[Bug translator/15999] New: symbol-table-based fallback for foo.function() should resolve $$vars etc.

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

https://sourceware.org/bugzilla/show_bug.cgi?id=15999

            Bug ID: 15999
           Summary: symbol-table-based fallback for foo.function() should
                    resolve $$vars etc.
           Product: systemtap
           Version: unspecified
            Status: NEW
          Severity: normal
          Priority: P2
         Component: translator
          Assignee: systemtap at sourceware dot org
          Reporter: fche at redhat dot com

While running 

% stap -p2 -v para-callgraph-verbose.stp
'process("/usr/lib64/libpcp_pmda.so.*").function("*")' 

found something odd with git stap vs. old systemtap. Scripts
like para-callgraph-verbose* use $$parms$$, expecting that
absent or inaccessible $vars will be represented at least by
nothing, but that the script as a whole will run.

This does not seem to be working any more, with the symbol-table
(minidebuginfo) type fallback to dwarf.  Not for example the
_init function:

./stap -v -p2 -e 'probe
process("/usr/lib64/libpcp_pmda.so*").function("_init").call {
println($$parms$$) }' 
Pass 1: parsed user script and 107 library script(s) using
218684virt/36724res/2784shr/34060data kb, in 400usr/40sys/640real ms.
semantic error: unresolved target-symbol expression: identifier '$$parms$$' at
<input>:1:78
        source: probe
process("/usr/lib64/libpcp_pmda.so*").function("_init").call {
println($$parms$$) }
                                                                               
             ^

In previous versions of stap, the probe point itself would not
be accessible.  Now we get them, but don't expand all the
$$vars etc. to at least empty strings.

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