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Re: trace-calls-to-procedure
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From: |
Tim Van den Langenbergh |
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Subject: |
Re: trace-calls-to-procedure |
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Date: |
Fri, 25 Dec 2020 13:37:46 +0100 |
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User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.6.0 |
On 25/12/2020 05:51, Tim Meehan wrote:
I have used ",trace" before and get what it is supposed to do, but I am not
sure what "trace-calls-to-procedure" is supposed to do ...
;; Using Guile 3.0.4
(use-modules (system vm trace))
(define (sqr x)
(* x x))
(trace-calls-to-procedure sqr)
(sqr 3)
;; ... and nothing happens ... is something supposed to happen?
trace-calls-to-procedure is a low-level trace procedure that returns a
trap that you have to install in the trap state. You can either use the
add-trap! procedure from (use-modules system vm trap-state), or use the
add-trace-at-procedure-call! procedure from the same module.
That said, there seems to be a bug in add-trace-at-procedure-call! which
I'm having a hard time figuring out... c'est la vie.
Vale
-Tim Van den Langenbergh
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