100 lines
3.7 KiB
Groff
100 lines
3.7 KiB
Groff
Subject: on bootstrapping: first Mes 0.3 released
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I am pleased to announce the first release of Mes: 0.3, representing
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152 commits over 3 months since the second status report[1].
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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 with
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test suite just barely enough to support a simple REPL (repl.mes)
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and a proof-of-concept c-compiler (mescc.mes) that produces an elf
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from the simplest of C files.
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Mes is inspired by The Maxwell Equations of Software: LISP-1.5[2]
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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=v0.3 -O mes-0.3.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 0.3 since 0.2
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** Core
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*** Number-based rather than pointer-based cells.
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*** Garbage collector aka Jam scraper.
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A variant on SICP's stop and copy Garbage Collector (Jam Scraper?)
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algorithm has been implemented.
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*** The reader has been moved to Scheme.
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** Language
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*** Simple loadable modules.
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*** Srfi-9 and match use handwritten syntax-rules (mes-use-module (mes syntax)).
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*** Optional syntax-case using psyntax (mes-use-module (mes psyntax)).
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** Noteworthy bug fixes
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*** Srfi-0 has been fixed.
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* Changes in 0.2 since 0.1
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** Core
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*** Names of symbols and strings are list of characters [WAS: c-string].
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*** Sc-expand from pre-R6RS's psyntax has been integrated.
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*** Undefined variable error now shows the name of the undefined variable.
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*** There is now only one SCM type for builtin functions.
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*** Macro expansion has been cleaned-up.
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** Language
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*** Mes now provides a subset of R6RS.
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*** Mes now provides syntax-case.
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*** Mes now provides `load'.
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** Noteworthy bug fixes
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*** Using values as second parameter of builtin function yields first value.
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*** Quoted internals (e.g. 'if 'lambda) are now symbols.
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*** Syntax error now exits.
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*** Make+Bash voodoo has been replaced by build-aux/mes-snarf.scm.
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*** Apply now accepts multiple list arguments.
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*** Apply of character, inernal, number, string is an error.
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*** Quasisyntax reading
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* Changes in 0.1 (since progress report #2)
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** Core
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*** expand_macro is now a separate function.
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*** A smaller core can now compiled using BOOT=1.
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The smaller core does not provide define, define-macro, or quasiquote;
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these are provided from a Scheme version of implemented eval/apply.
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** Language
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*** Mes now provides a subset of R5RS.
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*** Mes now provides let-syntax.
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*** Mes now provides match.
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*** Mes now provides quasisyntax, unsyntax and unsyntax-splicing.
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** User interface
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*** Mes now provides a REPL, run:
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scripts/repl.mes
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*** Mes compiler can be run as a script:
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scripts/mescc.mes doc/examples/main.c
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*** Macro expansion can be inspected in the REPL, e.g.:
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,expand (and 0 1)
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** Noteworthy bug fixes
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*** Performance: scripts/mescc.mes now takes 2s to compile main.c (was 1'20").
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*** Symbols are now truly unique.
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* '(), #t, #f are no longer symbols.
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Greetings,
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Jan
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[1] https://lists.nongnu.org/archive/html/guile-user/2016-09/msg00061.html
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[2] http://www.softwarepreservation.org/projects/LISP/book/LISP%201.5%20Programmers%20Manual.pdf
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