debugging an existing process

[Wu Zhou <woodzltc at cn dot ibm dot com>]

I see that debugging existing process can be used now. So I give it  
some try.  I am very happy to see that register/memory window work ok.  
 The source window can also be opened in some situation.  But I also  
have some comments/questions for this:

1.  If the process has no debug information, you will see nothing in  
the source window; if the process is executing into some library  
function, you will also see nothing in the source window.  So is it  
better for us to have some mechanism to differentiate these two  
different situation?

My suggestion is like this: if the current stack frame has no  
debuginfo, but the current process does have, we can show some message  
like this:  "no debug information for this stack, but we do have debug  
information for this process, would you like to see the source for the  
process?".

This can give the user more choice to see the source code.

2. When the current stack frame has no debug information available,  
the current frysk view will display "unknown file: unknown function".   
In my opinion, it might be better to display the instruction address  
of the current stack.

3. In the register view, if we can copy the value of some or all the  
registers' value, that will be helpful.

4. The menu items in program tab are all disabled.  Did this mean we  
can't control the process at this time?

Regards
- Wu Zhou