From: Holger Blasum <holgerlists@blasum.net>
Subject: guile-debugging: how to access source properties from trap context
Date: Sun, 1 Jan 2006 22:33:51 +0100 [thread overview]
Message-ID: <20060101213351.GA5366@tosh> (raw)
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Hello guile-user,
in the "Guile Debugging Enhancements" tutorial
(http://download.gna.org/guile-debugging/guile-debugging.html)
there is encouragement to play with the source trap context
parameters.
What I want to look at are the source file names and
line numbers like eg in any gdb stepping session of a C program
say for matrix multiplication like:
gdb -f a.out
(gdb) br main
Breakpoint 1 at 0x8048417: file matrix.c, line 11.
(gdb) run
Starting program: /home/blasum/a/comp/sema/sample/c/samples/a.out
/home/blasum/a/comp/sema/sample/c/samples/matrix.c:12
(gdb) step
/home/blasum/a/comp/sema/sample/c/samples/matrix.c:13
(gdb) step
/home/blasum/a/comp/sema/sample/c/samples/matrix.c:14
(gdb) step
...
How can one access file name and line number of the source
properties in guile-debugging?
My first shot was at
$ guile
guile> (use-modules (ice-9 debugger) (ossau
ice-9-debugger-extensions) (ossau traps) (ossau trace))
guile> (load "matrix.scm")
guile> (define (report-exp trap-context)
(display "Expression: ")
(display (tc:expression trap-context))
(newline))
guile> (install-trap (make <procedure-trap> #:procedure mkmatrix
#:behaviour (list report-exp)))
guile> (do-main 4)
Expression: #f
Expression: #f
guile>
However expression (#f might be ok, because we are dealing
with vectors, and it *is* called twice) is the wrong
attribute what I'm really looking for is not the evaluated
expression (nor its uninterpreted source text) but its
source text's file name and line number ;)
Any hints (even if they involve twiddling with traps.scm) very
welcome ... (Credits for the matrix multiplication sample
are to Peter Williams, matrix multiplication is not really
what I am interested in but is perhaps a good example for
testing a stepper.)
Happy 2006,
--
Holger Blasum +49-174-7313590 (gsm) GnuPG 1024D/ACDFC3B769DC1ED66B47
"It has turned out that the networking of many small computers, at many
places, is more efficient than the one supercomputer - the success of
the internet is based on this principle." - Angela Merkel, government
declaration, 30 Nov 2005
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next reply other threads:[~2006-01-01 21:33 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-01-01 21:33 Holger Blasum [this message]
2006-01-02 0:18 ` guile-debugging: how to access source properties from trap context Neil Jerram
2006-01-02 12:39 ` Neil Jerram
2006-01-02 22:33 ` Holger Blasum
2006-01-03 22:57 ` Neil Jerram
2006-01-07 16:54 ` Holger Blasum
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