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