Mercurial > hg > truffle

annotate graal/com.oracle.max.asmdis/src/com/sun/max/asm/Label.java @ 4235:23f41c48b19b

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Re-enabled Java cleaning in gate.
author Doug Simon <doug.simon@oracle.com>
date Fri, 06 Jan 2012 14:22:57 +0100
parents e233f5660da4
children
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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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parents:
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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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parents:
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168 if (other instanceof Label) {
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169 final Label label = (Label) other;
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parents:
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170 if (state != label.state) {
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parents:
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171 return false;
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parents:
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172 }
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
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173 switch (state) {
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
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174 case UNASSIGNED:
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
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175 return this == label;
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
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176 case BOUND:
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
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177 return position == label.position;
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
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178 case FIXED_32:
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
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179 return address32 == label.address32;
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
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180 case FIXED_64:
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
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181 return address64 == label.address64;
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parents:
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182 default:
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
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183 throw ProgramError.unexpected();
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parents:
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184 }
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
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185 }
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
186 return false;
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
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187 }
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
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188
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
189 @Override
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
190 public int hashCode() {
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
191 switch (state) {
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
192 case BOUND:
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
193 return position;
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
194 case FIXED_32:
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
195 return address32;
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
196 case FIXED_64:
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
197 return (int) (address64 ^ (address64 >> 32));
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
198 default:
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
199 return super.hashCode();
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
200 }
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
201 }
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
202
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
203 @Override
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
204 public String toString() {
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
205 switch (state) {
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
206 case UNASSIGNED:
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
207 return "<unassigned>";
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
208 case BOUND:
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
209 return position >= 0 ? "+" + position : String.valueOf(position);
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
210 case FIXED_32:
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
211 return String.valueOf(address32);
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
212 case FIXED_64:
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
213 return String.valueOf(address64);
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
214 default:
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
215 throw ProgramError.unexpected();
e233f5660da4 Added Java files from Maxine project.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
216 }
e233f5660da4 Added Java files from Maxine project.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
217 }
e233f5660da4 Added Java files from Maxine project.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
218 }