| /* |
| * 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. |
| * |
| */ |
| |
| #include "precompiled.hpp" |
| #include "gc/g1/g1ConcurrentMark.inline.hpp" |
| #include "gc/g1/g1ConcurrentMarkObjArrayProcessor.inline.hpp" |
| |
| void G1CMObjArrayProcessor::push_array_slice(HeapWord* what) { |
| _task->push(G1TaskQueueEntry::from_slice(what)); |
| } |
| |
| size_t G1CMObjArrayProcessor::process_array_slice(objArrayOop obj, HeapWord* start_from, size_t remaining) { |
| size_t words_to_scan = MIN2(remaining, ObjArrayMarkingStride); |
| |
| if (remaining > ObjArrayMarkingStride) { |
| push_array_slice(start_from + ObjArrayMarkingStride); |
| } |
| |
| // Then process current area. |
| MemRegion mr(start_from, words_to_scan); |
| return _task->scan_objArray(obj, mr); |
| } |
| |
| size_t G1CMObjArrayProcessor::process_obj(oop obj) { |
| assert(should_be_sliced(obj), "Must be an array object %d and large " SIZE_FORMAT, obj->is_objArray(), (size_t)obj->size()); |
| |
| return process_array_slice(objArrayOop(obj), (HeapWord*)obj, (size_t)objArrayOop(obj)->size()); |
| } |
| |
| size_t G1CMObjArrayProcessor::process_slice(HeapWord* slice) { |
| |
| // Find the start address of the objArrayOop. |
| // Shortcut the BOT access if the given address is from a humongous object. The BOT |
| // slide is fast enough for "smaller" objects in non-humongous regions, but is slower |
| // than directly using heap region table. |
| G1CollectedHeap* g1h = G1CollectedHeap::heap(); |
| HeapRegion* r = g1h->heap_region_containing(slice); |
| |
| HeapWord* const start_address = r->is_humongous() ? |
| r->humongous_start_region()->bottom() : |
| g1h->block_start(slice); |
| |
| assert(oop(start_address)->is_objArray(), "Address " PTR_FORMAT " does not refer to an object array ", p2i(start_address)); |
| assert(start_address < slice, |
| "Object start address " PTR_FORMAT " must be smaller than decoded address " PTR_FORMAT, |
| p2i(start_address), |
| p2i(slice)); |
| |
| objArrayOop objArray = objArrayOop(start_address); |
| |
| size_t already_scanned = slice - start_address; |
| size_t remaining = objArray->size() - already_scanned; |
| |
| return process_array_slice(objArray, slice, remaining); |
| } |