+2012-12-10 Jakub Jelinek <jakub@redhat.com>
+
+ * asan.c (instrument_derefs): Handle bitfield COMPONENT_REFs
+ accesses as reads/writes to their DECL_BIT_FIELD_REPRESENTATIVE.
+
2012-12-08 Eric Botcazou <ebotcazou@adacore.com>
* lto-streamer-out.c (lto_write_tree): Do not reset the DECL_INITIAL of
|| (unsigned HOST_WIDE_INT) size_in_bytes - 1 >= 16)
return;
- /* For now just avoid instrumenting bit field acceses.
- Fixing it is doable, but expected to be messy. */
-
HOST_WIDE_INT bitsize, bitpos;
tree offset;
enum machine_mode mode;
&mode, &unsignedp, &volatilep, false);
if (bitpos % (size_in_bytes * BITS_PER_UNIT)
|| bitsize != size_in_bytes * BITS_PER_UNIT)
- return;
+ {
+ if (TREE_CODE (t) == COMPONENT_REF
+ && DECL_BIT_FIELD_REPRESENTATIVE (TREE_OPERAND (t, 1)) != NULL_TREE)
+ {
+ tree repr = DECL_BIT_FIELD_REPRESENTATIVE (TREE_OPERAND (t, 1));
+ instrument_derefs (iter, build3 (COMPONENT_REF, TREE_TYPE (repr),
+ TREE_OPERAND (t, 0), repr,
+ NULL_TREE), location, is_store);
+ }
+ return;
+ }
base = build_fold_addr_expr (t);
build_check_stmt (location, base, iter, /*before_p=*/true,