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Date: Tue, 10 Dec 2002 16:12:16 +0100
Subject: PEM | 12.12.02 | C.001

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   Dear colleagues,

   The following PEM is about Java!

   This announcement can be found at <http://www.cwi.nl/~pem>

                Java Class Hierarchies with Maximal Sharing

   Date:    12.12.02
   Time:    10:00
   Venue:   C.001
   Speaker: Jurgen Vinju
   Title:   Java Class Hierarchies with Maximal Sharing

   The  implementation  of  compilers, interpreters, program analysis and
   program transformation tools in Java usually requires an efficient and
   informative   intermediate   data-structure.  Efficient  generic  data
   representations   exist,   but   they   provide   untyped  programming
   interfaces.  On  the other hand there are generators that create typed
   interfaces but the generated classes are not efficient enough for many
   applications.

   We  propose  to  merge  these  two  concepts.  We reuse a generic data
   structure, ATerms, and generate a typed layer of subclasses based on a
   simple  datatype  specification. The generated subclasses inherit many
   properties of ATerms: a textual representation and maximal sharing. At
   the   same   time   the   subclasses   are   type  specific,  ensuring
   well-formedness of the data-structure and allowing for specializations
   by overriding the generic ATerm implementation.

   This is joint work with Pierre-Etienne Moreau from Loria in France and
   Mark van den Brand.

   In  this  talk  we  will  discuss the general design and some specific
   techniques  used  to  implement  it.  The  tool is currently used in a
   complete refactoring of the Tom compiler.

   Have a nice day.
     _________________________________________________________________

   The  programming environment meetings are a forum for the presentation
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   The    program    of    the    meetings    is    available   on   WWW:
   http://www.cwi.nl/~pem
     _________________________________________________________________