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From "Francois Valdy (JIRA)" <j...@apache.org>
Subject [jira] [Created] (FELIX-3574) IPojo bytecode manipulation looses method argument names
Date Wed, 27 Jun 2012 08:13:44 GMT
Francois Valdy created FELIX-3574:

             Summary: IPojo bytecode manipulation looses method argument names
                 Key: FELIX-3574
                 URL: https://issues.apache.org/jira/browse/FELIX-3574
             Project: Felix
          Issue Type: Bug
          Components: iPOJO
    Affects Versions: ipojo-manipulator-1.8.6
            Reporter: Francois Valdy

When IPojo creates its wrapper methods (instead of the ones it renames with '__' prefix),
it doesn't keep the local variable table information, hence loosing parameter names.
Reflection isn't impacted (as you can't access them through reflection anyway), but many tools
- decompilers will display proper names for prefixed (private) methods, but not on the non-prefixed
- IDEs won't display the names if you don't have javadoc|source attachment
- some tools that are reading bytecode won't work (http://paranamer.codehaus.org/ in my case)

Fix is pretty easy, I'll attach a patch later on:
We need to store the local variables definition on the methods (only those which correspond
to a parameter, we discard those that apply to method code variables) in the MethodDescriptor.
Then when generating the wrapping code, we put them back, with a "start label" = 0, and "end
label" = "end of wrapping code", as it seems to be the convention.

I tested the changes on 1.6.4 and they work fine, but I'll provide a patch for the trunk.


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