[PATCH 4/4] poison input_location and cfun in one spot

[Trevor Saunders <tbsaunde@tbsaunde.org>]

This simply confirms we can poison them in a small region.

boostrapped and regtested on x86_64-linux-gnu, ok?

Trev

gcc/ChangeLog:

	* gimple-range.cc (disable_ranger): Prevent access to cfun and
	input_location.
---
 gcc/gimple-range.cc | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/gcc/gimple-range.cc b/gcc/gimple-range.cc
index 1851339c528..d4a3a6e46be 100644
--- a/gcc/gimple-range.cc
+++ b/gcc/gimple-range.cc
@@ -22,6 +22,7 @@ along with GCC; see the file COPYING3.  If not see
 #include "config.h"
 #include "system.h"
 #include "coretypes.h"
+#include "poison.h"
 #include "backend.h"
 #include "tree.h"
 #include "gimple.h"
@@ -509,6 +510,8 @@ enable_ranger (struct function *fun)
 void
 disable_ranger (struct function *fun)
 {
+  auto_poison<location_t> pil (input_location);
+  auto_poison<function *> pcfun (cfun_poison);
   delete fun->x_range_query;
 
   fun->x_range_query = &global_ranges;
-- 
2.20.1