| /* |
| * Copyright (c) 2001, 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_SHARED_BARRIERSET_INLINE_HPP |
| #define SHARE_VM_GC_SHARED_BARRIERSET_INLINE_HPP |
| |
| #include "gc/shared/barrierSet.hpp" |
| #include "gc/shared/cardTableModRefBS.inline.hpp" |
| |
| // Inline functions of BarrierSet, which de-virtualize certain |
| // performance-critical calls when the barrier is the most common |
| // card-table kind. |
| |
| inline bool BarrierSet::devirtualize_reference_writes() const { |
| switch (kind()) { |
| case CardTableForRS: |
| case CardTableExtension: |
| return true; |
| default: |
| return false; |
| } |
| } |
| |
| template <class T> void BarrierSet::write_ref_field_pre(T* field, oop new_val) { |
| if (devirtualize_reference_writes()) { |
| barrier_set_cast<CardTableModRefBS>(this)->inline_write_ref_field_pre(field, new_val); |
| } else { |
| write_ref_field_pre_work(field, new_val); |
| } |
| } |
| |
| void BarrierSet::write_ref_field(void* field, oop new_val, bool release) { |
| if (devirtualize_reference_writes()) { |
| barrier_set_cast<CardTableModRefBS>(this)->inline_write_ref_field(field, new_val, release); |
| } else { |
| write_ref_field_work(field, new_val, release); |
| } |
| } |
| |
| // count is number of array elements being written |
| void BarrierSet::write_ref_array(HeapWord* start, size_t count) { |
| assert(count <= (size_t)max_intx, "count too large"); |
| HeapWord* end = (HeapWord*)((char*)start + (count*heapOopSize)); |
| // In the case of compressed oops, start and end may potentially be misaligned; |
| // so we need to conservatively align the first downward (this is not |
| // strictly necessary for current uses, but a case of good hygiene and, |
| // if you will, aesthetics) and the second upward (this is essential for |
| // current uses) to a HeapWord boundary, so we mark all cards overlapping |
| // this write. If this evolves in the future to calling a |
| // logging barrier of narrow oop granularity, like the pre-barrier for G1 |
| // (mentioned here merely by way of example), we will need to change this |
| // interface, so it is "exactly precise" (if i may be allowed the adverbial |
| // redundancy for emphasis) and does not include narrow oop slots not |
| // included in the original write interval. |
| HeapWord* aligned_start = (HeapWord*)align_size_down((uintptr_t)start, HeapWordSize); |
| HeapWord* aligned_end = (HeapWord*)align_size_up ((uintptr_t)end, HeapWordSize); |
| // If compressed oops were not being used, these should already be aligned |
| assert(UseCompressedOops || (aligned_start == start && aligned_end == end), |
| "Expected heap word alignment of start and end"); |
| write_ref_array_work(MemRegion(aligned_start, aligned_end)); |
| } |
| |
| |
| inline void BarrierSet::write_region(MemRegion mr) { |
| if (devirtualize_reference_writes()) { |
| barrier_set_cast<CardTableModRefBS>(this)->inline_write_region(mr); |
| } else { |
| write_region_work(mr); |
| } |
| } |
| |
| #endif // SHARE_VM_GC_SHARED_BARRIERSET_INLINE_HPP |