[Issue 6103] New: hasFinalizer field in ClassInfo

[d-bugmail at puremagic.com]

http://d.puremagic.com/issues/show_bug.cgi?id=6103

           Summary: hasFinalizer field in ClassInfo
           Product: D
           Version: D2
          Platform: Other
        OS/Version: Windows
            Status: NEW
          Keywords: performance
          Severity: enhancement
          Priority: P2
         Component: DMD
        AssignedTo: nobody at puremagic.com
        ReportedBy: dsimcha at yahoo.com


--- Comment #0 from David Simcha <dsimcha at yahoo.com> 2011-06-04 09:55:52 PDT ---
ClassInfo needs a hasFinalizer field that is true iff the class or its ancestor
has a non-empty finalizer.  This way, instead of conservatively flagging all
GC-allocated objects with GC.BlkAttr.FINALIZE, only those that need to be
finalized could be flagged.  On this benchmark
(https://github.com/dsimcha/druntime/blob/master/gcBench/tree1.d) avoiding
calling empty finalizers results in about a 20% speedup.

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