Mercurial > hg > truffle
annotate graal/com.oracle.max.asmdis/src/com/sun/max/asm/InstructionWithOffset.java @ 4178:d1b26c17910a
Add the Dacapo benchmarks to the "lib" folder instead of using the environment variable. Fixed an issue in the downloader.
author | Thomas Wuerthinger <thomas.wuerthinger@oracle.com> |
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date | Mon, 02 Jan 2012 21:52:23 +0100 |
parents | e233f5660da4 |
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rev | line source |
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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.lang.*; |
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26 |
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27 /** |
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28 * An instruction that addresses some data as an offset from itself. |
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29 */ |
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30 public abstract class InstructionWithOffset extends InstructionWithLabel { |
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31 |
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32 /** |
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33 * The mask of all the valid offset sizes supported by the union of all instructions that can address some data via an offset. |
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34 */ |
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35 public static final int ALL_VALID_OFFSET_SIZES_MASK = WordWidth.BITS_8.numberOfBytes | WordWidth.BITS_16.numberOfBytes | WordWidth.BITS_32.numberOfBytes | WordWidth.BITS_64.numberOfBytes; |
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36 |
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37 private final int validOffsetSizesMask; |
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38 private int offsetSize; |
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39 |
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40 /** |
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41 * Creates an object representing an instruction that addresses some data as an offset from itself. |
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42 * |
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43 * @param startPosition the current position in the instruction stream of the instruction's first byte |
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44 * @param endPosition the current position in the instruction stream one byte past the instruction's last byte |
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45 * @param label a label representing the position referred to by this instruction |
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46 * @param validOffsetSizesMask a mask of the offset sizes supported by a concrete instruction. This value must not |
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47 * be 0 and its set of non-zero bits must be a subset of the non-zero bits of |
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48 * {@link #ALL_VALID_OFFSET_SIZES_MASK}. The one-bit integer values (i.e. the powers of two) |
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49 * corresponding with each set bit in the mask are the offset sizes for which there is an available |
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50 * concrete instruction. The concrete instruction emitted once the label has been bound is the one with |
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51 * smallest offset size that can represent the distance between the label's position and this |
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52 * instruction. |
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53 */ |
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54 protected InstructionWithOffset(Assembler assembler, int startPosition, int endPosition, Label label, int validOffsetSizesMask) { |
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55 super(assembler, startPosition, endPosition, label); |
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56 this.validOffsetSizesMask = validOffsetSizesMask; |
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57 assert validOffsetSizesMask != 0; |
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58 assert (validOffsetSizesMask & ~ALL_VALID_OFFSET_SIZES_MASK) == 0; |
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59 if (Ints.isPowerOfTwoOrZero(validOffsetSizesMask)) { |
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60 assembler.addFixedSizeAssembledObject(this); |
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61 this.offsetSize = validOffsetSizesMask; |
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62 } else { |
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63 assembler.addSpanDependentInstruction(this); |
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64 this.offsetSize = Integer.lowestOneBit(validOffsetSizesMask); |
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65 } |
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66 } |
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67 |
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68 protected InstructionWithOffset(Assembler assembler, int startPosition, int endPosition, Label label) { |
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69 super(assembler, startPosition, endPosition, label); |
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70 this.validOffsetSizesMask = 0; |
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71 assembler.addFixedSizeAssembledObject(this); |
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72 } |
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73 |
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74 void setSize(int nBytes) { |
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75 variableSize = nBytes; |
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76 } |
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77 |
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78 protected final int labelSize() { |
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79 return offsetSize; |
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80 } |
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81 |
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82 /** |
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83 * Updates the size of this instruction's label based on the value bound to the label. |
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84 * |
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85 * @return true if the size of this instruction's label was changed |
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86 */ |
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87 boolean updateLabelSize() throws AssemblyException { |
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88 if (validOffsetSizesMask == 0) { |
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89 return false; |
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90 } |
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91 int newOffsetSize = WordWidth.signedEffective(offset()).numberOfBytes; |
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92 if (newOffsetSize > this.offsetSize) { |
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93 final int maxLabelSize = Integer.highestOneBit(validOffsetSizesMask); |
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94 if (newOffsetSize > maxLabelSize) { |
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95 throw new AssemblyException("instruction cannot accomodate number of bits required for offset"); |
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96 } |
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97 while ((newOffsetSize & validOffsetSizesMask) == 0) { |
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98 newOffsetSize = newOffsetSize << 1; |
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99 } |
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100 this.offsetSize = newOffsetSize; |
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101 return true; |
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102 } |
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103 return false; |
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104 } |
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105 |
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106 private int offset() throws AssemblyException { |
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107 return assembler().offsetInstructionRelative(label(), this); |
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108 } |
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109 |
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110 protected byte offsetAsByte() throws AssemblyException { |
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111 if (assembler().selectingLabelInstructions()) { |
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112 return (byte) 0; |
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113 } |
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114 final int result = offset(); |
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115 if (Ints.numberOfEffectiveSignedBits(result) > 8) { |
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116 throw new AssemblyException("label out of 8-bit range"); |
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117 } |
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118 return (byte) result; |
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119 } |
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120 |
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121 protected short offsetAsShort() throws AssemblyException { |
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122 if (assembler().selectingLabelInstructions()) { |
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123 return (short) 0; |
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124 } |
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125 final int result = offset(); |
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126 if (Ints.numberOfEffectiveSignedBits(result) > 16) { |
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127 throw new AssemblyException("label out of 16-bit range"); |
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128 } |
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129 return (short) result; |
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130 } |
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131 |
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132 protected int offsetAsInt() throws AssemblyException { |
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133 if (assembler().selectingLabelInstructions()) { |
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134 return 0; |
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135 } |
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136 return offset(); |
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137 } |
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138 |
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139 } |