CRC32Substitutions.java revision 12748:fbb9c8026495 
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;
41
42import jdk.vm.ci.meta.JavaKind;
43
44// JaCoCo Exclude
45
46/**
47 * Substitutions for {@link CRC32}.
48 */
49@ClassSubstitution(CRC32.class)
50public class CRC32Substitutions {
51
52    /**
53     * Gets the address of {@code StubRoutines::x86::_crc_table} in {@code stubRoutines_x86.hpp}.
54     */
55    @Fold
56    static long crcTableAddress(@InjectedParameter GraalHotSpotVMConfig config) {
57        return config.crcTableAddress;
58    }
59
60    @MethodSubstitution(optional = true)
61    static int update(int crc, int b) {
62        final long crcTableRawAddress = GraalHotSpotVMConfigNode.crcTableAddress();
63
64        int c = ~crc;
65        int index = (b ^ c) & 0xFF;
66        int offset = index << 2;
67        int result = Word.unsigned(crcTableRawAddress).readInt(offset);
68        result = result ^ (c >>> 8);
69        return ~result;
70    }
71
72    @MethodSubstitution(optional = true)
73    static int updateBytes(int crc, byte[] buf, int off, int len) {
74        Word bufAddr = Word.unsigned(ComputeObjectAddressNode.get(buf, arrayBaseOffset(JavaKind.Byte) + off));
75        return updateBytesCRC32(UPDATE_BYTES_CRC32, crc, bufAddr, len);
76    }
77
78    /**
79     * @since 9
80     */
81    @MethodSubstitution(optional = true)
82    static int updateBytes0(int crc, byte[] buf, int off, int len) {
83        Word bufAddr = Word.unsigned(ComputeObjectAddressNode.get(buf, arrayBaseOffset(JavaKind.Byte) + off));
84        return updateBytesCRC32(UPDATE_BYTES_CRC32, crc, bufAddr, len);
85    }
86
87    @MethodSubstitution(optional = true)
88    static int updateByteBuffer(int crc, long addr, int off, int len) {
89        Word bufAddr = Word.unsigned(addr).add(off);
90        return updateBytesCRC32(UPDATE_BYTES_CRC32, crc, bufAddr, len);
91    }
92
93    /**
94     * @since 9
95     */
96    @MethodSubstitution(optional = true)
97    static int updateByteBuffer0(int crc, long addr, int off, int len) {
98        Word bufAddr = Word.unsigned(addr).add(off);
99        return updateBytesCRC32(UPDATE_BYTES_CRC32, crc, bufAddr, len);
100    }
101
102    public static final ForeignCallDescriptor UPDATE_BYTES_CRC32 = new ForeignCallDescriptor("updateBytesCRC32", int.class, int.class, Word.class, int.class);
103
104    @NodeIntrinsic(ForeignCallNode.class)
105    public static native int updateBytesCRC32(@ConstantNodeParameter ForeignCallDescriptor descriptor, int crc, Word buf, int length);
106}
107