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main.c
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1.22:
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Thu Feb 2 18:13:06 1995 UTC (29 years, 2 months ago) by
pazsan
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MAIN
CVS tags:
HEAD
added very preliminary support for Alpha/osf1
Moved flush-tos before stores to improve scheduling
merged io-dos.h and io.h
Created new Makefile for DOS
removed ToDo topcics that are already done
/*
$Id: main.c,v 1.22 1995/02/02 18:13:06 pazsan Exp $
Copyright 1993 by the ANSI figForth Development Group
*/
#include <ctype.h>
#include <stdio.h>
#include <string.h>
#include <math.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <assert.h>
#include <stdlib.h>
#include "forth.h"
#include "io.h"
#include "getopt.h"
#ifdef MSDOS
jmp_buf throw_jmp_buf;
#endif
#ifndef DEFAULTPATH
# define DEFAULTPATH "/usr/local/lib/gforth:."
#endif
#ifdef DIRECT_THREADED
# define CA(n) (symbols[(n)])
#else
# define CA(n) ((Cell)(symbols+(n)))
#endif
#define maxaligned(n) ((((Cell)n)+sizeof(Float)-1)&-sizeof(Float))
static Cell dictsize=0;
static Cell dsize=0;
static Cell rsize=0;
static Cell fsize=0;
static Cell lsize=0;
char *progname;
/* image file format:
* preamble (is skipped off), size multiple of 8
* magig: "gforth00" (means format version 0.0)
* size of image with stacks without tags (in bytes)
* size of image without stacks and tags (in bytes)
* size of data and FP stack (in bytes)
* pointer to start of code
* pointer into throw (for signal handling)
* pointer to dictionary
* data (size in image[1])
* tags (1 bit/data cell)
*
* tag==1 mean that the corresponding word is an address;
* If the word is >=0, the address is within the image;
* addresses within the image are given relative to the start of the image.
* If the word is =-1, the address is NIL,
* If the word is between -2 and -5, it's a CFA (:, Create, Constant, User)
* If the word is -6, it's a DOES> CFA
* If the word is -7, it's a DOES JUMP
* If the word is <-7, it's a primitive
*/
void relocate(Cell *image, char *bitstring, int size, Label symbols[])
{
int i=0, j, k, steps=(size/sizeof(Cell))/8;
char bits;
/* static char bits[8]={0x80,0x40,0x20,0x10,0x08,0x04,0x02,0x01};*/
for(k=0; k<=steps; k++)
for(j=0, bits=bitstring[k]; j<8; j++, i++, bits<<=1)
if(bits & 0x80)
if(image[i]<0)
switch(image[i])
{
case CF_NIL : image[i]=0; break;
case CF(DOCOL) :
case CF(DOVAR) :
case CF(DOCON) :
case CF(DOUSER) :
case CF(DODEFER) : MAKE_CF(image+i,symbols[CF(image[i])]); break;
case CF(DODOES) : MAKE_DOES_CF(image+i,image[i+1]+((Cell)image));
break;
case CF(DOESJUMP): MAKE_DOES_HANDLER(image+i); break;
default : image[i]=(Cell)CA(CF(image[i]));
}
else
image[i]+=(Cell)image;
}
Cell *loader(FILE *imagefile)
{
Cell header[3];
Cell *image;
Char magic[8];
int wholesize;
int imagesize; /* everything needed by the image */
do
{
if(fread(magic,sizeof(Char),8,imagefile) < 8) {
fprintf(stderr,"This file doesn't seem to be a gforth image\n");
exit(1);
}
#ifdef DEBUG
printf("Magic found: %s\n",magic);
#endif
}
while(memcmp(magic,"gforth00",8));
fread(header,sizeof(Cell),3,imagefile);
if (dictsize==0)
dictsize = header[0];
if (dsize==0)
dsize=header[2];
if (rsize==0)
rsize=header[2];
if (fsize==0)
fsize=header[2];
if (lsize==0)
lsize=header[2];
dictsize=maxaligned(dictsize);
dsize=maxaligned(dsize);
rsize=maxaligned(rsize);
lsize=maxaligned(lsize);
fsize=maxaligned(fsize);
wholesize = dictsize+dsize+rsize+fsize+lsize;
imagesize = header[1]+((header[1]-1)/sizeof(Cell))/8+1;
image=malloc(wholesize>imagesize?wholesize:imagesize);
memset(image,0,wholesize); /* why? - anton */
image[0]=header[0];
image[1]=header[1];
image[2]=header[2];
fread(image+3,1,header[1]-3*sizeof(Cell),imagefile);
fread(((void *)image)+header[1],1,((header[1]-1)/sizeof(Cell))/8+1,
imagefile);
fclose(imagefile);
if(image[5]==0) {
relocate(image,(char *)image+header[1],header[1],engine(0,0,0,0,0));
}
else if(image[5]!=(Cell)image) {
fprintf(stderr,"Corrupted image address, please recompile image\n");
exit(1);
}
CACHE_FLUSH(image,image[1]);
return(image);
}
int go_forth(Cell *image, int stack, Cell *entries)
{
Cell *sp=(Cell*)((void *)image+dictsize+dsize);
Address lp=(Address)((void *)sp+lsize);
Float *fp=(Float *)((void *)lp+fsize);
Cell *rp=(Cell*)((void *)fp+rsize);
Xt *ip=(Xt *)((Cell)image[3]);
int throw_code;
for(;stack>0;stack--)
*--sp=entries[stack-1];
install_signal_handlers(); /* right place? */
if ((throw_code=setjmp(throw_jmp_buf))) {
static Cell signal_data_stack[8];
static Cell signal_return_stack[8];
static Float signal_fp_stack[1];
signal_data_stack[7]=throw_code;
return((int)engine((Xt *)image[4],signal_data_stack+7,
signal_return_stack+8,signal_fp_stack,0));
}
return((int)engine(ip,sp,rp,fp,lp));
}
int convsize(char *s, int elemsize)
/* converts s of the format #+u (e.g. 25k) into the number of bytes.
the unit u can be one of bekM, where e stands for the element
size. default is e */
{
char *endp;
int n,m;
m = elemsize;
n = strtoul(s,&endp,0);
if (endp!=NULL) {
if (strcmp(endp,"b")==0)
m=1;
else if (strcmp(endp,"k")==0)
m=1024;
else if (strcmp(endp,"M")==0)
m=1024*1024;
else if (strcmp(endp,"e")!=0) {
fprintf(stderr,"%s: cannot grok size specification %s\n", progname, s);
exit(1);
}
}
return n*m;
}
int main(int argc, char **argv, char **env)
{
char *path, *path1;
char *imagename="gforth.fi";
FILE *image_file;
int c, retvalue;
#if defined(i386) && defined(ALIGNMENT_CHECK) && !defined(DIRECT_THREADED)
/* turn on alignment checks on the 486.
* on the 386 this should have no effect. */
__asm__("pushfl; popl %eax; orl $0x40000, %eax; pushl %eax; popfl;");
#endif
progname = argv[0];
if ((path=getenv("GFORTHPATH"))==NULL)
path = strcpy(malloc(strlen(DEFAULTPATH)+1),DEFAULTPATH);
opterr=0;
while (1) {
int option_index=0;
static struct option opts[] = {
{"image-file", required_argument, NULL, 'i'},
{"dictionary-size", required_argument, NULL, 'm'},
{"data-stack-size", required_argument, NULL, 'd'},
{"return-stack-size", required_argument, NULL, 'r'},
{"fp-stack-size", required_argument, NULL, 'f'},
{"locals-stack-size", required_argument, NULL, 'l'},
{"path", required_argument, NULL, 'p'},
{0,0,0,0}
/* no-init-file, no-rc? */
};
c = getopt_long(argc, argv, "+i:m:d:r:f:l:p:", opts, &option_index);
if (c==EOF)
break;
if (c=='?') {
optind--;
break;
}
switch (c) {
case 'i': imagename = optarg; break;
case 'm': dictsize = convsize(optarg,sizeof(Cell)); break;
case 'd': dsize = convsize(optarg,sizeof(Cell)); break;
case 'r': rsize = convsize(optarg,sizeof(Cell)); break;
case 'f': fsize = convsize(optarg,sizeof(Float)); break;
case 'l': lsize = convsize(optarg,sizeof(Cell)); break;
case 'p': path = optarg; break;
}
}
path1=path;
do {
char *pend=strchr(path, ':');
if (pend==NULL)
pend=path+strlen(path);
if (strlen(path)==0) {
fprintf(stderr,"%s: cannot open image file %s in path %s for reading\n",
progname, imagename, path1);
exit(1);
}
{
int dirlen=pend-path;
char fullfilename[dirlen+strlen(imagename)+2];
memcpy(fullfilename, path, dirlen);
if (fullfilename[dirlen-1]!='/')
fullfilename[dirlen++]='/';
strcpy(fullfilename+dirlen,imagename);
image_file=fopen(fullfilename,"rb");
}
path=pend+(*pend==':');
} while (image_file==NULL);
{
Cell environ[]= {
(Cell)argc-(optind-1),
(Cell)(argv+(optind-1)),
(Cell)path1};
argv[optind-1] = progname;
/*
for (i=0; i<environ[0]; i++)
printf("%s\n", ((char **)(environ[1]))[i]);
*/
retvalue=go_forth(loader(image_file),3,environ);
deprep_terminal();
exit(retvalue);
}
}
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