Mercurial > hg > truffle
annotate graal/com.oracle.max.asmdis/src/com/sun/max/asm/Assembler.java @ 4297:874fcc2ddd9d
Use HotSpot disassmblers for native code and bytecode
author | Christian Wimmer <christian.wimmer@oracle.com> |
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date | Wed, 18 Jan 2012 20:08:08 -0800 |
parents | bc8527f3071c |
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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 java.io.*; |
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26 import java.util.*; |
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27 |
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28 import com.sun.max.lang.*; |
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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 * Assembler base class. |
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33 */ |
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34 @SuppressWarnings("unused") |
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35 public abstract class Assembler { |
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36 |
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37 private final Directives directives; |
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38 |
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39 protected Assembler(byte byteData, boolean isValidCode) { |
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40 this.directives = new Directives(byteData, isValidCode); |
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41 } |
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42 |
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43 public abstract ISA isa(); |
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44 |
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45 public final Directives directives() { |
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46 return directives; |
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47 } |
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48 |
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49 /** |
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50 * Gets the width of a word on machine for which the code is being assembled. |
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51 */ |
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52 public abstract WordWidth wordWidth(); |
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53 |
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54 /** |
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55 * Resets any internal state in this assembler to the equivalent state it had when first constructed. |
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56 * <p> |
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57 * This method is overridden as needed to ensure the state in subclasses is reset as well. Any |
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58 * overriding implementation must call this method in its superclass. |
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59 */ |
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60 public Assembler reset() { |
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61 boundLabels.clear(); |
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62 assembledObjects.clear(); |
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63 mutableAssembledObjects.clear(); |
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64 padOutput = false; |
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65 potentialExpansionSize = 0; |
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66 selectingLabelInstructions = true; |
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67 stream.reset(); |
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68 if (this instanceof Assembler32) { |
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69 final Assembler32 assembler32 = (Assembler32) this; |
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70 assembler32.setStartAddress(0); |
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71 } else if (this instanceof Assembler64) { |
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72 final Assembler64 assembler64 = (Assembler64) this; |
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73 assembler64.setStartAddress(0); |
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74 } |
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75 return this; |
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76 } |
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77 |
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78 /** |
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79 * A facility for including output during assembly that may not necessarily be decoded interpreted as code. |
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80 * |
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81 */ |
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82 public final class Directives { |
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83 |
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84 private final byte padByte; |
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85 private final boolean isValidCode; |
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86 |
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87 public Directives(byte padByte, boolean isValidCode) { |
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88 this.padByte = padByte; |
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89 this.isValidCode = isValidCode; |
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90 } |
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91 /** |
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92 * Inserts as many {@linkplain #padByte pad bytes} as necessary to ensure that the next assembled object starts |
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93 * at an address aligned by a given number. |
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94 * |
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95 * @param alignment |
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96 * the next assembled object is guaranteed to start at the next highest address starting at the |
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97 * current address that is divisible by this value. Note that this computed address will be the |
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98 * current address if the current address is already aligned by {@code alignment} |
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99 */ |
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100 private void alignIfSpaceLeftSmallerThan(int alignment, int requiredSpace, int alignmentStart) { |
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101 final int startPosition = currentPosition(); |
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102 |
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103 // We avoid sign problems with '%' below by masking off the sign bit: |
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104 final long unsignedAddend = (baseAddress() + startPosition + alignmentStart) & Long.MAX_VALUE; |
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105 |
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106 final int misalignmentSize = (int) (unsignedAddend % alignment); |
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107 final int padSize = misalignmentSize > 0 ? (alignment - misalignmentSize) : 0; |
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108 for (int i = 0; i < padSize; i++) { |
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109 emitByte(padByte); |
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110 } |
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111 new AlignmentPadding(Assembler.this, startPosition, currentPosition(), alignment, alignmentStart, requiredSpace, padByte) { |
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112 public boolean isCode() { |
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113 return isValidCode; |
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114 } |
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115 }; |
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116 } |
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117 |
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118 public void align(int alignment) { |
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119 alignIfSpaceLeftSmallerThan(alignment, alignment, 0); |
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120 } |
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121 |
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122 /** |
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123 * Enforce that the next assembled object fits within an aligned chunk. |
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124 * The specified space required by the next assembled object must be smaller or equals to the specified alignment. If the object cannot fit in the current chunk, |
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125 * Inserts as many {@linkplain #padByte pad bytes} as necessary to ensure that the next assembled object starts |
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126 * at the next alignment. |
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127 * |
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128 * @param alignment |
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129 * the next assembled object is guaranteed to fit in within a block of memory whose starting address is the next |
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130 * address starting at the |
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131 * current address that is divisible by this value. |
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132 * @param requiredSpace size of the next assembled object; it must be smaller or equals to alignment |
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133 */ |
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134 public boolean align(int alignment, int requiredSpace) { |
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135 if (alignment < requiredSpace) { |
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136 return false; |
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137 } |
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138 alignIfSpaceLeftSmallerThan(alignment, requiredSpace, 0); |
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139 return true; |
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140 } |
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141 |
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142 /** |
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143 * Inserts as many {@linkplain #padByte pad bytes} as necessary to ensure that the nth byte within the next assembled object starts |
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144 * at an address aligned by a given number. |
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145 * @param alignment |
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146 * @param alignmentStart where the alignment should start within the next assembled object. |
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147 */ |
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148 public void alignAfter(int alignment, int alignmentStart) { |
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149 alignIfSpaceLeftSmallerThan(alignment, alignment, alignmentStart); |
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150 } |
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151 |
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152 public void inlineByte(byte byteValue) { |
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153 addInlineData(currentPosition(), Bytes.SIZE); |
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154 emitByte(byteValue); |
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155 } |
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156 |
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157 public void inlineByteArray(byte[] byteArrayValue) { |
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158 addInlineData(currentPosition(), byteArrayValue.length); |
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159 emitByteArray(byteArrayValue, 0, byteArrayValue.length); |
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160 } |
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161 |
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162 public void inlineByteArray(byte[] byteArrayValue, int offset, int length) { |
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163 addInlineData(currentPosition(), length); |
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164 emitByteArray(byteArrayValue, offset, length); |
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165 } |
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166 |
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167 public void inlineShort(short shortValue) { |
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168 addInlineData(currentPosition(), Shorts.SIZE); |
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169 emitShort(shortValue); |
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170 } |
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171 |
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172 public void inlineInt(int intValue) { |
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173 addInlineData(currentPosition(), Ints.SIZE); |
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174 emitInt(intValue); |
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175 } |
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176 |
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177 public void inlineLong(long longValue) { |
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178 addInlineData(currentPosition(), Longs.SIZE); |
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179 emitLong(longValue); |
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180 } |
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181 |
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182 /** |
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183 * Inlines the absolute address of a position (represented by a given label) in the assembled code. |
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184 * The absolute address is calculated as {@code baseAddress() + label.position()}. The size |
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185 * of the inlined address is determined by {@link Assembler#wordWidth()}. |
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186 * |
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187 * @param label the label whose absolute address is to be inlined |
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188 */ |
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189 public AddressLiteral inlineAddress(Label label) { |
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190 final int startPosition = currentPosition(); |
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191 // Emit placeholder bytes |
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192 final WordWidth width = wordWidth(); |
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193 for (int i = 0; i < width.numberOfBytes; i++) { |
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194 emitByte((byte) 0); |
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195 } |
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196 final AddressLiteral addressLiteral = new AddressLiteral(Assembler.this, startPosition, currentPosition(), label); |
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197 assert addressLiteral.size() == width.numberOfBytes; |
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198 return addressLiteral; |
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199 } |
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200 |
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201 /** |
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202 * Inlines the offset between two positions (represented by given labels) in the assembled code. |
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203 * |
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204 * @param base the label whose position marks the base of the offset |
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205 * @param target the label whose position marks the target of the offset |
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206 * @param width the fixed size to be used for the offset |
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207 */ |
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208 public OffsetLiteral inlineOffset(Label target, Label base, WordWidth width) { |
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209 final int startPosition = currentPosition(); |
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210 for (int i = 0; i < width.numberOfBytes; i++) { |
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211 emitByte((byte) 0); |
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|
212 } |
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213 final OffsetLiteral offsetLiteral = new OffsetLiteral(Assembler.this, startPosition, currentPosition(), target, base); |
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214 assert offsetLiteral.size() == width.numberOfBytes; |
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215 return offsetLiteral; |
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216 } |
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217 } |
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218 |
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219 /** |
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220 * Gets the number of bytes that have been written to the underlying output stream. |
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221 */ |
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222 public int currentPosition() { |
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223 return stream.size(); |
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224 } |
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225 |
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|
226 /** |
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227 * Gets the start address of the code assembled by this assembler. |
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228 */ |
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229 public abstract long baseAddress(); |
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230 |
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231 private ByteArrayOutputStream stream = new ByteArrayOutputStream(); |
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232 |
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233 protected void emitByte(int byteValue) { |
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|
234 stream.write(byteValue); |
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|
235 } |
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|
236 |
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|
237 protected void emitZeroes(int count) { |
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238 for (int i = 0; i < count; ++i) { |
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239 stream.write(0); |
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|
240 } |
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|
241 } |
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|
242 |
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|
243 protected abstract void emitShort(short shortValue); |
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244 |
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245 protected abstract void emitInt(int intValue); |
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246 |
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|
247 protected abstract void emitLong(long longValue); |
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248 |
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249 public void emitByteArray(byte[] byteArrayValue, int off, int len) { |
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|
250 stream.write(byteArrayValue, off, len); |
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251 } |
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252 |
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253 private boolean selectingLabelInstructions = true; |
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254 |
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255 boolean selectingLabelInstructions() { |
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256 return selectingLabelInstructions; |
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257 } |
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258 |
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259 private final Set<Label> boundLabels = Collections.newSetFromMap(new IdentityHashMap<Label, Boolean>()); |
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260 |
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261 public Set<Label> boundLabels() { |
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262 return boundLabels; |
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263 } |
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264 |
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265 /** |
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266 * Binds a given label to the current position in the assembler's instruction stream. The assembler may update the |
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267 * label's position if any emitted instructions change lengths, so that this label keeps addressing the same logical |
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268 * position. |
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269 * |
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270 * @param label |
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271 * the label that is to be bound to the current position |
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272 * |
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273 * @see Label#fix32 |
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274 */ |
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275 public final void bindLabel(Label label) { |
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276 label.bind(currentPosition()); |
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277 boundLabels.add(label); |
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278 } |
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279 |
4142
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280 private final List<AssembledObject> assembledObjects = new LinkedList<>(); |
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281 private final List<MutableAssembledObject> mutableAssembledObjects = new LinkedList<>(); |
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282 |
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283 private int potentialExpansionSize; |
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284 |
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285 /** |
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286 * Adds the description of an instruction that is fixed in size. |
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287 * |
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288 * @param fixedSizeAssembledObject |
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289 */ |
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290 void addFixedSizeAssembledObject(AssembledObject fixedSizeAssembledObject) { |
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291 assembledObjects.add(fixedSizeAssembledObject); |
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292 if (fixedSizeAssembledObject instanceof MutableAssembledObject) { |
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293 mutableAssembledObjects.add((MutableAssembledObject) fixedSizeAssembledObject); |
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294 } |
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295 } |
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296 |
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297 /** |
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298 * Adds the description of an instruction that can change in size, depending on where it is located in the |
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299 * instruction and/or where another object it addresses is located in the instruction stream. |
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300 * |
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301 * @param spanDependentInstruction |
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302 */ |
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303 void addSpanDependentInstruction(InstructionWithOffset spanDependentInstruction) { |
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304 assembledObjects.add(spanDependentInstruction); |
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305 mutableAssembledObjects.add(spanDependentInstruction); |
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306 // A span-dependent instruction's offset operand can potentially grow from 8 bits to 32 bits. |
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307 // Also, some instructions need an extra byte for encoding when not using an 8-bit operand. |
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308 // Together, this might enlarge every span-dependent label instruction by maximally 4 bytes. |
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309 potentialExpansionSize += 4; |
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310 } |
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311 |
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312 void addAlignmentPadding(AlignmentPadding alignmentPadding) { |
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313 assembledObjects.add(alignmentPadding); |
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314 mutableAssembledObjects.add(alignmentPadding); |
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315 potentialExpansionSize += alignmentPadding.alignment() - alignmentPadding.size(); |
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316 } |
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317 |
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318 void addInlineData(int startPosition, int size) { |
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319 assembledObjects.add(new AssembledObject(startPosition, startPosition + size) { |
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320 public boolean isCode() { |
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321 return false; |
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322 } |
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323 }); |
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324 } |
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325 |
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326 private void gatherLabels() throws AssemblyException { |
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327 for (AssembledObject assembledObject : assembledObjects) { |
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328 if (assembledObject instanceof InstructionWithLabel) { |
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329 final InstructionWithLabel labelInstruction = (InstructionWithLabel) assembledObject; |
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330 switch (labelInstruction.label().state()) { |
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331 case UNASSIGNED: |
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332 throw new AssemblyException("unassigned label"); |
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333 case BOUND: |
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334 boundLabels.add(labelInstruction.label()); |
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335 break; |
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336 default: |
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337 break; |
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338 } |
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339 } |
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340 } |
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341 } |
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342 |
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343 private boolean updateSpanDependentInstruction(InstructionWithOffset instruction) throws AssemblyException { |
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344 if (!instruction.updateLabelSize()) { |
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345 return false; |
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346 } |
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347 final int oldSize = instruction.size(); |
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348 final int oldEndPosition = instruction.endPosition(); |
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349 stream.reset(); |
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350 instruction.assemble(); |
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351 final int newSize = stream.toByteArray().length; |
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352 instruction.setSize(newSize); |
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353 final int delta = newSize - oldSize; |
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354 adjustMutableAssembledObjects(delta, oldEndPosition, null); |
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355 return true; |
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356 } |
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357 |
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358 private boolean updateAlignmentPadding(AlignmentPadding alignmentPadding) throws AssemblyException { |
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359 final int oldSize = alignmentPadding.size(); |
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360 final int oldEndPosition = alignmentPadding.endPosition(); |
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361 alignmentPadding.updatePadding(); |
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362 final int newSize = alignmentPadding.size(); |
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363 if (oldSize != newSize) { |
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364 // Only if the padding expanded will subsequent objects in the stream need to be adjusted |
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365 final int delta = newSize - oldSize; |
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366 adjustMutableAssembledObjects(delta, oldEndPosition, alignmentPadding); |
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367 return true; |
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368 } |
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369 return false; |
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|
370 } |
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371 |
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372 /** |
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373 * Adjusts the position of all the mutable objects that are currently at or after a given position. |
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374 * |
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375 * @param delta the amount by which the position of each mutable object is to be adjusted |
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376 * @param startPosition only mutable objects whose current {@linkplain AssembledObject#startPosition() start |
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377 * position} is equal to or greater than this value are adjusted |
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378 * @param adjustedPadding the padding object whose adjustment caused the need for this call. If this call was made |
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379 * for some other reason than having adjusted a padding object's size, then this value will be null. In this |
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parents:
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380 * value is not null, then its position will not be adjusted by this call. |
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381 */ |
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parents:
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382 private void adjustMutableAssembledObjects(int delta, int startPosition, AlignmentPadding adjustedPadding) throws AssemblyException { |
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parents:
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383 for (Label label : boundLabels) { |
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parents:
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|
384 if (label.position() >= startPosition) { |
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parents:
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|
385 label.adjust(delta); |
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parents:
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|
386 } |
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parents:
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|
387 } |
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parents:
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|
388 |
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389 for (MutableAssembledObject mutableAssembledObject : mutableAssembledObjects) { |
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parents:
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390 if (mutableAssembledObject != adjustedPadding && mutableAssembledObject.startPosition() >= startPosition) { |
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391 mutableAssembledObject.adjust(delta); |
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392 } |
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parents:
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393 } |
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parents:
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394 } |
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395 |
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396 private void updateSpanDependentVariableInstructions() throws AssemblyException { |
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397 boolean changed; |
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parents:
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398 do { |
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parents:
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399 changed = false; |
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parents:
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400 for (MutableAssembledObject mutableAssembledObject : mutableAssembledObjects) { |
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parents:
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401 if (mutableAssembledObject instanceof InstructionWithOffset) { |
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parents:
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402 changed |= updateSpanDependentInstruction((InstructionWithOffset) mutableAssembledObject); |
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403 } else if (mutableAssembledObject instanceof AlignmentPadding) { |
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parents:
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404 changed |= updateAlignmentPadding((AlignmentPadding) mutableAssembledObject); |
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
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405 } |
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parents:
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406 } |
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parents:
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407 } while (changed); |
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parents:
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|
408 } |
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parents:
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|
409 |
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parents:
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410 private int writeOutput(OutputStream outputStream, byte[] initialBytes, InlineDataRecorder inlineDataRecorder) throws IOException, AssemblyException { |
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|
411 selectingLabelInstructions = false; |
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
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412 int bytesWritten = 0; |
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
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413 try { |
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
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414 int initialOffset = 0; |
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parents:
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changeset
|
415 for (AssembledObject assembledObject : assembledObjects) { |
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parents:
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|
416 if (inlineDataRecorder != null && !assembledObject.isCode()) { |
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417 inlineDataRecorder.add(new InlineDataDescriptor.ByteData(assembledObject.startPosition(), assembledObject.size())); |
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418 } |
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|
419 |
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420 if (assembledObject instanceof MutableAssembledObject) { |
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421 final MutableAssembledObject mutableAssembledObject = (MutableAssembledObject) assembledObject; |
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|
422 |
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423 // Copy the original assembler output between the end of the last mutable assembled object and the start of the current one |
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424 final int length = mutableAssembledObject.initialStartPosition() - initialOffset; |
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425 outputStream.write(initialBytes, initialOffset, length); |
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426 bytesWritten += length; |
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|
427 |
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428 // Now (re)assemble the mutable assembled object |
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429 stream.reset(); |
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430 mutableAssembledObject.assemble(); |
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431 stream.writeTo(outputStream); |
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432 bytesWritten += stream.size(); |
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changeset
|
433 initialOffset = mutableAssembledObject.initialEndPosition(); |
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434 } else { |
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parents:
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|
435 // Copy the original assembler output between the end of the last assembled object and the end of current one |
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|
436 final int length = assembledObject.endPosition() - initialOffset; |
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|
437 outputStream.write(initialBytes, initialOffset, length); |
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diff
changeset
|
438 bytesWritten += length; |
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parents:
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changeset
|
439 initialOffset = assembledObject.endPosition(); |
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|
440 } |
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parents:
diff
changeset
|
441 } |
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parents:
diff
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|
442 |
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diff
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|
443 // Copy the original assembler output (if any) after the last mutable assembled object |
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parents:
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|
444 outputStream.write(initialBytes, initialOffset, initialBytes.length - initialOffset); |
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parents:
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changeset
|
445 bytesWritten += initialBytes.length - initialOffset; |
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Added Java files from Maxine project.
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parents:
diff
changeset
|
446 |
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|
447 if (padOutput) { |
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parents:
diff
changeset
|
448 final int padding = (initialBytes.length + potentialExpansionSize) - bytesWritten; |
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parents:
diff
changeset
|
449 assert padding >= 0; |
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff
changeset
|
450 if (padding > 0) { |
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parents:
diff
changeset
|
451 stream.reset(); |
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff
changeset
|
452 emitPadding(padding); |
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parents:
diff
changeset
|
453 stream.writeTo(outputStream); |
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff
changeset
|
454 bytesWritten += padding; |
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff
changeset
|
455 } |
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Added Java files from Maxine project.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff
changeset
|
456 } |
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parents:
diff
changeset
|
457 return bytesWritten; |
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parents:
diff
changeset
|
458 } finally { |
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff
changeset
|
459 selectingLabelInstructions = true; |
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Added Java files from Maxine project.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff
changeset
|
460 } |
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Added Java files from Maxine project.
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parents:
diff
changeset
|
461 } |
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff
changeset
|
462 |
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff
changeset
|
463 /** |
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parents:
diff
changeset
|
464 * Emits padding to the instruction stream in the form of NOP instructions. |
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff
changeset
|
465 * |
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parents:
diff
changeset
|
466 * @param numberOfBytes |
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff
changeset
|
467 * @throws AssemblyException if exactly {@code numberOfBytes} cannot be emitted as a sequence of one or more valid NOP instructions |
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parents:
diff
changeset
|
468 */ |
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parents:
diff
changeset
|
469 protected abstract void emitPadding(int numberOfBytes) throws AssemblyException; |
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parents:
diff
changeset
|
470 |
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff
changeset
|
471 /** |
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parents:
diff
changeset
|
472 * Writes the object code assembled so far to a given output stream. |
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff
changeset
|
473 * |
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parents:
diff
changeset
|
474 * @return the number of bytes written {@code outputStream} |
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parents:
diff
changeset
|
475 * @throws AssemblyException |
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parents:
diff
changeset
|
476 * if there any problem with binding labels to addresses |
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff
changeset
|
477 */ |
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parents:
diff
changeset
|
478 public int output(OutputStream outputStream, InlineDataRecorder inlineDataRecorder) throws IOException, AssemblyException { |
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Added Java files from Maxine project.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff
changeset
|
479 final int upperLimitForCurrentOutputSize = upperLimitForCurrentOutputSize(); |
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parents:
diff
changeset
|
480 final byte[] initialBytes = stream.toByteArray(); |
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parents:
diff
changeset
|
481 gatherLabels(); |
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff
changeset
|
482 updateSpanDependentVariableInstructions(); |
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Added Java files from Maxine project.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff
changeset
|
483 final int bytesWritten = writeOutput(outputStream, initialBytes, inlineDataRecorder); |
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Added Java files from Maxine project.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff
changeset
|
484 assert !padOutput || upperLimitForCurrentOutputSize == bytesWritten; |
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff
changeset
|
485 return bytesWritten; |
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Added Java files from Maxine project.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff
changeset
|
486 } |
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Added Java files from Maxine project.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff
changeset
|
487 |
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Added Java files from Maxine project.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff
changeset
|
488 /** |
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff
changeset
|
489 * Gets the maximum size of the code array that would be assembled by a call to {@link #output(OutputStream)} or |
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Added Java files from Maxine project.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff
changeset
|
490 * {@link #toByteArray()}. For a variable sized instruction set (e.g. x86), the exact size may be known until the |
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Added Java files from Maxine project.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff
changeset
|
491 * code is assembled as the size of certain instructions depends on their position in the instruction and/or the |
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Added Java files from Maxine project.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff
changeset
|
492 * {@linkplain #baseAddress() base address} at which the code is being assembled. |
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Added Java files from Maxine project.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff
changeset
|
493 * <p> |
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Added Java files from Maxine project.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff
changeset
|
494 * <b>Note that any subsequent call that adds a new instruction to the instruction stream invalidates the value |
e233f5660da4
Added Java files from Maxine project.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff
changeset
|
495 * returned by this method.</b> |
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Added Java files from Maxine project.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff
changeset
|
496 */ |
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Added Java files from Maxine project.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff
changeset
|
497 public int upperLimitForCurrentOutputSize() { |
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Added Java files from Maxine project.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff
changeset
|
498 return currentPosition() + potentialExpansionSize; |
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Added Java files from Maxine project.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff
changeset
|
499 } |
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Added Java files from Maxine project.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff
changeset
|
500 |
e233f5660da4
Added Java files from Maxine project.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff
changeset
|
501 private boolean padOutput; |
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff
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502 |
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Added Java files from Maxine project.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff
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503 /** |
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff
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|
504 * Sets or unsets the flag determining if the code assembled by a call to {@link #output(OutputStream)} or |
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Added Java files from Maxine project.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff
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505 * {@link #toByteArray()} should be padded with NOPs at the end to ensure that the code size equals the value |
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parents:
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506 * returned by {@link #upperLimitForCurrentOutputSize()}. This default value of the flag is {@code false}. |
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
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507 */ |
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parents:
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508 public void setPadOutput(boolean flag) { |
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parents:
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509 padOutput = flag; |
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff
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510 } |
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff
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511 |
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff
changeset
|
512 /** |
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
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513 * Returns the object code assembled so far in a byte array. |
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
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514 * |
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
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515 * @throws AssemblyException |
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
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516 * if there any problem with binding labels to addresses |
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
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517 */ |
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
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518 public byte[] toByteArray(InlineDataRecorder inlineDataRecorder) throws AssemblyException { |
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
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519 final ByteArrayOutputStream baos = new ByteArrayOutputStream(upperLimitForCurrentOutputSize()); |
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
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520 try { |
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
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521 output(baos, inlineDataRecorder); |
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
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522 baos.close(); |
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parents:
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523 final byte[] result = baos.toByteArray(); |
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
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524 return result; |
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
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525 } catch (IOException ioException) { |
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
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526 throw ProgramError.unexpected("IOException during output to byte array", ioException); |
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
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527 } |
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Added Java files from Maxine project.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff
changeset
|
528 } |
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
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changeset
|
529 |
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
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changeset
|
530 public byte[] toByteArray() throws AssemblyException { |
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
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531 return toByteArray(null); |
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
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|
532 } |
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
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|
533 |
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
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|
534 /** |
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff
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|
535 * @see Label#fix32(int) |
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
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|
536 */ |
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parents:
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537 protected void fixLabel32(Label label, int address32) { |
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
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538 label.fix32(address32); |
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff
changeset
|
539 } |
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff
changeset
|
540 |
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff
changeset
|
541 /** |
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
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changeset
|
542 * @see Label#fix64(long) |
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
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changeset
|
543 */ |
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
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changeset
|
544 protected void fixLabel64(Label label, long address64) { |
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
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|
545 label.fix64(address64); |
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff
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|
546 } |
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff
changeset
|
547 |
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff
changeset
|
548 protected int address32(Label label) throws AssemblyException { |
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
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|
549 return label.address32(); |
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff
changeset
|
550 } |
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff
changeset
|
551 |
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff
changeset
|
552 protected long address64(Label label) throws AssemblyException { |
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff
changeset
|
553 return label.address64(); |
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff
changeset
|
554 } |
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff
changeset
|
555 |
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff
changeset
|
556 protected void checkConstraint(boolean passed, String expression) { |
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff
changeset
|
557 if (!passed) { |
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff
changeset
|
558 throw new IllegalArgumentException(expression); |
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff
changeset
|
559 } |
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff
changeset
|
560 } |
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Added Java files from Maxine project.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff
changeset
|
561 |
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Added Java files from Maxine project.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff
changeset
|
562 /** |
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff
changeset
|
563 * Calculate the difference between two Labels. This works whether the labels |
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff
changeset
|
564 * are fixed or bound. |
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Added Java files from Maxine project.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff
changeset
|
565 * @throws AssemblyException |
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff
changeset
|
566 */ |
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff
changeset
|
567 public int labelOffsetRelative(Label label, Label relativeTo) throws AssemblyException { |
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff
changeset
|
568 return labelOffsetRelative(label, 0) - labelOffsetRelative(relativeTo, 0); |
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Added Java files from Maxine project.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff
changeset
|
569 } |
e233f5660da4
Added Java files from Maxine project.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff
changeset
|
570 |
e233f5660da4
Added Java files from Maxine project.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff
changeset
|
571 /** |
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Added Java files from Maxine project.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff
changeset
|
572 * Calculate the difference between a Label and a position within the assembled code. |
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff
changeset
|
573 * @throws AssemblyException |
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Added Java files from Maxine project.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff
changeset
|
574 */ |
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Added Java files from Maxine project.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff
changeset
|
575 public int labelOffsetRelative(Label label, int position) throws AssemblyException { |
e233f5660da4
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff
changeset
|
576 switch (label.state()) { |
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Added Java files from Maxine project.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff
changeset
|
577 case BOUND: { |
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Added Java files from Maxine project.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff
changeset
|
578 return label.position() - position; |
e233f5660da4
Added Java files from Maxine project.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff
changeset
|
579 } |
e233f5660da4
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff
changeset
|
580 case FIXED_32: { |
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff
changeset
|
581 final Assembler32 assembler32 = (Assembler32) this; |
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Added Java files from Maxine project.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff
changeset
|
582 return assembler32.address(label) - (assembler32.startAddress() + position); |
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Added Java files from Maxine project.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff
changeset
|
583 } |
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Added Java files from Maxine project.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff
changeset
|
584 case FIXED_64: { |
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Added Java files from Maxine project.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff
changeset
|
585 final Assembler64 assembler64 = (Assembler64) this; |
e233f5660da4
Added Java files from Maxine project.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff
changeset
|
586 final long offset64 = assembler64.address(label) - (assembler64.startAddress() + position); |
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff
changeset
|
587 if (Longs.numberOfEffectiveSignedBits(offset64) > 32) { |
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Added Java files from Maxine project.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff
changeset
|
588 throw new AssemblyException("fixed 64-bit label out of 32-bit range"); |
e233f5660da4
Added Java files from Maxine project.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff
changeset
|
589 } |
e233f5660da4
Added Java files from Maxine project.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff
changeset
|
590 return (int) offset64; |
e233f5660da4
Added Java files from Maxine project.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff
changeset
|
591 } |
e233f5660da4
Added Java files from Maxine project.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff
changeset
|
592 default: { |
e233f5660da4
Added Java files from Maxine project.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff
changeset
|
593 throw new AssemblyException("unassigned label"); |
e233f5660da4
Added Java files from Maxine project.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff
changeset
|
594 } |
e233f5660da4
Added Java files from Maxine project.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff
changeset
|
595 } |
e233f5660da4
Added Java files from Maxine project.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff
changeset
|
596 } |
e233f5660da4
Added Java files from Maxine project.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff
changeset
|
597 |
e233f5660da4
Added Java files from Maxine project.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff
changeset
|
598 /** |
e233f5660da4
Added Java files from Maxine project.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff
changeset
|
599 * Calculate the difference between a Label and an assembled object. |
e233f5660da4
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff
changeset
|
600 * Different CPUs have different conventions for which end of an |
e233f5660da4
Added Java files from Maxine project.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff
changeset
|
601 * instruction to measure from. |
e233f5660da4
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff
changeset
|
602 * @throws AssemblyException |
e233f5660da4
Added Java files from Maxine project.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff
changeset
|
603 */ |
e233f5660da4
Added Java files from Maxine project.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff
changeset
|
604 public final int offsetInstructionRelative(Label label, AssemblyObject assembledObject) throws AssemblyException { |
e233f5660da4
Added Java files from Maxine project.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff
changeset
|
605 final int position = (isa().relativeBranchFromStart) ? assembledObject.startPosition() : assembledObject.endPosition(); |
e233f5660da4
Added Java files from Maxine project.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff
changeset
|
606 return labelOffsetRelative(label, position); |
e233f5660da4
Added Java files from Maxine project.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff
changeset
|
607 } |
e233f5660da4
Added Java files from Maxine project.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff
changeset
|
608 } |