From: Marek Polacek <polacek@redhat.com>
Date: Fri, 25 Sep 2015 09:50:29 +0000 (+0000)
Subject: re PR sanitizer/64906 (-fsanitize=integer-divide-by-zero creates false -Wmaybe-uninit... 
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=15dbc1a6df73343e769a8e310c1ed89829b61613;p=gcc.git

re PR sanitizer/64906 (-fsanitize=integer-divide-by-zero creates false -Wmaybe-uninitialized warning)

	PR sanitizer/64906
	* c-ubsan.c (ubsan_instrument_division): Also pre-evaluate OP1.

	* c-c++-common/ubsan/pr64906.c: New test.

From-SVN: r228112
---

diff --git a/gcc/c-family/ChangeLog b/gcc/c-family/ChangeLog
index e409150ba61..b9feff6e55c 100644
--- a/gcc/c-family/ChangeLog
+++ b/gcc/c-family/ChangeLog
@@ -1,3 +1,8 @@
+2015-09-25  Marek Polacek  <polacek@redhat.com>
+
+	PR sanitizer/64906
+	* c-ubsan.c (ubsan_instrument_division): Also pre-evaluate OP1.
+
 2015-09-24  Patrick Palka  <ppalka@gcc.gnu.org>
 
 	* c-indentation.c (should_warn_for_misleading_indentation):
diff --git a/gcc/c-family/c-ubsan.c b/gcc/c-family/c-ubsan.c
index e0cce8467e4..d2bc264f632 100644
--- a/gcc/c-family/c-ubsan.c
+++ b/gcc/c-family/c-ubsan.c
@@ -104,6 +104,7 @@ ubsan_instrument_division (location_t loc, tree op0, tree op1)
 	}
     }
   t = fold_build2 (COMPOUND_EXPR, TREE_TYPE (t), unshare_expr (op0), t);
+  t = fold_build2 (COMPOUND_EXPR, TREE_TYPE (t), unshare_expr (op1), t);
   if (flag_sanitize_undefined_trap_on_error)
     tt = build_call_expr_loc (loc, builtin_decl_explicit (BUILT_IN_TRAP), 0);
   else
diff --git a/gcc/testsuite/ChangeLog b/gcc/testsuite/ChangeLog
index 193eb8e99b4..cfa23c659b8 100644
--- a/gcc/testsuite/ChangeLog
+++ b/gcc/testsuite/ChangeLog
@@ -1,3 +1,8 @@
+2015-09-25  Marek Polacek  <polacek@redhat.com>
+
+	PR sanitizer/64906
+	* c-c++-common/ubsan/pr64906.c: New test.
+
 2015-09-24  H.J. Lu  <hongjiu.lu@intel.com>
 
 	* gcc.target/i386/pr66749.c (dg-options): Replace -mtune=iamcu
diff --git a/gcc/testsuite/c-c++-common/ubsan/pr64906.c b/gcc/testsuite/c-c++-common/ubsan/pr64906.c
new file mode 100644
index 00000000000..e0ac0eefd5e
--- /dev/null
+++ b/gcc/testsuite/c-c++-common/ubsan/pr64906.c
@@ -0,0 +1,12 @@
+/* PR sanitizer/64906 */
+/* { dg-do compile } */
+/* { dg-options "-fsanitize=integer-divide-by-zero -O -Werror=maybe-uninitialized" } */
+
+int
+fn1 (int f, int s)
+{
+  int ret = 0;
+  if (f)
+    ret = s / (f ? (unsigned long) 8 : 0);
+  return ret;
+}