Mercurial > hg > truffle
annotate graal/com.oracle.max.asm/src/com/oracle/max/asm/Buffer.java @ 5022:cbedef8b4d15
Merge
author | Christian Haeubl <christian.haeubl@oracle.com> |
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date | Sun, 04 Mar 2012 18:56:25 -0800 |
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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.max.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 is implemented using subclasses. |
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29 */ |
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30 public abstract class Buffer { |
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31 protected byte[] data; |
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32 protected int position; |
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33 |
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34 public Buffer() { |
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35 data = new byte[AsmOptions.InitialCodeBufferSize]; |
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36 } |
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37 |
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38 public void reset() { |
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39 position = 0; |
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40 } |
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41 |
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42 public int position() { |
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43 return position; |
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44 } |
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45 |
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46 public void setPosition(int position) { |
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47 assert position >= 0 && position <= data.length; |
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48 this.position = position; |
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49 } |
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50 |
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51 /** |
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52 * Closes this buffer. No extra data can be written to this buffer after |
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53 * this call. |
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54 * |
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55 * @param trimmedCopy |
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56 * if {@code true}, then a copy of the underlying byte array up |
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57 * to (but not including) {@code position()} is returned |
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58 * @return the data in this buffer or a trimmed copy if {@code trimmedCopy} |
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59 * is {@code true} |
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60 */ |
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61 public byte[] close(boolean trimmedCopy) { |
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62 byte[] result = trimmedCopy ? Arrays.copyOf(data, position()) : data; |
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63 data = null; |
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64 return result; |
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65 } |
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66 |
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67 public byte[] copyData(int start, int end) { |
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68 return Arrays.copyOfRange(data, start, end); |
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69 } |
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70 |
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71 /** |
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72 * Copies the data from this buffer into a given array. |
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73 * |
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74 * @param dst |
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75 * the destination array |
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76 * @param off |
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77 * starting position in {@code dst} |
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78 * @param len |
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79 * number of bytes to copy |
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80 */ |
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81 public void copyInto(byte[] dst, int off, int len) { |
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82 System.arraycopy(data, 0, dst, off, len); |
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83 } |
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84 |
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85 protected void ensureSize(int length) { |
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86 if (length >= data.length) { |
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87 data = Arrays.copyOf(data, length * 4); |
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88 } |
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89 } |
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90 |
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91 public void emitBytes(byte[] arr, int off, int len) { |
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92 ensureSize(position + len); |
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93 System.arraycopy(arr, off, data, position, len); |
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94 position += len; |
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95 } |
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96 |
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97 public void emitByte(int b) { |
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98 position = emitByte(b, position); |
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99 } |
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100 |
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101 public void emitShort(int b) { |
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102 position = emitShort(b, position); |
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103 } |
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104 |
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105 public void emitInt(int b) { |
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106 position = emitInt(b, position); |
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107 } |
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108 |
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109 public void emitLong(long b) { |
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110 position = emitLong(b, position); |
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111 } |
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112 |
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113 public int emitByte(int b, int pos) { |
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114 assert NumUtil.isUByte(b); |
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115 int newPos = pos + 1; |
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116 ensureSize(newPos); |
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117 data[pos] = (byte) (b & 0xFF); |
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118 return newPos; |
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119 } |
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120 |
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121 public abstract int emitShort(int b, int pos); |
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122 |
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123 public abstract int emitInt(int b, int pos); |
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124 |
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125 public abstract int emitLong(long b, int pos); |
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126 |
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127 public int getByte(int pos) { |
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128 return data[pos] & 0xff; |
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129 } |
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130 |
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131 public abstract int getShort(int pos); |
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132 |
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133 public abstract int getInt(int pos); |
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134 |
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135 public static final class BigEndian extends Buffer { |
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136 @Override |
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|
137 public int emitShort(int b, int pos) { |
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138 assert NumUtil.isUShort(b); |
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139 int newPos = pos + 2; |
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140 ensureSize(pos + 2); |
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141 data[pos] = (byte) ((b >> 8) & 0xFF); |
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142 data[pos + 1] = (byte) (b & 0xFF); |
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143 return newPos; |
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|
144 } |
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145 |
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|
146 @Override |
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147 public int emitInt(int b, int pos) { |
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148 int newPos = pos + 4; |
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149 ensureSize(newPos); |
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150 data[pos] = (byte) ((b >> 24) & 0xFF); |
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151 data[pos + 1] = (byte) ((b >> 16) & 0xFF); |
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152 data[pos + 2] = (byte) ((b >> 8) & 0xFF); |
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153 data[pos + 3] = (byte) (b & 0xFF); |
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154 return newPos; |
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155 } |
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156 |
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|
157 @Override |
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|
158 public int emitLong(long b, int pos) { |
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159 int newPos = pos + 8; |
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160 ensureSize(newPos); |
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161 data[pos] = (byte) ((b >> 56) & 0xFF); |
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162 data[pos + 1] = (byte) ((b >> 48) & 0xFF); |
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163 data[pos + 2] = (byte) ((b >> 40) & 0xFF); |
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164 data[pos + 3] = (byte) ((b >> 32) & 0xFF); |
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165 data[pos + 4] = (byte) ((b >> 24) & 0xFF); |
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166 data[pos + 5] = (byte) ((b >> 16) & 0xFF); |
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167 data[pos + 6] = (byte) ((b >> 8) & 0xFF); |
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168 data[pos + 7] = (byte) (b & 0xFF); |
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169 return newPos; |
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170 } |
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171 |
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|
172 @Override |
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173 public int getShort(int pos) { |
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|
174 return |
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175 (data[pos + 0] & 0xff) << 8 | |
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176 (data[pos + 1] & 0xff) << 0; |
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177 } |
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178 |
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179 @Override |
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180 public int getInt(int pos) { |
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181 return |
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182 (data[pos + 0] & 0xff) << 24 | |
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183 (data[pos + 1] & 0xff) << 16 | |
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184 (data[pos + 2] & 0xff) << 8 | |
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185 (data[pos + 3] & 0xff) << 0; |
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186 } |
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|
187 } |
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188 |
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|
189 public static final class LittleEndian extends Buffer { |
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|
190 @Override |
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|
191 public int emitShort(int b, int pos) { |
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|
192 assert NumUtil.isUShort(b); |
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193 int newPos = pos + 2; |
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194 ensureSize(newPos); |
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195 data[pos] = (byte) (b & 0xFF); |
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196 data[pos + 1] = (byte) ((b >> 8) & 0xFF); |
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|
197 return newPos; |
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|
198 } |
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|
199 |
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|
200 @Override |
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|
201 public int emitInt(int b, int pos) { |
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202 int newPos = pos + 4; |
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|
203 ensureSize(newPos); |
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|
204 data[pos] = (byte) (b & 0xFF); |
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|
205 data[pos + 1] = (byte) ((b >> 8) & 0xFF); |
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|
206 data[pos + 2] = (byte) ((b >> 16) & 0xFF); |
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|
207 data[pos + 3] = (byte) ((b >> 24) & 0xFF); |
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|
208 return newPos; |
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|
209 } |
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|
210 |
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diff
changeset
|
211 @Override |
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|
212 public int emitLong(long b, int pos) { |
4142
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|
213 int newPos = pos + 8; |
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|
214 ensureSize(newPos); |
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|
215 data[pos] = (byte) (b & 0xFF); |
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|
216 data[pos + 1] = (byte) ((b >> 8) & 0xFF); |
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|
217 data[pos + 2] = (byte) ((b >> 16) & 0xFF); |
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changeset
|
218 data[pos + 3] = (byte) ((b >> 24) & 0xFF); |
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|
219 data[pos + 4] = (byte) ((b >> 32) & 0xFF); |
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|
220 data[pos + 5] = (byte) ((b >> 40) & 0xFF); |
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|
221 data[pos + 6] = (byte) ((b >> 48) & 0xFF); |
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|
222 data[pos + 7] = (byte) ((b >> 56) & 0xFF); |
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|
223 return newPos; |
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|
224 } |
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|
225 |
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|
226 @Override |
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|
227 public int getShort(int pos) { |
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|
228 return |
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|
229 (data[pos + 1] & 0xff) << 8 | |
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|
230 (data[pos + 0] & 0xff) << 0; |
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parents:
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changeset
|
231 } |
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changeset
|
232 |
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parents:
diff
changeset
|
233 @Override |
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changeset
|
234 public int getInt(int pos) { |
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|
235 return |
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff
changeset
|
236 (data[pos + 3] & 0xff) << 24 | |
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff
changeset
|
237 (data[pos + 2] & 0xff) << 16 | |
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff
changeset
|
238 (data[pos + 1] & 0xff) << 8 | |
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changeset
|
239 (data[pos + 0] & 0xff) << 0; |
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parents:
diff
changeset
|
240 } |
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff
changeset
|
241 } |
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff
changeset
|
242 } |