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environment for 'shell' command
- From: Jason Kraftcheck <kraftche at cae dot wisc dot edu>
- To: gdb at sources dot redhat dot com
- Date: Wed, 17 Jul 2002 11:48:30 -0500
- Subject: environment for 'shell' command
- Organization: University of Wisconsin (http://www.wisc.edu)
- Reply-to: kraftche at cae dot wisc dot edu
Hi,
I would like the ability to pass the file name and line number of the
source corresponding to the selected stack frame to a program started
via the 'shell' command. I could not find any way to do this in gdb.
If there is a way to do this, please let me know (and disregard the rest
of this message.) I decided to add this functionality but I am
unfimiliar with the internal workings of gdb. The following is a
description of what I did to implement this. I'd really appreciate any
suggestions on better ways to implement this, error conditions I'm not
handling, etc.
The simplest way I could come up with to do this is to put the values in
environmental variables immediately before executing the command.
Specifically, setting gdb_stack_dir, gdb_stack_file, and gdb_stack_line
to the values from a struct symtab_and_line. I use this for defining
things like a 'view' command that highlights the current location in the
source in a text editor:
define view
shell if [ x$gdb_stack_file != x ]; then \
nc -line $gdb_stack_line $gdb_stack_dir$gdb_stack_file; \
fi
end
I added the following function to stack.c to get a symtab_and_line
struct for the selected frame:
/* Get a symtab_and_line for the selected stack frame. */
struct symtab_and_line
find_selected_line (void)
{
struct symtab_and_line sal;
INIT_SAL( &sal );
if( selected_frame != NULL )
sal = find_pc_line(selected_frame->pc,
selected_frame->next
&& !selected_frame->next->signal_handler_caller
&& !frame_in_dummy (selected_frame->next));
return sal;
}
I added a function 'set_shell_environment' to cli/cli-cmds.c and added
calls to that function in 'shell_escape'.
#define SHELL_ENV "gdb_stack_"
static void
set_shell_environment()
{
char buffer[16];
struct symtab_and_line sal = find_selected_line();
unsetenv (SHELL_ENV "file");
unsetenv (SHELL_ENV "dir");
unsetenv (SHELL_ENV "line");
if (sal.symtab && sal.symtab->filename && sal.symtab->dirname)
{
sprintf (buffer, "%d", sal.line);
setenv (SHELL_ENV "line", buffer, 1);
setenv (SHLLL_ENV "dir", sal.symtab->dirname, 1);
setenv (SHELL_ENV "file", sal.symtab->filename, 1);
}
}
thanks,
--
Jason Kraftcheck