[Bug translator/13241] New: too much dump-unwindsyms processing for modules even if !need_symbols

["fche at redhat dot com" <sourceware-bugzilla at sourceware dot org>]

http://sourceware.org/bugzilla/show_bug.cgi?id=13241

             Bug #: 13241
           Summary: too much dump-unwindsyms processing for modules even
                    if !need_symbols
           Product: systemtap
           Version: unspecified
            Status: NEW
          Severity: normal
          Priority: P2
         Component: translator
        AssignedTo: systemtap@sourceware.org
        ReportedBy: fche@redhat.com
    Classification: Unclassified


For a script of the form

   probe module("*").function("*") {}

The pragma:symbol logic introduced in commit 8af41ec does not assist
in reducing translate.cxx time, due to this bit:

   5115               // If we don't actually need the symbols then we did all
   5116               // of the above just to get the section names... we can
   5117               // probably do that in some more efficient way...
   5118               if (c->session.need_symbols)
   5119                 (addrmap[secidx])[sym_addr] = name;

In other words, we do almost all the work of loading the module("*")
elf/dwarf files, just to get a list of section names (which we do need).
Let's find a lighter way of grabbing section name lists.

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