mes/scaffold/tiny-mes.c

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