doc/layers.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 default
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\graphics default
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\paperfontsize default
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\papersize Default
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\paperpackage a4
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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 1
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\papersides 1
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\paperpagestyle default
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\layout Title
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Layering Functionality in ThiNG
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\layout Standard
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To begin with, we're going to have a simple interpreter of ThiNG code.
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 All the advanced features will come in later revisions - we may even bootstrap
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 before we've implemented some of them!
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\layout Standard
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The features we're particularly interested in include:
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\layout Itemize
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Reflection
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\layout Itemize
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Locations
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\layout Itemize
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Transactions + Exceptions
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\layout Itemize
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Concurrency
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\layout Itemize
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Object Orientation
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\layout Itemize
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Distribution
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\layout Standard
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Reflection comes in three flavours, for ThiNG: behavioural, structural,
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 and lexical.
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 Behavioural reflection will be planned for but not actually implemented
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 in the first few iterations.
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 Structural reflection is a must - generic treatment of objects is required
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 for definition of useful tools such as object explorers etc.
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 Lexical reflection can wait until we need it for transactions and distribution.
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\layout Standard
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Locations are important - they are what, in ThiNG, allows access to meta-level
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 facilities.
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 A computation may stop an entire location and (non-locally) return to its
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 creator either a successful result or an exception.
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 The first iterations will have support for locations.
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\layout Standard
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Transactions and exceptions are closely related.
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 To begin with, we'll be implementing just exceptions - transactions can
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 wait for proper persistence.
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 Exceptions will be implemented using the rudimentary meta-level location
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 structures we'll require for normal non-local returns.
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\layout Standard
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Concurrency will be implemented in the first iterations.
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 A variant on the continuation-passing transform will be used to compute
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 arguments to a message send concurrently.
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\layout Standard
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Object-orientation will be implemented in the first iterations, although
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 not in the way we'll ultimately have it.
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 The goal is to have the lookup phase of OO dispatch go via the location
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 (= the meta-object), but for the first few iterations we'll hardcode the
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 lookup.
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 Allowing customisable lookup comes under the category of behavioural reflection.
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\layout Standard
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Distributed programming will be supported only once we have the rest sufficientl
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y pinned down.
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 It depends on lexical reflection.
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\the_end