File:  [gforth] / gforth / Attic / main.c
Revision 1.15: download - view: text, annotated - select for diffs
Mon Oct 24 19:16:02 1994 UTC (29 years, 5 months ago) by anton
Branches: MAIN
CVS tags: HEAD
Added automatic glossary entry transfer from primitives to the texi file.
renamed gfoprth.texi to gforth.ds.
fixed a few minor bugs.
changed the behaviour of locals scoping when encountering an unreachable BEGIN.
made UNREACHABLE immediate

/*
  $Id: main.c,v 1.15 1994/10/24 19:16:02 anton 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"
#ifdef USE_GETOPT
#  include "getopt.h"
#else
     extern int getopt (int argc, char *argv[], char *optstring);

     extern char *optarg;
     extern int optind, opterr;
#endif

#ifndef DEFAULTPATH
#	define DEFAULTPATH "/usr/local/lib/gforth:."
#endif

#ifdef DIRECT_THREADED
#	define CA(n)	(symbols[(n)])
#else
#	define CA(n)	((int)(symbols+(n)))
#endif

#define maxaligned(n)	((((Cell)n)+sizeof(Float)-1)&-sizeof(Float))

static int dictsize=0;
static int dsize=0;
static int rsize=0;
static int fsize=0;
static int lsize=0;
char *progname;


/* image file format:
 *   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)
 *   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]+((int)image));
		                   break;
		case CF(DOESJUMP): MAKE_DOES_HANDLER(image+i); break;
		default          : image[i]=(Cell)CA(CF(image[i]));
	     }
         else
           image[i]+=(Cell)image;

   CACHE_FLUSH(image,size);
}

Cell *loader(FILE *imagefile)
{
	Cell header[3];
	Cell *image;
	int wholesize;
	int imagesize; /* everything needed by the image */

	fread(header,1,3*sizeof(Cell),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);

	relocate(image,(char *)image+header[1],header[1],engine(0,0,0,0,0));

	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 *)(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;
#ifdef USE_GETOPT
	  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, "+mdrfl", opts, &option_index);
#else
	  c = getopt(argc, argv, "imdrflp");
#endif

	  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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