1/*
2 * Copyright (c) 2012, 2015, 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.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 */
23package org.graalvm.compiler.hotspot.replacements;
24
25import static org.graalvm.compiler.hotspot.replacements.HotSpotReplacementsUtil.arrayBaseOffset;
26
27import java.util.zip.CRC32;
28
29import org.graalvm.compiler.api.replacements.ClassSubstitution;
30import org.graalvm.compiler.api.replacements.Fold;
31import org.graalvm.compiler.api.replacements.Fold.InjectedParameter;
32import org.graalvm.compiler.api.replacements.MethodSubstitution;
33import org.graalvm.compiler.core.common.spi.ForeignCallDescriptor;
34import org.graalvm.compiler.graph.Node.ConstantNodeParameter;
35import org.graalvm.compiler.graph.Node.NodeIntrinsic;
36import org.graalvm.compiler.hotspot.GraalHotSpotVMConfig;
37import org.graalvm.compiler.hotspot.nodes.ComputeObjectAddressNode;
38import org.graalvm.compiler.hotspot.nodes.GraalHotSpotVMConfigNode;
39import org.graalvm.compiler.nodes.extended.ForeignCallNode;
40import org.graalvm.compiler.word.Word;
41import org.graalvm.word.Pointer;
42import org.graalvm.word.WordBase;
43import org.graalvm.word.WordFactory;
44
45import jdk.vm.ci.meta.JavaKind;
46
47// JaCoCo Exclude
48
49/**
50 * Substitutions for {@link CRC32}.
51 */
52@ClassSubstitution(CRC32.class)
53public class CRC32Substitutions {
54
55    /**
56     * Gets the address of {@code StubRoutines::x86::_crc_table} in {@code stubRoutines_x86.hpp}.
57     */
58    @Fold
59    static long crcTableAddress(@InjectedParameter GraalHotSpotVMConfig config) {
60        return config.crcTableAddress;
61    }
62
63    /**
64     * Removed in 9.
65     */
66    @MethodSubstitution(optional = true)
67    static int update(int crc, int b) {
68        final Pointer crcTableRawAddress = WordFactory.pointer(GraalHotSpotVMConfigNode.crcTableAddress());
69
70        int c = ~crc;
71        int index = (b ^ c) & 0xFF;
72        int offset = index << 2;
73        int result = crcTableRawAddress.readInt(offset);
74        result = result ^ (c >>> 8);
75        return ~result;
76    }
77
78    /**
79     * Removed in 9.
80     */
81    @MethodSubstitution(optional = true)
82    static int updateBytes(int crc, byte[] buf, int off, int len) {
83        Word bufAddr = WordFactory.unsigned(ComputeObjectAddressNode.get(buf, arrayBaseOffset(JavaKind.Byte) + off));
84        return updateBytesCRC32(UPDATE_BYTES_CRC32, crc, bufAddr, len);
85    }
86
87    /**
88     * @since 9
89     */
90    @MethodSubstitution(optional = true)
91    static int updateBytes0(int crc, byte[] buf, int off, int len) {
92        Word bufAddr = WordFactory.unsigned(ComputeObjectAddressNode.get(buf, arrayBaseOffset(JavaKind.Byte) + off));
93        return updateBytesCRC32(UPDATE_BYTES_CRC32, crc, bufAddr, len);
94    }
95
96    /**
97     * Removed in 9.
98     */
99    @MethodSubstitution(optional = true)
100    static int updateByteBuffer(int crc, long addr, int off, int len) {
101        WordBase bufAddr = WordFactory.unsigned(addr).add(off);
102        return updateBytesCRC32(UPDATE_BYTES_CRC32, crc, bufAddr, len);
103    }
104
105    /**
106     * @since 9
107     */
108    @MethodSubstitution(optional = true)
109    static int updateByteBuffer0(int crc, long addr, int off, int len) {
110        WordBase bufAddr = WordFactory.unsigned(addr).add(off);
111        return updateBytesCRC32(UPDATE_BYTES_CRC32, crc, bufAddr, len);
112    }
113
114    public static final ForeignCallDescriptor UPDATE_BYTES_CRC32 = new ForeignCallDescriptor("updateBytesCRC32", int.class, int.class, WordBase.class, int.class);
115
116    @NodeIntrinsic(ForeignCallNode.class)
117    public static native int updateBytesCRC32(@ConstantNodeParameter ForeignCallDescriptor descriptor, int crc, WordBase buf, int length);
118}
119