gdb: on exec, delegate pushing / unpushing target and adding thread to target_ops::follow_exec

On "exec", some targets need to unpush themselves from the inferior,
and do some bookkeeping, like forgetting the data associated to the
exec'ing inferior.

One such example is the thread-db target.  It does so in
a special case in thread_db_target::wait, just before returning the
TARGET_WAITKIND_EXECD event to its caller.

We have another such case in the context of rocm-gdb [1], where the
"rocm" target is pushed on top of the linux-nat target.  When an exec
happens, we want to unpush the rocm target from the exec'ing inferior to
close some file descriptors that refer to the pre-exec address space and
forget about that inferior.  We then want to push the target on the
inferior in which execution continues, to open the file descriptors for
the post-exec address space.

I think that a good way to address this cleanly is to do all this in the
target_ops::follow_exec implementations.  Make the
process_stratum_target::follow_exec implementation have the default
behavior of pushing itself to the new inferior's target stack (if
execution continues in a new inferior) and add the initial thread.

remote_target::follow_exec is an example of process target that wants to
do a bit more than the default behavior.  So it calls
process_stratum_target::follow_exec first and does the extra work
second.

linux-thread-db (a non-process target) implements follow_exec to do some
bookeeping (forget about that process' data), before handing down the
event down to the process target (which hits
process_stratum_target::follow_exec).

gdb/ChangeLog:

	* target.h (struct target_ops) <follow_exec>: Add ptid_t
	parameter.
	(target_follow_exec): Likewise.
	* target.c (target_follow_exec): Add ptid_t parameter.
	* infrun.c (follow_exec): Adjust call to target_follow_exec,
	don't push target nor create thread.
	* linux-thread-db.c (class thread_db_target) <follow_exec>: New.
	(thread_db_target::wait): Just return on TARGET_WAITKIND_EXECD.
	(thread_db_target::follow_exec): New.
	* remote.c (class remote_target) <follow_exec>: Add ptid_t parameter.
	(remote_target::follow_exec): Call
	process_stratum_target::follow_exec.
	* target-delegates.c: Re-generate.

Change-Id: I3f96d0ba3ea0dde6540b7e1b4d5cdb01635088c8

1 files changed, 15 insertions, 10 deletions

diff --git a/gdb/linux-thread-db.c b/gdb/linux-thread-db.c
index 1c6ea4debd8..2c75cd60794 100644
--- a/gdb/linux-thread-db.c
+++ b/gdb/linux-thread-db.c
@@ -95,6 +95,7 @@ public:
   ptid_t wait (ptid_t, struct target_waitstatus *, target_wait_flags) override;
   void resume (ptid_t, int, enum gdb_signal) override;
   void mourn_inferior () override;
+  void follow_exec (inferior *, ptid_t, const char *) override;
   void update_thread_list () override;
   std::string pid_to_str (ptid_t) override;
   CORE_ADDR get_thread_local_address (ptid_t ptid,
@@ -1384,6 +1385,7 @@ thread_db_target::wait (ptid_t ptid, struct target_waitstatus *ourstatus,
     case TARGET_WAITKIND_EXITED:
     case TARGET_WAITKIND_THREAD_EXITED:
     case TARGET_WAITKIND_SIGNALLED:
+    case TARGET_WAITKIND_EXECD:
       return ptid;
     }
 
@@ -1393,16 +1395,6 @@ thread_db_target::wait (ptid_t ptid, struct target_waitstatus *ourstatus,
   if (info == NULL)
     return ptid;
 
-  if (ourstatus->kind == TARGET_WAITKIND_EXECD)
-    {
-      /* New image, it may or may not end up using thread_db.  Assume
-	 not unless we find otherwise.  */
-      delete_thread_db_info (beneath, ptid.pid ());
-      current_inferior ()->unpush_target (this);
-
-      return ptid;
-    }
-
   /* Fill in the thread's user-level thread id and status.  */
   thread_from_lwp (find_thread_ptid (beneath, ptid), ptid);
 
@@ -1423,6 +1415,19 @@ thread_db_target::mourn_inferior ()
   current_inferior ()->unpush_target (this);
 }
 
+void
+thread_db_target::follow_exec (inferior *follow_inf, ptid_t ptid,
+			       const char *execd_pathname)
+{
+  process_stratum_target *beneath
+    = as_process_stratum_target (this->beneath ());
+
+  delete_thread_db_info (beneath, ptid.pid ());
+
+  current_inferior ()->unpush_target (this);
+  beneath->follow_exec (follow_inf, ptid, execd_pathname);
+}
+
 struct callback_data
 {
   struct thread_db_info *info;