[Bug translator/10830] New: new pp() variant for source-level probe point name

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

As it is, pp() from within a process.mark probe returns something like
process(..).statement(23748234), whereas the original mark() would be
rather more informative appropriate.

One problem is that the current rewriting machinery 
(sdt_query::handle_query_module) creates a synthetic probe that maintains
no relationship to the original one.   If it created an alias_derived_probe,
then at least a aliaswise derivation chain would be preserved.

Considering that existing aliases like "syscall.open" result in pp()'s that
are the most-expanded, 'kernel.function("...")' strings, we may also need
another pp() variant that gives the least-expanded (but including wildcard
expansions) probe point -- i.e., the topmost alias name.  For this function,
say, pp1(), we could return syscall.open and indeed process("...").mark("...").

The future data emitted into the generated C code to enable pp1() could be
conditionally compiled in iff pp1() is present in the script code -- kind of
like what we do for STP_NEED_SYMBOL_DATA etc.

-- 
           Summary: new pp() variant for source-level probe point name
           Product: systemtap
           Version: unspecified
            Status: NEW
          Severity: normal
          Priority: P2
         Component: translator
        AssignedTo: systemtap at sources dot redhat dot com
        ReportedBy: fche at redhat dot com


http://sourceware.org/bugzilla/show_bug.cgi?id=10830

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