Remove save_inferior_ptid

This removes save_inferior_ptid, a cleanup function, in favor of
scoped_restore.

This also fixes a possible (it seems unlikely that it could happen in
practice) memory leak -- save_inferior_ptid should have used
make_cleanup_dtor, because it allocated memory.

I tested this on the buildbot.  However, there are two caveats to
this.  First, sometimes it seems I misread the results.  Second, I
think this patch touches some platforms that can't be tested by the
buildbot.  So, extra care seems warranted.

ChangeLog
2017-08-18  Tom Tromey  <tom@tromey.com>
	    Pedro Alves  <palves@redhat.com>

	* spu-multiarch.c (parse_spufs_run): Use scoped_restore.
	* sol-thread.c (sol_thread_resume, sol_thread_wait)
	(sol_thread_xfer_partial, rw_common): Use scoped_restore.
	* procfs.c (procfs_do_thread_registers): Use scoped_restore.
	* proc-service.c (ps_xfer_memory): Use scoped_restore.
	* linux-tdep.c (linux_corefile_thread): Remove a cleanup.
	(linux_get_siginfo_data): Add "thread" argument.  Use
	scoped_restore.
	* linux-nat.c (linux_child_follow_fork)
	(check_stopped_by_watchpoint): Use scoped_restore.
	* infrun.c (displaced_step_prepare_throw, write_memory_ptid)
	(THREAD_STOPPED_BY, handle_signal_stop): Use scoped_restore.
	(restore_inferior_ptid, save_inferior_ptid): Remove.
	* btrace.c (btrace_fetch): Use scoped_restore.
	* bsd-uthread.c (bsd_uthread_fetch_registers)
	(bsd_uthread_store_registers): Use scoped_restore.
	* breakpoint.c (reattach_breakpoints, detach_breakpoints): Use
	scoped_restore.
	* aix-thread.c (aix_thread_resume, aix_thread_wait)
	(aix_thread_xfer_partial): Use scoped_restore.
	* inferior.h (save_inferior_ptid): Remove.

1 files changed, 1 insertions, 4 deletions

diff --git a/gdb/procfs.c b/gdb/procfs.c
index 4b965ea..504d74c 100644
--- a/gdb/procfs.c
+++ b/gdb/procfs.c
@@ -5316,7 +5316,6 @@ procfs_do_thread_registers (bfd *obfd, ptid_t ptid,
   gdb_gregset_t gregs;
   gdb_fpregset_t fpregs;
   unsigned long merged_pid;
-  struct cleanup *old_chain;
 
   merged_pid = ptid_get_lwp (ptid) << 16 | ptid_get_pid (ptid);
 
@@ -5325,7 +5324,7 @@ procfs_do_thread_registers (bfd *obfd, ptid_t ptid,
      once it is implemented in this platform:
      gdbarch_iterate_over_regset_sections().  */
 
-  old_chain = save_inferior_ptid ();
+  scoped_restore save_inferior_ptid = make_scoped_restore (&inferior_ptid);
   inferior_ptid = ptid;
   target_fetch_registers (regcache, -1);
 
@@ -5352,8 +5351,6 @@ procfs_do_thread_registers (bfd *obfd, ptid_t ptid,
 					      &fpregs,
 					      sizeof (fpregs));
 
-  do_cleanups (old_chain);
-
   return note_data;
 }