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annotate graal/com.oracle.graal.compiler.common/src/com/oracle/graal/compiler/common/util/UnsafeArrayTypeWriter.java @ 20832:43b3db5e8a9e

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UnsafeArrayType(Writer|Reader): Use naturally aligned Unsafe access (Important for SPARC)
author Stefan Anzinger <stefan.anzinger@oracle.com>
date Thu, 09 Apr 2015 15:35:29 +0200
parents 5bf195ce816a
children 220ecaa0cc9b
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1 /*
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2 * Copyright (c) 2015, 2015, Oracle and/or its affiliates. All rights reserved.
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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4 *
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5 * This code is free software; you can redistribute it and/or modify it
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6 * under the terms of the GNU General Public License version 2 only, as
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7 * published by the Free Software Foundation.
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8 *
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9 * This code is distributed in the hope that it will be useful, but WITHOUT
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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12 * version 2 for more details (a copy is included in the LICENSE file that
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13 * accompanied this code).
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14 *
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15 * You should have received a copy of the GNU General Public License version
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16 * 2 along with this work; if not, write to the Free Software Foundation,
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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18 *
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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20 * or visit www.oracle.com if you need additional information or have any
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21 * questions.
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22 */
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23 package com.oracle.graal.compiler.common.util;
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24
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25 import static com.oracle.graal.compiler.common.util.TypeConversion.*;
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26
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27 import java.nio.*;
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28
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29 import sun.misc.*;
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30
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31 import com.oracle.graal.compiler.common.*;
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32
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33 /**
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34 * Provides low-level sequential write access to a byte[] array for signed and unsigned values of
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35 * size 1, 2, 4, and 8 bytes. To avoid copying an array when the buffer size is no longer
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36 * sufficient, the buffer is split into chunks of a fixed size.
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37 */
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38 public class UnsafeArrayTypeWriter implements TypeWriter {
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39
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40 private static final int CHUNK_SIZE = 4000;
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41
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42 static class Chunk {
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43 protected final byte[] data = new byte[CHUNK_SIZE];
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44 protected int size;
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45 protected Chunk next;
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46 }
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47
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48 private Chunk firstChunk;
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49 private Chunk writeChunk;
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50 private int totalSize;
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51
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52 public UnsafeArrayTypeWriter() {
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53 firstChunk = new Chunk();
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54 writeChunk = firstChunk;
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55 }
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56
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57 @Override
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58 public long getBytesWritten() {
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59 return totalSize;
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60 }
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61
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62 /**
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63 * Copies the buffer into the provided byte[] array of length {@link #getBytesWritten()}.
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64 */
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65 public byte[] toArray(byte[] result) {
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66 assert result.length == totalSize;
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67 int resultIdx = 0;
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68 for (Chunk cur = firstChunk; cur != null; cur = cur.next) {
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69 System.arraycopy(cur.data, 0, result, resultIdx, cur.size);
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70 resultIdx += cur.size;
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71 }
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72 assert resultIdx == totalSize;
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73 return result;
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74 }
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75
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76 @Override
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77 public void putS1(long value) {
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78 long offset = writeOffset(Byte.BYTES);
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79 UnsafeAccess.unsafe.putByte(writeChunk.data, offset, asS1(value));
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80 commitWrite(Byte.BYTES);
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81 }
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82
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83 @Override
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84 public void putU1(long value) {
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85 long offset = writeOffset(Byte.BYTES);
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86 UnsafeAccess.unsafe.putByte(writeChunk.data, offset, asU1(value));
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87 commitWrite(Byte.BYTES);
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88 }
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89
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90 @Override
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91 public void putS2(long value) {
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92 long offset = writeOffset(Short.BYTES);
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93 if (offset % Short.BYTES == 0) {
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94 UnsafeAccess.unsafe.putShort(writeChunk.data, offset, asS2(value));
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95 commitWrite(Short.BYTES);
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96 } else {
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97 ByteBuffer buf = ByteBuffer.wrap(new byte[Short.BYTES]);
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98 buf.putShort(asS2(value));
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99 putS1(buf.get(0));
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100 putS1(buf.get(Byte.BYTES));
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101 }
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102 }
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103
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104 @Override
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105 public void putU2(long value) {
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106 putS2(asU2(value));
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107 }
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108
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109 @Override
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110 public void putS4(long value) {
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111 long offset = writeOffset(Integer.BYTES);
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112 if (offset % Integer.BYTES == 0) {
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113 UnsafeAccess.unsafe.putInt(writeChunk.data, offset, asS4(value));
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114 commitWrite(Integer.BYTES);
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115 } else {
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116 ByteBuffer buf = ByteBuffer.wrap(new byte[Integer.BYTES]);
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117 buf.putInt(asS4(value));
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118 if (offset % Short.BYTES == 0) {
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119 putS2(buf.getShort(0));
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120 putS2(buf.getShort(2));
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121 } else {
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122 putS1(buf.get(0));
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123 putS2(buf.getShort(1));
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124 putS1(buf.get(3));
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125 }
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126 }
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127 }
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128
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129 @Override
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130 public void putU4(long value) {
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131 putS4(asU4(value));
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132 }
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133
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134 @Override
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135 public void putS8(long value) {
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136 long offset = writeOffset(Long.BYTES);
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137 if (offset % Long.BYTES == 0) {
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138 UnsafeAccess.unsafe.putLong(writeChunk.data, offset, value);
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139 commitWrite(Long.BYTES);
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140 } else {
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141 ByteBuffer buf = ByteBuffer.wrap(new byte[Long.BYTES]);
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142 buf.putLong(value);
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143 if (offset % Integer.BYTES == 0) {
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144 putS4(buf.getInt(0));
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145 putS4(buf.getInt(4));
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146 } else {
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147 putS2(buf.getShort(0));
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148 putS4(buf.getInt(2));
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149 putS2(buf.getShort(6));
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150 }
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151 }
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152 }
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153
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154 private long writeOffset(int writeBytes) {
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155 if (writeChunk.size + writeBytes >= writeChunk.data.length) {
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156 Chunk newChunk = new Chunk();
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157 writeChunk.next = newChunk;
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158 writeChunk = newChunk;
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159 }
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160
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161 assert Unsafe.ARRAY_BYTE_INDEX_SCALE == 1;
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162 long result = writeChunk.size + Unsafe.ARRAY_BYTE_BASE_OFFSET;
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163
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164 return result;
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165 }
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166
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167 private void commitWrite(int writeBytes) {
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168 totalSize += writeBytes;
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169 writeChunk.size += writeBytes;
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170 assert writeChunk.size <= writeChunk.data.length;
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171 }
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172 }