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annotate graal/com.oracle.max.asmdis/src/com/sun/max/asm/dis/risc/RiscDisassembler.java @ 3733:e233f5660da4

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Added Java files from Maxine project.
author Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
date Sat, 17 Dec 2011 19:59:18 +0100
parents
children bc8527f3071c
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3733
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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.dis.risc;
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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 import java.util.Arrays;
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28
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29 import com.sun.max.*;
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30 import com.sun.max.asm.*;
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31 import com.sun.max.asm.dis.*;
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32 import com.sun.max.asm.gen.*;
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33 import com.sun.max.asm.gen.risc.*;
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34 import com.sun.max.asm.gen.risc.bitRange.*;
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35 import com.sun.max.asm.gen.risc.field.*;
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36 import com.sun.max.lang.*;
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37 import com.sun.max.program.*;
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38
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39 /**
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40 */
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41 public abstract class RiscDisassembler extends Disassembler {
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42
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43 private final RiscAssembly assembly;
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44
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45 protected RiscDisassembler(ImmediateArgument startAddress, RiscAssembly assembly, Endianness endianness, InlineDataDecoder inlineDataDecoder) {
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46 super(startAddress, endianness, inlineDataDecoder);
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47 assert assembly != null;
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48 this.assembly = assembly;
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49 this.byteFields = new ImmediateOperandField[]{createByteField(0), createByteField(1), createByteField(2), createByteField(3)};
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50 }
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51
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52 public RiscAssembly assembly() {
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53 return assembly;
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54 }
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55
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56 private static final boolean INLINE_INVALID_INSTRUCTIONS_AS_BYTES = true;
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57
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58 /**
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59 * Extract the value for each operand of a template from an encoded instruction whose opcode
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60 * matches that of the template.
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61 *
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62 * @param instruction the encoded instruction
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63 * @return the decoded arguments for each operand or null if at least one operand has
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64 * an invalid value in the encoded instruction
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65 */
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66 private List<Argument> disassemble(int instruction, RiscTemplate template) {
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67 final List<Argument> arguments = new ArrayList<Argument>();
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68 for (OperandField operandField : template.parameters()) {
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69 final Argument argument = operandField.disassemble(instruction);
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70 if (argument == null) {
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71 return null;
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72 }
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73 arguments.add(argument);
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74 }
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75 return arguments;
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76 }
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77
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78 private boolean isLegalArgumentList(RiscTemplate template, List<Argument> arguments) {
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79 final List<InstructionConstraint> constraints = template.instructionDescription().constraints();
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80 for (InstructionConstraint constraint : constraints) {
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81 if (!(constraint.check(template, arguments))) {
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82 return false;
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83 }
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84 }
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85 return true;
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86 }
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87
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88 /**
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89 * Creates a disassembled instruction based on a given sequence of bytes, a template and a set of arguments. The
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90 * caller has performed the necessary decoding of the bytes to derive the template and arguments.
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91 *
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92 * @param position the position an instruction stream from which the bytes were read
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93 * @param bytes the bytes of an instruction
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94 * @param template the template that corresponds to the instruction encoded in {@code bytes}
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95 * @param arguments the arguments of the instruction encoded in {@code bytes}
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96 * @return a disassembled instruction representing the result of decoding {@code bytes} into an instruction
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97 */
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98 protected abstract DisassembledInstruction createDisassembledInstruction(int position, byte[] bytes, RiscTemplate template, List<Argument> arguments);
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99
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100 @Override
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101 public List<DisassembledObject> scanOne0(BufferedInputStream stream) throws IOException, AssemblyException {
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102 final int instruction = endianness().readInt(stream);
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103 final List<DisassembledObject> result = new LinkedList<DisassembledObject>();
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104 final byte[] instructionBytes = endianness().toBytes(instruction);
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105 for (SpecificityGroup specificityGroup : assembly().specificityGroups()) {
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106 for (OpcodeMaskGroup opcodeMaskGroup : specificityGroup.opcodeMaskGroups()) {
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107 final int opcode = instruction & opcodeMaskGroup.mask();
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108 for (RiscTemplate template : opcodeMaskGroup.templatesFor(opcode)) {
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109 // Skip synthetic instructions when preference is for raw instructions,
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110 // and skip instructions with a different number of arguments than requested if so (i.e. when running the AssemblyTester):
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111 if (template != null && template.isDisassemblable() && ((abstractionPreference() == AbstractionPreference.SYNTHETIC) || !template.instructionDescription().isSynthetic())) {
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112 final List<Argument> arguments = disassemble(instruction, template);
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113 if (arguments != null && (expectedNumberOfArguments() < 0 || arguments.size() == expectedNumberOfArguments())) {
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114 if (isLegalArgumentList(template, arguments)) {
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115 final Assembler assembler = createAssembler(currentPosition);
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116 try {
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117 assembly().assemble(assembler, template, arguments);
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118 final byte[] bytes = assembler.toByteArray();
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119 if (Arrays.equals(bytes, instructionBytes)) {
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120 final DisassembledInstruction disassembledInstruction = createDisassembledInstruction(currentPosition, bytes, template, arguments);
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121 result.add(disassembledInstruction);
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122 }
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123 } catch (AssemblyException assemblyException) {
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124 ProgramWarning.message("could not assemble matching instruction: " + template);
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125 }
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126 }
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127 }
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128 }
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129 }
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130 }
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131 }
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132 if (result.isEmpty()) {
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133 if (INLINE_INVALID_INSTRUCTIONS_AS_BYTES) {
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134 stream.reset();
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135 final InlineData inlineData = new InlineData(currentPosition, instructionBytes);
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136 final DisassembledData disassembledData = createDisassembledDataObjects(inlineData).iterator().next();
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137 result.add(disassembledData);
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138 } else {
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139 throw new AssemblyException("instruction could not be disassembled: " + Bytes.toHexLiteral(endianness().toBytes(instruction)));
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140 }
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141 }
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142 currentPosition += 4;
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143 return result;
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144 }
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145
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146 @Override
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147 public List<DisassembledObject> scan0(BufferedInputStream stream) throws IOException, AssemblyException {
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148 final List<DisassembledObject> result = new ArrayList<DisassembledObject>();
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149 try {
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150 while (true) {
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151
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152 scanInlineData(stream, result);
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153
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154 final List<DisassembledObject> disassembledObjects = scanOne(stream);
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155 boolean foundSyntheticDisassembledInstruction = false;
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156 if (abstractionPreference() == AbstractionPreference.SYNTHETIC) {
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157 for (DisassembledObject disassembledObject : disassembledObjects) {
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158 if (disassembledObject instanceof DisassembledInstruction) {
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159 final DisassembledInstruction disassembledInstruction = (DisassembledInstruction) disassembledObject;
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160 if (disassembledInstruction.template().instructionDescription().isSynthetic()) {
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161 result.add(disassembledInstruction);
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162 foundSyntheticDisassembledInstruction = true;
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163 break;
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164 }
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165 }
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166 }
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167 }
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168 if (!foundSyntheticDisassembledInstruction) {
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169 result.add(Utils.first(disassembledObjects));
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170 }
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171 }
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172 } catch (IOException ioException) {
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173 return result;
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174 }
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175 }
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176
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177 protected RiscTemplate createInlineDataTemplate(InstructionDescription instructionDescription) {
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178 return new RiscTemplate(instructionDescription);
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179 }
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180
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181 private final ImmediateOperandField[] byteFields;
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182
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183 private ImmediateOperandField createByteField(int index) {
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184 if (assembly().bitRangeEndianness() == BitRangeOrder.ASCENDING) {
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185 final int firstBit = index * Bytes.WIDTH;
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186 final int lastBit = firstBit + 7;
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187 return ImmediateOperandField.createAscending(firstBit, lastBit);
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188 }
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189 final int lastBit = index * Bytes.WIDTH;
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190 final int firstBit = lastBit + 7;
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191 return ImmediateOperandField.createDescending(firstBit, lastBit);
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192 }
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193
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194 @Override
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195 public ImmediateArgument addressForRelativeAddressing(DisassembledInstruction di) {
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196 return di.startAddress();
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197 }
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198
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199 @Override
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200 public String mnemonic(DisassembledInstruction di) {
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201 final RiscExternalInstruction instruction = new RiscExternalInstruction((RiscTemplate) di.template(), di.arguments(), di.startAddress(), null);
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202 return instruction.name();
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203 }
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204
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205 @Override
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diff changeset
206 public String operandsToString(DisassembledInstruction di, AddressMapper addressMapper) {
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diff changeset
207 final RiscExternalInstruction instruction = new RiscExternalInstruction((RiscTemplate) di.template(), di.arguments(), di.startAddress(), addressMapper);
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208 return instruction.operands();
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209 }
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diff changeset
210
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diff changeset
211 @Override
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diff changeset
212 public String toString(DisassembledInstruction di, AddressMapper addressMapper) {
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213 final RiscExternalInstruction instruction = new RiscExternalInstruction((RiscTemplate) di.template(), di.arguments(), di.startAddress(), addressMapper);
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diff changeset
214 return instruction.toString();
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215 }
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216 }