Re: A tcl command logger?

From: Don Porter (dgp_at_email.nist.gov)
Date: 03/24/05 

Date: 24 Mar 2005 21:02:56 GMT

Helmut Giese wrote:
>> newer versions of Tcl allow you to set traces on command execution,
>> and even fine-graining this whether you want to trace 'enter' or
>> 'leave'

George Petasis wrote:
> Thank you both for your answers. However, as it has to run to
> tcl 8.4,

Execution traces are in Tcl 8.4.

> What was
> surprising though was to find that the 'if' command calls
> 'expr' to make the evaluation.

No, it doesn't.

> I would have expected 'if' to call the C API that
> 'expr' uses directly.

It does; why do you believe otherwise.

More precisely, the expression evaluations are compiled into bytecode,
which gets executed.

> b) If anybody messes with 'expr', also 'if' (and possibly 'while',
> 'for', etc) will be affected. Is this something expected?

"messes with 'expr'" how, exactly? 

-- 
| Don Porter          Mathematical and Computational Sciences Division |
| donald.porter@nist.gov             Information Technology Laboratory |
| http://math.nist.gov/~DPorter/                                  NIST |
|______________________________________________________________________|

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