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<h2>Examples</h2>
Some typical example uses:
<ol>
<li><a href="#with">Restoring a stack trace with line numbers</a></li>
<li><a href="#withverbose">Restoring a stack trace with line numbers
(verbose)</a></li>
<li><a href="#without">Restoring a stack trace without line numbers</a></li>
</ol>
<h3><a name="with">Restoring a stack trace with line numbers</a></h3>
Assume for instance ProGuard itself has been obfuscated using the following
extra options:
<pre>
-printmapping proguard.map
-renamesourcefileattribute ProGuard
-keepattributes SourceFile,LineNumberTable
</pre>
<p>
Now assume the processed application throws an exception, and we have saved the
stack trace in <code>proguard.trace</code>, shown below. Of course, in real
life ProGuard rarely throws exceptions, so this is a purposely generated
exception. :)
<pre>
Exception in thread "main" java.lang.Error: Random exception
at pro.bY.a(ProGuard:576)
at pro.bO.a(ProGuard:431)
at pro.bj.a(ProGuard:145)
at pro.bY.a(ProGuard:522)
at pro.bj.a(ProGuard:129)
at pro.bN.a(ProGuard:125)
at pro.bY.a(ProGuard:251)
at pro.bY.a(ProGuard:229)
at pro.l.a(ProGuard:55)
at pro.bo.b(ProGuard:405)
at pro.ci.a(ProGuard:51)
at pro.bo.a(ProGuard:356)
at pro.be.a(ProGuard:109)
at pro.bo.a(ProGuard:356)
at pro.be.a(ProGuard:186)
at pro.bg.a(ProGuard:369)
at pro.bY.a(ProGuard:286)
at pro.bh.a(ProGuard:55)
at pro.bg.b(ProGuard:408)
at pro.bY.a(ProGuard:190)
at pro.bg.a(ProGuard:369)
at pro.M.a(ProGuard:110)
at pro.bY.a(ProGuard:449)
at pro.M.a(ProGuard:99)
at pro.bo.a(ProGuard:372)
at pro.bY.a(ProGuard:649)
at pro.bY.a(ProGuard:112)
at pro.P.a(ProGuard:66)
at pro.p.a(ProGuard:83)
at pro.bU.a(ProGuard:69)
at pro.bo.a(ProGuard:356)
at pro.J.a(ProGuard:149)
at pro.I.a(ProGuard:49)
at pro.J.a(ProGuard:105)
at pro.cf.c(ProGuard:370)
at pro.cf.a(ProGuard:317)
at pro.bc.a(ProGuard:55)
at proguard.ProGuard.a(ProGuard:363)
at proguard.ProGuard.c(ProGuard:187)
at proguard.ProGuard.b(ProGuard:385)
at proguard.ProGuard.main(ProGuard:429)
</pre>
<p>
We can then use the following command to recover the stack trace:
<pre>
<b>java -jar retrace.jar proguard.map proguard.trace</b>
</pre>
<p>
The output will look as follows:
<pre>
Exception in thread "main" java.lang.Error: Random exception
at proguard.shrink.UsageMarker.visitInstruction(ProGuard:576)
at proguard.classfile.instruction.GenericInstruction.accept(ProGuard:431)
at proguard.classfile.CodeAttrInfo.instructionsAccept(ProGuard:145)
at proguard.shrink.UsageMarker.visitCodeAttrInfo(ProGuard:522)
at proguard.classfile.CodeAttrInfo.accept(ProGuard:129)
at proguard.classfile.ProgramMemberInfo.attributesAccept(ProGuard:125)
at proguard.shrink.UsageMarker.visitMemberInfo(ProGuard:251)
at proguard.shrink.UsageMarker.visitProgramMethodInfo(ProGuard:229)
at proguard.classfile.ProgramMethodInfo.accept(ProGuard:55)
at proguard.classfile.ProgramClassFile.methodAccept(ProGuard:405)
at proguard.classfile.visitor.NamedMethodVisitor.visitProgramClassFile(ProGuard:51)
at proguard.classfile.ProgramClassFile.accept(ProGuard:356)
at proguard.classfile.visitor.ClassFileUpDownTraveler.visitProgramClassFile(ProGuard:109)
at proguard.classfile.ProgramClassFile.accept(ProGuard:356)
at proguard.classfile.visitor.ClassFileUpDownTraveler.visitLibraryClassFile(ProGuard:186)
at proguard.classfile.LibraryClassFile.accept(ProGuard:369)
at proguard.shrink.UsageMarker.visitLibraryMethodInfo(ProGuard:286)
at proguard.classfile.LibraryMethodInfo.accept(ProGuard:55)
at proguard.classfile.LibraryClassFile.methodsAccept(ProGuard:408)
at proguard.shrink.UsageMarker.visitLibraryClassFile(ProGuard:190)
at proguard.classfile.LibraryClassFile.accept(ProGuard:369)
at proguard.classfile.ClassCpInfo.referencedClassAccept(ProGuard:110)
at proguard.shrink.UsageMarker.visitClassCpInfo(ProGuard:449)
at proguard.classfile.ClassCpInfo.accept(ProGuard:99)
at proguard.classfile.ProgramClassFile.constantPoolEntryAccept(ProGuard:372)
at proguard.shrink.UsageMarker.markCpEntry(ProGuard:649)
at proguard.shrink.UsageMarker.visitProgramClassFile(ProGuard:112)
at proguard.classfile.visitor.VariableClassFileVisitor.visitProgramClassFile(ProGuard:66)
at proguard.classfile.visitor.MultiClassFileVisitor.visitProgramClassFile(ProGuard:83)
at proguard.classfile.visitor.FilteredClassFileVisitor.visitProgramClassFile(ProGuard:69)
at proguard.classfile.ProgramClassFile.accept(ProGuard:356)
at proguard.classfile.ClassPool.classFileAccept(ProGuard:149)
at proguard.classfile.visitor.NamedClassFileVisitor.visitClassPool(ProGuard:49)
at proguard.classfile.ClassPool.accept(ProGuard:105)
at proguard.KeepCommand.executeShrinkingPhase(ProGuard:370)
at proguard.KeepCommand.execute(ProGuard:317)
at proguard.CompoundCommand.execute(ProGuard:55)
at proguard.ProGuard.executeCommands(ProGuard:363)
at proguard.ProGuard.shrink(ProGuard:187)
at proguard.ProGuard.execute(ProGuard:385)
at proguard.ProGuard.main(ProGuard:429)
</pre>
<h3><a name="withverbose">Restoring a stack trace with line numbers (verbose)</a></h3>
In the previous example, we could also use the verbose flag:
<pre>
<b>java -jar retrace.jar -verbose proguard.map proguard.trace</b>
</pre>
<p>
The output will then look as follows:
<pre>
Exception in thread "main" java.lang.Error: Random exception
at proguard.shrink.UsageMarker.void visitInstruction(proguard.classfile.ClassFile,proguard.classfile.instruction.Instruction)(ProGuard:576)
at proguard.classfile.instruction.GenericInstruction.void accept(proguard.classfile.ClassFile,proguard.classfile.instruction.InstructionVisitor)(ProGuard:431)
at proguard.classfile.CodeAttrInfo.void instructionsAccept(proguard.classfile.ClassFile,proguard.classfile.instruction.InstructionVisitor)(ProGuard:145)
at proguard.shrink.UsageMarker.void visitCodeAttrInfo(proguard.classfile.ClassFile,proguard.classfile.CodeAttrInfo)(ProGuard:522)
at proguard.classfile.CodeAttrInfo.void accept(proguard.classfile.ClassFile,proguard.classfile.visitor.AttrInfoVisitor)(ProGuard:129)
at proguard.classfile.ProgramMemberInfo.void attributesAccept(proguard.classfile.ProgramClassFile,proguard.classfile.visitor.AttrInfoVisitor)(ProGuard:125)
at proguard.shrink.UsageMarker.void visitMemberInfo(proguard.classfile.ProgramClassFile,proguard.classfile.ProgramMemberInfo)(ProGuard:251)
at proguard.shrink.UsageMarker.void visitProgramMethodInfo(proguard.classfile.ProgramClassFile,proguard.classfile.ProgramMethodInfo)(ProGuard:229)
at proguard.classfile.ProgramMethodInfo.void accept(proguard.classfile.ProgramClassFile,proguard.classfile.visitor.MemberInfoVisitor)(ProGuard:55)
at proguard.classfile.ProgramClassFile.void methodAccept(proguard.classfile.visitor.MemberInfoVisitor,java.lang.String,java.lang.String)(ProGuard:405)
at proguard.classfile.visitor.NamedMethodVisitor.void visitProgramClassFile(proguard.classfile.ProgramClassFile)(ProGuard:51)
at proguard.classfile.ProgramClassFile.void accept(proguard.classfile.visitor.ClassFileVisitor)(ProGuard:356)
at proguard.classfile.visitor.ClassFileUpDownTraveler.void visitProgramClassFile(proguard.classfile.ProgramClassFile)(ProGuard:109)
at proguard.classfile.ProgramClassFile.void accept(proguard.classfile.visitor.ClassFileVisitor)(ProGuard:356)
at proguard.classfile.visitor.ClassFileUpDownTraveler.void visitLibraryClassFile(proguard.classfile.LibraryClassFile)(ProGuard:186)
at proguard.classfile.LibraryClassFile.void accept(proguard.classfile.visitor.ClassFileVisitor)(ProGuard:369)
at proguard.shrink.UsageMarker.void visitLibraryMethodInfo(proguard.classfile.LibraryClassFile,proguard.classfile.LibraryMethodInfo)(ProGuard:286)
at proguard.classfile.LibraryMethodInfo.void accept(proguard.classfile.LibraryClassFile,proguard.classfile.visitor.MemberInfoVisitor)(ProGuard:55)
at proguard.classfile.LibraryClassFile.void methodsAccept(proguard.classfile.visitor.MemberInfoVisitor)(ProGuard:408)
at proguard.shrink.UsageMarker.void visitLibraryClassFile(proguard.classfile.LibraryClassFile)(ProGuard:190)
at proguard.classfile.LibraryClassFile.void accept(proguard.classfile.visitor.ClassFileVisitor)(ProGuard:369)
at proguard.classfile.ClassCpInfo.void referencedClassAccept(proguard.classfile.visitor.ClassFileVisitor)(ProGuard:110)
at proguard.shrink.UsageMarker.void visitClassCpInfo(proguard.classfile.ClassFile,proguard.classfile.ClassCpInfo)(ProGuard:449)
at proguard.classfile.ClassCpInfo.void accept(proguard.classfile.ClassFile,proguard.classfile.visitor.CpInfoVisitor)(ProGuard:99)
at proguard.classfile.ProgramClassFile.void constantPoolEntryAccept(proguard.classfile.visitor.CpInfoVisitor,int)(ProGuard:372)
at proguard.shrink.UsageMarker.void markCpEntry(proguard.classfile.ClassFile,int)(ProGuard:649)
at proguard.shrink.UsageMarker.void visitProgramClassFile(proguard.classfile.ProgramClassFile)(ProGuard:112)
at proguard.classfile.visitor.VariableClassFileVisitor.void visitProgramClassFile(proguard.classfile.ProgramClassFile)(ProGuard:66)
at proguard.classfile.visitor.MultiClassFileVisitor.void visitProgramClassFile(proguard.classfile.ProgramClassFile)(ProGuard:83)
at proguard.classfile.visitor.FilteredClassFileVisitor.void visitProgramClassFile(proguard.classfile.ProgramClassFile)(ProGuard:69)
at proguard.classfile.ProgramClassFile.void accept(proguard.classfile.visitor.ClassFileVisitor)(ProGuard:356)
at proguard.classfile.ClassPool.void classFileAccept(proguard.classfile.visitor.ClassFileVisitor,java.lang.String)(ProGuard:149)
at proguard.classfile.visitor.NamedClassFileVisitor.void visitClassPool(proguard.classfile.ClassPool)(ProGuard:49)
at proguard.classfile.ClassPool.void accept(proguard.classfile.visitor.ClassPoolVisitor)(ProGuard:105)
at proguard.KeepCommand.void executeShrinkingPhase(proguard.classfile.ClassPool,proguard.classfile.ClassPool)(ProGuard:370)
at proguard.KeepCommand.void execute(int,proguard.classfile.ClassPool,proguard.classfile.ClassPool)(ProGuard:317)
at proguard.CompoundCommand.void execute(int,proguard.classfile.ClassPool,proguard.classfile.ClassPool)(ProGuard:55)
at proguard.ProGuard.void executeCommands(int)(ProGuard:363)
at proguard.ProGuard.void shrink()(ProGuard:187)
at proguard.ProGuard.void execute(java.lang.String[])(ProGuard:385)
at proguard.ProGuard.void main(java.lang.String[])(ProGuard:429)
</pre>
<h3><a name="without">Restoring a stack trace without line numbers</a></h3>
Assume for instance ProGuard itself has been obfuscated using the following
extra options, this time without preserving the line number tables:
<pre>
-printmapping proguard.map
</pre>
<p>
A stack trace <code>proguard.trace</code> will then lack line number
information:
<pre>
Exception in thread "main" java.lang.Error: Random exception
at pro.bY.a(Unknown Source)
at pro.bO.a(Unknown Source)
at pro.bj.a(Unknown Source)
at pro.bY.a(Unknown Source)
at pro.bj.a(Unknown Source)
at pro.bN.a(Unknown Source)
at pro.bY.a(Unknown Source)
at pro.bY.a(Unknown Source)
at pro.l.a(Unknown Source)
at pro.bo.b(Unknown Source)
at pro.ci.a(Unknown Source)
at pro.bo.a(Unknown Source)
at pro.be.a(Unknown Source)
at pro.bo.a(Unknown Source)
at pro.be.a(Unknown Source)
at pro.bg.a(Unknown Source)
at pro.bY.a(Unknown Source)
at pro.bh.a(Unknown Source)
at pro.bg.b(Unknown Source)
at pro.bY.a(Unknown Source)
at pro.bg.a(Unknown Source)
at pro.M.a(Unknown Source)
at pro.bY.a(Unknown Source)
at pro.M.a(Unknown Source)
at pro.bo.a(Unknown Source)
at pro.bY.a(Unknown Source)
at pro.bY.a(Unknown Source)
at pro.P.a(Unknown Source)
at pro.p.a(Unknown Source)
at pro.bU.a(Unknown Source)
at pro.bo.a(Unknown Source)
at pro.J.a(Unknown Source)
at pro.I.a(Unknown Source)
at pro.J.a(Unknown Source)
at pro.cf.c(Unknown Source)
at pro.cf.a(Unknown Source)
at pro.bc.a(Unknown Source)
at proguard.ProGuard.a(Unknown Source)
at proguard.ProGuard.c(Unknown Source)
at proguard.ProGuard.b(Unknown Source)
at proguard.ProGuard.main(Unknown Source)
</pre>
<p>
We can still use the same command to recover the stack trace:
<pre>
<b>java -jar retrace.jar proguard.map proguard.trace</b>
</pre>
<p>
The output will now give a list of alternative original method names for each
ambiguous obfuscated method name:
<pre>
Exception in thread "main" java.lang.Error: Random exception
at proguard.shrink.UsageMarker.visitProgramClassFile(Unknown Source)
visitLibraryClassFile
visitProgramFieldInfo
visitProgramMethodInfo
visitMemberInfo
visitLibraryFieldInfo
visitLibraryMethodInfo
visitIntegerCpInfo
visitLongCpInfo
visitFloatCpInfo
visitDoubleCpInfo
visitStringCpInfo
visitUtf8CpInfo
visitFieldrefCpInfo
visitInterfaceMethodrefCpInfo
visitMethodrefCpInfo
visitClassCpInfo
visitNameAndTypeCpInfo
visitUnknownAttrInfo
visitInnerClassesAttrInfo
visitConstantValueAttrInfo
visitExceptionsAttrInfo
visitCodeAttrInfo
visitLineNumberTableAttrInfo
visitLocalVariableTableAttrInfo
visitSourceFileAttrInfo
visitDeprecatedAttrInfo
visitSyntheticAttrInfo
visitInstruction
visitCpInstruction
visitExceptionInfo
visitInnerClassesInfo
visitLocalVariableInfo
markCpEntry
markAsUnused
isUsed
at proguard.classfile.instruction.GenericInstruction.create(Unknown Source)
isWide
getLength
accept
at proguard.classfile.CodeAttrInfo.getAttribute(Unknown Source)
getAttrInfoLength
readInfo
accept
instructionsAccept
exceptionsAccept
[...]
at proguard.KeepCommand.executeShrinkingPhase(Unknown Source)
access$100
at proguard.KeepCommand.keepField(Unknown Source)
ensureMultiClassFileVisitorForMembers
execute
executeObfuscationPhase
access$002
access$000
access$102
access$108
at proguard.CompoundCommand.addCommand(Unknown Source)
execute
at proguard.ProGuard.readCommands(Unknown Source)
obfuscate
executeCommands
at proguard.ProGuard.shrink(Unknown Source)
at proguard.ProGuard.check(Unknown Source)
execute
at proguard.ProGuard.main(Unknown Source)
</pre>
<hr />
<address>
Copyright © 2002-2014
<a target="other" href="http://www.lafortune.eu/">Eric Lafortune</a> @ <a target="top" href="http://www.saikoa.com/">Saikoa</a>.
</address>
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