Re: [aspectj-dev] Array access

[Matthew Webster <matthew_webster@xxxxxxxxxx>]

Christian,

>However, for my application it is crucial
>to find out what kind of access (read or write of an array cell) happened.
>Is there a way to do so?

No, because unfortunately you cannot
advise the array element get/set only the field itself. Before you can
access an array element you must first access the field. In the example
the statement "ints[0] = 999;" actually comprises 2 join points
of which only the first, accessing the "ints" field, is currently
part of the AspectJ language.

I have added a comment to https://bugs.eclipse.org/bugs/show_bug.cgi?id=157031.

Matthew Webster
AOSD Project
Java Technology Centre, MP146
IBM Hursley Park, Winchester,  SO21 2JN, England
Telephone: +44 196 2816139 (external) 246139 (internal) 
Email: Matthew Webster/UK/IBM @ IBMGB, matthew_webster@xxxxxxxxxx
http://w3.hursley.ibm.com/~websterm/

Christian Hammer <chammer@xxxxxxxxxx>
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13/09/2006 15:08

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Subject	Re: [aspectj-dev] Array access

Thanks Matthew.

Actually, the index is not my priority. Currently, both array get and array
set bytecodes (accessing only one cell) are captured by the get pointcut
in
the last advice in your example. However, for my application it is crucial
to find out what kind of access (read or write of an array cell) happened.
Is there a way to do so?




                    
                     
                     
          
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Christian,

You can advise array constructions (
https://bugs.eclipse.org/bugs/show_bug.cgi?id=77166) and access.
Unfortunately you cannot (yet) determine the index used when access and
array or the identity of the element. In the example below the object
traced is the array itself:

public class Test {

        private static int[] ints;

        public static void main(String[] args) {
                ints = new int[1];
                ints[0] = 999;
                System.out.println("Test.main()
ints[0]=" + ints);
        }

}

public aspect Aspect {

        after() returning(Object ret): call(int[].new(..))
{
                System.out.println("Aspect.afterReturning()
" +
thisJoinPoint + ", ret=" + ret);
        }

        before (Object arg) : set(int[] *) &&
args(arg){
                System.out.println("Aspect.before()
" + thisJoinPoint + ",
arg=" + arg);
        }

        after () returning(Object ret) : get(int[]
*) {
                System.out.println("Aspect.after()
" + thisJoinPoint + ",
ret=" + ret);
        }
}



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