PR 10690 (partial fix). Handle '.=' operator in procfs probes.

* tapsets.h (var_expanding_visitor): Add 'valid_ops' and 'op' member
  variables.
* tapsets.cxx (var_expanding_visitor::var_expanding_visitor): Set
  'valid_ops' to '='.  By default, var_expanding_visitor classes only
  handle the '=' operator.
  (var_expanding_visitor::visit_assignment): Remember what operator we're
  handling.  When an operator is found that isn't in the 'valid_ops' set,
  error.
* tapset-procfs.cxx
  (procfs_var_expanding_visitor::procfs_var_expanding_visitor): Add '.='
  to the 'valid_ops' set.
  (procfs_var_expanding_visitor::visit_target_symbol): Handle the '.='
  operator when the target variable is an lvalue.

1 files changed, 3 insertions, 1 deletions

diff --git a/tapsets.h b/tapsets.h
index 115f2ccf..d415ef42 100644
--- a/tapsets.h
+++ b/tapsets.h
@@ -49,8 +49,10 @@ struct var_expanding_visitor: public update_visitor
 {
   static unsigned tick;
   std::stack<functioncall**> target_symbol_setter_functioncalls;
+  std::set<std::string> valid_ops;
+  std::string *op;
 
-  var_expanding_visitor() {}
+  var_expanding_visitor ();
   void visit_assignment (assignment* e);
 };