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annotate graal/com.oracle.max.asmdis/src/com/sun/max/asm/InstructionWithOffset.java @ 3735:61369a06f03c

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Updated authors file.
author Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
date Sat, 17 Dec 2011 20:36:28 +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.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
e233f5660da4 Added Java files from Maxine project.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
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