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<title>
   Programming Languages Research Group
</title>

<h3>
    Computer Science Department
<br>
    University of Colorado at Boulder
<br>
    Academic Year 1996/97
</h3>
<hr>
<br>



<h1>
   Programming Languages and Compilers Research Group
</h1>


<h2>
   Faculty
</h2>

   <!WA0><a href="http://www.cs.colorado.edu/~waite/Home.html">
      William Waite
   </a>,

   <!WA1><a href="http://www.cs.colorado.edu/~zorn/Home.html">
      Ben Zorn
   </a>,

   <!WA2><a href="http://www.cs.colorado.edu/~heuring/Home.html">
      Vince Heuring 
   </a>,

   <!WA3><a href="http://www.cs.colorado.edu/~grunwald/Home.html">
      Dirk Grunwald
   </a>,

   <!WA4><a href="http://soglio.colorado.edu">
      Wayne Citrin
   </a>.


<h2>
   Research Interests 
</h2>

<p>
Programming language research at the University of Colorado
encompasses design, translation and run-time support.
Our interests span the spectrum, including problems of visual, functional and
object-oriented languages as well as mainstream languages like C and
FORTRAN.
Our emphasis is on practical and experimental work rather than theory.
We have a number of industrial partnerships, and make many of our results
available as running software.

<p>
Specific interests of group members are
the structure and applications of visual languages (Citrin),
methods for improving the performance of object-oriented languages
(Grunwald).
and appropriate techniques to generate optimized code for standard languages
on modern computers (Grunwald, Zorn).
A long-running project is concerned with providing executable
specifications for the entire compilation process and automating the
production of the compiler from them (Waite).

<h2>
   Major Funded Research Projects
</h2>

The main funded research projects in this area include:

<ul>

   <li> High performance environments and languages -- funded by ARPA and
           carried out in cooperation with Indiana University and
	   the University of Oregon
   <p>
   <li> Completely visual programming languages and environments - funded
	   by the Colorado Advanced Software Institute (CASI) and US WEST
	   Technologies.  See
	   <!WA5><a href="http://soglio.colorado.edu/Web/vipr.html">VIPR</a>
	   for more information.  Investigators: Wayne Citrin and Ben Zorn.

</ul>


<h2>
   Facilities
</h2>

Experimental projects in the programming languages area depend on
considerable software infrastructure in addition to the department's
normal complement of compilers, editors and word processors.
Currently these include:

<ul>

   <li> ATOM -- A program instrumentation tool that supports detailed
	   measurements of program performance for both user code and
	   the kernel.
   <p>
   <li> The
	   <!WA6><a href="http://www.cs.colorado.edu/~eliuser">
           Eli System </a>
	   -- A domain-specific programming environment for translator
           construction.
   <p>
   <li> Newtonscript programming environment. An object-oriented programming
           environment for construction of pen-based applications - including
           programming environments - on the Apple Newton Messagepad PDA.
	   A C++ environment for the Newton should be available soon.

</ul>

<h2>
   Relevant publications
</h2>

<ul>

   <li> R. W. Gray, V. P. Heuring, S. P. Levi, A. M. Sloane, W. M. Waite.
           "Eli: A Complete, Flexible Compiler Construction System", CACM,
           35 (February, 1992) 121-131.

   <p>
   <li> U. Kastens, W. M. Waite. "Modularity and Reusability in Attribute
           Grammars", Acta Informatica, 31 (1994) 601-627

   <p>
   <li> Citrin, W., R. Hall, and B. Zorn, "Addressing the Scalability Problem
           in Visual Programming," University of Colorado, Dept. of Computer
	   Science, Technical Report CU-CS-768-95, April 1995.  (Copies in
	   <!WA7><A HREF="file://soglio.colorado.edu/pub/CU-CS-768-95.sea.hqx">
	      Mac Word </A> format and in
	   <!WA8><A HREF="file://soglio.colorado.edu/pub/CU-CS-768-95.ps.Z">
	      Postscript </A> are available.)

   <p>
   <li> Citrin, W., R. Hall, and B. Zorn, "A Visual Lambda Calculus,"
           University of Colorado Department of Computer Science Technical
	   Report CU-CS-757-94 (January 1995).  (Click
	   <!WA9><A HREF="file://soglio.colorado.edu/pub/CU-CS-757-94.sea.hqx">
	   here</A> for a Mac Word version, and
	   <!WA10><A HREF="file://soglio.colorado.edu/pub/CU-CS-757-94.ps.Z">
	   here</A> for a Postscript version)<P>

   <p>
   <li> Citrin, W., Doherty, M., and B. Zorn, "Design of a Completely Visual
	   Object-Oriented Programming Language," in
	   <I>Visual Object-Oriented Programming</I>,
	   M. Burnett, A. Goldberg, and T. Lewis (eds.), New York:
	   Prentice-Hall, 1995 .
	   (<!WA11><A HREF="file://ftp.cs.colorado.edu/pub/techreports/citrin/VOOP-VIPR.ps.Z">
	      Postscript </a> available.)

   <p>
   <li> Citrin, W., Doherty, M., and B. Zorn, "A Formal Definition of Control
	   Semantics in a Completely Visual Language," Dept. of Computer
	   Science, University of Colorado, Boulder, Technical Report
	   CU-CS-672-93, September 1993.
	   (<!WA12><A HREF="file://ftp.cs.colorado.edu/pub/techreports/citrin/VIPR.sea.hqx">
	      Mac Word </a> version available.)

   <p>
   <li> Citrin, W., M. Doherty, and B. Zorn, "Formal Semantics of Control in a
	   Completely Visual Programming Language," <I>Proc. IEEE-CS
	   Symposium on Visual Languages</I>, St. Louis, MO, October 1994.
	   (<!WA13><A HREF="file://ftp.cs.colorado.edu/pub/techreports/citrin/VL94.sea.hqx">
	      Mac Word </a> version available.)

</ul>