author | Matti Laitinen <matti.t.laitinen@nokia.com> |
Thu, 11 Feb 2010 15:50:58 +0200 | |
changeset 0 | 818e61de6cd1 |
permissions | -rw-r--r-- |
0
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/* |
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* Copyright (c) 2009 Nokia Corporation and/or its subsidiary(-ies). |
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* All rights reserved. |
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* This component and the accompanying materials are made available |
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* under the terms of "Eclipse Public License v1.0" |
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* which accompanies this distribution, and is available |
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* at the URL "http://www.eclipse.org/legal/epl-v10.html". |
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* |
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* Initial Contributors: |
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* Nokia Corporation - initial contribution. |
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* |
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* Contributors: |
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* |
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* Description: |
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* |
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*/ |
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using System; |
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using System.IO; |
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using System.Text; |
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using System.Security.Cryptography; |
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using System.Collections.Generic; |
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using CrashItemLib.Crash; |
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using CrashItemLib.Crash.Base; |
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using CrashItemLib.Crash.Processes; |
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using CrashItemLib.Crash.Registers; |
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using CrashItemLib.Crash.Registers.Special; |
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using CrashItemLib.Crash.Stacks; |
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using CrashItemLib.Crash.Threads; |
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using CrashItemLib.Crash.Symbols; |
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using CrashItemLib.Crash.Summarisable; |
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using SymbianStructuresLib.Arm.Registers; |
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|
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|
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namespace CrashInfoFilePlugin.PluginImplementations.FileFormat |
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{ |
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public class CCrashInfoHashBuilder |
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{ |
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#region Enumerations |
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[Flags] |
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public enum TConfiguration |
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{ |
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// <summary> |
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// Include stack data in hash |
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// </summary> |
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EIncludeStack = 1, |
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|
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// <summary> |
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// Force inclusion of stack data in hash, even if hash builder |
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// believes that it's inclusion is not needed in order to uniquely |
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// pin-point the crash. |
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// </summary> |
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EIncludeStackForced = 2, |
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|
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// <summary> |
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// By default, offset is only included in program counter symbol. |
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// This will force it to be incldued for all symbols (i.e. even |
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// those within stack trace). |
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// </summary> |
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EIncludeOffsetsForAllSymbols = 4, |
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|
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// <summary> |
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// Include the processor mode at the time of the crash within the hash. |
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// </summary> |
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EIncludeProcessorMode = 8, |
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|
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// <summary> |
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// By default we output an MD5 hash, but you can enable plain text |
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// output by using this option. |
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// </summary> |
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EOutputAsText = 16, |
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|
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// <summary> |
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// A general purpose default configuration |
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// </summary> |
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EDefault = EIncludeStack | EIncludeStackForced | EIncludeProcessorMode |
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} |
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#endregion |
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|
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#region Factory |
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public static CCrashInfoHashBuilder New( TConfiguration aConfig, CISummarisableEntity aEntity ) |
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{ |
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CCrashInfoHashBuilder ret = CCrashInfoHashBuilder.New( aConfig, aEntity, KDefaultNumberOfStackEntriesToCheckForSymbols ); |
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return ret; |
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} |
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|
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public static CCrashInfoHashBuilder New( TConfiguration aConfig, CISummarisableEntity aEntity, int aNumberOfStackEntriesToCheck ) |
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{ |
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// By default we'll return an empty string for the hash if mandatory input |
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// elements are not available |
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CCrashInfoHashBuilder ret = null; |
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// |
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CIStack stack = aEntity.Stack; |
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CIThread thread = aEntity.Thread; |
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CIProcess process = aEntity.Process; |
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CIRegisterList regs = aEntity.Registers; |
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// |
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if ( stack != null && regs != null ) |
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{ |
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if ( process == null || thread == null ) |
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100 |
{ |
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ret = new CCrashInfoHashBuilder( aConfig, regs, stack, aNumberOfStackEntriesToCheck ); |
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} |
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else |
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{ |
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ret = new CCrashInfoHashBuilder( aConfig, regs, stack, thread, process, aNumberOfStackEntriesToCheck ); |
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} |
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} |
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108 |
else |
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109 |
{ |
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110 |
throw new ArgumentException( LibResources.KRes_CCrashInfoHashBuilder_BadSummarisable ); |
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111 |
} |
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112 |
// |
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113 |
return ret; |
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114 |
} |
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115 |
#endregion |
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116 |
|
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117 |
#region Constructors |
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private CCrashInfoHashBuilder( TConfiguration aConfig, CIRegisterList aRegisters, CIStack aStack, int aNumberOfStackEntriesToCheck ) |
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: this( aConfig, aRegisters, aStack, null, null, aNumberOfStackEntriesToCheck ) |
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120 |
{ |
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121 |
} |
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122 |
|
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123 |
private CCrashInfoHashBuilder( TConfiguration aConfig, CIRegisterList aRegisters, CIStack aStack, CIThread aThread, CIProcess aProcess, int aNumberOfStackEntriesToCheck ) |
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124 |
{ |
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125 |
iConfig = aConfig; |
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iRegisters = aRegisters; |
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iStack = aStack; |
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iProcess = aProcess; |
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iThread = aThread; |
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iNumberOfStackEntriesToCheck = aNumberOfStackEntriesToCheck; |
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131 |
} |
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132 |
#endregion |
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133 |
|
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134 |
#region API |
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135 |
public string GetHash() |
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136 |
{ |
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137 |
StringBuilder hash = new StringBuilder(); |
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138 |
// |
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139 |
if ( ( iConfig & TConfiguration.EIncludeProcessorMode ) != 0 ) |
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140 |
{ |
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141 |
string processorMode = GetProcessorMode(); |
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142 |
hash.AppendFormat( "MODE: [{0}] ", processorMode ); |
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143 |
} |
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144 |
// |
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145 |
string moduleName = GetAppropriateBinaryModuleName(); |
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146 |
hash.AppendFormat( "MODN: [{0}] ", moduleName ); |
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147 |
// |
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148 |
string programCounter = GetProgramCounter(); |
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149 |
hash.AppendFormat( "PC: [{0}] ", programCounter ); |
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150 |
// |
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151 |
if ( ( iConfig & TConfiguration.EIncludeStack ) != 0 || ( iConfig & TConfiguration.EIncludeStackForced ) != 0 ) |
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152 |
{ |
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153 |
string stackSymbols = GetStackSymbols(); |
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154 |
hash.AppendFormat( "STK: [{0}] ", stackSymbols ); |
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155 |
} |
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156 |
|
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157 |
// Final stage is to MD5 hash the text, unless the caller requested |
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158 |
// plain text output. |
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159 |
string ret = hash.ToString(); |
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160 |
if ( ( iConfig & TConfiguration.EOutputAsText ) == 0 ) |
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161 |
{ |
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162 |
ret = GetMD5( ret ); |
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163 |
} |
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164 |
// |
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165 |
return ret; |
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166 |
} |
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167 |
#endregion |
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168 |
|
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169 |
#region Internal constants |
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170 |
private const int KDefaultNumberOfStackEntriesToCheckForSymbols = 4; |
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171 |
#endregion |
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172 |
|
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173 |
#region Internal methods |
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174 |
private string GetProcessorMode() |
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175 |
{ |
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176 |
string ret = LibResources.KRes_CCrashInfoHashBuilder_NoCPUMode; |
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177 |
// |
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178 |
if ( iRegisters.IsCurrentProcessorMode ) |
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179 |
{ |
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180 |
CIRegisterCPSR cpsr = iRegisters[ TArmRegisterType.EArmReg_CPSR ] as CIRegisterCPSR; |
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181 |
if ( cpsr != null ) |
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182 |
{ |
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183 |
ret = ArmRegisterBankUtils.BankAsString( cpsr.ProcessorMode ); |
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184 |
} |
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185 |
} |
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186 |
// |
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187 |
return ret; |
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188 |
} |
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|
189 |
|
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190 |
private string GetAppropriateBinaryModuleName() |
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191 |
{ |
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192 |
// We'll use the name of the binary associated with the program |
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193 |
// counter symbol (if present) or then if not, we'll fall back |
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194 |
// to using the process name. |
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195 |
string ret = string.Empty; |
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196 |
// |
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197 |
bool fallBack = false; |
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198 |
if ( iRegisters.Contains( TArmRegisterType.EArmReg_PC ) ) |
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199 |
{ |
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200 |
CIRegister pc = iRegisters[ TArmRegisterType.EArmReg_PC ]; |
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201 |
if ( pc.Symbol.IsNull == false ) |
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202 |
{ |
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203 |
// Symbol available - use the associated binary name |
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204 |
string binName = pc.Symbol.Symbol.Collection.FileName.EitherFullNameButDevicePreferred; |
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205 |
ret = Path.GetFileName( binName ); |
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206 |
} |
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207 |
else |
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|
208 |
{ |
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209 |
fallBack = true; |
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210 |
} |
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211 |
} |
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212 |
else |
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|
213 |
{ |
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214 |
fallBack = true; |
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215 |
} |
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|
216 |
|
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217 |
// Do we need to fallback because symbol et al was unavailable? |
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if ( fallBack ) |
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219 |
{ |
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// No Symbol, then in this case we'll try to fall back |
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// to the process name. |
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if ( iProcess != null ) |
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223 |
{ |
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ret = iProcess.Name; |
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} |
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226 |
else |
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227 |
{ |
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228 |
// Must be e.g. IRQ, FIQ, ABT, etc |
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ret = LibResources.KRes_CCrashInfoHashBuilder_AbortModeStack; |
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230 |
} |
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231 |
} |
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232 |
// |
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233 |
return ret; |
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234 |
} |
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235 |
|
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236 |
private string GetProgramCounter() |
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237 |
{ |
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string ret = string.Empty; |
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239 |
// |
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if ( iRegisters.Contains( TArmRegisterType.EArmReg_PC ) ) |
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241 |
{ |
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CIRegister pc = iRegisters[ TArmRegisterType.EArmReg_PC ]; |
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ret = CleanSymbol( pc.Value, pc.Symbol, true ); |
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} |
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245 |
// |
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246 |
return ret; |
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247 |
} |
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248 |
|
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249 |
private string GetStackSymbols() |
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{ |
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251 |
StringBuilder ret = new StringBuilder(); |
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252 |
// |
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253 |
if ( iStack.IsStackOutputAvailable ) |
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254 |
{ |
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255 |
bool isOverflow = iStack.IsOverflow; |
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256 |
bool isForced = ( iConfig & TConfiguration.EIncludeStackForced ) != 0; |
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257 |
bool isNullDereference = ( iStack.Registers.Contains( TArmRegisterType.EArmReg_00 ) && iStack.Registers[ TArmRegisterType.EArmReg_00 ].Value == 0 ); |
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258 |
|
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259 |
// If dealing with a stack overflow, then we don't, by default, include any |
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260 |
// symbols from the stack, as they are likely to be entirely dirty or "ghosts" for |
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261 |
// the most part. |
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262 |
// |
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263 |
// Furthermore, if the 'crash' was caused by dereferencing a NULL this pointer |
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264 |
// (which is somewhat of a guess on our part, but we ascertain this by inspecting |
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265 |
// the value of R0) then we don't include stack either. |
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266 |
// |
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267 |
// However, the above behaviour can be overriden by forcing stack processing. |
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268 |
bool processEntries = ( ( isOverflow == false && isNullDereference == false ) || isForced ); |
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269 |
if ( processEntries ) |
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270 |
{ |
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271 |
// Get the entries and work out the number of items we should check for |
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272 |
// associated symbols. |
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273 |
CIElementList<CIStackEntry> stackEntries = iStack.ChildrenByType<CIStackEntry>(); |
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274 |
|
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275 |
// Discard all the entries that are outside of the stack pointer range. |
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276 |
// Once we see a register-based entry (for accurate decoding) or the current |
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277 |
// stack pointer entry, we've reached the start of the interesting stack data. |
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278 |
// |
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279 |
// However, if there has been a stack overflow then don't discard anything |
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280 |
// or else we'll end up with nothing left! |
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281 |
if ( iStack.IsOverflow == false && stackEntries.Count > 0 ) |
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282 |
{ |
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283 |
int i = 0; |
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284 |
while ( stackEntries.Count > 0 ) |
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285 |
{ |
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286 |
// If we see a register based entry then the stack reconstruction almost certainly |
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287 |
// used the accurate algorithm. |
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288 |
// |
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289 |
// Since we have already included the program counter in the hash text, it doesn't |
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290 |
// make sense to include it twice, so skip that. |
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291 |
// However, link register might be useful. |
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|
292 |
bool remove = true; |
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|
293 |
CIStackEntry entry = stackEntries[ i ]; |
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294 |
|
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295 |
if ( entry.IsCurrentStackPointerEntry ) |
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296 |
{ |
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|
297 |
break; |
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298 |
} |
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|
299 |
else if ( entry.IsRegisterBasedEntry ) |
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300 |
{ |
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|
301 |
// Preserve LR, skip PC |
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302 |
if ( entry.Register.Type == TArmRegisterType.EArmReg_LR ) |
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|
303 |
{ |
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|
304 |
++i; |
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|
305 |
remove = false; |
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|
306 |
} |
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|
307 |
} |
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|
308 |
|
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309 |
if ( remove ) |
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|
310 |
{ |
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|
311 |
stackEntries.RemoveAt( 0 ); |
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|
312 |
} |
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|
313 |
} |
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|
314 |
} |
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|
315 |
|
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|
316 |
// Did the caller also want offsets within the output? By default only the program |
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|
317 |
// counter receives this treatment, but it can be overridden. |
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|
318 |
bool includeOffset = ( iConfig & TConfiguration.EIncludeOffsetsForAllSymbols ) != 0; |
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|
319 |
|
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|
320 |
// We should now have the stack entries directly relating to the crash call stack. |
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|
321 |
// Process them in turn, but only look at entries which happen to have associated |
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|
322 |
// symbols. |
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|
323 |
|
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|
324 |
int SymbolsNeeded = iNumberOfStackEntriesToCheck; |
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|
325 |
foreach (CIStackEntry entry in stackEntries) |
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326 |
{ |
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327 |
if ( entry.Symbol != null && entry.Symbol.IsNull == false ) |
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328 |
{ |
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329 |
string txt = CleanSymbol( entry.Data, entry.Symbol, includeOffset ); |
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330 |
ret.AppendFormat( "{0}, ", txt ); |
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331 |
SymbolsNeeded--; |
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332 |
} |
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333 |
if (SymbolsNeeded == 0) |
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334 |
{ |
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335 |
break; |
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336 |
} |
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337 |
} |
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338 |
|
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339 |
// Remove trailing comma |
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340 |
string t = ret.ToString(); |
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341 |
if ( t.EndsWith( ", " ) ) |
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342 |
{ |
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343 |
ret = ret.Remove( ret.Length - 2, 2 ); |
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344 |
} |
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345 |
} |
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346 |
} |
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347 |
// |
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348 |
string final = ret.ToString().TrimEnd(); |
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349 |
return final; |
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350 |
} |
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351 |
|
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352 |
private string GetMD5( string aMakeHash ) |
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353 |
{ |
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354 |
MD5 md5 = MD5.Create(); |
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355 |
byte[] inputBytes = Encoding.ASCII.GetBytes( aMakeHash ); |
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356 |
byte[] hash = md5.ComputeHash( inputBytes ); |
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357 |
// |
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358 |
StringBuilder sb = new StringBuilder(); |
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359 |
// |
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360 |
for ( int i = 0; i < hash.Length; i++ ) |
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361 |
{ |
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362 |
sb.Append( hash[ i ].ToString( "x2" ) ); |
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363 |
} |
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364 |
// |
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365 |
return sb.ToString(); |
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366 |
} |
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|
367 |
|
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368 |
private static string CleanSymbol( uint aAddress, CISymbol aSymbol, bool aAddOffset ) |
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369 |
{ |
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370 |
string ret = string.Empty; |
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371 |
// |
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372 |
if ( aSymbol.IsNull == false ) |
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|
373 |
{ |
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374 |
if ( aAddOffset ) |
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375 |
{ |
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376 |
// Only include the name and offset, not the address |
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377 |
uint offset = aSymbol.Symbol.Offset( aAddress ); |
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378 |
ret = string.Format( "|0x{0:x4}| {1}", offset, aSymbol.Symbol.Name ); |
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|
379 |
} |
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|
380 |
else |
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|
381 |
{ |
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|
382 |
ret = aSymbol.Symbol.Name; |
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|
383 |
} |
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|
384 |
} |
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|
385 |
// |
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|
386 |
return ret; |
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|
387 |
} |
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|
388 |
#endregion |
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|
389 |
|
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|
390 |
#region Data members |
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|
391 |
private readonly TConfiguration iConfig; |
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|
392 |
private readonly CIRegisterList iRegisters; |
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|
393 |
private readonly CIStack iStack; |
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|
394 |
private readonly CIThread iThread; |
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|
395 |
private readonly CIProcess iProcess; |
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|
396 |
private readonly int iNumberOfStackEntriesToCheck; |
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|
397 |
#endregion |
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|
398 |
} |
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|
399 |
} |