Re: Re: instrumenting try block

Hi,

Thank you so much, ASM is so powerful that it automatically
corrects error from user :)

Yudi

On Sat, Jul 30, 2011 at 12:49 PM, Eric Bruneton <[email protected]> wrote:

> Hi,
>
>
> 18/07/2011 18:56, Yudi Zheng wrote:
>
>> Hi,
>>
>> We are trying to insert new code section into existing exception handler.
>> In an example below is just simplified scenario, but we are using similar
>> code to insert try-finally into methods.
>>
>> We have encountered buggy behavior when using COMPUTE_FRAMES
>>  in conjunction with COMPUTE_MAXS within ClassWriter.
>>
>> The following code (for full runnable code see attachments) produces
>> Java VerifyError. If we use the Class writer twice in a row at the end,
>> the produced result is as expected.
>>
>> Do you have any idea, what can cause the error?
>>
>
>     ilst.insert(handler, new IntInsnNode(Opcodes.ALOAD,
>>    method.maxLocals));
>>    ilst.insert(handler, new IntInsnNode(Opcodes.ASTORE,
>>    method.maxLocals));
>>
>
> the error is that you used IntInsnNode instead of VarInsnNode. This type of
> error can easily be detected with a CheckClassAdapter:
>
> // Transform into bytecode
> ClassWriter cw = new ClassWriter(ClassWriter.**COMPUTE_FRAMES);
> ClassVisitor cv = new CheckClassAdapter(cw);
> cn.accept(cv);
>
> Eric
>
>
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