[LLVMbugs] [Bug 267] NEW: post-order iterator should support external storage

[bugzilla-daemon at cs.uiuc.edu]

http://llvm.cs.uiuc.edu/bugs/show_bug.cgi?id=267

           Summary: post-order iterator should support external storage
           Product: libraries
           Version: trunk
          Platform: All
        OS/Version: All
            Status: NEW
          Severity: enhancement
          Priority: P2
         Component: Support Libraries
        AssignedTo: sabre at nondot.org
        ReportedBy: sabre at nondot.org


The po_iterator class in Support/PostOrderIterator.h should support "external"
storage like the DF iterator does.  This is needed when you have several roots
in a graph instead of a single root (you po_iterator with each root in series,
accumulating "visited" information into a set that is maintained across the
calls.  Implementing this should work the same was as the df_ext_iterator works.

I've currently hacked around this by cloning the code and ripping it apart, but
someday the generic support routines should eliminate this code.

-Chris



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