Re: injecting code to exception handler

Thanks for the info.  I was thinking about the same approach too. Haven't
implemented it yet, but I guess that's the best but not so straight-forward
solution thus far.

Bing



2014-04-22 21:51 GMT+08:00 Eliot Moss <[email protected]>:

> On 4/17/2014 12:01 AM, Bing Ran wrote:
>
>  Wondering how I can inject some code in the beginning of all the catch
>> blocks. I don't seem to be
>> able to find the proper method to override in a MethodVisitor.
>>
>
> I don't recall what responses have been posed (maybe even by me),
> but here are some quick thoughts:
>
> 1) You'll need to process the try-catch block information and
> remember the labels of the starts of handlers -- perhaps in a
> HashSet.
>
> 2) As you encounter Label's in the code (visitLabel) check to
> see if the Label is one in your HashSet, which implies it is
> at the start of a handler.  *After* doing a super.visitLabel
> call, do your calls to insert code.
>
> I have often found it to be the case that interesting transformations
> require a certain amount of tracking/analysis of the stream of
> instructions and other related info, and selective transformation
> based on context.
>
> Regards -- Eliot Moss
>

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