54bfc90850
* HACKING: Update. * INSTALL: Update. * NEWS: Update. * README: Update. * doc/announce/ANNOUNCE-0.17: New file.
104 lines
4.4 KiB
Groff
104 lines
4.4 KiB
Groff
Subject: Mes 0.4 released
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I am pleased to announce the release of Mes 0.4, representing 115
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commits over barely two weeks. It now runs Nyacc and PEG and has much
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reduced core.
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* About
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Mes aims to create an entirely source-based bootstrapping path. The
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target is to [have GuixSD] boostrap from a minimal, easily inspectable
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binary --that should be readable as source-- into something close to
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R6RS Scheme.
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As bootstrapping is presumably easiest and probably most fun with
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Scheme, the next step for Mes is mescc: a C compiler/linker to
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boostrap into GNU Gcc and GNU Guile, possibly via Tiny-CC.
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It currently has an interpreter written in C (mes) with Garbage
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Collector (Jam Scraper), a library of loadable Scheme modules--
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notably Dominique Boucher's LALR[1], Pre-R6RS portable
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syntax-case[2] with R7RS ellipsis, Nyacc[3] and Guile's PEG[4]
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--and test suite just barely enough to support a simple REPL
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(repl.mes) and a proof-of-concept C-compiler (mescc.mes) that
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produces an elf from the simplest of C files.
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Mes is inspired by The Maxwell Equations of Software: LISP-1.5[5]
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-- John McCarthy page 13
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* Download
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git clone https://gitlab.com/janneke/mes
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wget https://gitlab.com/janneke/mes/repository/archive.tar.gz?ref=v0.4 -O mes-0.4.tar.gz
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Mes runs from the source tree and can also be built, packaged and
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installed in Guix[SD] by the usual
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guix package -f guix.scm
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* Changes in 0.4 since 0.3
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** Core
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*** Improved performance.
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Macros are now memoized; after expansion and before eval'ing the
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expanded form, their input s-expression is replaced by the expansion.
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This yields a nice performance improvement which finally allowed
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moving all non-essential bits from the C-core into Scheme...including
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the reader. The Scheme reader is much, much slower than the previous
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C version, making Mes--again-- feel slow. Think of that as a feature.
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*** Bootstrap with minimal reader in C.
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The C-reader needs only support reading of words and lists
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(s-expressions), line-comments to read the initial Scheme reader which
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then takes over and handles reading of quoting, characters, strings,
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block-comments.
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*** Reduced size.
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Total C size: ~1500LOC. The main Mes evaluator is now ~1000LOC
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including cell creation and garbage collector. This code is able to
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execute a Scheme program that has been loaded into memory. Another
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~500LOC is spent to load a minimal Scheme program and to dump it, to
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provide a small posix interface, math functions and do some error
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reporting.
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*** Programs can be dumped and loaded using --dump and --load.
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** Language
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*** Minimal syntactic exception support for Nyacc.
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*** Minimal syntactic fluids support for Nyacc.
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*** Keywords are now supported.
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*** Cond now supports =>.
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*** Guile's optargs: lambda* and define* are now supported.
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*** #;-comments are now supported.
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*** Non-nested #| |#-comments are now supported.
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*** Quasisyntax is now supported.
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*** R7RS syntax-rules with custom ellipsis, with-ellipsis are now supported.
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*** 9 new [partial] modules
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(mes fluids), (mes nyacc), (mes optargs), (mes pmatch), (mes peg),
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(srfi srfi-13), (srfi srfi-9-psyntax), (srfi srfi-26), (srfi srfi-43),
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(rnrs arithmetic bitwise), (sxml xpath)
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*** 36 new functions
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1+, 1-, abs, and=>, append-reverse, ash, char<=?, char<?, char>=?,
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char>?, even?, filter, delete, delq, vector-copy, fold, fold-right,
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getenv, iota, keyword->symbol list-head, list-tail, negative?, odd?,
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positive?, remove!, remove, string->number, string-copy,
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string-prefix?, string=, string=?, symbol->keyword symbol-append,
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symbol-prefix?, unless, write, zero?.
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** Noteworthy bug fixes
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*** Macros are now memoized.
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*** An error is reported when using a wrong number of arguments with a call.
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*** Cond now evaluates its test clauses only once.
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*** Append can also handle one argument.
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*** For-each now supports 2 list arguments.
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*** Map now supports 3 list arguments.
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*** Backslash in string is supported.
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*** Closure is not a pair.
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*** All standard characters are supported.
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*** Mescc now also runs in Guile.
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Greetings,
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Jan
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[1] https://github.com/schemeway/lalr-scm
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[2] https://www.cs.indiana.edu/chezscheme/syntax-case/old-psyntax.html
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[3] https://www.nongnu.org/nyacc/
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[4] https://www.gnu.org/software/guile/docs/master/guile.html/PEG-Parsing.html
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[5] http://www.softwarepreservation.org/projects/LISP/book/LISP%201.5%20Programmers%20Manual.pdf
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