| /* |
| * Copyright (c) 2016, 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_PARALLEL_OBJECTSTARTARRAY_INLINE_HPP |
| #define SHARE_VM_GC_PARALLEL_OBJECTSTARTARRAY_INLINE_HPP |
| |
| #include "gc/parallel/objectStartArray.hpp" |
| |
| // Optimized for finding the first object that crosses into |
| // a given block. The blocks contain the offset of the last |
| // object in that block. Scroll backwards by one, and the first |
| // object hit should be at the beginning of the block |
| HeapWord* ObjectStartArray::object_start(HeapWord* addr) const { |
| assert_covered_region_contains(addr); |
| jbyte* block = block_for_addr(addr); |
| HeapWord* scroll_forward = offset_addr_for_block(block--); |
| while (scroll_forward > addr) { |
| scroll_forward = offset_addr_for_block(block--); |
| } |
| |
| HeapWord* next = scroll_forward; |
| while (next <= addr) { |
| scroll_forward = next; |
| next += oop(next)->size(); |
| } |
| assert(scroll_forward <= addr, "wrong order for current and arg"); |
| assert(addr <= next, "wrong order for arg and next"); |
| return scroll_forward; |
| } |
| |
| |
| #endif // SHARE_VM_GC_PARALLEL_OBJECTSTARTARRAY_INLINE_HPP |