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Re: OT:cscope/tags

From: Perry Smith
Subject: Re: OT:cscope/tags
Date: Tue, 5 Dec 2006 21:19:22 -0600

On Dec 5, 2006, at 7:32 PM, Hadron Quark wrote:

Perry Smith <address@hidden> writes:

On Dec 5, 2006, at 4:39 PM, Hadron Quark wrote:

Perry Smith <address@hidden> writes:

cscope.  To make the db I use -q.  To invoke it via emacs, I use -q
and -d:

       -d     Do not update the cross-reference.

       -q     Enable  fast  symbol  lookup  via an inverted

Just for thread completeness, how do you add these options when
cscope from emacs? How are you accessing cscope from emacs? Which el
package do you use?

Well, its a long story. I created my own cscope.el back in 1990. I'm
happy to share it
but it has lots of weird twisted gunk in it. I have the concept of an
"inherited buffer".  Each
buffer has a buffer local variable that points back to its inherited
buffer.  In this way,
different buffers can use different cscope's and not get confused
between them.  At the

Can you expand on this? I dont understand.

I was working on debugging the entire OS. Once at Tandem, the other at IBM. At the time, it was not practical to have one cscope database for the entire OS. So I had separate cscope files for the particular areas I would be working in. So if I was editing a group of files down the path /a/b/c/d which had a cscope database in d, then all the files in d would point back to the cscope buffer using the database in d. At the same time, I might be editing and looking at files down the path /u/v/w/x which would have its own separate cscope db. All the files in x would point back to the cscope buffer using the db in x. I could look at various things in separate files and do symbol lookups, etc. There was also the problem of various build versions of the OS. Again, I could have separate db's in the various directories so foodog.h from build 1 would look at the cscope db file from build 1 while foodog.h from build 2 would look at the cscope db from build 2. This is also where I had "inherited" buffer local variables. So if I did a make in foodog.h of build 1, it
would use the proper commands for build level 1.

Did you try xcscope previously referenced? With auto database update
turned off, it works great.

I like what I have very much except that cscope does not actually truly understand C++ so it can not really find me all the references to a particular method of a particular class.

time, there was a lot of other things that were inherited besides just
the cscope information
(like build information and that sort of thing).

I also have a script called cscope-front (I've appended it to the
bottom).  I doubt if it
will do you much good either except just as a thought of calling
cscope via a script
and then that script can add and subtract arguments based upon a
number of
variables. This keeps the lisp code simpler -- I was more comfortable
writing shell
scripts than lisp code at the time.

I create the cscope database via make. The makefile creates a list of
files called cscope.files,
(usually based upon various make variables), then it calls cscope as:

cscope -q -b

(The cscope I'm using defaults to looking in cscope.files for the list
of files.)

From emacs, I call cscope-front (using my cscope.el routines). As you
can see, the script
has debug output to /tmp/doggy. Here are some sample lines from doggy:

a='' p='/home/pedz/Eclipse/SATA/src'
/usr/local/bin/cscope -d -q -l -P /home/pedz/Eclipse/SATA/src -f

The last line is all the args I use to call cscope with.

Hopefully, something in here will be useful to you.

# First arg is the string to pass to setup, second arg is the
# directory where the cscope should behave from
p=$( echo $2 | sed -e 's%/$%%' )


/bin/pwd >>  /tmp/doggy
echo "a='$a' p='$p'" >> /tmp/doggy
if [ -n "$a" ] ; then
  source ~/.setup $a
# DFS permissions are weird and I can execute things even though the
# file system says I can not.  So I only check to see if the file
# exists or not.
if [ -e cscope/bin/cscope ] ; then
elif [ -e ../cscope/bin/cscope ] ; then
elif [ -e ../../cscope/bin/cscope ] ; then

echo $CSCOPE -d -q -l -P "$p" "$@" >> /tmp/doggy
exec $CSCOPE -d -q -l -P "$p" "$@" 2>>/tmp/doggy
# echo $CSCOPE -q -l -P "'$p'" "$@" >> /tmp/doggy
# exec $CSCOPE -q -l -P "'$p'" "$@" 2>> /tmp/doggy
# echo $CSCOPE -q -l >> /tmp/doggy
# $CSCOPE -q -l 2>> /tmp/doggy

# /afs/austin/aix/project/aix41C/cscope/bin/cscope -d -q -l \
#       -f /afs/austin/aix/project/aix41C/cscope/bos.db
#       -P /afs/austin/aix/project/aix41C/build/base

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