[Bug translator/17966] New: @defined always returns true in return probes

["aram.h at mgk dot ro" <sourceware-bugzilla at sourceware dot org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=17966

            Bug ID: 17966
           Summary: @defined always returns true in return probes
           Product: systemtap
           Version: unspecified
            Status: NEW
          Severity: normal
          Priority: P2
         Component: translator
          Assignee: systemtap at sourceware dot org
          Reporter: aram.h at mgk dot ro
                CC: jistone at redhat dot com

@defined can't be used in return probes because it always returns 1.

stap -e 'probe process("bash").function("*").return {r0 = @defined($_r0) ? $_r0
: 0; printf ("r0: %d\n", r0); exit ()}'
WARNING: function _start return probe is blacklisted: keyword at <input>:1:1
 source: probe process("bash").function("*").return {r0 = @defined($_r0) ? $_r0
: 0; printf ("r0: %d\n", r0); exit ()}
         ^
semantic error: unresolved target-symbol expression: identifier '$_r0' at :1:67
        source: probe process("bash").function("*").return {r0 = @defined($_r0)
? $_r0 : 0; printf ("r0: %d\n", r0); exit ()}
                                                                               
  ^

Pass 2: analysis failed.  [man error::pass2]
: xgene:tmp;

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