| /* |
| * Copyright (c) 2015, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. |
| * |
| * This code is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * 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). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| * |
| */ |
| |
| #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 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_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); |
| |
| 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); |
| |
| // 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 |