[Bug translator/11847] New: sdt.h for ppc, -mno-regnames, use %I0%0

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

We sort of gave up back in bug #11821, but it turns out we can
do somewhat better, if the "%0" is replaced with "%I0%0" for
each SDT_V2 operand slot, for powerpc only.  This would cause
literals to be prefixed with "i", resolving the ambiguity.

Then in turn the translator's $nnnn regex matcher (tapsets.cxx:4675ish)
could accept "i" as a literal number prefix, not just "$".

Up to this point, it's all compatible with SDT_V2 binaries & logic.

However, the later REGISTER case can't presume that the lack-of-"i"
means a register number, since SDT_V2 binaries may exist that precede
this particular change.  So a later magic number may need to be assigned
to communicate to the translator that %I0%0 was specified, and thus
lack-of-"i" means "register number, for sure".

-- 
           Summary: sdt.h for ppc, -mno-regnames, use %I0%0
           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=11847

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