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Re: What debugger breakpoint features would you like?
From: |
Rob Browning |
Subject: |
Re: What debugger breakpoint features would you like? |
Date: |
Mon, 04 Feb 2002 15:09:17 -0600 |
User-agent: |
Gnus/5.090006 (Oort Gnus v0.06) Emacs/21.1 (i386-debian-linux-gnu) |
Neil Jerram <address@hidden> writes:
> I don't think there's any problem per se in using traps. The
> practical difficulty is that the raw evaluator-traps interface doesn't
> give any support for different applications (debugger, profiler, trace
> etc.) sharing those traps. Part of what I'm trying to work out with
> the debugger work is what a sensible shareable traps interface might
> look like. I'd definitely like/need to throw the needs of the
> profiler into that mix at some point.
I think that's the problem I was remembering. In general, for
profiling, you'd like really quick responses, and you *need* to be
able to minimize any skew the time spent in the infrastructure might
introduce, though as long as you can successfully grab the time
appropriately, you can subtract it out.
> Not sure what you mean here; can you explain further? Tail recursion
> certainly complicates the use of traps, but I think they give you just
> enough information to work everything out.
I mean that if you want to write a profiler that uses function
entry/exit traps to gather precise information (like gprof?), it seems
like you might have a hard time doing that from the scheme level in
guile, at least for tail recursive functions, without terribly skewing
the results. Though there may be a clever way around this, it seems
like the naive way of grabbing the time when you enter the function,
and then again when you exit it and subtracting, immediately turns a
tail recursive function into one that grows the stack on every call.
Though perhaps /me is missing something obvious :>
--
Rob Browning
rlb @defaultvalue.org, @linuxdevel.com, and @debian.org
Previously @cs.utexas.edu
GPG=1C58 8B2C FB5E 3F64 EA5C 64AE 78FE E5FE F0CB A0AD
Re: What debugger breakpoint features would you like?, Alex Shinn, 2002/02/01
Re: What debugger breakpoint features would you like?, Rob Browning, 2002/02/03
Re: What debugger breakpoint features would you like?, wawrzin, 2002/02/02