Mercurial > hg > truffle
annotate graal/com.oracle.max.asmdis/src/com/sun/max/asm/InlineDataDescriptor.java @ 3733:e233f5660da4
Added Java files from Maxine project.
author | Thomas Wuerthinger <thomas.wuerthinger@oracle.com> |
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date | Sat, 17 Dec 2011 19:59:18 +0100 |
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1 /* |
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2 * Copyright (c) 2008, 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.max.asm; |
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24 |
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25 import java.io.*; |
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26 import java.util.*; |
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27 |
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28 import com.sun.max.asm.Label.*; |
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29 import com.sun.max.program.*; |
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30 |
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31 /** |
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32 * A description of the structure of some (contiguous) inline data encoded in an instruction stream. |
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33 * |
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34 * A sequence of inline data descriptors can be encoded as a byte array which can later be used to guide the decoding or |
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35 * disassembling of the associated instruction stream. |
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36 */ |
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37 public abstract class InlineDataDescriptor implements Comparable<InlineDataDescriptor> { |
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38 |
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39 /** |
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40 * Constants for the supported types of inline data. |
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41 */ |
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42 public enum Tag { |
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43 /** |
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44 * @see ByteData |
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45 */ |
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46 BYTE_DATA { |
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47 @Override |
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48 public InlineDataDescriptor decode(DataInputStream dataInputStream) throws IOException { |
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49 return new ByteData(dataInputStream); |
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50 } |
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51 }, |
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52 |
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53 /** |
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54 * @see Ascii |
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55 */ |
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56 ASCII { |
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57 @Override |
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58 public InlineDataDescriptor decode(DataInputStream dataInputStream) throws IOException { |
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59 return new Ascii(dataInputStream); |
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60 } |
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61 }, |
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62 |
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63 /** |
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64 * @see JumpTable32 |
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65 */ |
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66 JUMP_TABLE32 { |
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67 @Override |
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68 public InlineDataDescriptor decode(DataInputStream dataInputStream) throws IOException { |
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69 return new JumpTable32(dataInputStream); |
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70 } |
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71 }, |
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72 |
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73 /** |
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74 * @see LookupTable32 |
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75 */ |
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76 LOOKUP_TABLE32 { |
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77 @Override |
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78 public InlineDataDescriptor decode(DataInputStream dataInputStream) throws IOException { |
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79 return new LookupTable32(dataInputStream); |
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80 } |
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81 }; |
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82 |
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83 /** |
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84 * Decodes an inline data descriptor from a given stream from which a byte corresponding |
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85 * to this tag's ordinal was just read. That is, this method decodes the inline data descriptor |
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86 * associated with this tag. |
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87 */ |
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88 public abstract InlineDataDescriptor decode(DataInputStream dataInputStream) throws IOException; |
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89 |
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90 public static final List<Tag> VALUES = Arrays.asList(values()); |
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91 } |
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92 |
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93 /** |
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94 * Gets the tag denoting the type of this inline data descriptor. |
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95 */ |
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96 public abstract Tag tag(); |
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97 |
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98 /** |
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99 * Gets the position in the instruction stream at which the inline data described by this descriptor starts. |
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100 * |
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101 * This method should not be called until the associated instruction stream has |
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102 * been completely encoded and fixed up. Until then, the final position of the |
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103 * inline data described by this descriptor may not have been established. |
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104 */ |
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105 public abstract int startPosition(); |
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106 |
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107 /** |
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108 * Gets the position in the instruction stream one byte past the inline data described by this descriptor. |
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109 * |
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110 * This method should not be called until the associated instruction stream has |
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111 * been completely encoded and fixed up. Until then, the final position of the |
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112 * inline data described by this descriptor may not have been established. |
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113 */ |
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114 public int endPosition() { |
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115 return startPosition() + size(); |
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116 } |
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117 |
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118 /** |
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119 * Gets the number of bytes of inline data described by this descriptor. |
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120 */ |
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121 public abstract int size(); |
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122 |
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123 public final void writeTo(DataOutputStream dataOutputStream) throws IOException { |
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124 dataOutputStream.writeByte(tag().ordinal()); |
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125 writeBody(dataOutputStream); |
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126 } |
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127 |
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128 protected abstract void writeBody(DataOutputStream dataOutputStream) throws IOException; |
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129 |
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130 /** |
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131 * Compares this descriptor with another for order. The order imposed by this method sorts descriptors in ascending |
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132 * order according to their {@linkplain #startPosition() start} positions. If instruction stream range of two |
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133 * descriptors overlap, then exactly one of the descriptors must describe unstructured {@linkplain ByteData byte |
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134 * data} which will come later in the sort order. |
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135 */ |
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136 public int compareTo(InlineDataDescriptor other) { |
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137 if (this == other) { |
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138 return 0; |
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139 } |
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140 |
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141 final int thisStart = startPosition(); |
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142 final int otherStart = other.startPosition(); |
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143 if (thisStart < otherStart) { |
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144 return -1; |
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145 } |
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146 if (thisStart > otherStart) { |
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147 return 1; |
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148 } |
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149 if (this instanceof ByteData) { |
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150 assert !(other instanceof ByteData) : "Inline data segments can only overlap if exactly one is a raw inline data segment"; |
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151 // Non-raw data sorts first |
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152 return 1; |
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153 } |
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154 assert other instanceof ByteData : "Inline data segments can only overlap if exactly one is a raw inline data segment"; |
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155 // Non-raw data sorts first |
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156 return -1; |
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157 } |
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158 |
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159 @Override |
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160 public String toString() { |
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161 return getClass().getSimpleName(); |
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162 } |
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163 |
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164 /** |
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165 * Describes an unstructured sequence of non-code bytes in an instruction stream. |
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166 */ |
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167 public static class ByteData extends InlineDataDescriptor { |
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168 private final Label startPosition; |
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169 private final int size; |
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170 |
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171 public ByteData(Label startPosition, int size) { |
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172 this.startPosition = startPosition; |
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173 this.size = size; |
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174 } |
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175 |
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176 public ByteData(int startPosition, int size) { |
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177 this(Label.createBoundLabel(startPosition), size); |
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178 } |
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179 |
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180 public ByteData(DataInputStream dataInputStream) throws IOException { |
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181 startPosition = new Label(); |
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182 startPosition.bind(dataInputStream.readInt()); |
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183 size = dataInputStream.readInt(); |
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184 } |
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185 |
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186 @Override |
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187 public void writeBody(DataOutputStream dataOutputStream) throws IOException { |
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188 dataOutputStream.writeInt(startPosition()); |
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189 dataOutputStream.writeInt(size); |
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190 } |
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191 |
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192 @Override |
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193 public int size() { |
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194 return size; |
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195 } |
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196 |
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197 @Override |
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198 public int startPosition() { |
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199 try { |
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200 return startPosition.position(); |
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201 } catch (AssemblyException assemblyException) { |
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202 throw ProgramError.unexpected("Cannot get start position of " + getClass().getSimpleName() + " until labels have been fixed", assemblyException); |
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203 } |
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204 } |
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205 |
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206 @Override |
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207 public Tag tag() { |
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208 return Tag.BYTE_DATA; |
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209 } |
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210 |
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211 @Override |
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212 public String toString() { |
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213 return super.toString() + "[start=" + startPosition() + ", size=" + size() + "]"; |
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214 } |
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215 } |
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216 |
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217 public static class Ascii extends ByteData { |
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218 |
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219 public Ascii(DataInputStream dataInputStream) throws IOException { |
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220 super(dataInputStream); |
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221 } |
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222 |
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223 public Ascii(int startPosition, int size) { |
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224 super(startPosition, size); |
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225 } |
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226 |
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227 public Ascii(Label startPosition, int size) { |
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228 super(startPosition, size); |
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229 } |
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230 |
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231 @Override |
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232 public Tag tag() { |
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233 return Tag.ASCII; |
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234 } |
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235 } |
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236 |
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237 /** |
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238 * Describes a table of 32 bit offsets. This type of table is usually used when translating a construct for |
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239 * transferring control to a number of code locations based on a key value from a dense value set (e.g. the {@code |
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240 * tableswitch} JVM instruction). The offset in each table entry is relative to the address of the table. |
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241 * |
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242 * The table is indexed by the contiguous range of integers from {@linkplain #low low} to {@linkplain #high high} |
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243 * inclusive. The number of entries is given by the expression {@code high() - low() + 1}. |
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244 */ |
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245 public static final class JumpTable32 extends InlineDataDescriptor { |
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246 private final Label tablePosition; |
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247 private final int low; |
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248 private final int high; |
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249 |
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250 public JumpTable32(int tablePosition, int low, int high) { |
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251 this(Label.createBoundLabel(tablePosition), low, high); |
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252 } |
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253 |
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254 public JumpTable32(Label tablePosition, int low, int high) { |
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255 this.tablePosition = tablePosition; |
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256 this.low = low; |
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257 this.high = high; |
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258 } |
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259 |
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260 public JumpTable32(DataInputStream dataInputStream) throws IOException { |
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261 tablePosition = new Label(); |
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262 tablePosition.bind(dataInputStream.readInt()); |
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263 low = dataInputStream.readInt(); |
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264 high = dataInputStream.readInt(); |
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265 } |
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266 |
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267 @Override |
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268 public void writeBody(DataOutputStream dataOutputStream) throws IOException { |
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269 dataOutputStream.writeInt(startPosition()); |
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270 dataOutputStream.writeInt(low); |
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271 dataOutputStream.writeInt(high); |
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272 } |
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273 |
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274 public int numberOfEntries() { |
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275 return high - low + 1; |
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276 } |
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277 |
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278 @Override |
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279 public int size() { |
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280 return numberOfEntries() * 4; |
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281 } |
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282 |
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283 @Override |
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284 public int startPosition() { |
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285 try { |
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286 return tablePosition.position(); |
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287 } catch (AssemblyException assemblyException) { |
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288 throw ProgramError.unexpected("Cannot get start position of " + getClass().getSimpleName() + " until labels have been fixed", assemblyException); |
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289 } |
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290 } |
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291 |
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292 public int tablePosition() { |
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293 return startPosition(); |
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294 } |
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295 |
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296 @Override |
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297 public Tag tag() { |
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298 return Tag.JUMP_TABLE32; |
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299 } |
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300 |
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301 public int low() { |
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302 return low; |
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303 } |
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304 |
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305 public int high() { |
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306 return high; |
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307 } |
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308 |
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309 @Override |
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310 public String toString() { |
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311 final String start = tablePosition.state() != State.BOUND ? "?" : String.valueOf(startPosition()); |
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312 return super.toString() + "[start=" + start + ", size=" + size() + ", low=" + low + ", high=" + high + "]"; |
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313 } |
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314 } |
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315 |
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316 /** |
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317 * Describes a table of 32-bit value and offset pairs. The offset in each table entry is relative to the address of |
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318 * the table. |
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319 * |
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320 * This type of table is usually used when translating a language level construct for transferring control to a |
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321 * number of code locations based on a key value from a sparse value set (e.g. the {@code lookupswitch} JVM |
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322 * instruction). |
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323 */ |
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324 public static final class LookupTable32 extends InlineDataDescriptor { |
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325 private final Label tablePosition; |
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326 private final int numberOfEntries; |
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327 |
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328 public LookupTable32(int tablePosition, int numberOfEntries) { |
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329 this(Label.createBoundLabel(tablePosition), numberOfEntries); |
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330 } |
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331 |
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332 public LookupTable32(Label tablePosition, int numberOfEntries) { |
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333 this.tablePosition = tablePosition; |
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334 this.numberOfEntries = numberOfEntries; |
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335 } |
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336 |
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337 public LookupTable32(DataInputStream dataInputStream) throws IOException { |
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338 tablePosition = new Label(); |
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339 tablePosition.bind(dataInputStream.readInt()); |
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340 numberOfEntries = dataInputStream.readInt(); |
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341 } |
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342 |
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343 @Override |
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344 public void writeBody(DataOutputStream dataOutputStream) throws IOException { |
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345 dataOutputStream.writeInt(startPosition()); |
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346 dataOutputStream.writeInt(numberOfEntries); |
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347 } |
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348 |
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349 public int numberOfEntries() { |
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|
350 return numberOfEntries; |
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|
351 } |
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352 |
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|
353 @Override |
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354 public int size() { |
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|
355 return numberOfEntries() * 8; |
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|
356 } |
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|
357 |
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|
358 @Override |
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|
359 public int startPosition() { |
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|
360 try { |
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361 return tablePosition.position(); |
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|
362 } catch (AssemblyException assemblyException) { |
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|
363 throw ProgramError.unexpected("Cannot get start position of " + getClass().getSimpleName() + " until labels have been fixed", assemblyException); |
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|
364 } |
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|
365 } |
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366 |
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|
367 public int tablePosition() { |
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|
368 return startPosition(); |
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|
369 } |
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|
370 |
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|
371 @Override |
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|
372 public Tag tag() { |
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|
373 return Tag.LOOKUP_TABLE32; |
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|
374 } |
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|
375 |
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|
376 @Override |
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|
377 public String toString() { |
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|
378 final String start = tablePosition.state() != State.BOUND ? "?" : String.valueOf(startPosition()); |
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379 return super.toString() + "[start=" + start + ", size=" + size() + ", numberOfEntries=" + numberOfEntries + "]"; |
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|
380 } |
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|
381 } |
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382 } |