[PRL] AOP questions

[Jeffrey Palm]

Pengcheng Wu wrote:

> 
> On Tue, 29 Mar 2005, John Clements wrote:
>>2) "Join Points":
>>	It appears to me that join points are not truly points, but are rather
>>contiguous subsequences.  I say this because of the existence of things
>>like "around" and "after" pcds, which don't make sense for a definition
>>of join points as single points in a program's execution.  Is this
>>fair?
> 
> 
> I am not sure I understand this part.
> 

Again, doug already pointed out "around" and "after" are advice 
directives.

Join points are _points_ not sequences, and PCDs select a set of join 
points, which is a subset of all points in the execution.  They need not 
be contiguous.  For example, "in the flow of A and not B" could be a PCD 
where A and B are themselves PCDs -- i.e. while A is somewhere above us 
on the stack and we're at an execution point that's not B.  Obviously 
this selects a non-contiguous set of points in the execution.

Jeff
-- 
Jeffrey Palm --> http://www.ccs.neu.edu/home/jpalm