   void process_string_table_roots(OopClosure* scan_non_heap_weak_roots,

                                   G1GCPhaseTimes* phase_times,

                                   uint worker_i);

   void process_code_cache_roots(CodeBlobClosure* code_closure,

                                 G1GCPhaseTimes* phase_times,

                                 uint worker_i);

 public:

   G1RootProcessor(G1CollectedHeap* g1h);

   // Apply closures to the strongly and weakly reachable roots in the system

   // in a single pass.

   // Record and report timing measurements for sub phases using the worker_i

   void evacuate_roots(OopClosure* scan_non_heap_roots,

                       OopClosure* scan_non_heap_weak_roots,

                       CLDClosure* scan_strong_clds,

                       CLDClosure* scan_weak_clds,

                       bool trace_metadata,

                       uint worker_i);

   // Apply oops, clds and blobs to all strongly reachable roots in the system

   void process_strong_roots(OopClosure* oops,

                             CLDClosure* clds,

                             CodeBlobClosure* blobs);

   // Apply oops, clds and blobs to strongly and weakly reachable roots in the system

   void process_all_roots(OopClosure* oops,

                          CLDClosure* clds,

                          CodeBlobClosure* blobs);

   // Apply scan_rs to all locations in the union of the remembered sets for all

   // regions in the collection set

   // (having done "set_region" to indicate the region in which the root resides),

   void scan_remembered_sets(G1ParPushHeapRSClosure* scan_rs,

                             OopClosure* scan_non_heap_weak_roots,

                             uint worker_i);

   // Apply oops, clds and blobs to strongly and weakly reachable roots in the system,

   // the only thing different from process_all_roots is that we skip the string table

   // to avoid keeping every string live when doing class unloading.

   void process_all_roots_no_string_table(OopClosure* oops,

                                          CLDClosure* clds,

                                          CodeBlobClosure* blobs);

   // Inform the root processor about the number of worker threads

   void set_num_workers(int active_workers);

 };

 #endif // SHARE_VM_GC_IMPLEMENTATION_G1_ROOTPROCESSOR_HPP