Mercurial > hg > truffle
annotate graal/com.oracle.max.asmdis/src/com/sun/max/asm/Label.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) 2007, 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 com.sun.max.program.*; |
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26 |
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27 /** |
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28 * Assembler labels for symbolic addressing. |
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29 * |
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30 * This class provides combined functionality for both 32-bit and 64-bit address spaces. |
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31 * The respective assembler narrows the usable interface to either. |
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32 * |
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33 * @see Assembler32 |
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34 * @see Assembler64 |
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35 */ |
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36 public final class Label implements Argument { |
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37 |
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38 public enum State { |
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39 UNASSIGNED, BOUND, FIXED_32, FIXED_64; |
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40 } |
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41 |
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42 protected State state = State.UNASSIGNED; |
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43 |
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44 public static Label createBoundLabel(int position) { |
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45 final Label label = new Label(); |
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46 label.bind(position); |
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47 return label; |
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48 } |
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49 |
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50 public Label() { |
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51 } |
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52 |
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53 public State state() { |
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54 return state; |
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55 } |
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56 |
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57 private int position; |
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58 |
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59 /** |
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60 * Must only be called when the label is bound! |
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61 */ |
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62 public int position() throws AssemblyException { |
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63 if (state != State.BOUND) { |
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64 throw new AssemblyException("unassigned or unbound label"); |
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65 } |
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66 return position; |
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67 } |
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68 |
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69 /** |
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70 * Binds this label to a position in the assembler's instruction stream that represents the start of an instruction. |
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71 * The assembler may update the position if any emitted instructions change lengths, so that this label keeps |
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72 * denoting the same logical instruction. |
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73 * |
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74 * Only to be called by {@link Assembler#bindLabel(Label)}. |
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75 * |
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76 * @param pos |
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77 * an instruction's position in the assembler's instruction stream |
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78 * |
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79 * @see Assembler#bindLabel(Label) |
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80 */ |
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81 void bind(int pos) { |
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82 this.position = pos; |
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83 state = State.BOUND; |
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84 } |
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85 |
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86 void adjust(int delta) { |
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87 assert state == State.BOUND; |
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88 position += delta; |
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89 } |
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90 |
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91 private int address32; |
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92 private long address64; |
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93 |
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94 /** |
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95 * Assigns a fixed, absolute 32-bit address to this label. |
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96 * If used in a 64-bit assembler, |
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97 * the effective address value would be unsigned-extended. |
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98 * |
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99 * @param address an absolute memory location |
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100 * |
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101 * @see Assembler#bindLabel(Label) |
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102 */ |
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103 void fix32(int addr32) { |
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104 this.address32 = addr32; |
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105 state = State.FIXED_32; |
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106 } |
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107 |
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108 /** |
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109 * Assigns a fixed, absolute 64-bit address to this label. |
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110 * |
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111 * @param address an absolute memory location |
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112 * |
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113 * @see Assembler#bindLabel(Label) |
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114 */ |
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115 void fix64(long addr64) { |
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116 this.address64 = addr64; |
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117 state = State.FIXED_64; |
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118 } |
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119 |
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120 /** |
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121 * Must only be called if this label has been {@link #fix32 fixed}. |
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122 */ |
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123 public int address32() throws AssemblyException { |
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124 switch (state) { |
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125 case FIXED_32: { |
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126 return address32; |
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127 } |
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128 case FIXED_64: { |
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129 throw ProgramError.unexpected("64-bit address in 32-bit assembler"); |
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130 } |
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131 default: { |
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132 throw new AssemblyException("unassigned or unfixed label"); |
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133 } |
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134 } |
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135 } |
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136 |
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137 /** |
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138 * Must only be called if this label has been {@link #fix64 fixed}. |
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139 */ |
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140 public long address64() throws AssemblyException { |
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141 switch (state) { |
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142 case FIXED_64: { |
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143 return address64; |
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144 } |
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145 case FIXED_32: { |
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146 throw ProgramError.unexpected("32-bit address in 64-bit assembler"); |
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147 } |
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148 default: { |
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149 throw new AssemblyException("unassigned or unfixed label"); |
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150 } |
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151 } |
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152 } |
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153 |
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154 public String externalValue() { |
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155 throw ProgramError.unexpected(); |
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156 } |
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157 |
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158 public String disassembledValue() { |
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159 throw ProgramError.unexpected(); |
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160 } |
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161 |
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162 public long asLong() { |
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163 throw ProgramError.unexpected("unimplemented"); |
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164 } |
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165 |
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166 @Override |
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167 public boolean equals(Object other) { |
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168 if (other instanceof Label) { |
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169 final Label label = (Label) other; |
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170 if (state != label.state) { |
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171 return false; |
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172 } |
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173 switch (state) { |
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174 case UNASSIGNED: |
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175 return this == label; |
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176 case BOUND: |
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177 return position == label.position; |
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178 case FIXED_32: |
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179 return address32 == label.address32; |
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180 case FIXED_64: |
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181 return address64 == label.address64; |
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182 default: |
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183 throw ProgramError.unexpected(); |
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184 } |
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185 } |
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186 return false; |
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187 } |
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188 |
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189 @Override |
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190 public int hashCode() { |
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191 switch (state) { |
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192 case BOUND: |
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193 return position; |
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194 case FIXED_32: |
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195 return address32; |
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196 case FIXED_64: |
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197 return (int) (address64 ^ (address64 >> 32)); |
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198 default: |
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199 return super.hashCode(); |
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200 } |
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201 } |
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202 |
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203 @Override |
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204 public String toString() { |
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205 switch (state) { |
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206 case UNASSIGNED: |
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207 return "<unassigned>"; |
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208 case BOUND: |
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209 return position >= 0 ? "+" + position : String.valueOf(position); |
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210 case FIXED_32: |
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211 return String.valueOf(address32); |
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212 case FIXED_64: |
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213 return String.valueOf(address64); |
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214 default: |
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215 throw ProgramError.unexpected(); |
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parents:
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|
216 } |
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parents:
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217 } |
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218 } |