analyzer: refactor custom_event, introducing precanned_custom_event class

I have followup work where a custom event's description would be better
handled via a vfunc rather that a precanned string, hence this
refactoring to make it easy to add custom_event subclasses.

gcc/analyzer/ChangeLog:
	* checker-path.cc (class custom_event): Make abstract to allow for
	custom vfuncs, splitting existing implementation into...
	(class precanned_custom_event): New subclass.
	(custom_event::get_desc): Move to...
	(precanned_custom_event::get_desc): ...subclass.
	* checker-path.h (class custom_event): Make abstract to allow for
	custom vfuncs, splitting existing implementation into...
	(class precanned_custom_event): New subclass.
	* diagnostic-manager.cc (diagnostic_manager::add_events_for_eedge):
	Use precanned_custom_event.
	* engine.cc
	(stale_jmp_buf::maybe_add_custom_events_for_superedge): Likewise.
	* sm-signal.cc (signal_delivery_edge_info_t::add_events_to_path):
	Likewise.

Signed-off-by: David Malcolm <dmalcolm@redhat.com>

1 files changed, 4 insertions, 3 deletions

diff --git a/gcc/analyzer/sm-signal.cc b/gcc/analyzer/sm-signal.cc
index d7e7e7c..42be809 100644
--- a/gcc/analyzer/sm-signal.cc
+++ b/gcc/analyzer/sm-signal.cc
@@ -238,9 +238,10 @@ public:
     FINAL OVERRIDE
   {
     emission_path->add_event
-      (new custom_event (UNKNOWN_LOCATION, NULL_TREE, 0,
-			 "later on,"
-			 " when the signal is delivered to the process"));
+      (new precanned_custom_event
+       (UNKNOWN_LOCATION, NULL_TREE, 0,
+	"later on,"
+	" when the signal is delivered to the process"));
   }
 };