Fix PR sanitizer/78270 (part 2)

	PR sanitizer/78270
	* gimplify.c (gimplify_switch_expr): Always save previous
	gimplify_ctxp->live_switch_vars.
	PR sanitizer/78270
	* gcc.dg/asan/pr78270.c: Update comment style.
	* gcc.dg/asan/pr78270-2.c: New test.

From-SVN: r242485

gcc/ChangeLog

+2016-11-16  Martin Liska  <mliska@suse.cz>
+
+	PR sanitizer/78270
+	* gimplify.c (gimplify_switch_expr): Always save previous
+	gimplify_ctxp->live_switch_vars.
+
 2016-11-16  Andrew Burgess  <andrew.burgess@embecosm.com>
 
 	* config/arc/arc.md (movb peephole2): New peephole2 to merge two

gcc/gimplify.c

@@ -2255,11 +2255,11 @@ gimplify_switch_expr (tree *expr_p, gimple_seq *pre_p)
       gimplify_ctxp->case_labels.create (8);
 
       /* Do not create live_switch_vars if SWITCH_BODY is not a BIND_EXPR.  */
+      saved_live_switch_vars = gimplify_ctxp->live_switch_vars;
       if (TREE_CODE (SWITCH_BODY (switch_expr)) == BIND_EXPR)
-	{
-	  saved_live_switch_vars = gimplify_ctxp->live_switch_vars;
-	  gimplify_ctxp->live_switch_vars = new hash_set<tree> (4);
-	}
+	gimplify_ctxp->live_switch_vars = new hash_set<tree> (4);
+      else
+	gimplify_ctxp->live_switch_vars = NULL;
 
       bool old_in_switch_expr = gimplify_ctxp->in_switch_expr;
       gimplify_ctxp->in_switch_expr = true;

gcc/testsuite/ChangeLog

+2016-11-16  Martin Liska  <mliska@suse.cz>
+
+	PR sanitizer/78270
+	* gcc.dg/asan/pr78270.c: Update comment style.
+	* gcc.dg/asan/pr78270-2.c: New test.
+
 2016-11-16  Senthil Kumar Selvaraj  <senthil_kumar.selvaraj@atmel.com>
 
 	* c-c++-common/Wlogical-op-1.c: Use __INT{16,32}_TYPE__ instead

gcc/testsuite/gcc.dg/asan/pr78270-2.c

+/* PR sanitizer/78270 */
+/* { dg-do compile } */
+/* { dg-additional-options "-Wno-switch-unreachable" } */
+
+int a;
+void
+fn1 ()
+{
+  switch (a)
+    {
+      char b;
+    case 8:
+      &b;
+      switch (0)
+	;
+    }
+}
+

gcc/testsuite/gcc.dg/asan/pr78270.c

-// { dg-do compile }
-// { dg-additional-options "-Wno-switch-unreachable" }
+/* PR sanitizer/78270 */
+/* { dg-do compile } */
+/* { dg-additional-options "-Wno-switch-unreachable" } */
 
 typedef struct
 {