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