mes/scaffold/micro-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/>.
*/
#define MES_MINI 1
#if __GNUC__
#define __NYACC__ 0
#define NYACC
#define NYACC2
#else
#define __NYACC__ 1
#define NYACC nyacc
#define NYACC2 nyacc2
#endif
#if __GNUC__
typedef long size_t;
void *malloc (size_t i);
int open (char const *s, int mode);
int read (int fd, int n);
void write (int fd, char const* s, int n);
void
exit (int code)
{
asm (
"movl %0,%%ebx\n\t"
"movl $1,%%eax\n\t"
"int $0x80"
: // no outputs "=" (r)
: "" (code)
);
// not reached
exit (0);
}
char const*
getenv (char const* p)
{
return 0;
}
int
open (char const *s, int mode)
{
//return syscall (SYS_open, s, mode);
return 0;
}
int
read (int fd, int n)
{
//syscall (SYS_read, 1, 1);
return 0;
}
void
write (int fd, char const* s, int n)
{
int r;
//syscall (SYS_write, fd, s, n));
asm (
"mov %0,%%ebx\n\t"
"mov %1,%%ecx\n\t"
"mov %2,%%edx\n\t"
"mov $0x4, %%eax\n\t"
"int $0x80\n\t"
: // no outputs "=" (r)
: "" (fd), "" (s), "" (n)
: "eax", "ebx", "ecx", "edx"
);
}
void *
malloc (size_t size)
{
int *n;
int len = size + sizeof (size);
//n = mmap (0, len, PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_ANONYMOUS, 0, 0 );
*n = len;
return (void*)(n+1);
}
void
free (void *p)
{
int *n = (int*)p-1;
//munmap ((void*)p, *n);
}
#define EOF -1
#define STDIN 0
#define STDOUT 1
#define STDERR 2
//#include <stdio.h>
//#include <string.h>
//#include <stdlib.h>
int g_stdin;
size_t
strlen (char const* s)
{
int i = 0;
while (s[i]) i++;
return i;
}
int
strcmp (char const* a, char const* b)
{
while (*a && *b && *a == *b) {a++;b++;}
return *a - *b;
}
int
getc ()
{
return read (g_stdin, 1);
}
int
puts (char const* s)
{
//write (STDOUT, s, strlen (s));
//int i = write (STDOUT, s, strlen (s));
int i = strlen (s);
write (1, s, i);
return 0;
}
int
eputs (char const* s)
{
//write (STDERR, s, strlen (s));
//int i = write (STDERR, s, strlen (s));
int i = strlen (s);
write (2, s, i);
return 0;
}
char const*
itoa (int x)
{
static char buf[10];
char *p = buf+9;
*p-- = 0;
int sign = x < 0;
if (sign)
x = -x;
do
{
*p-- = '0' + (x % 10);
x = x / 10;
} while (x);
if (sign)
*p-- = '-';
return p+1;
}
void
assert_fail (char* s)
{
eputs ("assert fail:");
eputs (s);
eputs ("\n");
*((int*)0) = 0;
}
#endif
#define assert(x) ((x) ? (void)0 : assert_fail(#x))
typedef int SCM;
#if __GNUC__
int g_debug = 0;
#endif
int g_free = 0;
SCM g_symbols = 0;
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
SCM
mes_environment ()
{
return 0;
}
SCM
bload_env (SCM a) ///((internal))
{
eputs ("bload_env\n");
return 0;
}
int
main (int argc, char *argv[])
{
#if __GNUC__
g_debug = (int)getenv ("MES_DEBUG");
#endif
//if (getenv ("MES_ARENA")) ARENA_SIZE = atoi (getenv ("MES_ARENA"));
if (argc > 1 && !strcmp (argv[1], "--help")) return eputs ("Usage: mes [--dump|--load] < FILE\n");
if (argc > 1 && !strcmp (argv[1], "--version")) {eputs ("Mes ");eputs (VERSION);return eputs ("\n");};
#if __GNUC__
g_stdin = STDIN;
r0 = mes_environment ();
#endif
#if MES_MINI
puts ("Hello micro-mes!\n");
SCM program = bload_env (r0);
#else
SCM program = (argc > 1 && !strcmp (argv[1], "--load"))
? bload_env (r0) : load_env (r0);
if (argc > 1 && !strcmp (argv[1], "--dump")) return dump ();
push_cc (r2, cell_unspecified, r0, cell_unspecified);
r3 = cell_vm_begin;
r1 = eval_apply ();
stderr_ (r1);
eputs ("\n");
gc (g_stack);
#endif
int i = argc;
//int i = strcmp (argv[1], "1");
return i;
#if __GNUC__
if (g_debug)
{
eputs ("\nstats: [");
eputs (itoa (g_free));
eputs ("]\n");
}
#endif
return 0;
}
#if __GNUC__
void
_start ()
{
int r;
asm (
"mov %%ebp,%%eax\n\t"
"addl $8,%%eax\n\t"
"push %%eax\n\t"
"mov %%ebp,%%eax\n\t"
"addl $4,%%eax\n\t"
"movzbl (%%eax),%%eax\n\t"
"push %%eax\n\t"
"call main\n\t"
"movl %%eax,%0\n\t"
: "=r" (r)
: //no inputs "" (&main)
);
exit (r);
}
#endif