GNU bug report logs - #26027
(system vm trace) creates no output

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Message #5 received at submit <at> debbugs.gnu.org (full text, mbox):

From: Mike Gran <spk121 <at> yahoo.com>
To: Bug Guile <bug-guile <at> gnu.org>
Subject: (system vm trace) creates no output
Date: Wed, 8 Mar 2017 17:01:58 +0000 (UTC)

Hi-
I created the following file, which I ran under guile-2.0 and master.
There is no tracing output. What am I misunderstanding?
(use-modules 
(system vm trace)) 

(define (write-hi) 
(write "hi")) 

(define (outer) 
(write-hi)) 

(trace-calls-to-procedure write-hi) 
(trace-calls-in-procedure write-hi) 
(trace-instructions-in-procedure write-hi) 
(outer) 

Thanks,
Mike Gran

Message #8 received at 26027 <at> debbugs.gnu.org (full text, mbox):

From: Andy Wingo <wingo <at> igalia.com>
To: Mike Gran <spk121 <at> yahoo.com>
Cc: 26027 <at> debbugs.gnu.org
Subject: Re: bug#26027: (system vm trace) creates no output
Date: Wed, 19 Apr 2017 17:07:31 +0200

On Wed 08 Mar 2017 18:01, Mike Gran <spk121 <at> yahoo.com> writes:

> Hi-
> I created the following file, which I ran under guile-2.0 and master.
> There is no tracing output. What am I misunderstanding?
> (use-modules 
> (system vm trace)) 
>
> (define (write-hi) 
> (write "hi")) 
>
> (define (outer) 
> (write-hi)) 
>
> (trace-calls-to-procedure write-hi) 
> (trace-calls-in-procedure write-hi) 
> (trace-instructions-in-procedure write-hi) 
> (outer) 

Weird.  From an initial glance I don't know why this isn't working.
Irritating!

Andy

Message #11 received at 26027 <at> debbugs.gnu.org (full text, mbox):

From: Tim Van den Langenbergh <tmt_vdl <at> gmx.com>
To: 26027 <at> debbugs.gnu.org
Subject: Re: bug#26027: (system vm trace) creates no output
Date: Fri, 25 Dec 2020 15:45:52 +0100

[Message part 1 (text/plain, inline)]

The various trace commands create VM traps that you have to install to 
the thread-local trap state. See API Reference/Debugging/Traps/Trap 
States in the  manual.

-Tim Van den Langenbergh

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