| /* |
| * Copyright (c) 2007, 2018, 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. Oracle designates this |
| * particular file as subject to the "Classpath" exception as provided |
| * by Oracle in the LICENSE file that accompanied this code. |
| * |
| * 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. |
| */ |
| |
| package sun.java2d.marlin; |
| |
| import static sun.java2d.marlin.MarlinConst.LOG_UNSAFE_MALLOC; |
| import jdk.internal.misc.Unsafe; |
| import jdk.internal.ref.CleanerFactory; |
| |
| /** |
| * |
| */ |
| final class OffHeapArray { |
| |
| // unsafe reference |
| static final Unsafe UNSAFE; |
| // size of int / float |
| static final int SIZE_INT; |
| |
| static { |
| UNSAFE = Unsafe.getUnsafe(); |
| SIZE_INT = Unsafe.ARRAY_INT_INDEX_SCALE; |
| } |
| |
| /* members */ |
| long address; |
| long length; |
| int used; |
| |
| OffHeapArray(final Object parent, final long len) { |
| // note: may throw OOME: |
| this.address = UNSAFE.allocateMemory(len); |
| this.length = len; |
| this.used = 0; |
| if (LOG_UNSAFE_MALLOC) { |
| MarlinUtils.logInfo(System.currentTimeMillis() |
| + ": OffHeapArray.allocateMemory = " |
| + len + " to addr = " + this.address); |
| } |
| |
| // Register a cleaning function to ensure freeing off-heap memory: |
| CleanerFactory.cleaner().register(parent, () -> this.free()); |
| } |
| |
| /* |
| * As realloc may change the address, updating address is MANDATORY |
| * @param len new array length |
| * @throws OutOfMemoryError if the allocation is refused by the system |
| */ |
| void resize(final long len) { |
| // note: may throw OOME: |
| this.address = UNSAFE.reallocateMemory(address, len); |
| this.length = len; |
| if (LOG_UNSAFE_MALLOC) { |
| MarlinUtils.logInfo(System.currentTimeMillis() |
| + ": OffHeapArray.reallocateMemory = " |
| + len + " to addr = " + this.address); |
| } |
| } |
| |
| void free() { |
| UNSAFE.freeMemory(this.address); |
| if (LOG_UNSAFE_MALLOC) { |
| MarlinUtils.logInfo(System.currentTimeMillis() |
| + ": OffHeapArray.freeMemory = " |
| + this.length |
| + " at addr = " + this.address); |
| } |
| this.address = 0L; |
| } |
| |
| void fill(final byte val) { |
| UNSAFE.setMemory(this.address, this.length, val); |
| } |
| } |