Introduce event_location_up

This removes make_cleanup_delete_event_location and instead changes
the various location functions to return an event_location_up, a new
unique_ptr typedef.

This is largely straightforward, but be sure to examine the
init_breakpoint_sal change.  I believe the code I deleted there is
dead, because "location != NULL" can never be true in that branch; but
you should double-check.

gdb/ChangeLog
2017-04-12  Tom Tromey  <tom@tromey.com>

	* tracepoint.c (scope_info): Update.
	* spu-tdep.c (spu_catch_start): Update.
	* python/python.c (gdbpy_decode_line): Update.
	* python/py-finishbreakpoint.c (bpfinishpy_init): Update.
	* python/py-breakpoint.c (bppy_init): Update.
	* probe.c (parse_probes): Update.
	* mi/mi-cmd-break.c (mi_cmd_break_insert_1): Update.
	* location.h (event_location_deleter): New struct.
	(event_location_up): New typedef.
	(new_linespec_location, new_address_location, new_probe_location)
	(new_explicit_location, copy_event_location)
	(string_to_event_location, string_to_event_location_basic)
	(string_to_explicit_location): Update return type.
	(make_cleanup_delete_event_location): Remove.
	* location.c (new_linespec_location, new_address_location)
	(new_probe_location, new_explicit_location, copy_event_location):
	Return event_location_up.
	(delete_event_location_cleanup)
	(make_cleanup_delete_event_location): Remove.
	(string_to_explicit_location, string_to_event_location_basic)
	(string_to_event_location): Return event_location_up.
	* linespec.c (canonicalize_linespec, event_location_to_sals)
	(decode_line_with_current_source)
	(decode_line_with_last_displayed, decode_objc): Update.
	* guile/scm-breakpoint.c (gdbscm_register_breakpoint_x): Update.
	* completer.c (location_completer): Update.
	* cli/cli-cmds.c (edit_command, list_command): Update.
	* breakpoint.c (create_overlay_event_breakpoint)
	(create_longjmp_master_breakpoint)
	(create_std_terminate_master_breakpoint)
	(create_exception_master_breakpoint)
	(create_thread_event_breakpoint): Update.
	(init_breakpoint_sal): Update.  Remove some dead code.
	(create_breakpoint_sal): Change type of "location".  Update.
	(create_breakpoints_sal, create_breakpoint, break_command_1)
	(dprintf_command, break_range_command, until_break_command)
	(init_ada_exception_breakpoint)
	(strace_marker_create_sals_from_location)
	(update_static_tracepoint, trace_command, ftrace_command)
	(strace_command, create_tracepoint_from_upload): Update.
	* break-catch-throw.c (re_set_exception_catchpoint): Update.
	* ax-gdb.c (agent_command_1): Update.

1 files changed, 4 insertions, 7 deletions

diff --git a/gdb/tracepoint.c b/gdb/tracepoint.c
index c28aa38..dac1657 100644
--- a/gdb/tracepoint.c
+++ b/gdb/tracepoint.c
@@ -2591,20 +2591,18 @@ scope_info (char *args, int from_tty)
   int j, count = 0;
   struct gdbarch *gdbarch;
   int regno;
-  struct event_location *location;
-  struct cleanup *back_to;
 
   if (args == 0 || *args == 0)
     error (_("requires an argument (function, "
 	     "line or *addr) to define a scope"));
 
-  location = string_to_event_location (&args, current_language);
-  back_to = make_cleanup_delete_event_location (location);
-  sals = decode_line_1 (location, DECODE_LINE_FUNFIRSTLINE, NULL, NULL, 0);
+  event_location_up location = string_to_event_location (&args,
+							 current_language);
+  sals = decode_line_1 (location.get (), DECODE_LINE_FUNFIRSTLINE,
+			NULL, NULL, 0);
   if (sals.nelts == 0)
     {
       /* Presumably decode_line_1 has already warned.  */
-      do_cleanups (back_to);
       return;
     }
 
@@ -2743,7 +2741,6 @@ scope_info (char *args, int from_tty)
   if (count <= 0)
     printf_filtered ("Scope for %s contains no locals or arguments.\n",
 		     save_args);
-  do_cleanups (back_to);
 }
 
 /* Helper for trace_dump_command.  Dump the action list starting at