[Bug tree-optimization/59149] New: diagnose_tm_1 calls flags_from_decl_or_type on an ADDR_EXPR

["glisse at gcc dot gnu.org" <gcc-bugzilla at gcc dot gnu dot org>]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=59149

            Bug ID: 59149
           Summary: diagnose_tm_1 calls flags_from_decl_or_type on an
                    ADDR_EXPR
           Product: gcc
           Version: 4.9.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: tree-optimization
          Assignee: unassigned at gcc dot gnu.org
          Reporter: glisse at gcc dot gnu.org

(I haven't seen a category for transactional memory)
In trans-mem.c, function diagnose_tm_1 has:

if (flags_from_decl_or_type (fn) & ECF_TM_BUILTIN)

earlier, it tries:

            if (TREE_CODE (fn) == ADDR_EXPR
                && TREE_CODE (TREE_OPERAND (fn, 0)) == FUNCTION_DECL)
              {
                direct_call_p = true;
                replacement = TREE_OPERAND (fn, 0);
                replacement = find_tm_replacement_function (replacement);
                if (replacement)
                  fn = replacement;
              }

which in many cases leaves the ADDR_EXPR in fn.

I believe flags_from_decl_or_type shouldn't be called with anything other than
a decl or a type and we could add an assertion in there. If you disagree, feel
free to close the PR. I noticed this because it broke a local patch of mine
where I added code to flags_from_decl_or_type that didn't like ADDR_EXPR.