Mercurial > hg > graal-jvmci-8
annotate graal/com.oracle.jvmci.asm/src/com/oracle/jvmci/asm/Buffer.java @ 21708:6df25b1418be
moved com.oracle.asm.** to jvmci-util.jar (JBS:GRAAL-53)
author | Doug Simon <doug.simon@oracle.com> |
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date | Wed, 03 Jun 2015 18:06:44 +0200 |
parents | graal/com.oracle.graal.asm/src/com/oracle/graal/asm/Buffer.java@5a7b82c1514e |
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1 /* |
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2 * Copyright (c) 2009, 2014, 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.jvmci.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 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 return result; |
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60 } |
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61 |
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62 public byte[] copyData(int start, int end) { |
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63 if (data == null) { |
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64 return null; |
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65 } |
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66 return Arrays.copyOfRange(data, start, end); |
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67 } |
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68 |
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69 /** |
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70 * Copies the data from this buffer into a given array. |
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71 * |
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72 * @param dst the destination array |
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73 * @param off starting position in {@code dst} |
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74 * @param len number of bytes to copy |
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75 */ |
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76 public void copyInto(byte[] dst, int off, int len) { |
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77 System.arraycopy(data, 0, dst, off, len); |
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78 } |
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79 |
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80 protected void ensureSize(int length) { |
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81 if (length >= data.length) { |
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82 data = Arrays.copyOf(data, length * 4); |
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83 } |
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84 } |
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85 |
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86 public void emitBytes(byte[] arr, int off, int len) { |
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87 ensureSize(position + len); |
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88 System.arraycopy(arr, off, data, position, len); |
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89 position += len; |
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90 } |
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91 |
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92 public void emitByte(int b) { |
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93 position = emitByte(b, position); |
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94 } |
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95 |
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96 public void emitShort(int b) { |
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97 position = emitShort(b, position); |
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98 } |
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99 |
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100 public void emitInt(int b) { |
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101 position = emitInt(b, position); |
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102 } |
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103 |
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104 public void emitLong(long b) { |
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105 position = emitLong(b, position); |
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106 } |
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107 |
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108 public int emitBytes(byte[] arr, int pos) { |
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109 final int len = arr.length; |
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110 final int newPos = pos + len; |
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111 ensureSize(newPos); |
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112 System.arraycopy(arr, 0, data, pos, len); |
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113 return newPos; |
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114 } |
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115 |
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116 public int emitByte(int b, int pos) { |
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117 assert NumUtil.isUByte(b) || NumUtil.isByte(b); |
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118 int newPos = pos + 1; |
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119 ensureSize(newPos); |
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120 data[pos] = (byte) (b & 0xFF); |
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121 return newPos; |
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122 } |
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123 |
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124 public abstract int emitShort(int b, int pos); |
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125 |
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126 public abstract int emitInt(int b, int pos); |
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127 |
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128 public abstract int emitLong(long b, int pos); |
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129 |
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130 public int getByte(int pos) { |
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131 return data[pos] & 0xff; |
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132 } |
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133 |
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134 public abstract int getShort(int pos); |
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135 |
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136 public abstract int getInt(int pos); |
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137 |
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138 public static final class BigEndian extends Buffer { |
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139 |
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140 @Override |
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141 public int emitShort(int b, int pos) { |
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142 assert NumUtil.isUShort(b) || NumUtil.isShort(b); |
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143 int newPos = pos + 2; |
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144 ensureSize(pos + 2); |
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145 data[pos] = (byte) ((b >> 8) & 0xFF); |
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146 data[pos + 1] = (byte) (b & 0xFF); |
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147 return newPos; |
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148 } |
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149 |
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150 @Override |
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151 public int emitInt(int b, int pos) { |
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152 int newPos = pos + 4; |
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153 ensureSize(newPos); |
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154 data[pos] = (byte) ((b >> 24) & 0xFF); |
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155 data[pos + 1] = (byte) ((b >> 16) & 0xFF); |
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156 data[pos + 2] = (byte) ((b >> 8) & 0xFF); |
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157 data[pos + 3] = (byte) (b & 0xFF); |
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158 return newPos; |
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159 } |
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160 |
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|
161 @Override |
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162 public int emitLong(long b, int pos) { |
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163 int newPos = pos + 8; |
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164 ensureSize(newPos); |
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165 data[pos] = (byte) ((b >> 56) & 0xFF); |
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166 data[pos + 1] = (byte) ((b >> 48) & 0xFF); |
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167 data[pos + 2] = (byte) ((b >> 40) & 0xFF); |
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168 data[pos + 3] = (byte) ((b >> 32) & 0xFF); |
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169 data[pos + 4] = (byte) ((b >> 24) & 0xFF); |
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170 data[pos + 5] = (byte) ((b >> 16) & 0xFF); |
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171 data[pos + 6] = (byte) ((b >> 8) & 0xFF); |
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172 data[pos + 7] = (byte) (b & 0xFF); |
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173 return newPos; |
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174 } |
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175 |
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176 @Override |
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177 public int getShort(int pos) { |
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178 return (data[pos + 0] & 0xff) << 8 | (data[pos + 1] & 0xff) << 0; |
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179 } |
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180 |
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181 @Override |
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182 public int getInt(int pos) { |
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183 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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184 } |
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185 } |
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186 |
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187 public static final class LittleEndian extends Buffer { |
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188 |
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189 @Override |
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|
190 public int emitShort(int b, int pos) { |
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Allow signed values in Buffer.emit(Byte|Short).
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|
191 assert NumUtil.isUShort(b) || NumUtil.isShort(b); |
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192 int newPos = pos + 2; |
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193 ensureSize(newPos); |
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194 data[pos] = (byte) (b & 0xFF); |
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195 data[pos + 1] = (byte) ((b >> 8) & 0xFF); |
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196 return newPos; |
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197 } |
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198 |
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|
199 @Override |
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200 public int emitInt(int b, int pos) { |
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201 int newPos = pos + 4; |
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|
202 ensureSize(newPos); |
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|
203 data[pos] = (byte) (b & 0xFF); |
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204 data[pos + 1] = (byte) ((b >> 8) & 0xFF); |
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205 data[pos + 2] = (byte) ((b >> 16) & 0xFF); |
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|
206 data[pos + 3] = (byte) ((b >> 24) & 0xFF); |
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207 return newPos; |
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208 } |
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209 |
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|
210 @Override |
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|
211 public int emitLong(long b, int pos) { |
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212 int newPos = pos + 8; |
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|
213 ensureSize(newPos); |
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|
214 data[pos] = (byte) (b & 0xFF); |
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|
215 data[pos + 1] = (byte) ((b >> 8) & 0xFF); |
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|
216 data[pos + 2] = (byte) ((b >> 16) & 0xFF); |
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|
217 data[pos + 3] = (byte) ((b >> 24) & 0xFF); |
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Adjust code base to new level of warnings.
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|
218 data[pos + 4] = (byte) ((b >> 32) & 0xFF); |
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|
219 data[pos + 5] = (byte) ((b >> 40) & 0xFF); |
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220 data[pos + 6] = (byte) ((b >> 48) & 0xFF); |
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|
221 data[pos + 7] = (byte) ((b >> 56) & 0xFF); |
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|
222 return newPos; |
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|
223 } |
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224 |
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|
225 @Override |
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|
226 public int getShort(int pos) { |
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227 return (data[pos + 1] & 0xff) << 8 | (data[pos + 0] & 0xff) << 0; |
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|
228 } |
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229 |
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|
230 @Override |
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|
231 public int getInt(int pos) { |
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|
232 return (data[pos + 3] & 0xff) << 24 | (data[pos + 2] & 0xff) << 16 | (data[pos + 1] & 0xff) << 8 | (data[pos + 0] & 0xff) << 0; |
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|
233 } |
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|
234 } |
17207
5a7b82c1514e
[SPARC] Add functionality to be able to do assembly in two passes (knowing offsets of forward branches)
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|
235 |
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|
236 public void reset() { |
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|
237 position = 0; |
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parents:
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Added Java files from Maxine project.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
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