doc/metaoperations.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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\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 1
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\papersides 1
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\paperpagestyle default
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\layout Title
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Metaoperations in ThiNG
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\layout Author
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Tony Garnock-Jones <tonyg@kcbbs.gen.nz>
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\layout Section
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Metaprotocol
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\layout Standard
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\emph on 
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Q: 
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\emph default 
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What is bytecode?
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\emph on 
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 A: 
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\emph default 
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A coding for a list of messages sent to the current location.
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\layout Standard
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Viewing bytecode this way leads to a definition of a 3-LISP style tower-of-inter
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preters.
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 The location is the interpreter running at phase1, interpreting code at
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 phase0.
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 The location's location is at phase2, and so on.
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 Each location runs bytecode - a sequence of messages sent to the phase
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 above.
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\layout Standard
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Here are the bytecode operations in use in the dummy ThiNG prototype:
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\layout Itemize
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local - load a value from a lexically-scoped variable
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\layout Itemize
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global - load a value from a per-location variable.
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 This translates to a slot access on the contents of the locations' global
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 cell, ie.
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 a unary method invocation on the globals object.
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 Adjusting the contents of the cell and updating the location with new cells
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 gives quite fine-grained thread-group-local control over global variables,
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 a.k.a.
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 ambient capabilities.
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\layout Itemize
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send - computes a number of values (in parallel), tuples them up with a
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 selector, and sends them through the dispatch+apply mechanism in the metaobject.
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\layout Itemize
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closure - takes a literal block object, cloning it with the current environment,
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 thus making a closure.
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\layout Itemize
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begin - performs a sequence of instructions.
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\layout Itemize
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scope - introduces a fresh named location, essentially starting a new sub-thread
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-group.
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 Eventually this will be modified to allow object-code-level control over
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 the shape of the new location - within limits.
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\layout Itemize
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literal - loads a literal object from the code object's literal vector
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\layout Itemize
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update - clones an existing object, adding or updating slots according to
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 the recipe attached to the instruction.
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\layout Itemize
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tuple - computes a number of values in parallel, and entuples them before
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 handing the tuple back to its continuation
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\layout Itemize
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resend - reinvokes the dispatch mechanism, starting from the current method.
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\layout Itemize
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method - should be syntactic sugar for a number of reflective operations,
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 although currently is hardcoded since the necessary location-manipulation
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 isn't even implemented, let alone exposed as reflective primitives to the
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 object level.
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\layout Standard
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Now, with luck once the compiler gets clever enough to inline away some
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 temporary object construction, we will be able to remove tuples - the replaceme
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nt will simply be the construction of a results object via normal update:
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\family typewriter 
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(r1 := val1 r2 := val2 ...)
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\family default 
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.
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 This introduces an asymmetry: function 
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\emph on 
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arguments
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\emph default 
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 will be passed using anonymous (ie.
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 indexed) tuples, but function 
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\emph on 
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results
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\emph default 
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 will be passed using named tuples.
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\begin_inset Foot
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collapsed false
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\layout Standard
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Perhaps it's worth thinking about how we might get named tuples for function
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 calls, too? One way might be to use selector fragments for positional arguments
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, although that leaves the question of naming the leftmost argument (eg.
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 in a unary message-send).
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 It's interesting, though, because one might be able to make the argument-record
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 a step in the delegation-chain for the running frame.
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\end_inset 
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\layout Standard
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Execution can be viewed as a kind of fold over a sequence of operations,
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 accumulating a changed interpreter (location) state.
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 The operations folded over, then, are stack manipulations (for computing
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 arguments), delay, promise and cell operations, and:
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\layout Itemize
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\family typewriter 
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loc\SpecialChar ~
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loadLocal:\SpecialChar ~
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#
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\emph on 
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name
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\layout Itemize
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\family typewriter 
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loc globals peek 
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\emph on 
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name
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\layout Itemize
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\family typewriter 
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loc send:\SpecialChar ~
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#
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\emph on 
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selector
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\emph default 
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 to:\SpecialChar ~
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{
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\emph on 
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arg
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\emph default 
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.
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\emph on 
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\SpecialChar ~
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arg
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\emph default 
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.\SpecialChar ~
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...}
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\layout Itemize
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\family typewriter 
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loc close: 
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\emph on 
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blocktemplate
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\layout Itemize
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\family typewriter 
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loc evaluate: 
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\emph on 
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bytecode
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\emph default 
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 in: 
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\emph on 
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freshlocationtemplate
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\layout Itemize
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\family typewriter 
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loc loadLiteral: 
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\emph on 
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literalvalue
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\layout Itemize
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\family typewriter 
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loc update: 
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\emph on 
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expr
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\emph default 
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 by: 
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\emph on 
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updatetemplate
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\layout Itemize
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\family typewriter 
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loc resend1 
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\begin_inset Quotes eld
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\end_inset 
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avoid keyword
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\begin_inset Quotes erd
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\end_inset 
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\layout Section
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Maps and Traits in functional prototype objects
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\the_end