1/* 2 * Copyright (c) 2007, 2016, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. Oracle designates this 8 * particular file as subject to the "Classpath" exception as provided 9 * by Oracle in the LICENSE file that accompanied this code. 10 * 11 * This code is distributed in the hope that it will be useful, but WITHOUT 12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 14 * version 2 for more details (a copy is included in the LICENSE file that 15 * accompanied this code). 16 * 17 * You should have received a copy of the GNU General Public License version 18 * 2 along with this work; if not, write to the Free Software Foundation, 19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 20 * 21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 22 * or visit www.oracle.com if you need additional information or have any 23 * questions. 24 */ 25 26package sun.java2d.marlin; 27 28import static sun.java2d.marlin.MarlinConst.LOG_UNSAFE_MALLOC; 29import jdk.internal.misc.Unsafe; 30import jdk.internal.ref.CleanerFactory; 31 32/** 33 * 34 * @author bourgesl 35 */ 36final class OffHeapArray { 37 38 // unsafe reference 39 static final Unsafe UNSAFE; 40 // size of int / float 41 static final int SIZE_INT; 42 43 static { 44 UNSAFE = Unsafe.getUnsafe(); 45 SIZE_INT = Unsafe.ARRAY_INT_INDEX_SCALE; 46 } 47 48 /* members */ 49 long address; 50 long length; 51 int used; 52 53 OffHeapArray(final Object parent, final long len) { 54 // note: may throw OOME: 55 this.address = UNSAFE.allocateMemory(len); 56 this.length = len; 57 this.used = 0; 58 if (LOG_UNSAFE_MALLOC) { 59 MarlinUtils.logInfo(System.currentTimeMillis() 60 + ": OffHeapArray.allocateMemory = " 61 + len + " to addr = " + this.address); 62 } 63 64 // Register a cleaning function to ensure freeing off-heap memory: 65 CleanerFactory.cleaner().register(parent, () -> this.free()); 66 } 67 68 /* 69 * As realloc may change the address, updating address is MANDATORY 70 * @param len new array length 71 * @throws OutOfMemoryError if the allocation is refused by the system 72 */ 73 void resize(final long len) { 74 // note: may throw OOME: 75 this.address = UNSAFE.reallocateMemory(address, len); 76 this.length = len; 77 if (LOG_UNSAFE_MALLOC) { 78 MarlinUtils.logInfo(System.currentTimeMillis() 79 + ": OffHeapArray.reallocateMemory = " 80 + len + " to addr = " + this.address); 81 } 82 } 83 84 void free() { 85 UNSAFE.freeMemory(this.address); 86 if (LOG_UNSAFE_MALLOC) { 87 MarlinUtils.logInfo(System.currentTimeMillis() 88 + ": OffHeapArray.freeMemory = " 89 + this.length 90 + " at addr = " + this.address); 91 } 92 } 93 94 void fill(final byte val) { 95 UNSAFE.setMemory(this.address, this.length, val); 96 } 97} 98