Re: Re: byte code transformation checking

I integrated CheckClassAdapter in my bytecode transformer as preconized in CheckClassAdapter javadoc class header.

The "CheckClassAdapter.verify(new ClassReader(code), false, pw);" invokation gives:
  java.lang.ArrayIndexOutOfBoundsException: 65
  at net.sf.joafip.asm.ClassReader.readLabel(ClassReader.java:1744)
  at net.sf.joafip.asm.ClassReader.readFrameType(ClassReader.java:1724)
  at net.sf.joafip.asm.ClassReader.accept(ClassReader.java:1237)
  at net.sf.joafip.asm.ClassReader.accept(ClassReader.java:436)
  at net.sf.joafip.asm.util.CheckClassAdapter.verify(CheckClassAdapter.java:207)
  at net.sf.joafip.asm.util.CheckClassAdapter.verify(CheckClassAdapter.java:253)
  at net.sf.joafip.store.service.bytecode.agent.PersistableCodeGenerator.generate(PersistableCodeGenerator.java:216)
  at net.sf.joafip.store.service.bytecode.agent.PersistableTransformer.transform(PersistableTransformer.java:89)
  at net.sf.joafip.store.service.bytecode.agent.MainTransformerTest.run(MainTransformerTest.java:77)
  at net.sf.joafip.store.service.bytecode.agent.MainTransformerTest.main(MainTransformerTest.java:49)

That is the same error when check the class reading bytecode in file. The file is not corrupted.

I dicovered that I must set the class writer option flag with "ClassWriter.COMPUTE_FRAMES" because I add surronding try {} finally{} to the mehods code.

Unfortunately, the class reader does not explicity complains about a frame structure error.

Regards
Luc

----- Original Message ----- 
From: "Eugene Kuleshov" <[email protected]>
To: <[email protected]>
Sent: Wednesday, October 13, 2010 4:58 AM
Subject: [asm] Re: byte code transformation checking


> 
>  First of all, ASM isn't designed to work with broken bytecode 
> structures. In other words, the bytecode must be readable and I suspect 
> you may have an incompletely saved file.
> 
>  But if you are certain that file is intact, in this case it haven't 
> got to the CheckClassAdapter, because of the broken bytecode structures. 
> To deal with that you need to put the CheckClassAdapter into your 
> visitors chain before the ClassWriter and make sure it passes trough.
> 
>  regards,
>  Eugene
> 
> 
> luc peuvrier at home wrote:
>> Hi,
>>  
>> I run CheckClassAdapter main with 
>> "logs/classes/org/eclipse/jdt/internal/junit/runner/RemoteTestRunner.class" 
>> as argument.
>> And I have the here below error:
>>  
>>
>>     Exception in thread "main"
>>     _java.lang.ArrayIndexOutOfBoundsException_: 2
>>     at
>>     net.sf.joafip.asm.ClassReader.readFrameType(_ClassReader.java:1699_)
>>     at net.sf.joafip.asm.ClassReader.accept(_ClassReader.java:1237_)
>>     at net.sf.joafip.asm.ClassReader.accept(_ClassReader.java:436_)
>>     at
>>     net.sf.joafip.asm.util.CheckClassAdapter.verify(_CheckClassAdapter.java:207_)
>>     at
>>     net.sf.joafip.asm.util.CheckClassAdapter.verify(_CheckClassAdapter.java:253_)
>>     at
>>     net.sf.joafip.asm.util.CheckClassAdapter.main(_CheckClassAdapter.java:185_)
>>
>>  
>> I expect CheckClassAdapter say to me that is wrong in RemoteTestRunner 
>> class.
>>  
>> Best regards
>> Luc
> 
>


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