176 lines
8.3 KiB
Org Mode
176 lines
8.3 KiB
Org Mode
-*-mode:org-*-
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* ROADMAP
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** TODO release 0.5
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1. mes.c: prototype Scheme interpreter in C, mature enough to run
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2. guile/mescc.scm: C compiler on [Guile] Scheme, that can compile
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2a. scaffold/hello.c: Simplest C program, compiled with 2.
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2b. scaffold/micro-mes.c: main of 3. (2nd Scheme interpreter) + mlib.c
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2c. scaffold/cons-mes.c: run simple hardcoded sexp
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2d. scaffold/tiny-mes.c: load memory dump, run simple sexp
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2e. scaffold/t.c: c compiler tests, enough to support compiling
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3. scaffold/mini-mes.c: 2nd Scheme intepreter in C, without [g]libc, using
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4. mlib.c: Minimal Mescc C library
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4a. scaffold/hello.c: Simplest C program, compiled with 5.
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4b. scaffold/micro-mes.c: main of 3. (2nd Scheme interpreter) + mlib.c
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4c. scaffold/cons-mes.c: run simple hardcoded sexp
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4d. scaffold/tiny-mes.c: load memory dump, run simple sexp
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4e. scaffold/t.c: run c test suite with scripts/mescc.mes
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5. scripts/mescc.mes: C compiler on mes, that can build scaffold/mini-mes.c
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5a. remove __MESC__/__NYACC__ C workarounds in gc.c and vector.c
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5b. module/language/c99/compiler.mes: refactor expr->arg, expr->accu, ast->info
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5c. merge *.c into scaffold/mini-mes.c
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5d. merge scaffold/mini-mes.c into mes.c
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5x. *we are here*
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make guile-t, make guile-mini-mes, make mes-mini-mes
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6. scripts/mescc.mes: C compiler on mes, that can build mes
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7. release self-hosting Mes 0.5
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7a. discuss full source bootstrap strategy on guile-user with
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Orians Jeremiah (stage0+) Luca Saiu's (GNU Epsilon).
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** release 0.x, unsorted
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- produce intermediate annotated assembly-like mes.S
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- AND/OR: connect to GNU Epsilon's VM
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- AND/OR: connect to OriansJ's stage0...LISP bootstrapping tools
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- real module support, bonus for supporting Guile's define-module/define-public syntax
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- get full source syntax-case up (Andre van Tonder?) OR drop
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psyntax/syntax-case and rewrite Nyacc without syntax-case+R7RS Ellipsis
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- support regexp OR rewrite Nyacc without regexps
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- split-off Guile C compiler as standalone Guile project, still
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respecting no-syntax-case bootstrap requirement
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*** Compile the [[https://en.wikipedia.org/wiki/Tiny_C_Compiler][Tiny C Compiler]]
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- build tcc (tinycc)
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** release 1.0
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- work to replace GuixSD's bootstrap binaries for x86
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- more architectures?
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** DONE
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** Support call-with-current-continuation, refactor catch/throw
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** 0.4: Support Nyacc, Gcc-compiled Mes compiles minimal main.c using nyacc
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** 0.3: Garbage collector
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** 0.2: Support psyntax
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** 0.1: Mes eval/apply feature complete; support syntax-rules, compile main.c using LALR, dump ELF
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* Full source bootstrapping
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** R6RS-like scheme interpreter
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This first part is prototyped in C by the mes.c core and Scheme
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bootstrap code in module/. Of course, while mes.c is pretty small it
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cannot serve as a full source solution.
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The initial idea was to have the minimal core support LISP-1.5 (or
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something very close to that as a tribute to John McCarthy) and extend
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eval/apply from LISP-1.5 source with define, define-macro etc. and
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metamorphose into R6RS. It seemed to work but performance of the
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LISP-intepreted RRS was so bad (~1000x slower than initial LISP-1.5)
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that this track was abandoned after the initial ANNOUNCE.
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The route changed, trying to strike a balance between core size and
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performance: still writing as much as possible in Scheme but having a
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mescc compiler that takes not more than some seconds to run.
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Now that we have [[https://github.com/schemeway/lalr-scm][Dominique Boucher's LALR]], a [[https://www.cs.indiana.edu/chezscheme/syntax-case/old-psyntax.html][Pre-R6RS portable
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syntax-case]] with R7RS ellipsis, [[http://www.nongnu.org/nyacc/][Nyacc]] and [[https://www.gnu.org/software/guile/docs/master/guile.html/PEG-Parsing.html][Guile's PEG]] parsers, it's
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time to start doing something useful.
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* Bugs
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** test/match.test ("nyacc-simple"): hygiene problem in match
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** The Scheme reader is very slow.
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** Fluids are a hack for Nyacc.
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** Prototype mes.c depends on a C compiler.
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*** Translate C-prototype mes.c into annotated hex?
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One idea is to use OriansJ's amazing self-hosting [[https://github.com/oriansj/stage0][stage0]] hex assembler
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and minimal bootstrap binaries and rewrite the mes.c core to directly
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bootstrap into Scheme.
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*** Rewrite mes.c in Schemy/Sexp-C and generate annotated hex?
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Another idea (thanks Rutger!) is to rewrite the mes.c core in a s-exp
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C/Assembly variant and thave mescc produce the simple, annotated
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bootstrap binary.
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*** Compile the [[https://en.wikipedia.org/wiki/Tiny_C_Compiler][Tiny C Compiler]]
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* OLD: Booting from LISP-1.5 into Mes
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Mes started out experimenting with booting from a hex-coded minimal
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LISP-1.5 (prototype in mes.c), into an almost-RRS Scheme.
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When EOF is read, the LISP-1.5 machine calls loop2 from loop2.mes,
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which reads the rest of stdin and takes over control. The functions
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readenv, eval and apply-env in mes.mes introduced define, define-macro
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quasiquote and macro expansion.
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While this works, it's amazingly slow. We implemented a full reader
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in mes.c, which makes running mes:apply-env mes:eval somewhat
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bearable, still over 1000x slower than running mes.c.
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Bootstrapping has been removed and mes.c implements enough of RRS to
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run a macro-based define-syntax and syntax-rules.
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loop.mes and mes.mes are unused and lagging behind. Probably it's not
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worth considering this route without a VM. GNU Epsilon is taking the
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more usual VM-route to provide multiple personas. While that sounds
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neat, Lisp/Scheme, bootstrapping and trusted binaries are probably not
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in scope as there is no mention of such things; only ML is mentioned
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while Guile is used for bootstrapping.
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* Assorted ideas and info
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** Using GDB on assembly/a.out
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info registers
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p/x $eax
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p/x $edx
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set disassemble-next-line
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gdb-display-disassembly-buffer
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b *0x804a79d
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** Create memory dump with 32 bit Gcc compiled Mes
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guix environment --ad-hoc --system=i686-linux gcc-toolchain -- bash -c 'make mes CC=i686-unknown-linux-gnu-gcc LIBRARY_PATH=${PATH%%/bin:*}/lib'
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mv mes mes-32
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MES_TINY=1 ./mes-32 --dump < module/mes/tiny-0.mes > module/mes/tiny-0-32.mo
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./mes-32 --dump < module/mes/read-0.mes > module/mes/read-0-32.mo
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** C parser/compiler
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*** [[https://savannah.gnu.org/projects/nyacc][nyacc]]
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*** PEG: [[http://piumarta.com/software/peg/][parse C using PEG]]
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*** [[https://en.wikipedia.org/wiki/Tiny_C_Compiler][Tiny C Compiler]]
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*** [[http://www.t3x.org/subc/index.html][Sub C]]
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*** [[https://groups.google.com/forum/#!topic/comp.lang.lisp/VPuX0VsjTTE][C intepreter in LISP/Scheme/Python]]
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** C assembler/linker
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*** [[http://www.tldp.org/HOWTO/Assembly-HOWTO/linux.html][Assembly HOWTO]]
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*** ELF
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7f 45 4c 46
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*** [[http://www.muppetlabs.com/~breadbox/software/tiny/][Small ELF programs]]
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*** [[http://www.cirosantilli.com/elf-hello-world/][Elf hello world]]
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** SC - c as s-expressions
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sc: http://sph.mn/content/3d3
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** RNRS
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*** [[http://www.scheme-reports.org/][Scheme Reports]]
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*** [[ftp://publications.ai.mit.edu/ai-publications/pdf/AIM-349.pdf][Scheme - Report on Scheme]]
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*** [[ftp://publications.ai.mit.edu/ai-publications/pdf/AIM-452.pdf][RRS - Revised Report on Scheme]]
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** tiny schemes
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http://forum.osdev.org/viewtopic.php?f=15&t=19937
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http://www.stripedgazelle.org/joey/dreamos.html
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http://armpit.sourceforge.net/
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http://common-lisp.net/project/movitz/movitz.html
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<civodul> janneke: https://github.com/namin/inc looks interesting [15:18]
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** Orians Jeremiah
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<OriansJ> janneke: also, if you look at
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https://github.com/oriansj/stage0/tree/master/stage2/High_level_prototypes
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[the garbage collected lisp I implemented], if there are any pieces
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I could add to finish off your mes lisp bootstrap just let me know
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because I would be more than happy to do that :D
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<janneke> OriansJ: that's what I'm hoping for, that our efforts can be
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complementary and we can work together
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*** lfam (~lfam@2601:47:4180:2ffb:7c05:17de:cf5f:23ef) has quit: Ping timeout:
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246 seconds [00:22]
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<janneke> exciting times! [00:23]
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<janneke> OriansJ: i looked a few times and saw 'LISP empty', so thanks for
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the pointer! [00:24]
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<civodul> OriansJ, janneke: from that page, there's also:
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https://web.archive.org/web/20160604035203fw_/http://homepage.ntlworld.com/edmund.grimley-evans/bcompiler.html
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** C4/C500
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https://web.archive.org/web/20160604041431/http://homepage.ntlworld.com/edmund.grimley-evans/cc500/cc500.c
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https://github.com/rswier/c4/blob/master/c4.c
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