[Info-vax] Debugging shareable images on Integrity

[glen herrmannsfeldt]

jcwoman1963 at hotmail.com wrote:
 
> I wish I could post code for you guys, but this is a small but
> integral piece of a very large system.  One of my coworkers commented
> that he often pulls the code out of the shareable image and copies it
> into his local application when he needs to debug, but it's alot of
> work and he usually ends up quadrupling the size of his program just
> to debug something.  I can do that, but would like to avoid it if at
> all possible.  So nobody here has come across this odd behavior
> before?

Many debuggers work by modifying the code in memory.  Putting a 
trap instruction at a breakpoint, which then allows the debugger
to take control, replace the instruction and put a trap after
it, or execute it somewhere else.  In any case, that doesn't
work so will with sharable code.

-- glen