Mercurial > hg > graal-jvmci-8
annotate graal/com.oracle.graal.asm/src/com/oracle/graal/asm/Buffer.java @ 12467:b7fd9efe24c5
prevent npe in Buffer.copyData() when Buffer.data is null
author | Doug Simon <doug.simon@oracle.com> |
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date | Thu, 17 Oct 2013 11:46:27 +0200 |
parents | 0fb4d10bd256 |
children | 073e4d6cd3dd |
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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.oracle.graal.asm; |
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24 |
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25 import java.util.*; |
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26 |
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27 /** |
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28 * Code buffer management for the assembler. Support for little endian and big endian architectures |
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29 * is implemented using subclasses. |
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30 */ |
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31 public abstract class Buffer { |
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32 |
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33 protected byte[] data; |
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34 protected int position; |
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35 |
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36 public Buffer() { |
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37 data = new byte[AsmOptions.InitialCodeBufferSize]; |
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38 } |
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39 |
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40 public int position() { |
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41 return position; |
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42 } |
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43 |
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44 public void setPosition(int position) { |
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45 assert position >= 0 && position <= data.length; |
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46 this.position = position; |
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47 } |
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48 |
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49 /** |
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50 * Closes this buffer. No extra data can be written to this buffer after this call. |
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51 * |
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52 * @param trimmedCopy if {@code true}, then a copy of the underlying byte array up to (but not |
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53 * including) {@code position()} is returned |
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54 * @return the data in this buffer or a trimmed copy if {@code trimmedCopy} is {@code true} |
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55 */ |
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56 public byte[] close(boolean trimmedCopy) { |
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57 byte[] result = trimmedCopy ? Arrays.copyOf(data, position()) : data; |
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58 data = null; |
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59 position = 0; |
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60 return result; |
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61 } |
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62 |
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63 public byte[] copyData(int start, int end) { |
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64 if (data == null) { |
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65 return null; |
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66 } |
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67 return Arrays.copyOfRange(data, start, end); |
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68 } |
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69 |
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70 /** |
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71 * Copies the data from this buffer into a given array. |
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72 * |
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73 * @param dst the destination array |
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74 * @param off starting position in {@code dst} |
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75 * @param len number of bytes to copy |
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76 */ |
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77 public void copyInto(byte[] dst, int off, int len) { |
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78 System.arraycopy(data, 0, dst, off, len); |
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79 } |
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80 |
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81 protected void ensureSize(int length) { |
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82 if (length >= data.length) { |
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83 data = Arrays.copyOf(data, length * 4); |
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84 } |
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85 } |
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86 |
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87 public void emitBytes(byte[] arr, int off, int len) { |
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88 ensureSize(position + len); |
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89 System.arraycopy(arr, off, data, position, len); |
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90 position += len; |
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91 } |
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92 |
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93 public void emitByte(int b) { |
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94 position = emitByte(b, position); |
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95 } |
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96 |
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97 public void emitShort(int b) { |
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98 position = emitShort(b, position); |
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99 } |
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100 |
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101 public void emitInt(int b) { |
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102 position = emitInt(b, position); |
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103 } |
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104 |
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105 public void emitLong(long b) { |
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106 position = emitLong(b, position); |
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107 } |
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108 |
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109 private static final String NEWLINE = System.getProperty("line.separator"); |
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110 |
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111 public void emitString(String s) { |
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112 position = emitString("\t", position); // XXX REMOVE ME pretty-printing |
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113 position = emitString(s, position); |
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114 position = emitString(NEWLINE, position); |
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115 } |
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116 |
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117 // XXX for pretty-printing |
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118 public void emitString0(String s) { |
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119 emitBytes(s.getBytes(), 0, s.length()); |
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120 } |
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121 |
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122 public int emitBytes(byte[] arr, int pos) { |
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123 final int len = arr.length; |
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124 final int newPos = pos + len; |
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125 ensureSize(newPos); |
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126 System.arraycopy(arr, 0, data, pos, len); |
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127 return newPos; |
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128 } |
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129 |
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130 public int emitByte(int b, int pos) { |
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131 assert NumUtil.isUByte(b); |
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132 int newPos = pos + 1; |
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133 ensureSize(newPos); |
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134 data[pos] = (byte) (b & 0xFF); |
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135 return newPos; |
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136 } |
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137 |
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138 public abstract int emitShort(int b, int pos); |
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139 |
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140 public abstract int emitInt(int b, int pos); |
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141 |
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142 public abstract int emitLong(long b, int pos); |
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143 |
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144 public int emitString(String s, int pos) { |
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145 return emitBytes(s.getBytes(), pos); |
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146 } |
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147 |
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148 public int getByte(int pos) { |
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149 return data[pos] & 0xff; |
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150 } |
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151 |
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152 public abstract int getShort(int pos); |
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153 |
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154 public abstract int getInt(int pos); |
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155 |
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156 public static final class BigEndian extends Buffer { |
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157 |
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158 @Override |
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159 public int emitShort(int b, int pos) { |
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160 assert NumUtil.isUShort(b); |
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161 int newPos = pos + 2; |
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162 ensureSize(pos + 2); |
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163 data[pos] = (byte) ((b >> 8) & 0xFF); |
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164 data[pos + 1] = (byte) (b & 0xFF); |
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165 return newPos; |
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166 } |
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167 |
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168 @Override |
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169 public int emitInt(int b, int pos) { |
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170 int newPos = pos + 4; |
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171 ensureSize(newPos); |
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172 data[pos] = (byte) ((b >> 24) & 0xFF); |
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173 data[pos + 1] = (byte) ((b >> 16) & 0xFF); |
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174 data[pos + 2] = (byte) ((b >> 8) & 0xFF); |
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175 data[pos + 3] = (byte) (b & 0xFF); |
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176 return newPos; |
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177 } |
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178 |
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179 @Override |
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180 public int emitLong(long b, int pos) { |
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181 int newPos = pos + 8; |
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182 ensureSize(newPos); |
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183 data[pos] = (byte) ((b >> 56) & 0xFF); |
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184 data[pos + 1] = (byte) ((b >> 48) & 0xFF); |
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185 data[pos + 2] = (byte) ((b >> 40) & 0xFF); |
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186 data[pos + 3] = (byte) ((b >> 32) & 0xFF); |
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187 data[pos + 4] = (byte) ((b >> 24) & 0xFF); |
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188 data[pos + 5] = (byte) ((b >> 16) & 0xFF); |
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189 data[pos + 6] = (byte) ((b >> 8) & 0xFF); |
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190 data[pos + 7] = (byte) (b & 0xFF); |
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191 return newPos; |
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192 } |
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193 |
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194 @Override |
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195 public int getShort(int pos) { |
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196 return (data[pos + 0] & 0xff) << 8 | (data[pos + 1] & 0xff) << 0; |
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197 } |
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198 |
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199 @Override |
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200 public int getInt(int pos) { |
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201 return (data[pos + 0] & 0xff) << 24 | (data[pos + 1] & 0xff) << 16 | (data[pos + 2] & 0xff) << 8 | (data[pos + 3] & 0xff) << 0; |
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202 } |
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203 } |
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204 |
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205 public static final class LittleEndian extends Buffer { |
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206 |
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207 @Override |
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208 public int emitShort(int b, int pos) { |
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209 assert NumUtil.isUShort(b); |
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210 int newPos = pos + 2; |
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211 ensureSize(newPos); |
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212 data[pos] = (byte) (b & 0xFF); |
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213 data[pos + 1] = (byte) ((b >> 8) & 0xFF); |
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214 return newPos; |
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215 } |
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216 |
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217 @Override |
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218 public int emitInt(int b, int pos) { |
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219 int newPos = pos + 4; |
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220 ensureSize(newPos); |
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221 data[pos] = (byte) (b & 0xFF); |
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222 data[pos + 1] = (byte) ((b >> 8) & 0xFF); |
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223 data[pos + 2] = (byte) ((b >> 16) & 0xFF); |
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224 data[pos + 3] = (byte) ((b >> 24) & 0xFF); |
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225 return newPos; |
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226 } |
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227 |
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228 @Override |
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229 public int emitLong(long b, int pos) { |
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230 int newPos = pos + 8; |
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231 ensureSize(newPos); |
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232 data[pos] = (byte) (b & 0xFF); |
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233 data[pos + 1] = (byte) ((b >> 8) & 0xFF); |
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234 data[pos + 2] = (byte) ((b >> 16) & 0xFF); |
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235 data[pos + 3] = (byte) ((b >> 24) & 0xFF); |
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236 data[pos + 4] = (byte) ((b >> 32) & 0xFF); |
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237 data[pos + 5] = (byte) ((b >> 40) & 0xFF); |
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238 data[pos + 6] = (byte) ((b >> 48) & 0xFF); |
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239 data[pos + 7] = (byte) ((b >> 56) & 0xFF); |
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Adjust code base to new level of warnings.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
3733
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240 return newPos; |
3733
e233f5660da4
Added Java files from Maxine project.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
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241 } |
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Added Java files from Maxine project.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
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242 |
e233f5660da4
Added Java files from Maxine project.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
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243 @Override |
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parents:
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244 public int getShort(int pos) { |
7530
5e3d1a68664e
applied mx eclipseformat to all Java files
Doug Simon <doug.simon@oracle.com>
parents:
6531
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245 return (data[pos + 1] & 0xff) << 8 | (data[pos + 0] & 0xff) << 0; |
3733
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Added Java files from Maxine project.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
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246 } |
e233f5660da4
Added Java files from Maxine project.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
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247 |
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Added Java files from Maxine project.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
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248 @Override |
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Added Java files from Maxine project.
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parents:
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249 public int getInt(int pos) { |
7530
5e3d1a68664e
applied mx eclipseformat to all Java files
Doug Simon <doug.simon@oracle.com>
parents:
6531
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250 return (data[pos + 3] & 0xff) << 24 | (data[pos + 2] & 0xff) << 16 | (data[pos + 1] & 0xff) << 8 | (data[pos + 0] & 0xff) << 0; |
3733
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Added Java files from Maxine project.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
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251 } |
e233f5660da4
Added Java files from Maxine project.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
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252 } |
e233f5660da4
Added Java files from Maxine project.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
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253 } |