209 lines
8.4 KiB
Org Mode
209 lines
8.4 KiB
Org Mode
-*- org -*-
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#+TITLE: Hacking GNU Mes
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* SETUP
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guix environment -l guix.scm #64 bit + 32bit
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CC=i686-unknown-linux-gnu-gcc ./configure
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CC=arm-unknown-linux-gnu-gcc ./configure
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or
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./configure
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The 64bit bootstrap is not supported; MesCC needs work to be able to
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compile a functional tinycc.
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* BUILD
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GNU Guile can be used as a replacement for Mes. It's faster and has
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much better error handling.
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#+BEGIN_SRC bash
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make MES=guile
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make check MES=guile
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#+END_SRC
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Configure to compile with Tiny CC
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#+BEGIN_SRC bash
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./configure CC=tcc --host=i686-unknown-linux-gnu --with-courage
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#+END_SRC
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* DEBUG
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MES_DEBUG=<level> mes
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** Levels
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1) Informational:
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- MODULEDIR
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- included SCM modules and sources
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- result of program
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- gc stats at exit
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2) opened files
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3) runtime gc stats
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4) detailed info
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- parsed, expanded program
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- list of builtins
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- list of symbol
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- opened input strings
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- gc details
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5) lots of data
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- usage of opened input strings
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- bytes read
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6) globals
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* TESTING
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** make check recheck=true TESTS="tests/base lib/tests/scaffold/t.c"
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** mescc
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*** To skip MES tests, in "./check.sh", comment-out check-boot.sh, check-mes.sh.
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*** Running individual tests
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#+BEGIN_SRC bash
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cd gcc-lib
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V=2 CC=i686-unknown-linux-gnu-gcc ../pre-inst-env test-c.sh ../lib/tests/scaffold/t.c
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#+END_SRC
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#+BEGIN_SRC bash
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cd mescc-lib
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V=2 CC=mescc ../pre-inst-env test-c.sh ../lib/tests/scaffold/t.c
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#+END_SRC
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* Bugs
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** mes: performance, Mes is now 2-10x slower than Guile.
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** mes/mescc lack support for fork/exec on the Hurd.
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** mes: gcc-x86_64 compiled mes segfaults with small arena, or gc_up_arena.
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** mes: gcc-x86 compiled, tests/srfi-13.test number->string INT-MIN fails:
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test: number->string INT-MIN: fail
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expected: -2147483648
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actual: -./,),(-*,(
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** tcc: tcc-built lib/libc+tcc.c segfaults with mes, with tcc.
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** mes: remove pmatch-car/pmatch-cdr hack.
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** mescc: softcode stack frame size, now hardcoded and very large
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** mes+mescc: parse tcc.c->tcc.E works, compile tcc.E -> tcc.M1 segfaults.
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time GUILE_LOAD_PATH=/home/janneke/src/nyacc/module:$GUILE_LOAD_PATH ../mes/scripts/mescc -E -o tcc.E -I . -I ../mes/lib -I ../mes/include -D 'CONFIG_TCCDIR="usr/lib/tcc"' -D 'CONFIG_TCC_CRTPREFIX="usr/lib:{B}/lib:."' -D 'CONFIG_TCC_ELFINTERP="/gnu/store/70jxsnpffkl7fdb7qv398n8yi1a3w5nx-glibc-2.26.105-g0890d5379c/lib/ld-linux.so.2"' -D 'CONFIG_TCC_LIBPATHS="/home/janneke/src/tinycc/usr/lib:{B}/lib:."' -D 'CONFIG_TCC_SYSINCLUDEPATHS="../mes/include:usr/include:{B}/include"' -D CONFIG_USE_LIBGCC=1 -D 'TCC_LIBGCC="/home/janneke/src/tinycc/usr/lib/libc+tcc-gcc.mlibc-o"' -D CONFIG_TCC_STATIC=1 -D ONE_SOURCE=yes -D TCC_TARGET_I386=1 -D BOOTSTRAP=1 tcc.c
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time GUILE_LOAD_PATH=/home/janneke/src/nyacc/module:$GUILE_LOAD_PATH MES_ARENA=200000000 ../mes/scripts/mescc -c -o tcc.M1 tcc.E
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** mescc: 64 bit compiled mes loses top 4 bytes
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*** 64 bit mescc-compiled mes:
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#x100000000 => 0
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(modulo 1 #x100000000) => divide-by-zero
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*** 64 bit gcc-compiled mes:
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#x100000000 => 0
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(modulo 1 #x100000000) => 1
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** mescc: 7n-struct-struct-array.c: struct file f = {"first.h"};
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** test/match.test ("nyacc-simple"): hygiene problem in match
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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 $edx
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set disassemble-next-line on
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gdb-display-disassembly-buffer
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b *0x804a79d
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** Create memory dump with 32 bit Gcc compiled Mes
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make out/i686-unknown-linux-gnu-mes
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out/i686-unknown-linux-gnu-mes --dump < module/mes/read-0.mes > module/mes/read-0-32.mo
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x/s *((char **)($rsp+8))
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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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** Compilers for free
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http://codon.com/compilers-for-free
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** Small lisps
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*** [[https://www.mirrorservice.org/sites/www.bitsavers.org/bits/TI/Explorer/zeta-c/][ZETA-C]]
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** Small C compilers
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*** tinycc
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*** [[https://github.com/rui314/8cc][8cc]] -- a C11 compiler, but simple
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8cc is a compiler for the C programming language. It's intended to
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support all C11 language features while keeping the code as small and
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simple as possible.
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*** pcc
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*** early GCC?
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https://miyuki.github.io/2017/10/04/gcc-archaeology-1.html
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*** [[http://tack.sourceforge.net/][ack]]
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<rain1> it may be possible to compile like this: mes |> ack |> pcc |> tcc |>
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gcc 4.7.4 |> gcc later version... up to modern
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*** [[https://web.archive.org/web/20160402225843/http://homepage.ntlworld.com/edmund.grimley-evans/cc500/][cc500]]
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** rain1's Bootstrapping Wiki: https://bootstrapping.miraheze.org/wiki/Main_Page
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** rain1's hex86
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https://notabug.org/rain1/hex86/src/master/tests/hex0b3.hex86
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** <pdewacht> janneke, have you ever tried testing mescc with csmith? [10:55]
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** <pdewacht> e.g. as described here
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https://jamey.thesharps.us/2016/07/15/testing-strategies-for-corrode/
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("Randomized testing with Csmith and C-Reduce") [10:58]
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** linux syscalls: https://fedora.juszkiewicz.com.pl/syscalls.html
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* legalese
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Copyright © 2016,2017,2018,2019,2021 Jan (janneke) Nieuwenhuizen <janneke@gnu.org>
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Copying and distribution of this file, with or without modification,
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are permitted in any medium without royalty provided the copyright
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notice and this notice are preserved.
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