doc/redb.lyx
author Tony Garnock-Jones <tonygarnockjones@gmail.com>
Wed, 16 Jan 2019 17:15:58 +0000
changeset 438 1fe179d53161
parent 0 ea4e1a00864c
permissions -rw-r--r--
Add missing primitive implementation for the plain interpreter.
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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#LyX 1.3 created this file. For more info see http://www.lyx.org/
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\lyxformat 221
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\textclass article
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\language english
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\inputencoding auto
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\fontscheme palatino
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\graphics default
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\paperfontsize default
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\spacing single 
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\papersize a4paper
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\paperpackage widemarginsa4
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\use_geometry 0
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\use_amsmath 0
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\use_natbib 0
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\use_numerical_citations 0
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\paperorientation portrait
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\secnumdepth 3
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\tocdepth 3
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\paragraph_separation indent
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\defskip medskip
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\quotes_language english
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\quotes_times 2
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\papercolumns 2
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\papersides 1
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\paperpagestyle default
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\layout Title
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A Reflective, Eager, Distributed Blue Calculus
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\layout Author
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Tony Garnock-Jones <tonyg@kcbbs.gen.nz>
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\newline 
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Michael Bridgen <mikeb@squaremobius.net>
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\layout Date
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17 October, 2004
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\layout Abstract
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Boudol's blue calculus (the 
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\begin_inset Formula $\pi^{*}$
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\end_inset 
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-calculus) allows a natural embedding of both the call-by-name 
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\begin_inset Formula $\lambda$
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\end_inset 
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-calculus and Milner's 
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\begin_inset Formula $\pi$
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\end_inset 
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-calculus.
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 We extend the blue calculus with eager (call-by-value) parallel evaluation,
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 a notion of evaluation location similar to that of the distributed join
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 calculus, and basic lexical reflection facilities to arrive at an implementable
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 distributed process language rich enough to act as the virtual machine
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 for a Self-like object-oriented environment.
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\layout Section
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Introduction
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\layout Standard
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Our goal is an implementable, reflective, dynamic, efficient concurrent
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 process language that can readily support object-oriented features in the
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 style of Self 
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\begin_inset LatexCommand \cite{ungar91self}
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\end_inset 
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 or SmallTalk 
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\begin_inset LatexCommand \cite{goldberg83smalltalk}
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\end_inset 
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 while not precluding the use of ML-like functional features.
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 The language should be rich enough to support its own development and runtime
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 environment, like SmallTalk, but should be as concurrent as the 
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\begin_inset Formula $\pi$
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\end_inset 
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-calculus 
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\begin_inset LatexCommand \cite{milner91polyadicpi}
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\end_inset 
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.
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\begin_inset Marginal
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collapsed false
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\layout Standard
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Mention Obliq?
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\end_inset 
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Like the distributed join calculus 
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\begin_inset LatexCommand \cite{join-tutorial}
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\end_inset 
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, our language should provide a notion of the location in which a computation
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 is proceeding, and an idea of the location to which messages sent along
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 a name should be directed.
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\layout Standard
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SmallTalk and Self both, to a point, provide a completely uniform universe
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 of objects to the programmer.
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 The illusion breaks down once the programmer starts to examine the details
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 of the virtual-machine such as call frames, processes, methods, blocks
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 and bytecodes.
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 The innermost parts of a Self or SmallTalk system cease being data (objects),
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 and start being programs (processes).
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 The line between the two levels is quite sharply defined.
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 SmallTalk-like virtual machines are very similar to traditional sequential
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 stack-based computers, in that they have a stack and a small set of registers,
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 and in that any multiprocessing is a construction layered atop the basic
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 sequential machine.
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 Our language is intended to provide a replacement for the low-level virtual
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 machine part of a SmallTalk-like system that does well what SmallTalk virtual
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 machines do poorly - that is, integrate concurrent and distributed features
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 with traditional object-oriented and functional programming - and provides
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 a definition
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\begin_inset Marginal
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collapsed false
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\layout Standard
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a description?
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\end_inset 
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 of the lowest-level behaviour of the language that is amenable to various
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 kinds of formal analysis.
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\layout Standard
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While SmallTalk provides an almost uniform object-oriented universe at levels
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 above the virtual machine, our language is to provide a uniform process-oriente
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d universe at the virtual machine level.
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 An object-oriented description of the system can then be built atop the
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 virtual machine in exactly the way current SmallTalk and Self systems build
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 on their virtual machines.
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\layout Standard
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We begin in section 
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\begin_inset LatexCommand \ref{sec:The-Blue-Calculus}
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\end_inset 
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 by briefly reviewing Boudol's blue calculus.
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 Section !!! alters the basic calculus to perform call-by-value evaluation.
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 Section !!! further extends the calculus to evaluate subexpressions of
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 a combination in parallel.
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 Section !!! adds a notion of location to the calculus.
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 Section !!! introduces a few small features essential to reflection, which
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 is finally introduced in section !!!.
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 Section 
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\begin_inset LatexCommand \ref{sec:Related-Work}
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\end_inset 
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 touches on related work, and section 
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\begin_inset LatexCommand \ref{sec:Conclusion}
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\end_inset 
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 concludes the paper.
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\layout Section
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The Blue Calculus
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\layout Standard
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\begin_inset LatexCommand \label{sec:The-Blue-Calculus}
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\end_inset 
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Boudol's blue calculus (the 
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\begin_inset Formula $\pi^{*}$
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\end_inset 
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-calculus) 
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\begin_inset LatexCommand \cite{boudol97picalculus}
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\end_inset 
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 allows a natural embedding of both the call-by-name 
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\begin_inset Formula $\lambda$
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\end_inset 
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-calculus and Milner's 
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\begin_inset Formula $\pi$
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\end_inset 
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-calculus.
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 It makes a good foundation for our language - it supports both functional
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 and process-oriented styles of computation, provides a syntactic distinction
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 avoiding the problem of full distributed input capability, and can be readily
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 extended with lexical reflection and with locations in the style of the
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 distributed join calculus.
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\layout Section
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Related Work
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\layout Standard
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\begin_inset LatexCommand \label{sec:Related-Work}
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\end_inset 
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Several candidate systems besides the blue calculus were examined as potential
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 starting points for this work.
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 Cardelli's mobile ambients 
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\begin_inset LatexCommand \cite{CardelliGordon98:ambients}
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\end_inset 
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 provide a suitable notion of location that could be extended with reflective
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 capabilities, but the language leaves the routing of messages in the hands
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 of the programmer, which seems too low-level for simple efficient implementatio
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n.
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 Cardelli's Obliq system 
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\begin_inset LatexCommand \cite{cardelli95language}
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\end_inset 
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 provides a high-level account of distributed object-oriented computation,
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 but does not map well to a simple implementation - it is too high-level.
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 Fournet's distributed join calculus 
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\begin_inset LatexCommand \cite{FournetGonthier96,join-tutorial,Fournet98:PhD}
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\end_inset 
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 provides a good treatment of message routing and process location while
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 also providing an Actor-like 
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\begin_inset LatexCommand \cite{agha86actors}
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\end_inset 
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 semantics, but ties together the notion of name definition and message
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 reception in a way that makes reflection difficult.
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\layout Standard
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[[Current work in the SmallTalk community 
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\begin_inset LatexCommand \cite{salzman04pmd,ingalls97squeak}
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\end_inset 
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 is based on traditional virtual machines.]] Even Slate, a 
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\begin_inset Quotes eld
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\end_inset 
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clean-slate SmallTalk
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\begin_inset Quotes erd
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\end_inset 
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, is based around an ad-hoc byte-coded virtual machine, despite its stated
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 goals of integrated concurrent and distributed programming.
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\begin_inset Marginal
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collapsed false
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\layout Standard
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check the goals!
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\end_inset 
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\layout Section
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Conclusion
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\layout Standard
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\begin_inset LatexCommand \label{sec:Conclusion}
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\end_inset 
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\layout Standard
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\begin_inset LatexCommand \BibTeX[acm]{/Users/tonyg/Documents/tonyg}
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\end_inset 
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\the_end