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 */ 23 package org.graalvm.compiler.hotspot.replacements; 24 25 import static org.graalvm.compiler.hotspot.replacements.HotSpotReplacementsUtil.arrayBaseOffset; 26 27 import java.util.zip.CRC32; 28 29 import org.graalvm.compiler.api.replacements.ClassSubstitution; 30 import org.graalvm.compiler.api.replacements.Fold; 31 import org.graalvm.compiler.api.replacements.Fold.InjectedParameter; 32 import org.graalvm.compiler.api.replacements.MethodSubstitution; 33 import org.graalvm.compiler.core.common.spi.ForeignCallDescriptor; 34 import org.graalvm.compiler.graph.Node.ConstantNodeParameter; 35 import org.graalvm.compiler.graph.Node.NodeIntrinsic; 36 import org.graalvm.compiler.hotspot.GraalHotSpotVMConfig; 37 import org.graalvm.compiler.hotspot.nodes.ComputeObjectAddressNode; 38 import org.graalvm.compiler.hotspot.nodes.GraalHotSpotVMConfigNode; 39 import org.graalvm.compiler.nodes.extended.ForeignCallNode; 40 import org.graalvm.compiler.word.Word; 41 42 import jdk.vm.ci.meta.JavaKind; 43 44 // JaCoCo Exclude 45 46 /** 47 * Substitutions for {@link CRC32}. 48 */ 49 @ClassSubstitution(CRC32.class) 50 public 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 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 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 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 }