jboss-dev-forums

[Jboss-dev-forums] [Javassist development Forum] - Re: Array access

[chiba <do-...@jb...>]

Implementing this spec. would be tricky.  Because:


  | test.array[5] = 10;
  | 

is compiled into:


  | long[] a = test.array;
  | a[5] = 10;
  | 

It would be difficult to recognize "a" is "test.array" when Javassist transforms "a[5] = 10".




View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=3953807#3953807

Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&p=3953807

[Jboss-dev-forums] [Javassist development Forum] - Re: Array access

[<ben...@jb...>]

So in other words, neither AspectJ (or asm) can do this? Just to confirm.


View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=3954570#3954570

Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&p=3954570

[Jboss-dev-forums] [Javassist development Forum] - Re: Array access

[<bst...@jb...>]

Jonas Boner told me they can track changes to arrays.  He said how but I had no idea what he meant and was doing a presentation at the time so couldn't really follow up.

View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=3954585#3954585

Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&p=3954585

[Jboss-dev-forums] [Javassist development Forum] - Re: Array access

[<jas...@jb...>]

"chiba" wrote : Implementing this spec. would be tricky.  Because:
  | 
  | 
  |   | test.array[5] = 10;
  |   | 
  | 
  | is compiled into:
  | 
  | 
  |   | long[] a = test.array;
  |   | a[5] = 10;
  |   | 
  | 
  | It would be difficult to recognize "a" is "test.array" when Javassist transforms "a[5] = 10".
  | 
  | 
  | 

It seems this isn't the case for the sun compiler:

 20:  getfield        #2; //Field array:[J
 23:  iconst_5
 24:  lconst_1
 25:  lastore

Or did you mean that a user can assign it to a local var and manipulate it there?

In that case, couldnt you store a reference map from local vars to arrays you are interested in?

-Jason


View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=3954588#3954588

Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&p=3954588

[Jboss-dev-forums] [Javassist development Forum] - Re: Array access

[<kab...@jb...>]

Hi Chiba,

I heard from Emmanuel that you'd discussed array interception with him and that it might be possible, but with some limitations.

Could you please explain the limitations a bit?

In particular Emmanuel mentioned differences between different compilers and reassignment of the array variables. As a first cut, I think it would be fine to not allow reassignment of variables, but the Hibernate and POJOCache guys will need to  verify if this works for them.

Thanks,

Kabir

View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=3955764#3955764

Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&p=3955764