gdb: add inferior_execd observable

I want to add another action (clearing displaced stepping state) that
happens when an inferior execs.  I think it would be cleaner to have an
observer for this event, rather than have infrun know about each other
sub-component.

Replace the calls to solib_create_inferior_hook and
jit_inferior_created_hook in follow_exec by observers.

gdb/ChangeLog:

	* observable.h (inferior_execd): Declare new observable.
	* observable.c (inferior_execd): Declare new observable.
	* infrun.c (follow_exec): Notify inferior_execd observer.
	* jit.c (jit_inferior_created_hook): Make static.
	(_initialize_jit): Register inferior_execd observer.
	* jit.h (jit_inferior_created_hook): Remove declaration.
	* solib.c (_initialize_solib): Register inferior_execd observer.

Change-Id: I000cce00094e23baa67df693d912646b6ae38e44

1 files changed, 7 insertions, 2 deletions

diff --git a/gdb/jit.c b/gdb/jit.c
index fd24d53..9deeed7 100644
--- a/gdb/jit.c
+++ b/gdb/jit.c
@@ -49,6 +49,7 @@ static const char jit_break_name[] = "__jit_debug_register_code";
 
 static const char jit_descriptor_name[] = "__jit_debug_descriptor";
 
+static void jit_inferior_created_hook (inferior *inf);
 static void jit_inferior_exit_hook (struct inferior *inf);
 
 /* An unwinder is registered for every gdbarch.  This key is used to
@@ -1230,9 +1231,12 @@ jit_inferior_init (inferior *inf)
     }
 }
 
-/* See jit.h.  */
+/* Looks for the descriptor and registration symbols and breakpoints
+   the registration function.  If it finds both, it registers all the
+   already JITed code.  If it has already found the symbols, then it
+   doesn't try again.  */
 
-void
+static void
 jit_inferior_created_hook (inferior *inf)
 {
   jit_inferior_init (inf);
@@ -1337,6 +1341,7 @@ _initialize_jit ()
 			     &setdebuglist, &showdebuglist);
 
   gdb::observers::inferior_created.attach (jit_inferior_created_hook);
+  gdb::observers::inferior_execd.attach (jit_inferior_created_hook);
   gdb::observers::inferior_exit.attach (jit_inferior_exit_hook);
   gdb::observers::breakpoint_deleted.attach (jit_breakpoint_deleted);