Mercurial > hg > truffle
annotate graal/GraalCompiler/src/com/sun/c1x/asm/Buffer.java @ 2653:7c8ad40c1f88
No need for stateAfter on volatile field loads.
author | Thomas Wuerthinger <thomas@wuerthinger.net> |
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date | Wed, 11 May 2011 15:11:33 +0200 |
parents | 16b9a8b5ad39 |
children |
rev | line source |
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2507
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1 /* |
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2 * Copyright (c) 2009, 2011, 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.sun.c1x.asm; |
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24 |
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25 import java.util.*; |
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26 |
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27 import com.sun.c1x.*; |
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28 import com.sun.cri.bytecode.*; |
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29 import com.sun.cri.ci.CiArchitecture.ByteOrder; |
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30 |
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31 /** |
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32 * |
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33 * @author Thomas Wuerthinger |
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34 */ |
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35 public final class Buffer { |
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36 |
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37 private byte[] data; |
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38 private int position; |
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39 private int mark = -1; |
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40 |
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41 private final ByteOrder byteOrder; |
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42 |
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43 public Buffer(ByteOrder byteOrder) { |
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44 this.byteOrder = byteOrder; |
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45 this.data = new byte[C1XOptions.InitialCodeBufferSize]; |
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46 } |
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47 |
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48 public void reset() { |
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49 position = 0; |
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50 mark = -1; |
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51 } |
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52 |
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53 /** |
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54 * Closes this buffer. No extra data can be written to this buffer after this call. |
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55 * |
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56 * @param trimmedCopy if {@code true}, then a copy of the underlying byte array up to (but not including) |
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57 * {@code position()} is returned |
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58 * @return the data in this buffer or a trimmed copy if {@code trimmedCopy} is {@code true} |
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59 */ |
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60 public byte[] close(boolean trimmedCopy) { |
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61 byte[] result = trimmedCopy ? Arrays.copyOf(data, position()) : data; |
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62 data = null; |
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63 return result; |
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64 } |
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65 |
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66 public int emitBytes(byte[] arr, int off, int len) { |
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67 assert data != null : "must not use buffer after calling finished!"; |
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68 int oldPos = position; |
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69 ensureSize(position + len); |
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70 System.arraycopy(arr, off, data, position, len); |
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71 position += len; |
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72 return oldPos; |
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73 } |
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74 |
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75 public int emitByte(int b) { |
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76 int oldPos = position; |
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77 position = emitByte(b, oldPos); |
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78 return oldPos; |
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79 } |
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80 |
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81 public int emitShort(int b) { |
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82 int oldPos = position; |
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83 position = emitShort(b, oldPos); |
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84 return oldPos; |
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85 } |
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86 |
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87 public int emitInt(int b) { |
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88 int oldPos = position; |
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89 position = emitInt(b, oldPos); |
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90 return oldPos; |
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91 } |
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92 |
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93 public int emitLong(long b) { |
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94 int oldPos = position; |
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95 position = emitLong(b, oldPos); |
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96 return oldPos; |
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97 } |
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98 |
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99 private boolean isByte(int b) { |
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100 return b == (b & 0xFF); |
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101 } |
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102 |
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103 private boolean isShort(int s) { |
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104 return s == (s & 0xFFFF); |
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105 } |
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106 |
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107 /** |
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108 * Places a bookmark at the {@linkplain #position() current position}. |
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109 * |
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110 * @return the previously placed bookmark or {@code -1} if there was no bookmark |
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111 */ |
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112 public int mark() { |
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113 int mark = this.mark; |
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114 this.mark = position; |
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115 return mark; |
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116 } |
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117 |
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118 private void ensureSize(int length) { |
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119 if (length >= data.length) { |
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120 data = Arrays.copyOf(data, data.length * 4); |
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121 C1XMetrics.CodeBufferCopies++; |
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122 } |
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123 } |
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124 |
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125 public int emitByte(int b, int pos) { |
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126 assert data != null : "must not use buffer after calling finished!"; |
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127 assert isByte(b); |
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128 ensureSize(pos + 1); |
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129 data[pos++] = (byte) b; |
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130 return pos; |
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131 } |
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132 |
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133 public int emitShort(int b, int pos) { |
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134 assert data != null : "must not use buffer after calling finished!"; |
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135 assert isShort(b); |
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136 ensureSize(pos + 2); |
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137 if (byteOrder == ByteOrder.BigEndian) { |
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138 data[pos++] = (byte) ((b >> 8) & 0xFF); |
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139 data[pos++] = (byte) (b & 0xFF); |
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140 |
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141 } else { |
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142 assert byteOrder == ByteOrder.LittleEndian; |
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143 data[pos++] = (byte) (b & 0xFF); |
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144 data[pos++] = (byte) ((b >> 8) & 0xFF); |
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145 } |
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146 return pos; |
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147 } |
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148 |
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149 public int emitInt(int b, int pos) { |
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150 assert data != null : "must not use buffer after calling finished!"; |
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151 ensureSize(pos + 4); |
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152 if (byteOrder == ByteOrder.BigEndian) { |
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153 data[pos++] = (byte) ((b >> 24) & 0xFF); |
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154 data[pos++] = (byte) ((b >> 16) & 0xFF); |
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155 data[pos++] = (byte) ((b >> 8) & 0xFF); |
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156 data[pos++] = (byte) (b & 0xFF); |
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157 } else { |
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158 assert byteOrder == ByteOrder.LittleEndian; |
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159 data[pos++] = (byte) (b & 0xFF); |
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160 data[pos++] = (byte) ((b >> 8) & 0xFF); |
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161 data[pos++] = (byte) ((b >> 16) & 0xFF); |
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162 data[pos++] = (byte) ((b >> 24) & 0xFF); |
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163 } |
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164 return pos; |
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165 } |
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166 |
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167 public int emitLong(long b, int pos) { |
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168 assert data != null : "must not use buffer after calling finished!"; |
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169 ensureSize(pos + 8); |
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170 |
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171 if (byteOrder == ByteOrder.BigEndian) { |
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172 data[pos++] = (byte) ((b >> 56) & 0xFF); |
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173 data[pos++] = (byte) ((b >> 48) & 0xFF); |
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174 data[pos++] = (byte) ((b >> 40) & 0xFF); |
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175 data[pos++] = (byte) ((b >> 32) & 0xFF); |
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176 data[pos++] = (byte) ((b >> 24) & 0xFF); |
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177 data[pos++] = (byte) ((b >> 16) & 0xFF); |
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178 data[pos++] = (byte) ((b >> 8) & 0xFF); |
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179 data[pos++] = (byte) (b & 0xFF); |
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180 } else { |
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181 assert byteOrder == ByteOrder.LittleEndian; |
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182 data[pos++] = (byte) (b & 0xFF); |
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183 data[pos++] = (byte) ((b >> 8) & 0xFF); |
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184 data[pos++] = (byte) ((b >> 16) & 0xFF); |
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185 data[pos++] = (byte) ((b >> 24) & 0xFF); |
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186 data[pos++] = (byte) ((b >> 32) & 0xFF); |
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187 data[pos++] = (byte) ((b >> 40) & 0xFF); |
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188 data[pos++] = (byte) ((b >> 48) & 0xFF); |
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189 data[pos++] = (byte) ((b >> 56) & 0xFF); |
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190 } |
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191 return pos; |
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192 } |
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193 |
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194 public int position() { |
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195 return position; |
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196 } |
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197 |
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198 public void setPosition(int position) { |
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199 assert position >= 0 && position <= data.length; |
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200 this.position = position; |
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201 } |
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202 |
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203 public int getByte(int pos) { |
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204 return Bytes.beU1(data, pos); |
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205 } |
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206 |
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207 public int getShort(int pos) { |
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208 if (byteOrder == ByteOrder.BigEndian) { |
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209 return |
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210 (data[pos + 0] & 0xff) << 8 | |
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211 (data[pos + 1] & 0xff) << 0; |
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212 } else { |
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213 assert byteOrder == ByteOrder.LittleEndian; |
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214 return |
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215 (data[pos + 1] & 0xff) << 8 | |
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216 (data[pos + 0] & 0xff) << 0; |
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217 } |
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218 } |
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219 |
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220 public int getInt(int pos) { |
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221 if (byteOrder == ByteOrder.BigEndian) { |
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222 return |
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223 (data[pos + 0] & 0xff) << 24 | |
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224 (data[pos + 1] & 0xff) << 16 | |
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225 (data[pos + 2] & 0xff) << 8 | |
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226 (data[pos + 3] & 0xff) << 0; |
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227 } else { |
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228 assert byteOrder == ByteOrder.LittleEndian; |
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229 return |
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230 (data[pos + 3] & 0xff) << 24 | |
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231 (data[pos + 2] & 0xff) << 16 | |
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232 (data[pos + 1] & 0xff) << 8 | |
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233 (data[pos + 0] & 0xff) << 0; |
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234 } |
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235 } |
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236 |
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237 public byte[] copyData(int start, int end) { |
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238 return Arrays.copyOfRange(data, start, end); |
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239 } |
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240 |
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241 /** |
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242 * Copies the data from this buffer into a given array. |
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243 * |
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244 * @param dst the destination array |
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245 * @param off starting position in {@code dst} |
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246 * @param len number of bytes to copy |
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247 */ |
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248 public void copyInto(byte[] dst, int off, int len) { |
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249 System.arraycopy(data, 0, dst, off, len); |
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250 } |
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251 } |