re PR middle-end/65984 (ICE: definition in block 4 does not dominate use in…

re PR middle-end/65984 (ICE: definition in block 4 does not dominate use in block 2 with -fnon-call-exceptions -fsanitize=enum)

	PR tree-optimization/65984
	* ubsan.c: Include tree-cfg.h.
	(instrument_bool_enum_load): Use stmt_ends_bb_p instead of
	stmt_could_throw_p test, rename can_throw variable to ends_bb.

	* c-c++-common/ubsan/pr65984.c: New test.

From-SVN: r222775

gcc/ChangeLog

+2015-05-04  Jakub Jelinek  <jakub@redhat.com>
+
+	PR tree-optimization/65984
+	* ubsan.c: Include tree-cfg.h.
+	(instrument_bool_enum_load): Use stmt_ends_bb_p instead of
+	stmt_could_throw_p test, rename can_throw variable to ends_bb.
+
 2015-05-04  Uros Bizjak  <ubizjak@gmail.com>
 
 	* config/i386/i386.c: Change GET_CODE (...) == CONST_DOUBLE check

gcc/testsuite/ChangeLog

+2015-05-04  Jakub Jelinek  <jakub@redhat.com>
+
+	PR tree-optimization/65984
+	* c-c++-common/ubsan/pr65984.c: New test.
+
 2015-05-04  Jeff Law  <law@redhat.com>
 
 	* gcc.dg/tree-ssa/shorten-1.c: New test.

gcc/testsuite/c-c++-common/ubsan/pr65984.c

+/* PR tree-optimization/65984 */
+/* { dg-do compile } */
+/* { dg-options "-fnon-call-exceptions -fsanitize=bool,enum" } */
+
+#ifndef __cplusplus
+#define bool _Bool
+#endif
+
+enum E { E0, E1, E2 };
+enum E e[2];
+bool *b;
+
+int
+foo (int i)
+{
+  return e[i];
+}
+
+int
+bar (int i)
+{
+  return b[i];
+}

gcc/ubsan.c

@@ -87,6 +87,7 @@ along with GCC; see the file COPYING3.  If not see
 #include "builtins.h"
 #include "tree-object-size.h"
 #include "tree-eh.h"
+#include "tree-cfg.h"
 
 /* Map from a tree to a VAR_DECL tree.  */
 
@@ -1420,7 +1421,7 @@ instrument_bool_enum_load (gimple_stmt_iterator *gsi)
       || TREE_CODE (gimple_assign_lhs (stmt)) != SSA_NAME)
     return;
 
-  bool can_throw = stmt_could_throw_p (stmt);
+  bool ends_bb = stmt_ends_bb_p (stmt);
   location_t loc = gimple_location (stmt);
   tree lhs = gimple_assign_lhs (stmt);
   tree ptype = build_pointer_type (TREE_TYPE (rhs));
@@ -1432,7 +1433,7 @@ instrument_bool_enum_load (gimple_stmt_iterator *gsi)
   tree mem = build2 (MEM_REF, utype, gimple_assign_lhs (g),
 		     build_int_cst (atype, 0));
   tree urhs = make_ssa_name (utype);
-  if (can_throw)
+  if (ends_bb)
     {
       gimple_assign_set_lhs (stmt, urhs);
       g = gimple_build_assign (lhs, NOP_EXPR, urhs);
@@ -1469,7 +1470,7 @@ instrument_bool_enum_load (gimple_stmt_iterator *gsi)
   gimple_set_location (g, loc);
   gsi_insert_after (gsi, g, GSI_NEW_STMT);
 
-  if (!can_throw)
+  if (!ends_bb)
     {
       gimple_assign_set_rhs_with_ops (&gsi2, NOP_EXPR, urhs);
       update_stmt (stmt);