Re: injecting code to exception handler

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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