| /* |
| * Copyright (c) 2016, 2017, 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_G1_G1CONCURRENTMARKOBJARRAYPROCESSOR_HPP |
| #define SHARE_VM_GC_G1_G1CONCURRENTMARKOBJARRAYPROCESSOR_HPP |
| |
| #include "oops/oopsHierarchy.hpp" |
| #include "memory/allocation.hpp" |
| |
| class G1CMTask; |
| |
| // Helper class to mark through large objArrays during marking in an efficient way. |
| // Instead of pushing large object arrays, we push continuations onto the |
| // mark stack. These continuations are identified by having their LSB set. |
| // This allows incremental processing of large objects. |
| class G1CMObjArrayProcessor VALUE_OBJ_CLASS_SPEC { |
| private: |
| // Reference to the task for doing the actual work. |
| G1CMTask* _task; |
| |
| // Push the continuation at the given address onto the mark stack. |
| void push_array_slice(HeapWord* addr); |
| |
| // Process (apply the closure) on the given continuation of the given objArray. |
| size_t process_array_slice(objArrayOop const obj, HeapWord* start_from, size_t remaining); |
| public: |
| static bool should_be_sliced(oop obj); |
| |
| G1CMObjArrayProcessor(G1CMTask* task) : _task(task) { |
| } |
| |
| // Process the given continuation. Returns the number of words scanned. |
| size_t process_slice(HeapWord* slice); |
| // Start processing the given objArrayOop by scanning the header and pushing its |
| // continuation. |
| size_t process_obj(oop obj); |
| }; |
| |
| #endif /* SHARE_VM_GC_G1_G1CONCURRENTMARKOBJARRAYPROCESSOR_HPP */ |