File:  [gforth] / gforth / engine / main.c
Revision 1.18: download - view: text, annotated - select for diffs
Fri Jan 8 16:58:31 1999 UTC (25 years, 2 months ago) by anton
Branches: MAIN
CVS tags: HEAD
there is now a debugging version of the engine that maintains ip and
rp in global variables (to allow backtrace on signals). The debugging
engine is called gforth and the original engine is called gforth-fast.

    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))/RELINFOBITS;
  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:   ImageHeader *image_header = (ImageHeader *)image;
  301:   Cell *sp0=(Cell*)(image_header->data_stack_base + dsize);
  302:   Float *fp0=(Float *)(image_header->fp_stack_base + fsize);
  303:   Cell *rp0=(Cell *)(image_header->return_stack_base + rsize);
  304:   Address lp0=image_header->locals_stack_base + lsize;
  305:   Xt *ip0=(Xt *)(image_header->boot_entry);
  306: #ifdef SYSSIGNALS
  307:   int throw_code;
  308: #endif
  309: 
  310:   /* ensure that the cached elements (if any) are accessible */
  311:   IF_TOS(sp0--);
  312:   IF_FTOS(fp0--);
  313:   
  314:   for(;stack>0;stack--)
  315:     *--sp0=entries[stack-1];
  316: 
  317: #if !defined(MSDOS) && !defined(SHARC) && !defined(_WIN32) && !defined(__EMX__)
  318:   get_winsize();
  319: #endif
  320:    
  321: #ifdef SYSSIGNALS
  322:   install_signal_handlers(); /* right place? */
  323:   
  324:   if ((throw_code=setjmp(throw_jmp_buf))) {
  325:     static Cell signal_data_stack[8];
  326:     static Cell signal_return_stack[8];
  327:     static Float signal_fp_stack[1];
  328: 
  329:     signal_data_stack[7]=throw_code;
  330: 
  331: #ifdef GFORTH_DEBUGGING
  332:     if (rp <= rp0 && rp > (Cell *)(image_header->return_stack_base+5)) {
  333:       /* no rstack overflow or underflow */
  334:       rp0 = rp;
  335:       *--rp0 = ip;
  336:     }
  337:     else /* I love non-syntactic ifdefs :-) */
  338: #endif
  339:     rp0 = signal_return_stack+8;
  340:     
  341:     return((int)engine(image_header->throw_entry, signal_data_stack+7,
  342: 		       rp0, signal_fp_stack, 0));
  343:   }
  344: #endif
  345: 
  346:   return((int)engine(ip0,sp0,rp0,fp0,lp0));
  347: }
  348: 
  349: #ifndef INCLUDE_IMAGE
  350: Address loader(FILE *imagefile, char* filename)
  351: /* returns the address of the image proper (after the preamble) */
  352: {
  353:   ImageHeader header;
  354:   Address image;
  355:   Address imp; /* image+preamble */
  356:   Char magic[8];
  357:   char magic7; /* size byte of magic number */
  358:   Cell preamblesize=0;
  359:   Label *symbols = engine(0,0,0,0,0);
  360:   Cell data_offset = offset_image ? 56*sizeof(Cell) : 0;
  361:   UCell check_sum;
  362:   static char* endianstring[]= { "big","little" };
  363:   Cell ausize = ((RELINFOBITS ==  8) ? 0 :
  364: 		 (RELINFOBITS == 16) ? 1 :
  365: 		 (RELINFOBITS == 32) ? 2 : 3);
  366:   Cell charsize = ((sizeof(Char) == 1) ? 0 :
  367: 		   (sizeof(Char) == 2) ? 1 :
  368: 		   (sizeof(Char) == 4) ? 2 : 3) + ausize;
  369:   Cell cellsize = ((sizeof(Cell) == 1) ? 0 :
  370: 		   (sizeof(Cell) == 2) ? 1 :
  371: 		   (sizeof(Cell) == 4) ? 2 : 3) + ausize;
  372:   
  373: 
  374: #ifndef DOUBLY_INDIRECT
  375:   check_sum = checksum(symbols);
  376: #else /* defined(DOUBLY_INDIRECT) */
  377:   check_sum = (UCell)symbols;
  378: #endif /* defined(DOUBLY_INDIRECT) */
  379:   
  380:   do {
  381:     if(fread(magic,sizeof(Char),8,imagefile) < 8) {
  382:       fprintf(stderr,"%s: image %s doesn't seem to be a Gforth (>=0.4) image.\n",
  383: 	      progname, filename);
  384:       exit(1);
  385:     }
  386:     preamblesize+=8;
  387:   } while(memcmp(magic,"Gforth2",7));
  388:   magic7 = magic[7];
  389:   if (debug) {
  390:     magic[7]='\0';
  391:     fprintf(stderr,"Magic found: %s $%x\n", magic, magic7);
  392:   }
  393: 
  394:   if(magic7 != (ausize << 5) + (charsize << 3) + (cellsize << 1) +
  395: #ifdef WORDS_BIGENDIAN
  396:        0
  397: #else
  398:        1
  399: #endif
  400:        )
  401:     { fprintf(stderr,"This image is %d bit cell, %d bit char, %d bit address unit %s-endian,\n"
  402: 	      "whereas the machine is %d bit cell, %d bit char, %d bit address unit, %s-endian.\n", 
  403: 	      (1<<((magic7>>1)&3))*8,
  404: 	      (1<<((magic7>>3)&3))*8,
  405: 	      (1<<((magic7>>5)&3))*8,
  406: 	      endianstring[magic7&1],
  407: 	      (1<<cellsize)*8,
  408: 	      (1<<charsize)*8,
  409: 	      (1<<ausize)*8,
  410: 	      endianstring[
  411: #ifdef WORDS_BIGENDIAN
  412: 		      0
  413: #else
  414: 		      1
  415: #endif
  416: 		      ]);
  417:       exit(-2);
  418:     };
  419: 
  420:   fread((void *)&header,sizeof(ImageHeader),1,imagefile);
  421: 
  422:   set_stack_sizes(&header);
  423:   
  424: #if HAVE_GETPAGESIZE
  425:   pagesize=getpagesize(); /* Linux/GNU libc offers this */
  426: #elif HAVE_SYSCONF && defined(_SC_PAGESIZE)
  427:   pagesize=sysconf(_SC_PAGESIZE); /* POSIX.4 */
  428: #elif PAGESIZE
  429:   pagesize=PAGESIZE; /* in limits.h according to Gallmeister's POSIX.4 book */
  430: #endif
  431:   if (debug)
  432:     fprintf(stderr,"pagesize=%ld\n",(unsigned long) pagesize);
  433: 
  434:   image = dict_alloc(preamblesize+dictsize+data_offset)+data_offset;
  435:   rewind(imagefile);  /* fseek(imagefile,0L,SEEK_SET); */
  436:   if (clear_dictionary)
  437:     memset(image, 0, dictsize);
  438:   fread(image, 1, preamblesize+header.image_size, imagefile);
  439:   imp=image+preamblesize;
  440:   if(header.base==0) {
  441:     Cell reloc_size=((header.image_size-1)/sizeof(Cell))/8+1;
  442:     char reloc_bits[reloc_size];
  443:     fread(reloc_bits, 1, reloc_size, imagefile);
  444:     relocate((Cell *)imp, reloc_bits, header.image_size, symbols);
  445: #if 0
  446:     { /* let's see what the relocator did */
  447:       FILE *snapshot=fopen("snapshot.fi","wb");
  448:       fwrite(image,1,imagesize,snapshot);
  449:       fclose(snapshot);
  450:     }
  451: #endif
  452:   }
  453:   else if(header.base!=imp) {
  454:     fprintf(stderr,"%s: Cannot load nonrelocatable image (compiled for address $%lx) at address $%lx\n",
  455: 	    progname, (unsigned long)header.base, (unsigned long)imp);
  456:     exit(1);
  457:   }
  458:   if (header.checksum==0)
  459:     ((ImageHeader *)imp)->checksum=check_sum;
  460:   else if (header.checksum != check_sum) {
  461:     fprintf(stderr,"%s: Checksum of image ($%lx) does not match the executable ($%lx)\n",
  462: 	    progname, (unsigned long)(header.checksum),(unsigned long)check_sum);
  463:     exit(1);
  464:   }
  465:   fclose(imagefile);
  466: 
  467:   alloc_stacks((ImageHeader *)imp);
  468: 
  469:   CACHE_FLUSH(imp, header.image_size);
  470: 
  471:   return imp;
  472: }
  473: 
  474: int onlypath(char *file)
  475: {
  476:   int i;
  477:   i=strlen(file);
  478:   while (i) {
  479:     if (file[i]=='\\' || file[i]=='/') break;
  480:     i--;
  481:   }
  482:   return i;
  483: }
  484: 
  485: FILE *openimage(char *fullfilename)
  486: {
  487:   FILE *image_file;
  488: 
  489:   image_file=fopen(fullfilename,"rb");
  490:   if (image_file!=NULL && debug)
  491:     fprintf(stderr, "Opened image file: %s\n", fullfilename);
  492:   return image_file;
  493: }
  494: 
  495: FILE *checkimage(char *path, int len, char *imagename)
  496: {
  497:   int dirlen=len;
  498:   char fullfilename[dirlen+strlen(imagename)+2];
  499: 
  500:   memcpy(fullfilename, path, dirlen);
  501:   if (fullfilename[dirlen-1]!='/')
  502:     fullfilename[dirlen++]='/';
  503:   strcpy(fullfilename+dirlen,imagename);
  504:   return openimage(fullfilename);
  505: }
  506: 
  507: FILE * open_image_file(char * imagename, char * path)
  508: {
  509:   FILE * image_file=NULL;
  510:   
  511:   if(strchr(imagename, '/')==NULL) {
  512:     /* first check the directory where the exe file is in !! 01may97jaw */
  513:     if (onlypath(progname))
  514:       image_file=checkimage(progname, onlypath(progname), imagename);
  515:     if (!image_file)
  516:       do {
  517: 	char *pend=strchr(path, PATHSEP);
  518: 	if (pend==NULL)
  519: 	  pend=path+strlen(path);
  520: 	if (strlen(path)==0) break;
  521: 	image_file=checkimage(path, pend-path, imagename);
  522: 	path=pend+(*pend==PATHSEP);
  523:       } while (image_file==NULL);
  524:   } else {
  525:     image_file=openimage(imagename);
  526:   }
  527: 
  528:   if (!image_file) {
  529:     fprintf(stderr,"%s: cannot open image file %s in path %s for reading\n",
  530: 	    progname, imagename, path);
  531:     exit(1);
  532:   }
  533: 
  534:   return image_file;
  535: }
  536: #endif
  537: 
  538: #ifdef HAS_OS
  539: UCell convsize(char *s, UCell elemsize)
  540: /* converts s of the format [0-9]+[bekMGT]? (e.g. 25k) into the number
  541:    of bytes.  the letter at the end indicates the unit, where e stands
  542:    for the element size. default is e */
  543: {
  544:   char *endp;
  545:   UCell n,m;
  546: 
  547:   m = elemsize;
  548:   n = strtoul(s,&endp,0);
  549:   if (endp!=NULL) {
  550:     if (strcmp(endp,"b")==0)
  551:       m=1;
  552:     else if (strcmp(endp,"k")==0)
  553:       m=1024;
  554:     else if (strcmp(endp,"M")==0)
  555:       m=1024*1024;
  556:     else if (strcmp(endp,"G")==0)
  557:       m=1024*1024*1024;
  558:     else if (strcmp(endp,"T")==0) {
  559: #if (SIZEOF_CHAR_P > 4)
  560:       m=1024*1024*1024*1024;
  561: #else
  562:       fprintf(stderr,"%s: size specification \"%s\" too large for this machine\n", progname, endp);
  563:       exit(1);
  564: #endif
  565:     } else if (strcmp(endp,"e")!=0 && strcmp(endp,"")!=0) {
  566:       fprintf(stderr,"%s: cannot grok size specification %s: invalid unit \"%s\"\n", progname, s, endp);
  567:       exit(1);
  568:     }
  569:   }
  570:   return n*m;
  571: }
  572: 
  573: void gforth_args(int argc, char ** argv, char ** path, char ** imagename)
  574: {
  575:   int c;
  576: 
  577:   opterr=0;
  578:   while (1) {
  579:     int option_index=0;
  580:     static struct option opts[] = {
  581:       {"image-file", required_argument, NULL, 'i'},
  582:       {"dictionary-size", required_argument, NULL, 'm'},
  583:       {"data-stack-size", required_argument, NULL, 'd'},
  584:       {"return-stack-size", required_argument, NULL, 'r'},
  585:       {"fp-stack-size", required_argument, NULL, 'f'},
  586:       {"locals-stack-size", required_argument, NULL, 'l'},
  587:       {"path", required_argument, NULL, 'p'},
  588:       {"version", no_argument, NULL, 'v'},
  589:       {"help", no_argument, NULL, 'h'},
  590:       /* put something != 0 into offset_image */
  591:       {"offset-image", no_argument, &offset_image, 1},
  592:       {"no-offset-im", no_argument, &offset_image, 0},
  593:       {"clear-dictionary", no_argument, &clear_dictionary, 1},
  594:       {"die-on-signal", no_argument, &die_on_signal, 1},
  595:       {"debug", no_argument, &debug, 1},
  596:       {0,0,0,0}
  597:       /* no-init-file, no-rc? */
  598:     };
  599:     
  600:     c = getopt_long(argc, argv, "+i:m:d:r:f:l:p:vh", opts, &option_index);
  601:     
  602:     if (c==EOF)
  603:       break;
  604:     if (c=='?') {
  605:       optind--;
  606:       break;
  607:     }
  608:     switch (c) {
  609:     case 'i': *imagename = optarg; break;
  610:     case 'm': dictsize = convsize(optarg,sizeof(Cell)); break;
  611:     case 'd': dsize = convsize(optarg,sizeof(Cell)); break;
  612:     case 'r': rsize = convsize(optarg,sizeof(Cell)); break;
  613:     case 'f': fsize = convsize(optarg,sizeof(Float)); break;
  614:     case 'l': lsize = convsize(optarg,sizeof(Cell)); break;
  615:     case 'p': *path = optarg; break;
  616:     case 'v': fprintf(stderr, "gforth %s\n", VERSION); exit(0);
  617:     case 'h': 
  618:       fprintf(stderr, "Usage: %s [engine options] [image arguments]\n\
  619: Engine Options:\n\
  620:   --clear-dictionary		    Initialize the dictionary with 0 bytes\n\
  621:   -d SIZE, --data-stack-size=SIZE   Specify data stack size\n\
  622:   --debug			    Print debugging information during startup\n\
  623:   --die-on-signal		    exit instead of CATCHing some signals\n\
  624:   -f SIZE, --fp-stack-size=SIZE	    Specify floating point stack size\n\
  625:   -h, --help			    Print this message and exit\n\
  626:   -i FILE, --image-file=FILE	    Use image FILE instead of `gforth.fi'\n\
  627:   -l SIZE, --locals-stack-size=SIZE Specify locals stack size\n\
  628:   -m SIZE, --dictionary-size=SIZE   Specify Forth dictionary size\n\
  629:   --no-offset-im		    Load image at normal position\n\
  630:   --offset-image		    Load image at a different position\n\
  631:   -p PATH, --path=PATH		    Search path for finding image and sources\n\
  632:   -r SIZE, --return-stack-size=SIZE Specify return stack size\n\
  633:   -v, --version			    Print version and exit\n\
  634: SIZE arguments consist of an integer followed by a unit. The unit can be\n\
  635:   `b' (byte), `e' (element; default), `k' (KB), `M' (MB), `G' (GB) or `T' (TB).\n",
  636: 	      argv[0]);
  637:       optind--;
  638:       return;
  639:       exit(0);
  640:     }
  641:   }
  642: }
  643: #endif
  644: 
  645: #ifdef INCLUDE_IMAGE
  646: extern Cell image[];
  647: extern const char reloc_bits[];
  648: #endif
  649: 
  650: int main(int argc, char **argv, char **env)
  651: {
  652:   char *path = getenv("GFORTHPATH") ? : DEFAULTPATH;
  653: #ifndef INCLUDE_IMAGE
  654:   char *imagename="gforth.fi";
  655:   FILE *image_file;
  656:   Address image;
  657: #endif
  658:   int retvalue;
  659: 	  
  660: #if defined(i386) && defined(ALIGNMENT_CHECK) && !defined(DIRECT_THREADED)
  661:   /* turn on alignment checks on the 486.
  662:    * on the 386 this should have no effect. */
  663:   __asm__("pushfl; popl %eax; orl $0x40000, %eax; pushl %eax; popfl;");
  664:   /* this is unusable with Linux' libc.4.6.27, because this library is
  665:      not alignment-clean; we would have to replace some library
  666:      functions (e.g., memcpy) to make it work. Also GCC doesn't try to keep
  667:      the stack FP-aligned. */
  668: #endif
  669: 
  670:   /* buffering of the user output device */
  671: #ifdef _IONBF
  672:   if (isatty(fileno(stdout))) {
  673:     fflush(stdout);
  674:     setvbuf(stdout,NULL,_IONBF,0);
  675:   }
  676: #endif
  677: 
  678:   progname = argv[0];
  679: 
  680: #ifdef HAS_OS
  681:   gforth_args(argc, argv, &path, &imagename);
  682: #endif
  683: 
  684: #ifdef INCLUDE_IMAGE
  685:   set_stack_sizes((ImageHeader *)image);
  686:   relocate(image, reloc_bits, ((ImageHeader*)&image)->image_size, (Label*)engine(0, 0, 0, 0, 0));
  687:   alloc_stacks((ImageHeader *)image);
  688: #else
  689:   image_file = open_image_file(imagename, path);
  690:   image = loader(image_file, imagename);
  691: #endif
  692: 
  693:   {
  694:     char path2[strlen(path)+1];
  695:     char *p1, *p2;
  696:     Cell environ[]= {
  697:       (Cell)argc-(optind-1),
  698:       (Cell)(argv+(optind-1)),
  699:       (Cell)strlen(path),
  700:       (Cell)path2};
  701:     argv[optind-1] = progname;
  702:     /*
  703:        for (i=0; i<environ[0]; i++)
  704:        printf("%s\n", ((char **)(environ[1]))[i]);
  705:        */
  706:     /* make path OS-independent by replacing path separators with NUL */
  707:     for (p1=path, p2=path2; *p1!='\0'; p1++, p2++)
  708:       if (*p1==PATHSEP)
  709: 	*p2 = '\0';
  710:       else
  711: 	*p2 = *p1;
  712:     *p2='\0';
  713:     retvalue = go_forth(image, 4, environ);
  714:     deprep_terminal();
  715:   }
  716:   return retvalue;
  717: }

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