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gdb: remove final user of the executable_changed observer

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This commit continues with the task started in the previous commit,
and is similar in many ways.

The goal of the next couple of commits is to expose the
executable_changed observable in the Python API as an event.  Before I
do this I would like to remove the additional call to the
executable_changed observable which can be found in the reread_symbols
function in the symfile.c file, as I don't believe that this use
actually corresponds to a change in the current executable.

The previous commit removed one user of the executable_changed
observable and replaced it with a new_obfile observer instead, and
this commit does the same thing.

In auxv.c we use the executable_changed observable to call
invalidate_auxv_cache, which then calls:

  invalidate_auxv_cache_inf (current_inferior ());

The auxv cache is already (additionally) cleared when an inferior
exits and when an inferior appears.

As with the previous commit, I think we can safely replace the use of
the executable_changed observable with a use of the new_obfile
observable.  All the tests still pass, and with some locally placed
printf calls, I think that the cache is still being cleared in all the
cases that should matter.

Approved-By: Tom Tromey <tom@tromey.com>
This commit is contained in:
Andrew Burgess 2023-09-08 15:48:16 +01:00
parent a0a031bce0
commit a2827364e2
1 changed files with 6 additions and 4 deletions
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10
gdb/auxv.c
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@ -344,12 +344,14 @@ invalidate_auxv_cache_inf (struct inferior *inf)
auxv_inferior_data.clear (inf);
}
/* Invalidate current inferior's auxv cache. */
/* Invalidate current inferior's auxv cache when all symbol table data is
cleared (indicated by OBJFILE being nullptr). */
static void
invalidate_auxv_cache (void)
auxv_new_objfile_observer (struct objfile *objfile)
{
invalidate_auxv_cache_inf (current_inferior ());
if (objfile == nullptr)
invalidate_auxv_cache_inf (current_inferior ());
}
/* See auxv.h. */
@ -613,5 +615,5 @@ This is information provided by the operating system at program startup."));
/* Observers used to invalidate the auxv cache when needed. */
gdb::observers::inferior_exit.attach (invalidate_auxv_cache_inf, "auxv");
gdb::observers::inferior_appeared.attach (invalidate_auxv_cache_inf, "auxv");
gdb::observers::executable_changed.attach (invalidate_auxv_cache, "auxv");
gdb::observers::new_objfile.attach (auxv_new_objfile_observer, "auxv");
}