427 lines
7.2 KiB
C
427 lines
7.2 KiB
C
/* -*-comment-start: "//";comment-end:""-*-
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* GNU Mes --- Maxwell Equations of Software
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* Copyright © 2016,2017,2018 Jan (janneke) Nieuwenhuizen <janneke@gnu.org>
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*
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* This file is part of GNU Mes.
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*
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* GNU Mes is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 3 of the License, or (at
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* your option) any later version.
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*
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* GNU Mes is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with GNU Mes. If not, see <http://www.gnu.org/licenses/>.
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*/
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#if SYSTEM_LIBC
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#error "SYSTEM_LIBC not supported"
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#endif
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#include <mes/lib.h>
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#include <fcntl.h>
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#include <stdio.h>
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#include <stdlib.h>
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char arena[300];
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typedef int SCM;
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SCM g_stack = 0;
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SCM r0 = 0; // a/env
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SCM r1 = 0; // param 1
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SCM r2 = 0; // save 2+load/dump
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SCM r3 = 0; // continuation
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enum type_t
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{ TCHAR, TCLOSURE, TCONTINUATION, TFUNCTION, TKEYWORD, TMACRO, TNUMBER, TPAIR, TREF, TSPECIAL, TSTRING,
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TSYMBOL, TVALUES, TVECTOR, TBROKEN_HEART };
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struct scm
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{
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enum type_t type;
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SCM car;
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SCM cdr;
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};
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#if __MESC__
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struct scm *g_cells = arena;
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#else
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struct scm *g_cells = (struct scm *) arena;
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#endif
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#define cell_nil 1
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#define cell_f 2
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#define cell_t 3
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#define TYPE(x) (g_cells[x].type)
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#define CAR(x) g_cells[x].car
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#define CDR(x) g_cells[x].cdr
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#define VALUE(x) g_cells[x].cdr
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SCM
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car (SCM x)
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{
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return CAR (x);
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}
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SCM
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cdr (SCM x)
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{
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return CDR (x);
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}
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SCM
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caar (SCM x)
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{
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return car (car (x));
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}
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SCM
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cadr (SCM x)
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{
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return car (cdr (x));
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}
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SCM
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cdar (SCM x)
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{
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return cdr (car (x));
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}
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SCM
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cddr (SCM x)
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{
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return cdr (cdr (x));
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}
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SCM
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gc_peek_frame ()
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{
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SCM frame = car (g_stack);
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r1 = car (frame);
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r2 = cadr (frame);
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r3 = car (cddr (frame));
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r0 = cadr (cddr (frame));
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return frame;
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}
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// Environment setup
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SCM
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mes_environment ()
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{
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return 0;
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}
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SCM
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mes_builtins (SCM a)
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{
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return a;
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}
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SCM
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fill ()
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{
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TYPE (0) = 0x6c6c6168;
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CAR (0) = 0x6a746f6f;
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CDR (0) = 0x00002165;
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TYPE (1) = TSYMBOL;
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CAR (1) = 0x2d2d2d2d;
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CDR (1) = 0x3e3e3e3e;
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TYPE (9) = 0x2d2d2d2d;
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CAR (9) = 0x2d2d2d2d;
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CDR (9) = 0x3e3e3e3e;
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// (A(B))
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TYPE (10) = TPAIR;
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CAR (10) = 11;
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CDR (10) = 12;
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TYPE (11) = TCHAR;
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CAR (11) = 0x58585858;
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CDR (11) = 89;
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TYPE (12) = TPAIR;
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CAR (12) = 13;
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CDR (12) = 1;
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TYPE (13) = TCHAR;
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CAR (11) = 0x58585858;
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CDR (13) = 90;
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TYPE (14) = 0x58585858;
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CAR (14) = 0x58585858;
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CDR (14) = 0x58585858;
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TYPE (14) = 0x58585858;
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CAR (14) = 0x58585858;
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CDR (14) = 0x58585858;
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TYPE (16) = 0x3c3c3c3c;
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CAR (16) = 0x2d2d2d2d;
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CDR (16) = 0x2d2d2d2d;
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return 0;
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}
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SCM
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display_ (SCM x)
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{
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//puts ("<display>\n");
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switch (TYPE (x))
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{
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case TCHAR:
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{
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//puts ("<char>\n");
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puts ("#\\");
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putchar (VALUE (x));
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break;
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}
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case TFUNCTION:
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{
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//puts ("<function>\n");
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if (VALUE (x) == 0)
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puts ("core:make-cell");
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if (VALUE (x) == 1)
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puts ("cons");
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if (VALUE (x) == 2)
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puts ("car");
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if (VALUE (x) == 3)
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puts ("cdr");
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break;
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}
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case TNUMBER:
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{
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//puts ("<number>\n");
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#if __GNUC__
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puts (itoa (VALUE (x)));
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#else
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int i;
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i = VALUE (x);
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i = i + 48;
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putchar (i);
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#endif
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break;
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}
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case TPAIR:
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{
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//puts ("<pair>\n");
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//if (cont != cell_f) puts "(");
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puts ("(");
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if (x && x != cell_nil)
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display_ (CAR (x));
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if (CDR (x) && CDR (x) != cell_nil)
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{
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#if __GNUC__
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if (TYPE (CDR (x)) != TPAIR)
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puts (" . ");
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#else
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int c;
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c = CDR (x);
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c = TYPE (c);
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if (c != TPAIR)
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puts (" . ");
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#endif
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display_ (CDR (x));
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}
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//if (cont != cell_f) puts (")");
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puts (")");
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break;
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}
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case TSPECIAL:
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{
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switch (x)
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{
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case 1:
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{
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puts ("()");
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break;
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}
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case 2:
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{
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puts ("#f");
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break;
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}
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case 3:
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{
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puts ("#t");
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break;
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}
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default:
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{
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#if __GNUC__
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puts ("<x:");
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puts (itoa (x));
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puts (">");
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#else
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puts ("<x>");
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#endif
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}
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}
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break;
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}
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case TSYMBOL:
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{
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switch (x)
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{
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case 11:
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{
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puts (" . ");
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break;
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}
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case 12:
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{
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puts ("lambda");
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break;
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}
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case 13:
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{
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puts ("begin");
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break;
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}
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case 14:
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{
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puts ("if");
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break;
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}
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case 15:
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{
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puts ("quote");
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break;
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}
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case 37:
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{
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puts ("car");
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break;
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}
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case 38:
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{
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puts ("cdr");
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break;
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}
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case 39:
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{
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puts ("null?");
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break;
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}
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case 40:
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{
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puts ("eq?");
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break;
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}
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case 41:
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{
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puts ("cons");
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break;
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}
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default:
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{
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#if __GNUC__
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puts ("<s:");
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puts (itoa (x));
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puts (">");
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#else
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puts ("<s>");
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#endif
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}
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}
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break;
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}
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default:
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{
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//puts ("<default>\n");
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#if __GNUC__
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puts ("<");
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puts (itoa (TYPE (x)));
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puts (":");
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puts (itoa (x));
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puts (">");
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#else
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puts ("_");
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#endif
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break;
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}
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}
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return 0;
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}
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SCM
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bload_env (SCM a) ///((internal))
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{
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puts ("reading: ");
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char *mo = "module/mes/tiny-0-32.mo";
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puts (mo);
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puts ("\n");
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__stdin = open (mo, 0);
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if (__stdin < 0)
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{
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eputs ("no such file: module/mes/tiny-0-32.mo\n");
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return 1;
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}
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// BOOM
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//char *p = arena;
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char *p = (char *) g_cells;
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int c;
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c = getchar ();
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putchar (c);
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if (c != 'M')
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exit (10);
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c = getchar ();
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putchar (c);
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if (c != 'E')
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exit (11);
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c = getchar ();
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putchar (c);
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if (c != 'S')
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exit (12);
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puts (" *GOT MES*\n");
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// skip stack
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getchar ();
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getchar ();
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int i = 0;
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c = getchar ();
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while (c != -1)
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{
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i++;
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eputs (itoa (i));
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eputs (": ");
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eputs (itoa (c));
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eputs ("\n");
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*p++ = c;
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c = getchar ();
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}
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puts ("read done\n");
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display_ (10);
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puts ("\n");
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return r2;
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}
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int
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main (int argc, char *argv[])
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{
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fill ();
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char *p = arena;
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puts (p);
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puts ("\n");
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display_ (10);
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puts ("\n");
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SCM program = bload_env (r0);
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return 0;
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}
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