re PR sanitizer/81111 (Cannot build libstdc++ with -fsanitize=undefined)

	PR sanitizer/81111
	* ubsan.c (ubsan_encode_value): If current_function_decl is NULL,
	use create_tmp_var_raw instead of create_tmp_var, mark it addressable
	just by setting TREE_ADDRESSABLE on the result and use a TARGET_EXPR.

	* g++.dg/ubsan/pr81111.C: New test.

From-SVN: r249375

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index 64fa3893090036bee15ad085d1e2a105a96c75b0..c165b7f517f5c9e60e12126f2c6a607ceda2e2c9 100644 (file)
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,10 @@
+2017-06-19  Jakub Jelinek  <jakub@redhat.com>
+
+       PR sanitizer/81111
+       * ubsan.c (ubsan_encode_value): If current_function_decl is NULL,
+       use create_tmp_var_raw instead of create_tmp_var, mark it addressable
+       just by setting TREE_ADDRESSABLE on the result and use a TARGET_EXPR.
+
 2017-06-19  Richard Biener  <rguenther@suse.de>
 
        PR middle-end/81118

diff --git a/gcc/testsuite/ChangeLog b/gcc/testsuite/ChangeLog
index a27eac2395e291f38fe99d80f426d6bb91888b2d..b38e45edb8a87b24a89cdd2a409ae0f670d16631 100644 (file)
--- a/gcc/testsuite/ChangeLog
+++ b/gcc/testsuite/ChangeLog
@@ -1,3 +1,8 @@
+2017-06-19  Jakub Jelinek  <jakub@redhat.com>
+
+       PR sanitizer/81111
+       * g++.dg/ubsan/pr81111.C: New test.
+
 2017-06-19  Richard Biener  <rguenther@suse.de>
 
        PR middle-end/81118

diff --git a/gcc/testsuite/g++.dg/ubsan/pr81111.C b/gcc/testsuite/g++.dg/ubsan/pr81111.C
new file mode 100644 (file)
index 0000000..6d54a2f
--- /dev/null
+++ b/gcc/testsuite/g++.dg/ubsan/pr81111.C
@@ -0,0 +1,45 @@
+// PR sanitizer/81111
+// { dg-do compile }
+// { dg-options "-fsanitize=shift" }
+
+template <typename V>
+struct N
+{
+  static const V m = (((V)(-1) < 0)
+                     ? (V)1 << (sizeof(V) * __CHAR_BIT__ - ((V)(-1) < 0))
+                     : (V) 0);
+};
+
+template<typename V>
+const V N<V>::m;
+
+template <typename V>
+struct O
+{
+  static const V m = (V)1 << sizeof(V) * __CHAR_BIT__;
+};
+
+template<typename V>
+const V O<V>::m;
+
+void
+foo ()
+{
+  N<long long>::m;
+  N<unsigned long long>::m;
+#ifdef __SIZEOF_INT128__
+  N<__int128>::m;
+  N<unsigned __int128>::m;
+#endif
+}
+
+void
+bar ()
+{
+  O<long long>::m;
+  O<unsigned long long>::m;
+#ifdef __SIZEOF_INT128__
+  O<__int128>::m;
+  O<unsigned __int128>::m;
+#endif
+}

diff --git a/gcc/ubsan.c b/gcc/ubsan.c
index 52ba5b586bda1130889ee874c1eb539a143ef540..855b2ea0e79f36ed1b87652eaeeabeb4ab78d7bd 100644 (file)
--- a/gcc/ubsan.c
+++ b/gcc/ubsan.c
@@ -143,9 +143,17 @@ ubsan_encode_value (tree t, bool in_expand_p)
        {
          /* The reason for this is that we don't want to pessimize
             code by making vars unnecessarily addressable.  */
-         tree var = create_tmp_var (type);
-         tree tem = build2 (MODIFY_EXPR, void_type_node, var, t);
-         mark_addressable (var);
+         tree var;
+         if (current_function_decl)
+           {
+             var = create_tmp_var (type);
+             mark_addressable (var);
+           }
+         else
+           {
+             var = create_tmp_var_raw (type);
+             TREE_ADDRESSABLE (var) = 1;
+           }
          if (in_expand_p)
            {
              rtx mem
@@ -156,8 +164,17 @@ ubsan_encode_value (tree t, bool in_expand_p)
              expand_assignment (var, t, false);
              return build_fold_addr_expr (var);
            }
-         t = build_fold_addr_expr (var);
-         return build2 (COMPOUND_EXPR, TREE_TYPE (t), tem, t);
+         if (current_function_decl)
+           {
+             tree tem = build2 (MODIFY_EXPR, void_type_node, var, t);
+             t = build_fold_addr_expr (var);
+             return build2 (COMPOUND_EXPR, TREE_TYPE (t), tem, t);
+           }
+         else
+           {
+             var = build4 (TARGET_EXPR, type, var, t, NULL_TREE, NULL_TREE);
+             return build_fold_addr_expr (var);
+           }
        }
       else
        return build_fold_addr_expr (t);