5211   }
5212 };
5213 
5214 // To minimize the remark pause times, the tasks below are done in parallel.
5215 class G1ParallelCleaningTask : public AbstractGangTask {
5216 private:
5217   G1StringSymbolTableUnlinkTask _string_symbol_task;
5218   G1CodeCacheUnloadingTask      _code_cache_task;
5219   G1KlassCleaningTask           _klass_cleaning_task;
5220 
5221 public:
5222   // The constructor is run in the VMThread.
5223   G1ParallelCleaningTask(BoolObjectClosure* is_alive, bool process_strings, bool process_symbols, uint num_workers, bool unloading_occurred) :
5224       AbstractGangTask("Parallel Cleaning"),
5225       _string_symbol_task(is_alive, process_strings, process_symbols),
5226       _code_cache_task(num_workers, is_alive, unloading_occurred),
5227       _klass_cleaning_task(is_alive) {
5228   }
5229 
5230   void pre_work_verification() {
5231     assert(!MetadataOnStackMark::has_buffer_for_thread(Thread::current()), "Should be empty");


5232   }
5233 
5234   void post_work_verification() {
5235     assert(!MetadataOnStackMark::has_buffer_for_thread(Thread::current()), "Should be empty");
5236   }
5237 
5238   // The parallel work done by all worker threads.
5239   void work(uint worker_id) {
5240     pre_work_verification();
5241 
5242     // Do first pass of code cache cleaning.
5243     _code_cache_task.work_first_pass(worker_id);
5244 
5245     // Let the threads mark that the first pass is done.
5246     _code_cache_task.barrier_mark(worker_id);
5247 
5248     // Clean the Strings and Symbols.
5249     _string_symbol_task.work(worker_id);
5250 
5251     // Wait for all workers to finish the first code cache cleaning pass.

5211   }
5212 };
5213 
5214 // To minimize the remark pause times, the tasks below are done in parallel.
5215 class G1ParallelCleaningTask : public AbstractGangTask {
5216 private:
5217   G1StringSymbolTableUnlinkTask _string_symbol_task;
5218   G1CodeCacheUnloadingTask      _code_cache_task;
5219   G1KlassCleaningTask           _klass_cleaning_task;
5220 
5221 public:
5222   // The constructor is run in the VMThread.
5223   G1ParallelCleaningTask(BoolObjectClosure* is_alive, bool process_strings, bool process_symbols, uint num_workers, bool unloading_occurred) :
5224       AbstractGangTask("Parallel Cleaning"),
5225       _string_symbol_task(is_alive, process_strings, process_symbols),
5226       _code_cache_task(num_workers, is_alive, unloading_occurred),
5227       _klass_cleaning_task(is_alive) {
5228   }
5229 
5230   void pre_work_verification() {
5231     // The VM Thread will have registered Metadata during the single-threaded phase of MetadataStackOnMark.
5232     assert(Thread::current()->is_VM_thread()
5233            || !MetadataOnStackMark::has_buffer_for_thread(Thread::current()), "Should be empty");
5234   }
5235 
5236   void post_work_verification() {
5237     assert(!MetadataOnStackMark::has_buffer_for_thread(Thread::current()), "Should be empty");
5238   }
5239 
5240   // The parallel work done by all worker threads.
5241   void work(uint worker_id) {
5242     pre_work_verification();
5243 
5244     // Do first pass of code cache cleaning.
5245     _code_cache_task.work_first_pass(worker_id);
5246 
5247     // Let the threads mark that the first pass is done.
5248     _code_cache_task.barrier_mark(worker_id);
5249 
5250     // Clean the Strings and Symbols.
5251     _string_symbol_task.work(worker_id);
5252 
5253     // Wait for all workers to finish the first code cache cleaning pass.