* Finding absolute path from relative.
@ 2003-09-29 2:25 Bob Rossi
2003-09-29 2:31 ` Daniel Jacobowitz
0 siblings, 1 reply; 6+ messages in thread
From: Bob Rossi @ 2003-09-29 2:25 UTC (permalink / raw)
To: gdb
Hi,
I am thinking about the algorithm required to find the absolute path to
a source file given the relative path and the output from 'show dir'.
Is it really as easy as this,
for I in 'show dir' # for each directory in show dir
if $I/relative_path exists
break; # Found absolute path.
Or does it get more complex and obfuscated?
Bob Rossi
^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: Finding absolute path from relative.
2003-09-29 2:25 Finding absolute path from relative Bob Rossi
@ 2003-09-29 2:31 ` Daniel Jacobowitz
2003-09-29 2:33 ` Bob Rossi
0 siblings, 1 reply; 6+ messages in thread
From: Daniel Jacobowitz @ 2003-09-29 2:31 UTC (permalink / raw)
To: gdb
On Sun, Sep 28, 2003 at 10:21:28PM -0400, Bob Rossi wrote:
> Hi,
>
> I am thinking about the algorithm required to find the absolute path to
> a source file given the relative path and the output from 'show dir'.
>
> Is it really as easy as this,
>
> for I in 'show dir' # for each directory in show dir
> if $I/relative_path exists
> break; # Found absolute path.
>
> Or does it get more complex and obfuscated?
Well, often the input file has a specified directory. That gets tried
first.
Anyway, there's a good comment or two about this in the source code...
--
Daniel Jacobowitz
MontaVista Software Debian GNU/Linux Developer
^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: Finding absolute path from relative.
2003-09-29 2:31 ` Daniel Jacobowitz
@ 2003-09-29 2:33 ` Bob Rossi
2003-09-29 2:44 ` Daniel Jacobowitz
0 siblings, 1 reply; 6+ messages in thread
From: Bob Rossi @ 2003-09-29 2:33 UTC (permalink / raw)
To: gdb
On Sun, Sep 28, 2003 at 10:25:38PM -0400, Daniel Jacobowitz wrote:
> On Sun, Sep 28, 2003 at 10:21:28PM -0400, Bob Rossi wrote:
> > Hi,
> >
> > I am thinking about the algorithm required to find the absolute path to
> > a source file given the relative path and the output from 'show dir'.
> >
> > Is it really as easy as this,
> >
> > for I in 'show dir' # for each directory in show dir
> > if $I/relative_path exists
> > break; # Found absolute path.
> >
> > Or does it get more complex and obfuscated?
>
> Well, often the input file has a specified directory. That gets tried
> first.
>
> Anyway, there's a good comment or two about this in the source code...
Could you get me started in the right direction? ( ex. files of interest )
Either, I could write an MI command that would take a relative source
path and convert it into an absolute path, or I could write a function
in my front end that does the work.
I personally think an MI command could eventually be more helpful to
everyone.
Bob Rossi
^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: Finding absolute path from relative.
2003-09-29 2:33 ` Bob Rossi
@ 2003-09-29 2:44 ` Daniel Jacobowitz
2003-09-29 4:58 ` Bob Rossi
0 siblings, 1 reply; 6+ messages in thread
From: Daniel Jacobowitz @ 2003-09-29 2:44 UTC (permalink / raw)
To: gdb
On Sun, Sep 28, 2003 at 10:31:11PM -0400, Bob Rossi wrote:
> On Sun, Sep 28, 2003 at 10:25:38PM -0400, Daniel Jacobowitz wrote:
> > On Sun, Sep 28, 2003 at 10:21:28PM -0400, Bob Rossi wrote:
> > > Hi,
> > >
> > > I am thinking about the algorithm required to find the absolute path to
> > > a source file given the relative path and the output from 'show dir'.
> > >
> > > Is it really as easy as this,
> > >
> > > for I in 'show dir' # for each directory in show dir
> > > if $I/relative_path exists
> > > break; # Found absolute path.
> > >
> > > Or does it get more complex and obfuscated?
> >
> > Well, often the input file has a specified directory. That gets tried
> > first.
> >
> > Anyway, there's a good comment or two about this in the source code...
>
> Could you get me started in the right direction? ( ex. files of interest )
>
> Either, I could write an MI command that would take a relative source
> path and convert it into an absolute path, or I could write a function
> in my front end that does the work.
>
> I personally think an MI command could eventually be more helpful to
> everyone.
source.c:openp. Then, open_source_file.
--
Daniel Jacobowitz
MontaVista Software Debian GNU/Linux Developer
^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: Finding absolute path from relative.
2003-09-29 2:44 ` Daniel Jacobowitz
@ 2003-09-29 4:58 ` Bob Rossi
2003-09-29 5:18 ` Eli Zaretskii
0 siblings, 1 reply; 6+ messages in thread
From: Bob Rossi @ 2003-09-29 4:58 UTC (permalink / raw)
To: gdb
On Sun, Sep 28, 2003 at 10:33:46PM -0400, Daniel Jacobowitz wrote:
> On Sun, Sep 28, 2003 at 10:31:11PM -0400, Bob Rossi wrote:
> > On Sun, Sep 28, 2003 at 10:25:38PM -0400, Daniel Jacobowitz wrote:
> > > On Sun, Sep 28, 2003 at 10:21:28PM -0400, Bob Rossi wrote:
> > > > Hi,
> > > >
> > > > I am thinking about the algorithm required to find the absolute path to
> > > > a source file given the relative path and the output from 'show dir'.
> > > >
> > > > Is it really as easy as this,
> > > >
> > > > for I in 'show dir' # for each directory in show dir
> > > > if $I/relative_path exists
> > > > break; # Found absolute path.
> > > >
> > > > Or does it get more complex and obfuscated?
> > >
> > > Well, often the input file has a specified directory. That gets tried
> > > first.
> > >
> > > Anyway, there's a good comment or two about this in the source code...
> >
> > Could you get me started in the right direction? ( ex. files of interest )
> >
> > Either, I could write an MI command that would take a relative source
> > path and convert it into an absolute path, or I could write a function
> > in my front end that does the work.
> >
> > I personally think an MI command could eventually be more helpful to
> > everyone.
>
> source.c:openp. Then, open_source_file.
Thanks!
Another quick question. I have been told that some of the debug formats
support absolute paths and some do not. Does this just mean that some
of the debug formats will give you the absolute path, and with the
others, this expensive lookup is necessary?
I guess the question is, in both cases, can GDB find the absolute path
to a source file, given only the relative path?
Bob Rossi
^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: Finding absolute path from relative.
2003-09-29 4:58 ` Bob Rossi
@ 2003-09-29 5:18 ` Eli Zaretskii
0 siblings, 0 replies; 6+ messages in thread
From: Eli Zaretskii @ 2003-09-29 5:18 UTC (permalink / raw)
To: Bob Rossi; +Cc: gdb
> Date: Sun, 28 Sep 2003 22:44:37 -0400
> From: Bob Rossi <bob@brasko.net>
>
> Another quick question. I have been told that some of the debug formats
> support absolute paths and some do not.
True. COFF is one example of debug info format that stores only the
file name, without the leading directories.
However, even with more advanced debug formats, such as DWARF2, the
file name stored in the debug info might exclude the leading
directories, depending on how the source file was specified to the
compiler during compilation. E.g., try
gcc -c foo.c
vs
gcc -c /full/path/to/foo.c
and then use objdump to look at the file name recorded in foo.o's
debug info.
> Does this just mean that some
> of the debug formats will give you the absolute path, and with the
> others, this expensive lookup is necessary?
>
> I guess the question is, in both cases, can GDB find the absolute path
> to a source file, given only the relative path?
I'm not sure this problem is solvable at all, in all cases. If the
leading directories are not recorded in the debug info, the assumption
that the file is somewhere along the list of known source directories
might not always hold, as GDB has no way of setting the list of those
directories automatically.
^ permalink raw reply [flat|nested] 6+ messages in thread
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2003-09-29 2:25 Finding absolute path from relative Bob Rossi
2003-09-29 2:31 ` Daniel Jacobowitz
2003-09-29 2:33 ` Bob Rossi
2003-09-29 2:44 ` Daniel Jacobowitz
2003-09-29 4:58 ` Bob Rossi
2003-09-29 5:18 ` Eli Zaretskii
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