Use the query paradigm for resolving sdt probes

There was a bad assumption in the probe_table initialization that the
dwflpp->module would be immediately valid.  We should not assume that
dwflpp only has one module, or that any module is necessarily in focus.

Instead, I've created an sdt_query class which will call an
iterate_over_modules like the other dwarf probe types.  For now this
means just a single module, but it will also open the door to iterating
over all linked libraries too, for example.

* dwflpp.cxx (dwflpp::setup_user): don't "save mod!" anymore
* tapsets.cxx (probe_table -> sdt_query): convert to a query-style
  class, and also take over the task of iterating over the probes.
  (dwarf_builder::build): leave the iteration to sdt_query

1 files changed, 0 insertions, 2 deletions

diff --git a/dwflpp.cxx b/dwflpp.cxx
index 1951b071..5fec20e2 100644
--- a/dwflpp.cxx
+++ b/dwflpp.cxx
@@ -417,8 +417,6 @@ dwflpp::setup_user(const vector<string>& modules, bool debuginfo_needed)
                                     module_name.c_str(),
                                     module_name.c_str(),
                                     -1);
-      // XXX: save mod!
-      module = mod;
 
       if (debuginfo_needed)
         dwfl_assert (string("missing process ") +