re PR sanitizer/59306 (ICE with -fsanitize=null: gimple check: expected…

re PR sanitizer/59306 (ICE with -fsanitize=null: gimple check: expected gimple_call(error_mark), have gimple_assign(addr_expr) in gimple_call_arg)

	PR sanitizer/59306
	* ubsan.c (instrument_null): Use gimple_store_p/gimple_assign_load_p
	instead of walk_gimple_op.
	(ubsan_pass): Adjust.  Call instrument_null only if SANITIZE_NULL.
testsuite/
	* g++.dg/ubsan/pr59306.C: New test.

From-SVN: r205443

gcc/ChangeLog

+2013-11-27  Marek Polacek  <polacek@redhat.com>
+
+	PR sanitizer/59306
+	* ubsan.c (instrument_null): Use gimple_store_p/gimple_assign_load_p
+	instead of walk_gimple_op.
+	(ubsan_pass): Adjust.  Call instrument_null only if SANITIZE_NULL.
+
 2013-11-27  Aldy Hernandez  <aldyh@redhat.com>
 	    Jakub Jelinek  <jakub@redhat.com>
 

gcc/testsuite/ChangeLog

+2013-11-27  Marek Polacek  <polacek@redhat.com>
+
+	PR sanitizer/59306
+	* g++.dg/ubsan/pr59306.C: New test.
+
 2013-11-27  Aldy Hernandez  <aldyh@redhat.com>
 	    Jakub Jelinek  <jakub@redhat.com>
 

gcc/testsuite/g++.dg/ubsan/pr59306.C

+// { dg-do compile }
+// { dg-options "-fsanitize=undefined" }
+// { dg-skip-if "" { *-*-* } { "-flto" } { "" } }
+
+class A {
+  void bar (void (A::*) (int));
+  void foo (int);
+  void B ();
+};
+
+void A::B()
+{
+  bar (&A::foo);
+}

gcc/ubsan.c

@@ -614,24 +614,22 @@ instrument_mem_ref (tree t, gimple_stmt_iterator *iter, bool is_lhs)
   gsi_insert_before (iter, g, GSI_SAME_STMT);
 }
 
-/* Callback function for the pointer instrumentation.  */
+/* Perform the pointer instrumentation.  */
 
-static tree
-instrument_null (tree *tp, int * /*walk_subtree*/, void *data)
+static void
+instrument_null (gimple_stmt_iterator gsi, bool is_lhs)
 {
-  tree t = *tp;
+  gimple stmt = gsi_stmt (gsi);
+  tree t = is_lhs ? gimple_get_lhs (stmt) : gimple_assign_rhs1 (stmt);
+  t = get_base_address (t);
   const enum tree_code code = TREE_CODE (t);
-  struct walk_stmt_info *wi = (struct walk_stmt_info *) data;
-
   if (code == MEM_REF
       && TREE_CODE (TREE_OPERAND (t, 0)) == SSA_NAME)
-    instrument_mem_ref (TREE_OPERAND (t, 0), &wi->gsi, wi->is_lhs);
+    instrument_mem_ref (TREE_OPERAND (t, 0), &gsi, is_lhs);
   else if (code == ADDR_EXPR
 	   && POINTER_TYPE_P (TREE_TYPE (t))
 	   && TREE_CODE (TREE_TYPE (TREE_TYPE (t))) == METHOD_TYPE)
-    instrument_member_call (&wi->gsi);
-
-  return NULL_TREE;
+    instrument_member_call (&gsi);
 }
 
 /* Gate and execute functions for ubsan pass.  */
@@ -646,7 +644,6 @@ ubsan_pass (void)
     {
       for (gsi = gsi_start_bb (bb); !gsi_end_p (gsi);)
 	{
-	  struct walk_stmt_info wi;
 	  gimple stmt = gsi_stmt (gsi);
 	  if (is_gimple_debug (stmt) || gimple_clobber_p (stmt))
 	    {
@@ -654,9 +651,14 @@ ubsan_pass (void)
 	      continue;
 	    }
 
-	  memset (&wi, 0, sizeof (wi));
-	  wi.gsi = gsi;
-	  walk_gimple_op (stmt, instrument_null, &wi);
+	  if (flag_sanitize & SANITIZE_NULL)
+	    {
+	      if (gimple_store_p (stmt))
+		instrument_null (gsi, true);
+	      if (gimple_assign_load_p (stmt))
+		instrument_null (gsi, false);
+	    }
+
 	  gsi_next (&gsi);
 	}
     }