[Openmcl-devel] Trying to build a single stepper

Ron Garret ron at flownet.com
Thu Jan 18 08:17:24 PST 2018

Rather than write your own wrapper you should consider using the advice facility built in to CCL:


On Jan 18, 2018, at 7:41 AM, 73budden . <budden73 at gmail.com> wrote:

> Hi!
> I'm trying to build a single stepper for compiled functions in CCL
> (vanilla "Visual Basic" like "debugger").
> My current idea is to find all function references (subset of
> ccl::lfunloop scope) and
> replace all of them with function wrappers. E.g. I have a function
> which I want to make steppable:
> (defun f () (print 'list))
> It references PRINT as a symbol.
> (lfunloop for v in #'f do (print v)) returns:
> F
> Then I do:
> CCL>(compile (defun my-wrapped-print (&rest args) (break "About to
> call print with ~S" args) (apply #'print args)))
> And
> CCL>(%set-nth-immediate #'f 1 'MY-WRAPPED-PRINT)
> Then, when I run (f), debugger is invoked while trying to call
> "print". In current example #'f is too trivial and it isn't shown on
> the backtrace, but if we make more complex f and put it into the
> source file, I can see its source with SWANK debugger.
> So the question is: how do I say 'print (which is used as a function)
> from 'list (which is used as mere data). If I treat any symbol
> reference as a function, this would be obviously wrong.
> As far as I can get it, I have to track how symbols are referenced. I
> found already that #<acode immediate (PRINT)> is created in the
> nx1-call-form, so I think I can extend acode to include the type of
> reference. Also I found how info is extracted. So I can add a
> bit-vector to a functions data which stores "1" if nth-immediate is a
> function and 0 otherwise. But still I'm unable to find where this
> immediate is recorded into the generated code, so I don't know how to
> extend the set. Can anyone please give a hint?
> Also, if my approach is definitely wrong somehow, please let me know.
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