[Bug sanitizer/111736] Address sanitizer is not compatible with named address spaces

[rguenth at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=111736

Richard Biener <rguenth at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|REOPENED                    |ASSIGNED

--- Comment #13 from Richard Biener <rguenth at gcc dot gnu.org> ---
The original testcase is fixed, appearantly slapping 'extern' on the int makes
it not effective.

Possibly better amend the

  if (VAR_P (inner) && DECL_HARD_REGISTER (inner))
    return;

check though.  As indicated my fix fixed only VAR_DECL cases, there's
still pointer-based accesses (MEM_REF) to consider.  So possibly even
the following is necessary

diff --git a/gcc/asan.cc b/gcc/asan.cc
index 0fd7dd1f3ed..36f85757435 100644
--- a/gcc/asan.cc
+++ b/gcc/asan.cc
@@ -2747,7 +2747,8 @@ instrument_derefs (gimple_stmt_iterator *iter, tree t,
       || maybe_ne (bitsize, size_in_bytes * BITS_PER_UNIT))
     return;

-  if (VAR_P (inner) && DECL_HARD_REGISTER (inner))
+  if ((VAR_P (inner) && DECL_HARD_REGISTER (inner))
+      || !ADDR_SPACE_GENERIC_P (TYPE_ADDR_SPACE (TREE_TYPE (inner))))
     return;

   poly_int64 decl_size;