File:  [gforth] / gforth / engine / main.c
Revision 1.15: download - view: text, annotated - select for diffs
Tue Dec 22 15:19:03 1998 UTC (23 years, 11 months ago) by pazsan
Branches: MAIN
CVS tags: HEAD
Changed format to Gforth2x (0.4 or greater)

    1: /* command line interpretation, image loading etc. for Gforth
    2: 
    3: 
    4:   Copyright (C) 1995,1996,1997,1998 Free Software Foundation, Inc.
    5: 
    6:   This file is part of Gforth.
    7: 
    8:   Gforth is free software; you can redistribute it and/or
    9:   modify it under the terms of the GNU General Public License
   10:   as published by the Free Software Foundation; either version 2
   11:   of the License, or (at your option) any later version.
   12: 
   13:   This program is distributed in the hope that it will be useful,
   14:   but WITHOUT ANY WARRANTY; without even the implied warranty of
   15:   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   16:   GNU General Public License for more details.
   17: 
   18:   You should have received a copy of the GNU General Public License
   19:   along with this program; if not, write to the Free Software
   20:   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
   21: */
   22: 
   23: #include "config.h"
   24: #include <errno.h>
   25: #include <ctype.h>
   26: #include <stdio.h>
   27: #include <unistd.h>
   28: #include <string.h>
   29: #include <math.h>
   30: #include <sys/types.h>
   31: #include <sys/stat.h>
   32: #include <fcntl.h>
   33: #include <assert.h>
   34: #include <stdlib.h>
   35: #ifndef STANDALONE
   36: #if HAVE_SYS_MMAN_H
   37: #include <sys/mman.h>
   38: #endif
   39: #endif
   40: #include "forth.h"
   41: #include "io.h"
   42: #include "getopt.h"
   43: #ifdef STANDALONE
   44: #include <systypes.h>
   45: #endif
   46: 
   47: #define PRIM_VERSION 1
   48: /* increment this whenever the primitives change in an incompatible way */
   49: 
   50: #ifndef DEFAULTPATH
   51: #  define DEFAULTPATH "."
   52: #endif
   53: 
   54: #ifdef MSDOS
   55: jmp_buf throw_jmp_buf;
   56: #endif
   57: 
   58: #if defined(DIRECT_THREADED) 
   59: #  define CA(n)	(symbols[(n)])
   60: #else
   61: #  define CA(n)	((Cell)(symbols+(n)))
   62: #endif
   63: 
   64: #define maxaligned(n)	(typeof(n))((((Cell)n)+sizeof(Float)-1)&-sizeof(Float))
   65: 
   66: static UCell dictsize=0;
   67: static UCell dsize=0;
   68: static UCell rsize=0;
   69: static UCell fsize=0;
   70: static UCell lsize=0;
   71: int offset_image=0;
   72: int die_on_signal=0;
   73: #ifndef INCLUDE_IMAGE
   74: static int clear_dictionary=0;
   75: static size_t pagesize=0;
   76: #endif
   77: static int debug=0;
   78: char *progname;
   79: 
   80: /* image file format:
   81:  *  "#! binary-path -i\n" (e.g., "#! /usr/local/bin/gforth-0.4.0 -i\n")
   82:  *   padding to a multiple of 8
   83:  *   magic: "Gforth2x" means format 0.4,
   84:  *              where x is a byte with
   85:  *              bit 7:   reserved = 0
   86:  *              bit 6:5: address unit size 2^n octets
   87:  *              bit 4:3: character size 2^n octets
   88:  *              bit 2:1: cell size 2^n octets
   89:  *              bit 0:   endian, big=0, little=1.
   90:  *  The magic are always 8 octets, no matter what the native AU/character size is
   91:  *  padding to max alignment (no padding necessary on current machines)
   92:  *  ImageHeader structure (see below)
   93:  *  data (size in ImageHeader.image_size)
   94:  *  tags ((if relocatable, 1 bit/data cell)
   95:  *
   96:  * tag==1 means that the corresponding word is an address;
   97:  * If the word is >=0, the address is within the image;
   98:  * addresses within the image are given relative to the start of the image.
   99:  * If the word =-1 (CF_NIL), the address is NIL,
  100:  * If the word is <CF_NIL and >CF(DODOES), it's a CFA (:, Create, ...)
  101:  * If the word =CF(DODOES), it's a DOES> CFA
  102:  * If the word =CF(DOESJUMP), it's a DOES JUMP (2 Cells after DOES>,
  103:  *					possibly containing a jump to dodoes)
  104:  * If the word is <CF(DOESJUMP), it's a primitive
  105:  */
  106: 
  107: typedef struct {
  108:   Address base;		/* base address of image (0 if relocatable) */
  109:   UCell checksum;	/* checksum of ca's to protect against some
  110: 			   incompatible	binary/executable combinations
  111: 			   (0 if relocatable) */
  112:   UCell image_size;	/* all sizes in bytes */
  113:   UCell dict_size;
  114:   UCell data_stack_size;
  115:   UCell fp_stack_size;
  116:   UCell return_stack_size;
  117:   UCell locals_stack_size;
  118:   Xt *boot_entry;	/* initial ip for booting (in BOOT) */
  119:   Xt *throw_entry;	/* ip after signal (in THROW) */
  120:   Cell unused1;		/* possibly tib stack size */
  121:   Cell unused2;
  122:   Address data_stack_base; /* this and the following fields are initialized by the loader */
  123:   Address fp_stack_base;
  124:   Address return_stack_base;
  125:   Address locals_stack_base;
  126: } ImageHeader;
  127: /* the image-header is created in main.fs */
  128: 
  129: void relocate(Cell *image, const char *bitstring, int size, Label symbols[])
  130: {
  131:   int i=0, j, k, steps=(size/sizeof(Cell))/8;
  132:   Cell token;
  133:   char bits;
  134: /*   static char bits[8]={0x80,0x40,0x20,0x10,0x08,0x04,0x02,0x01};*/
  135: 
  136: /*  printf("relocating %x[%x]\n", image, size); */
  137:    
  138:   for(k=0; k<=steps; k++)
  139:     for(j=0, bits=bitstring[k]; j<RELINFOBITS; j++, i++, bits<<=1) {
  140:       /*      fprintf(stderr,"relocate: image[%d]\n", i);*/
  141:       if(bits & (1U << (RELINFOBITS-1))) {
  142: 	/* fprintf(stderr,"relocate: image[%d]=%d\n", i, image[i]);*/
  143: 	if((token=image[i])<0)
  144: 	  switch(token)
  145: 	    {
  146: 	    case CF_NIL      : image[i]=0; break;
  147: #if !defined(DOUBLY_INDIRECT)
  148: 	    case CF(DOCOL)   :
  149: 	    case CF(DOVAR)   :
  150: 	    case CF(DOCON)   :
  151: 	    case CF(DOUSER)  : 
  152: 	    case CF(DODEFER) : 
  153: 	    case CF(DOFIELD) : MAKE_CF(image+i,symbols[CF(token)]); break;
  154: 	    case CF(DOESJUMP): MAKE_DOES_HANDLER(image+i); break;
  155: #endif /* !defined(DOUBLY_INDIRECT) */
  156: 	    case CF(DODOES)  :
  157: 	      MAKE_DOES_CF(image+i,image[i+1]+((Cell)image));
  158: 	      break;
  159: 	    default          :
  160: /*	      printf("Code field generation image[%x]:=CA(%x)\n",
  161: 		     i, CF(image[i])); */
  162: 	      image[i]=(Cell)CA(CF(token));
  163: 	    }
  164: 	else
  165: 	  image[i]+=(Cell)image;
  166:       }
  167:     }
  168: }
  169: 
  170: UCell checksum(Label symbols[])
  171: {
  172:   UCell r=PRIM_VERSION;
  173:   Cell i;
  174: 
  175:   for (i=DOCOL; i<=DOESJUMP; i++) {
  176:     r ^= (UCell)(symbols[i]);
  177:     r = (r << 5) | (r >> (8*sizeof(Cell)-5));
  178:   }
  179: #ifdef DIRECT_THREADED
  180:   /* we have to consider all the primitives */
  181:   for (; symbols[i]!=(Label)0; i++) {
  182:     r ^= (UCell)(symbols[i]);
  183:     r = (r << 5) | (r >> (8*sizeof(Cell)-5));
  184:   }
  185: #else
  186:   /* in indirect threaded code all primitives are accessed through the
  187:      symbols table, so we just have to put the base address of symbols
  188:      in the checksum */
  189:   r ^= (UCell)symbols;
  190: #endif
  191:   return r;
  192: }
  193: 
  194: Address verbose_malloc(Cell size)
  195: {
  196:   Address r;
  197:   /* leave a little room (64B) for stack underflows */
  198:   if ((r = malloc(size+64))==NULL) {
  199:     perror(progname);
  200:     exit(1);
  201:   }
  202:   r = (Address)((((Cell)r)+(sizeof(Float)-1))&(-sizeof(Float)));
  203:   if (debug)
  204:     fprintf(stderr, "malloc succeeds, address=$%lx\n", (long)r);
  205:   return r;
  206: }
  207: 
  208: Address my_alloc(Cell size)
  209: {
  210: #if HAVE_MMAP
  211:   static Address next_address=0;
  212:   Address r;
  213: 
  214: #if defined(MAP_ANON)
  215:   if (debug)
  216:     fprintf(stderr,"try mmap($%lx, $%lx, ..., MAP_ANON, ...); ", (long)next_address, (long)size);
  217:   r=mmap(next_address, size, PROT_EXEC|PROT_READ|PROT_WRITE, MAP_ANON|MAP_PRIVATE, -1, 0);
  218: #else /* !defined(MAP_ANON) */
  219:   /* Ultrix (at least does not define MAP_FILE and MAP_PRIVATE (both are
  220:      apparently defaults*/
  221: #ifndef MAP_FILE
  222: # define MAP_FILE 0
  223: #endif
  224: #ifndef MAP_PRIVATE
  225: # define MAP_PRIVATE 0
  226: #endif
  227:   static int dev_zero=-1;
  228: 
  229:   if (dev_zero == -1)
  230:     dev_zero = open("/dev/zero", O_RDONLY);
  231:   if (dev_zero == -1) {
  232:     r = (Address)-1;
  233:     if (debug)
  234:       fprintf(stderr, "open(\"/dev/zero\"...) failed (%s), no mmap; ", 
  235: 	      strerror(errno));
  236:   } else {
  237:     if (debug)
  238:       fprintf(stderr,"try mmap($%lx, $%lx, ..., MAP_FILE, dev_zero, ...); ", (long)next_address, (long)size);
  239:     r=mmap(next_address, size, PROT_EXEC|PROT_READ|PROT_WRITE, MAP_FILE|MAP_PRIVATE, dev_zero, 0);
  240:   }
  241: #endif /* !defined(MAP_ANON) */
  242: 
  243:   if (r != (Address)-1) {
  244:     if (debug)
  245:       fprintf(stderr, "success, address=$%lx\n", (long) r);
  246:     if (pagesize != 0)
  247:       next_address = (Address)(((((Cell)r)+size-1)&-pagesize)+2*pagesize); /* leave one page unmapped */
  248:     return r;
  249:   }
  250:   if (debug)
  251:     fprintf(stderr, "failed: %s\n", strerror(errno));
  252: #endif /* HAVE_MMAP */
  253:   /* use malloc as fallback */
  254:   return verbose_malloc(size);
  255: }
  256: 
  257: #if (defined(mips) && !defined(INDIRECT_THREADED))
  258: /* the 256MB jump restriction on the MIPS architecture makes the
  259:    combination of direct threading and mmap unsafe. */
  260: #define dict_alloc(size) verbose_malloc(size)
  261: #else
  262: #define dict_alloc(size) my_alloc(size)
  263: #endif
  264: 
  265: void set_stack_sizes(ImageHeader * header)
  266: {
  267:   if (dictsize==0)
  268:     dictsize = header->dict_size;
  269:   if (dsize==0)
  270:     dsize = header->data_stack_size;
  271:   if (rsize==0)
  272:     rsize = header->return_stack_size;
  273:   if (fsize==0)
  274:     fsize = header->fp_stack_size;
  275:   if (lsize==0)
  276:     lsize = header->locals_stack_size;
  277:   dictsize=maxaligned(dictsize);
  278:   dsize=maxaligned(dsize);
  279:   rsize=maxaligned(rsize);
  280:   lsize=maxaligned(lsize);
  281:   fsize=maxaligned(fsize);
  282: }
  283: 
  284: void alloc_stacks(ImageHeader * header)
  285: {
  286:   header->dict_size=dictsize;
  287:   header->data_stack_size=dsize;
  288:   header->fp_stack_size=fsize;
  289:   header->return_stack_size=rsize;
  290:   header->locals_stack_size=lsize;
  291: 
  292:   header->data_stack_base=my_alloc(dsize);
  293:   header->fp_stack_base=my_alloc(fsize);
  294:   header->return_stack_base=my_alloc(rsize);
  295:   header->locals_stack_base=my_alloc(lsize);
  296: }
  297: 
  298: int go_forth(Address image, int stack, Cell *entries)
  299: {
  300:   Cell *sp=(Cell*)(((ImageHeader *)image)->data_stack_base + dsize);
  301:   Float *fp=(Float *)(((ImageHeader *)image)->fp_stack_base + fsize);
  302:   Cell *rp=(Cell *)(((ImageHeader *)image)->return_stack_base + rsize);
  303:   Address lp=((ImageHeader *)image)->locals_stack_base + lsize;
  304:   Xt *ip=(Xt *)(((ImageHeader *)image)->boot_entry);
  305: #ifdef SYSSIGNALS
  306:   int throw_code;
  307: #endif
  308: 
  309:   /* ensure that the cached elements (if any) are accessible */
  310:   IF_TOS(sp--);
  311:   IF_FTOS(fp--);
  312:   
  313:   for(;stack>0;stack--)
  314:     *--sp=entries[stack-1];
  315: 
  316: #if !defined(MSDOS) && !defined(SHARC) && !defined(_WIN32) && !defined(__EMX__)
  317:   get_winsize();
  318: #endif
  319:    
  320: #ifdef SYSSIGNALS
  321:   install_signal_handlers(); /* right place? */
  322:   
  323:   if ((throw_code=setjmp(throw_jmp_buf))) {
  324:     static Cell signal_data_stack[8];
  325:     static Cell signal_return_stack[8];
  326:     static Float signal_fp_stack[1];
  327: 
  328:     signal_data_stack[7]=throw_code;
  329:     
  330:     return((int)engine(((ImageHeader *)image)->throw_entry,signal_data_stack+7,
  331: 		       signal_return_stack+8,signal_fp_stack,0));
  332:   }
  333: #endif
  334: 
  335:   return((int)engine(ip,sp,rp,fp,lp));
  336: }
  337: 
  338: #ifndef INCLUDE_IMAGE
  339: Address loader(FILE *imagefile, char* filename)
  340: /* returns the address of the image proper (after the preamble) */
  341: {
  342:   ImageHeader header;
  343:   Address image;
  344:   Address imp; /* image+preamble */
  345:   Char magic[9];
  346:   Cell preamblesize=0;
  347:   Label *symbols = engine(0,0,0,0,0);
  348:   Cell data_offset = offset_image ? 56*sizeof(Cell) : 0;
  349:   UCell check_sum;
  350:   static char* endianstring[]= { "big","little" };
  351:   Cell ausize = ((RELINFOBITS ==  8) ? 0 :
  352: 		 (RELINFOBITS == 16) ? 1 :
  353: 		 (RELINFOBITS == 32) ? 2 : 3);
  354:   Cell charsize = ((sizeof(Char) == 1) ? 0 :
  355: 		   (sizeof(Char) == 2) ? 1 :
  356: 		   (sizeof(Char) == 4) ? 2 : 3) + ausize;
  357:   Cell cellsize = ((sizeof(Cell) == 1) ? 0 :
  358: 		   (sizeof(Cell) == 2) ? 1 :
  359: 		   (sizeof(Cell) == 4) ? 2 : 3) + ausize;
  360: 
  361: #ifndef DOUBLY_INDIRECT
  362:   check_sum = checksum(symbols);
  363: #else /* defined(DOUBLY_INDIRECT) */
  364:   check_sum = (UCell)symbols;
  365: #endif /* defined(DOUBLY_INDIRECT) */
  366:   
  367:   do {
  368:     if(fread(magic,sizeof(Char),8,imagefile) < 8) {
  369:       fprintf(stderr,"%s: image %s doesn't seem to be a Gforth (>=0.4) image.\n",
  370: 	      progname, filename);
  371:       exit(1);
  372:     }
  373:     preamblesize+=8;
  374:   } while(memcmp(magic,"Gforth2",7));
  375:   if (debug) {
  376:     magic[8]='\0';
  377:     fprintf(stderr,"Magic found: %s\n", magic);
  378:   }
  379: 
  380:   if(magic[7] != (ausize << 5) + (charsize << 3) + (cellsize << 1) +
  381: #ifdef WORDS_BIGENDIAN
  382:        0
  383: #else
  384:        1
  385: #endif
  386:        )
  387:     { fprintf(stderr,"This image is %d bit cell, %d bit char, %d bit address unit %s-endian,\n"
  388: 	      "whereas the machine is %d bit cell, %d bit char, %d bit address unit, %s-endian.\n", 
  389: 	      (1<<((magic[7]>>1)&3))*8,
  390: 	      (1<<((magic[7]>>3)&3))*8,
  391: 	      (1<<((magic[7]>>5)&3))*8,
  392: 	      endianstring[magic[7]&1],
  393: 	      (1<<cellsize)*8,
  394: 	      (1<<charsize)*8,
  395: 	      (1<<ausize)*8,
  396: 	      endianstring[
  397: #ifdef WORDS_BIGENDIAN
  398: 		      0
  399: #else
  400: 		      1
  401: #endif
  402: 		      ]);
  403:       exit(-2);
  404:     };
  405: 
  406:   fread((void *)&header,sizeof(ImageHeader),1,imagefile);
  407: 
  408:   set_stack_sizes(&header);
  409:   
  410: #if HAVE_GETPAGESIZE
  411:   pagesize=getpagesize(); /* Linux/GNU libc offers this */
  412: #elif HAVE_SYSCONF && defined(_SC_PAGESIZE)
  413:   pagesize=sysconf(_SC_PAGESIZE); /* POSIX.4 */
  414: #elif PAGESIZE
  415:   pagesize=PAGESIZE; /* in limits.h according to Gallmeister's POSIX.4 book */
  416: #endif
  417:   if (debug)
  418:     fprintf(stderr,"pagesize=%ld\n",(unsigned long) pagesize);
  419: 
  420:   image = dict_alloc(preamblesize+dictsize+data_offset)+data_offset;
  421:   rewind(imagefile);  /* fseek(imagefile,0L,SEEK_SET); */
  422:   if (clear_dictionary)
  423:     memset(image, 0, dictsize);
  424:   fread(image, 1, preamblesize+header.image_size, imagefile);
  425:   imp=image+preamblesize;
  426:   if(header.base==0) {
  427:     Cell reloc_size=((header.image_size-1)/sizeof(Cell))/8+1;
  428:     char reloc_bits[reloc_size];
  429:     fread(reloc_bits, 1, reloc_size, imagefile);
  430:     relocate((Cell *)imp, reloc_bits, header.image_size, symbols);
  431: #if 0
  432:     { /* let's see what the relocator did */
  433:       FILE *snapshot=fopen("snapshot.fi","wb");
  434:       fwrite(image,1,imagesize,snapshot);
  435:       fclose(snapshot);
  436:     }
  437: #endif
  438:   }
  439:   else if(header.base!=imp) {
  440:     fprintf(stderr,"%s: Cannot load nonrelocatable image (compiled for address $%lx) at address $%lx\n",
  441: 	    progname, (unsigned long)header.base, (unsigned long)imp);
  442:     exit(1);
  443:   }
  444:   if (header.checksum==0)
  445:     ((ImageHeader *)imp)->checksum=check_sum;
  446:   else if (header.checksum != check_sum) {
  447:     fprintf(stderr,"%s: Checksum of image ($%lx) does not match the executable ($%lx)\n",
  448: 	    progname, (unsigned long)(header.checksum),(unsigned long)check_sum);
  449:     exit(1);
  450:   }
  451:   fclose(imagefile);
  452: 
  453:   alloc_stacks((ImageHeader *)imp);
  454: 
  455:   CACHE_FLUSH(imp, header.image_size);
  456: 
  457:   return imp;
  458: }
  459: 
  460: int onlypath(char *file)
  461: {
  462:   int i;
  463:   i=strlen(file);
  464:   while (i) {
  465:     if (file[i]=='\\' || file[i]=='/') break;
  466:     i--;
  467:   }
  468:   return i;
  469: }
  470: 
  471: FILE *openimage(char *fullfilename)
  472: {
  473:   FILE *image_file;
  474: 
  475:   image_file=fopen(fullfilename,"rb");
  476:   if (image_file!=NULL && debug)
  477:     fprintf(stderr, "Opened image file: %s\n", fullfilename);
  478:   return image_file;
  479: }
  480: 
  481: FILE *checkimage(char *path, int len, char *imagename)
  482: {
  483:   int dirlen=len;
  484:   char fullfilename[dirlen+strlen(imagename)+2];
  485: 
  486:   memcpy(fullfilename, path, dirlen);
  487:   if (fullfilename[dirlen-1]!='/')
  488:     fullfilename[dirlen++]='/';
  489:   strcpy(fullfilename+dirlen,imagename);
  490:   return openimage(fullfilename);
  491: }
  492: 
  493: FILE * open_image_file(char * imagename, char * path)
  494: {
  495:   FILE * image_file=NULL;
  496:   
  497:   if(strchr(imagename, '/')==NULL) {
  498:     /* first check the directory where the exe file is in !! 01may97jaw */
  499:     if (onlypath(progname))
  500:       image_file=checkimage(progname, onlypath(progname), imagename);
  501:     if (!image_file)
  502:       do {
  503: 	char *pend=strchr(path, PATHSEP);
  504: 	if (pend==NULL)
  505: 	  pend=path+strlen(path);
  506: 	if (strlen(path)==0) break;
  507: 	image_file=checkimage(path, pend-path, imagename);
  508: 	path=pend+(*pend==PATHSEP);
  509:       } while (image_file==NULL);
  510:   } else {
  511:     image_file=openimage(imagename);
  512:   }
  513: 
  514:   if (!image_file) {
  515:     fprintf(stderr,"%s: cannot open image file %s in path %s for reading\n",
  516: 	    progname, imagename, path);
  517:     exit(1);
  518:   }
  519: 
  520:   return image_file;
  521: }
  522: #endif
  523: 
  524: #ifdef HAS_OS
  525: UCell convsize(char *s, UCell elemsize)
  526: /* converts s of the format [0-9]+[bekMGT]? (e.g. 25k) into the number
  527:    of bytes.  the letter at the end indicates the unit, where e stands
  528:    for the element size. default is e */
  529: {
  530:   char *endp;
  531:   UCell n,m;
  532: 
  533:   m = elemsize;
  534:   n = strtoul(s,&endp,0);
  535:   if (endp!=NULL) {
  536:     if (strcmp(endp,"b")==0)
  537:       m=1;
  538:     else if (strcmp(endp,"k")==0)
  539:       m=1024;
  540:     else if (strcmp(endp,"M")==0)
  541:       m=1024*1024;
  542:     else if (strcmp(endp,"G")==0)
  543:       m=1024*1024*1024;
  544:     else if (strcmp(endp,"T")==0) {
  545: #if (SIZEOF_CHAR_P > 4)
  546:       m=1024*1024*1024*1024;
  547: #else
  548:       fprintf(stderr,"%s: size specification \"%s\" too large for this machine\n", progname, endp);
  549:       exit(1);
  550: #endif
  551:     } else if (strcmp(endp,"e")!=0 && strcmp(endp,"")!=0) {
  552:       fprintf(stderr,"%s: cannot grok size specification %s: invalid unit \"%s\"\n", progname, s, endp);
  553:       exit(1);
  554:     }
  555:   }
  556:   return n*m;
  557: }
  558: 
  559: void gforth_args(int argc, char ** argv, char ** path, char ** imagename)
  560: {
  561:   int c;
  562: 
  563:   opterr=0;
  564:   while (1) {
  565:     int option_index=0;
  566:     static struct option opts[] = {
  567:       {"image-file", required_argument, NULL, 'i'},
  568:       {"dictionary-size", required_argument, NULL, 'm'},
  569:       {"data-stack-size", required_argument, NULL, 'd'},
  570:       {"return-stack-size", required_argument, NULL, 'r'},
  571:       {"fp-stack-size", required_argument, NULL, 'f'},
  572:       {"locals-stack-size", required_argument, NULL, 'l'},
  573:       {"path", required_argument, NULL, 'p'},
  574:       {"version", no_argument, NULL, 'v'},
  575:       {"help", no_argument, NULL, 'h'},
  576:       /* put something != 0 into offset_image */
  577:       {"offset-image", no_argument, &offset_image, 1},
  578:       {"no-offset-im", no_argument, &offset_image, 0},
  579:       {"clear-dictionary", no_argument, &clear_dictionary, 1},
  580:       {"die-on-signal", no_argument, &die_on_signal, 1},
  581:       {"debug", no_argument, &debug, 1},
  582:       {0,0,0,0}
  583:       /* no-init-file, no-rc? */
  584:     };
  585:     
  586:     c = getopt_long(argc, argv, "+i:m:d:r:f:l:p:vh", opts, &option_index);
  587:     
  588:     if (c==EOF)
  589:       break;
  590:     if (c=='?') {
  591:       optind--;
  592:       break;
  593:     }
  594:     switch (c) {
  595:     case 'i': *imagename = optarg; break;
  596:     case 'm': dictsize = convsize(optarg,sizeof(Cell)); break;
  597:     case 'd': dsize = convsize(optarg,sizeof(Cell)); break;
  598:     case 'r': rsize = convsize(optarg,sizeof(Cell)); break;
  599:     case 'f': fsize = convsize(optarg,sizeof(Float)); break;
  600:     case 'l': lsize = convsize(optarg,sizeof(Cell)); break;
  601:     case 'p': *path = optarg; break;
  602:     case 'v': fprintf(stderr, "gforth %s\n", VERSION); exit(0);
  603:     case 'h': 
  604:       fprintf(stderr, "Usage: %s [engine options] [image arguments]\n\
  605: Engine Options:\n\
  606:   --clear-dictionary		    Initialize the dictionary with 0 bytes\n\
  607:   -d SIZE, --data-stack-size=SIZE   Specify data stack size\n\
  608:   --debug			    Print debugging information during startup\n\
  609:   --die-on-signal		    exit instead of CATCHing some signals\n\
  610:   -f SIZE, --fp-stack-size=SIZE	    Specify floating point stack size\n\
  611:   -h, --help			    Print this message and exit\n\
  612:   -i FILE, --image-file=FILE	    Use image FILE instead of `gforth.fi'\n\
  613:   -l SIZE, --locals-stack-size=SIZE Specify locals stack size\n\
  614:   -m SIZE, --dictionary-size=SIZE   Specify Forth dictionary size\n\
  615:   --no-offset-im		    Load image at normal position\n\
  616:   --offset-image		    Load image at a different position\n\
  617:   -p PATH, --path=PATH		    Search path for finding image and sources\n\
  618:   -r SIZE, --return-stack-size=SIZE Specify return stack size\n\
  619:   -v, --version			    Print version and exit\n\
  620: SIZE arguments consist of an integer followed by a unit. The unit can be\n\
  621:   `b' (byte), `e' (element; default), `k' (KB), `M' (MB), `G' (GB) or `T' (TB).\n",
  622: 	      argv[0]);
  623:       optind--;
  624:       return;
  625:       exit(0);
  626:     }
  627:   }
  628: }
  629: #endif
  630: 
  631: #ifdef INCLUDE_IMAGE
  632: extern Cell image[];
  633: extern const char reloc_bits[];
  634: #endif
  635: 
  636: int main(int argc, char **argv, char **env)
  637: {
  638:   char *path = getenv("GFORTHPATH") ? : DEFAULTPATH;
  639: #ifndef INCLUDE_IMAGE
  640:   char *imagename="gforth.fi";
  641:   FILE *image_file;
  642:   Address image;
  643: #endif
  644:   int retvalue;
  645: 	  
  646: #if defined(i386) && defined(ALIGNMENT_CHECK) && !defined(DIRECT_THREADED)
  647:   /* turn on alignment checks on the 486.
  648:    * on the 386 this should have no effect. */
  649:   __asm__("pushfl; popl %eax; orl $0x40000, %eax; pushl %eax; popfl;");
  650:   /* this is unusable with Linux' libc.4.6.27, because this library is
  651:      not alignment-clean; we would have to replace some library
  652:      functions (e.g., memcpy) to make it work. Also GCC doesn't try to keep
  653:      the stack FP-aligned. */
  654: #endif
  655: 
  656:   /* buffering of the user output device */
  657: #ifdef _IONBF
  658:   if (isatty(fileno(stdout))) {
  659:     fflush(stdout);
  660:     setvbuf(stdout,NULL,_IONBF,0);
  661:   }
  662: #endif
  663: 
  664:   progname = argv[0];
  665: 
  666: #ifdef HAS_OS
  667:   gforth_args(argc, argv, &path, &imagename);
  668: #endif
  669: 
  670: #ifdef INCLUDE_IMAGE
  671:   set_stack_sizes((ImageHeader *)image);
  672:   relocate(image, reloc_bits, ((ImageHeader*)&image)->image_size, (Label*)engine(0, 0, 0, 0, 0));
  673:   alloc_stacks((ImageHeader *)image);
  674: #else
  675:   image_file = open_image_file(imagename, path);
  676:   image = loader(image_file, imagename);
  677: #endif
  678: 
  679:   {
  680:     char path2[strlen(path)+1];
  681:     char *p1, *p2;
  682:     Cell environ[]= {
  683:       (Cell)argc-(optind-1),
  684:       (Cell)(argv+(optind-1)),
  685:       (Cell)strlen(path),
  686:       (Cell)path2};
  687:     argv[optind-1] = progname;
  688:     /*
  689:        for (i=0; i<environ[0]; i++)
  690:        printf("%s\n", ((char **)(environ[1]))[i]);
  691:        */
  692:     /* make path OS-independent by replacing path separators with NUL */
  693:     for (p1=path, p2=path2; *p1!='\0'; p1++, p2++)
  694:       if (*p1==PATHSEP)
  695: 	*p2 = '\0';
  696:       else
  697: 	*p2 = *p1;
  698:     *p2='\0';
  699:     retvalue = go_forth(image, 4, environ);
  700:     deprep_terminal();
  701:   }
  702:   return retvalue;
  703: }

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