File:  [gforth] / gforth / engine / main.c
Revision 1.30: download - view: text, annotated - select for diffs
Sat Aug 7 21:40:37 1999 UTC (24 years, 7 months ago) by pazsan
Branches: MAIN
CVS tags: HEAD
Made USE_TOS work with 386 on gcc 2.95

    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: UCell pagesize=1;
   76: char *progname;
   77: #else
   78: char *progname = "gforth";
   79: int optind = 1;
   80: #endif
   81: #ifdef HAS_DEBUG
   82: static int debug=0;
   83: #endif
   84: ImageHeader *gforth_header;
   85: 
   86: #ifdef MEMCMP_AS_SUBROUTINE
   87: int gforth_memcmp(const char * s1, const char * s2, size_t n)
   88: {
   89:   return memcmp(s1, s2, n);
   90: }
   91: #endif
   92: 
   93: /* image file format:
   94:  *  "#! binary-path -i\n" (e.g., "#! /usr/local/bin/gforth-0.4.0 -i\n")
   95:  *   padding to a multiple of 8
   96:  *   magic: "Gforth2x" means format 0.4,
   97:  *              where x is a byte with
   98:  *              bit 7:   reserved = 0
   99:  *              bit 6:5: address unit size 2^n octets
  100:  *              bit 4:3: character size 2^n octets
  101:  *              bit 2:1: cell size 2^n octets
  102:  *              bit 0:   endian, big=0, little=1.
  103:  *  The magic are always 8 octets, no matter what the native AU/character size is
  104:  *  padding to max alignment (no padding necessary on current machines)
  105:  *  ImageHeader structure (see forth.h)
  106:  *  data (size in ImageHeader.image_size)
  107:  *  tags ((if relocatable, 1 bit/data cell)
  108:  *
  109:  * tag==1 means that the corresponding word is an address;
  110:  * If the word is >=0, the address is within the image;
  111:  * addresses within the image are given relative to the start of the image.
  112:  * If the word =-1 (CF_NIL), the address is NIL,
  113:  * If the word is <CF_NIL and >CF(DODOES), it's a CFA (:, Create, ...)
  114:  * If the word =CF(DODOES), it's a DOES> CFA
  115:  * If the word =CF(DOESJUMP), it's a DOES JUMP (2 Cells after DOES>,
  116:  *					possibly containing a jump to dodoes)
  117:  * If the word is <CF(DOESJUMP), it's a primitive
  118:  */
  119: 
  120: void relocate(Cell *image, const char *bitstring, int size, Label symbols[])
  121: {
  122:   int i=0, j, k, steps=(size/sizeof(Cell))/RELINFOBITS;
  123:   Cell token;
  124:   char bits;
  125: /*   static char bits[8]={0x80,0x40,0x20,0x10,0x08,0x04,0x02,0x01};*/
  126: 
  127: /*  printf("relocating %x[%x]\n", image, size); */
  128:    
  129:   for(k=0; k<=steps; k++)
  130:     for(j=0, bits=bitstring[k]; j<RELINFOBITS; j++, i++, bits<<=1) {
  131:       /*      fprintf(stderr,"relocate: image[%d]\n", i);*/
  132:       if(bits & (1U << (RELINFOBITS-1))) {
  133: 	/* fprintf(stderr,"relocate: image[%d]=%d\n", i, image[i]);*/
  134: 	if((token=image[i])<0)
  135: 	  switch(token)
  136: 	    {
  137: 	    case CF_NIL      : image[i]=0; break;
  138: #if !defined(DOUBLY_INDIRECT)
  139: 	    case CF(DOCOL)   :
  140: 	    case CF(DOVAR)   :
  141: 	    case CF(DOCON)   :
  142: 	    case CF(DOUSER)  : 
  143: 	    case CF(DODEFER) : 
  144: 	    case CF(DOFIELD) : MAKE_CF(image+i,symbols[CF(token)]); break;
  145: 	    case CF(DOESJUMP): MAKE_DOES_HANDLER(image+i); break;
  146: #endif /* !defined(DOUBLY_INDIRECT) */
  147: 	    case CF(DODOES)  :
  148: 	      MAKE_DOES_CF(image+i,image[i+1]+((Cell)image));
  149: 	      break;
  150: 	    default          :
  151: /*	      printf("Code field generation image[%x]:=CA(%x)\n",
  152: 		     i, CF(image[i])); */
  153: 	      image[i]=(Cell)CA(CF(token));
  154: 	    }
  155: 	else
  156: 	  image[i]+=(Cell)image;
  157:       }
  158:     }
  159:   ((ImageHeader*)(image))->base = (Address) image;
  160: }
  161: 
  162: UCell checksum(Label symbols[])
  163: {
  164:   UCell r=PRIM_VERSION;
  165:   Cell i;
  166: 
  167:   for (i=DOCOL; i<=DOESJUMP; i++) {
  168:     r ^= (UCell)(symbols[i]);
  169:     r = (r << 5) | (r >> (8*sizeof(Cell)-5));
  170:   }
  171: #ifdef DIRECT_THREADED
  172:   /* we have to consider all the primitives */
  173:   for (; symbols[i]!=(Label)0; i++) {
  174:     r ^= (UCell)(symbols[i]);
  175:     r = (r << 5) | (r >> (8*sizeof(Cell)-5));
  176:   }
  177: #else
  178:   /* in indirect threaded code all primitives are accessed through the
  179:      symbols table, so we just have to put the base address of symbols
  180:      in the checksum */
  181:   r ^= (UCell)symbols;
  182: #endif
  183:   return r;
  184: }
  185: 
  186: Address verbose_malloc(Cell size)
  187: {
  188:   Address r;
  189:   /* leave a little room (64B) for stack underflows */
  190:   if ((r = malloc(size+64))==NULL) {
  191: #ifdef HAS_DEBUG
  192:     perror(progname);
  193: #endif
  194:     exit(1);
  195:   }
  196:   r = (Address)((((Cell)r)+(sizeof(Float)-1))&(-sizeof(Float)));
  197: #ifdef HAS_DEBUG
  198:   if (debug)
  199:     fprintf(stderr, "malloc succeeds, address=$%lx\n", (long)r);
  200: #endif
  201:   return r;
  202: }
  203: 
  204: Address my_alloc(Cell size)
  205: {
  206: #if HAVE_MMAP
  207:   static Address next_address=0;
  208:   Address r;
  209: 
  210: #if defined(MAP_ANON)
  211: #ifdef HAS_DEBUG
  212:   if (debug)
  213:     fprintf(stderr,"try mmap($%lx, $%lx, ..., MAP_ANON, ...); ", (long)next_address, (long)size);
  214: #endif
  215:   r=mmap(next_address, size, PROT_EXEC|PROT_READ|PROT_WRITE, MAP_ANON|MAP_PRIVATE, -1, 0);
  216: #else /* !defined(MAP_ANON) */
  217:   /* Ultrix (at least) does not define MAP_FILE and MAP_PRIVATE (both are
  218:      apparently defaults) */
  219: #ifndef MAP_FILE
  220: # define MAP_FILE 0
  221: #endif
  222: #ifndef MAP_PRIVATE
  223: # define MAP_PRIVATE 0
  224: #endif
  225:   static int dev_zero=-1;
  226: 
  227:   if (dev_zero == -1)
  228:     dev_zero = open("/dev/zero", O_RDONLY);
  229:   if (dev_zero == -1) {
  230:     r = (Address)-1;
  231: #ifdef HAS_DEBUG
  232:     if (debug)
  233:       fprintf(stderr, "open(\"/dev/zero\"...) failed (%s), no mmap; ", 
  234: 	      strerror(errno));
  235: #endif
  236:   } else {
  237: #ifdef HAS_DEBUG
  238:     if (debug)
  239:       fprintf(stderr,"try mmap($%lx, $%lx, ..., MAP_FILE, dev_zero, ...); ", (long)next_address, (long)size);
  240: #endif
  241:     r=mmap(next_address, size, PROT_EXEC|PROT_READ|PROT_WRITE, MAP_FILE|MAP_PRIVATE, dev_zero, 0);
  242:   }
  243: #endif /* !defined(MAP_ANON) */
  244: 
  245:   if (r != (Address)-1) {
  246: #ifdef HAS_DEBUG
  247:     if (debug)
  248:       fprintf(stderr, "success, address=$%lx\n", (long) r);
  249: #endif
  250:     if (pagesize != 1)
  251:       next_address = (Address)(((((Cell)r)+size-1)&-pagesize)+2*pagesize); /* leave one page unmapped */
  252:     return r;
  253:   }
  254: #ifdef HAS_DEBUG
  255:   if (debug)
  256:     fprintf(stderr, "failed: %s\n", strerror(errno));
  257: #endif
  258: #endif /* HAVE_MMAP */
  259:   /* use malloc as fallback */
  260:   return verbose_malloc(size);
  261: }
  262: 
  263: #if (defined(mips) && !defined(INDIRECT_THREADED))
  264: /* the 256MB jump restriction on the MIPS architecture makes the
  265:    combination of direct threading and mmap unsafe. */
  266: #define dict_alloc(size) verbose_malloc(size)
  267: #else
  268: #define dict_alloc(size) my_alloc(size)
  269: #endif
  270: 
  271: void set_stack_sizes(ImageHeader * header)
  272: {
  273:   if (dictsize==0)
  274:     dictsize = header->dict_size;
  275:   if (dsize==0)
  276:     dsize = header->data_stack_size;
  277:   if (rsize==0)
  278:     rsize = header->return_stack_size;
  279:   if (fsize==0)
  280:     fsize = header->fp_stack_size;
  281:   if (lsize==0)
  282:     lsize = header->locals_stack_size;
  283:   dictsize=maxaligned(dictsize);
  284:   dsize=maxaligned(dsize);
  285:   rsize=maxaligned(rsize);
  286:   lsize=maxaligned(lsize);
  287:   fsize=maxaligned(fsize);
  288: }
  289: 
  290: void alloc_stacks(ImageHeader * header)
  291: {
  292:   header->dict_size=dictsize;
  293:   header->data_stack_size=dsize;
  294:   header->fp_stack_size=fsize;
  295:   header->return_stack_size=rsize;
  296:   header->locals_stack_size=lsize;
  297: 
  298:   header->data_stack_base=my_alloc(dsize);
  299:   header->fp_stack_base=my_alloc(fsize);
  300:   header->return_stack_base=my_alloc(rsize);
  301:   header->locals_stack_base=my_alloc(lsize);
  302: }
  303: 
  304: int go_forth(Address image, int stack, Cell *entries)
  305: {
  306:   ImageHeader *image_header = (ImageHeader *)image;
  307:   Cell *sp0=(Cell*)(image_header->data_stack_base + dsize);
  308:   Float *fp0=(Float *)(image_header->fp_stack_base + fsize);
  309:   Cell *rp0=(Cell *)(image_header->return_stack_base + rsize);
  310:   Address lp0=image_header->locals_stack_base + lsize;
  311:   Xt *ip0=(Xt *)(image_header->boot_entry);
  312: #ifdef SYSSIGNALS
  313:   int throw_code;
  314: #endif
  315: 
  316:   /* ensure that the cached elements (if any) are accessible */
  317:   IF_TOS(sp0--);
  318:   IF_FTOS(fp0--);
  319:   
  320:   for(;stack>0;stack--)
  321:     *--sp0=entries[stack-1];
  322: 
  323: #ifdef SYSSIGNALS
  324:   get_winsize();
  325:    
  326:   install_signal_handlers(); /* right place? */
  327:   
  328:   if ((throw_code=setjmp(throw_jmp_buf))) {
  329:     static Cell signal_data_stack[8];
  330:     static Cell signal_return_stack[8];
  331:     static Float signal_fp_stack[1];
  332: 
  333:     signal_data_stack[7]=throw_code;
  334: 
  335: #ifdef GFORTH_DEBUGGING
  336:     if (rp <= rp0 && rp > (Cell *)(image_header->return_stack_base+5)) {
  337:       /* no rstack overflow or underflow */
  338:       rp0 = rp;
  339:       *--rp0 = (Cell)ip;
  340:     }
  341:     else /* I love non-syntactic ifdefs :-) */
  342: #endif
  343:     rp0 = signal_return_stack+8;
  344:     /* fprintf(stderr, "rp=$%x\n",rp0);*/
  345:     
  346:     return((int)engine(image_header->throw_entry, signal_data_stack+7,
  347: 		       rp0, signal_fp_stack, 0));
  348:   }
  349: #endif
  350: 
  351:   return((int)engine(ip0,sp0,rp0,fp0,lp0));
  352: }
  353: 
  354: 
  355: #ifndef INCLUDE_IMAGE
  356: void print_sizes(Cell sizebyte)
  357:      /* print size information */
  358: {
  359:   static char* endianstring[]= { "   big","little" };
  360:   
  361:   fprintf(stderr,"%s endian, cell=%d bytes, char=%d bytes, au=%d bytes\n",
  362: 	  endianstring[sizebyte & 1],
  363: 	  1 << ((sizebyte >> 1) & 3),
  364: 	  1 << ((sizebyte >> 3) & 3),
  365: 	  1 << ((sizebyte >> 5) & 3));
  366: }
  367: 
  368: Address loader(FILE *imagefile, char* filename)
  369: /* returns the address of the image proper (after the preamble) */
  370: {
  371:   ImageHeader header;
  372:   Address image;
  373:   Address imp; /* image+preamble */
  374:   Char magic[8];
  375:   char magic7; /* size byte of magic number */
  376:   Cell preamblesize=0;
  377:   Label *symbols = engine(0,0,0,0,0);
  378:   Cell data_offset = offset_image ? 56*sizeof(Cell) : 0;
  379:   UCell check_sum;
  380:   Cell ausize = ((RELINFOBITS ==  8) ? 0 :
  381: 		 (RELINFOBITS == 16) ? 1 :
  382: 		 (RELINFOBITS == 32) ? 2 : 3);
  383:   Cell charsize = ((sizeof(Char) == 1) ? 0 :
  384: 		   (sizeof(Char) == 2) ? 1 :
  385: 		   (sizeof(Char) == 4) ? 2 : 3) + ausize;
  386:   Cell cellsize = ((sizeof(Cell) == 1) ? 0 :
  387: 		   (sizeof(Cell) == 2) ? 1 :
  388: 		   (sizeof(Cell) == 4) ? 2 : 3) + ausize;
  389:   Cell sizebyte = (ausize << 5) + (charsize << 3) + (cellsize << 1) +
  390: #ifdef WORDS_BIGENDIAN
  391:        0
  392: #else
  393:        1
  394: #endif
  395:     ;
  396: 
  397: #ifndef DOUBLY_INDIRECT
  398:   check_sum = checksum(symbols);
  399: #else /* defined(DOUBLY_INDIRECT) */
  400:   check_sum = (UCell)symbols;
  401: #endif /* defined(DOUBLY_INDIRECT) */
  402:   
  403:   do {
  404:     if(fread(magic,sizeof(Char),8,imagefile) < 8) {
  405:       fprintf(stderr,"%s: image %s doesn't seem to be a Gforth (>=0.4) image.\n",
  406: 	      progname, filename);
  407:       exit(1);
  408:     }
  409:     preamblesize+=8;
  410:   } while(memcmp(magic,"Gforth2",7));
  411:   magic7 = magic[7];
  412: #ifdef HAS_DEBUG
  413:   if (debug) {
  414:     magic[7]='\0';
  415:     fprintf(stderr,"Magic found: %s ", magic);
  416:     print_sizes(magic7);
  417:   }
  418: #endif
  419: 
  420:   if (magic7 != sizebyte)
  421:     {
  422:       fprintf(stderr,"This image is:         ");
  423:       print_sizes(magic7);
  424:       fprintf(stderr,"whereas the machine is ");
  425:       print_sizes(sizebyte);
  426:       exit(-2);
  427:     };
  428: 
  429:   fread((void *)&header,sizeof(ImageHeader),1,imagefile);
  430: 
  431:   set_stack_sizes(&header);
  432:   
  433: #if HAVE_GETPAGESIZE
  434:   pagesize=getpagesize(); /* Linux/GNU libc offers this */
  435: #elif HAVE_SYSCONF && defined(_SC_PAGESIZE)
  436:   pagesize=sysconf(_SC_PAGESIZE); /* POSIX.4 */
  437: #elif PAGESIZE
  438:   pagesize=PAGESIZE; /* in limits.h according to Gallmeister's POSIX.4 book */
  439: #endif
  440: #ifdef HAS_DEBUG
  441:   if (debug)
  442:     fprintf(stderr,"pagesize=%ld\n",(unsigned long) pagesize);
  443: #endif
  444: 
  445:   image = dict_alloc(preamblesize+dictsize+data_offset)+data_offset;
  446:   rewind(imagefile);  /* fseek(imagefile,0L,SEEK_SET); */
  447:   if (clear_dictionary)
  448:     memset(image, 0, dictsize);
  449:   fread(image, 1, preamblesize+header.image_size, imagefile);
  450:   imp=image+preamblesize;
  451:   if(header.base==0) {
  452:     Cell reloc_size=((header.image_size-1)/sizeof(Cell))/8+1;
  453:     char reloc_bits[reloc_size];
  454:     fread(reloc_bits, 1, reloc_size, imagefile);
  455:     relocate((Cell *)imp, reloc_bits, header.image_size, symbols);
  456: #if 0
  457:     { /* let's see what the relocator did */
  458:       FILE *snapshot=fopen("snapshot.fi","wb");
  459:       fwrite(image,1,imagesize,snapshot);
  460:       fclose(snapshot);
  461:     }
  462: #endif
  463:   }
  464:   else if(header.base!=imp) {
  465:     fprintf(stderr,"%s: Cannot load nonrelocatable image (compiled for address $%lx) at address $%lx\n",
  466: 	    progname, (unsigned long)header.base, (unsigned long)imp);
  467:     exit(1);
  468:   }
  469:   if (header.checksum==0)
  470:     ((ImageHeader *)imp)->checksum=check_sum;
  471:   else if (header.checksum != check_sum) {
  472:     fprintf(stderr,"%s: Checksum of image ($%lx) does not match the executable ($%lx)\n",
  473: 	    progname, (unsigned long)(header.checksum),(unsigned long)check_sum);
  474:     exit(1);
  475:   }
  476:   fclose(imagefile);
  477: 
  478:   alloc_stacks((ImageHeader *)imp);
  479: 
  480:   CACHE_FLUSH(imp, header.image_size);
  481: 
  482:   return imp;
  483: }
  484: 
  485: /* index of last '/' or '\' in file, 0 if there is none. !! Hmm, could
  486:    be implemented with strrchr and the separator should be
  487:    OS-dependent */
  488: int onlypath(char *file)
  489: {
  490:   int i;
  491:   i=strlen(file);
  492:   while (i) {
  493:     if (file[i]=='\\' || file[i]=='/') break;
  494:     i--;
  495:   }
  496:   return i;
  497: }
  498: 
  499: FILE *openimage(char *fullfilename)
  500: {
  501:   FILE *image_file;
  502:   char * expfilename = tilde_cstr(fullfilename, strlen(fullfilename), 1);
  503: 
  504:   image_file=fopen(expfilename,"rb");
  505: #ifdef HAS_DEBUG
  506:   if (image_file!=NULL && debug)
  507:     fprintf(stderr, "Opened image file: %s\n", expfilename);
  508: #endif
  509:   return image_file;
  510: }
  511: 
  512: /* try to open image file concat(path[0:len],imagename) */
  513: FILE *checkimage(char *path, int len, char *imagename)
  514: {
  515:   int dirlen=len;
  516:   char fullfilename[dirlen+strlen(imagename)+2];
  517: 
  518:   memcpy(fullfilename, path, dirlen);
  519:   if (fullfilename[dirlen-1]!='/')
  520:     fullfilename[dirlen++]='/';
  521:   strcpy(fullfilename+dirlen,imagename);
  522:   return openimage(fullfilename);
  523: }
  524: 
  525: FILE * open_image_file(char * imagename, char * path)
  526: {
  527:   FILE * image_file=NULL;
  528:   char *origpath=path;
  529:   
  530:   if(strchr(imagename, '/')==NULL) {
  531:     /* first check the directory where the exe file is in !! 01may97jaw */
  532:     if (onlypath(progname))
  533:       image_file=checkimage(progname, onlypath(progname), imagename);
  534:     if (!image_file)
  535:       do {
  536: 	char *pend=strchr(path, PATHSEP);
  537: 	if (pend==NULL)
  538: 	  pend=path+strlen(path);
  539: 	if (strlen(path)==0) break;
  540: 	image_file=checkimage(path, pend-path, imagename);
  541: 	path=pend+(*pend==PATHSEP);
  542:       } while (image_file==NULL);
  543:   } else {
  544:     image_file=openimage(imagename);
  545:   }
  546: 
  547:   if (!image_file) {
  548:     fprintf(stderr,"%s: cannot open image file %s in path %s for reading\n",
  549: 	    progname, imagename, origpath);
  550:     exit(1);
  551:   }
  552: 
  553:   return image_file;
  554: }
  555: #endif
  556: 
  557: #ifdef HAS_OS
  558: UCell convsize(char *s, UCell elemsize)
  559: /* converts s of the format [0-9]+[bekMGT]? (e.g. 25k) into the number
  560:    of bytes.  the letter at the end indicates the unit, where e stands
  561:    for the element size. default is e */
  562: {
  563:   char *endp;
  564:   UCell n,m;
  565: 
  566:   m = elemsize;
  567:   n = strtoul(s,&endp,0);
  568:   if (endp!=NULL) {
  569:     if (strcmp(endp,"b")==0)
  570:       m=1;
  571:     else if (strcmp(endp,"k")==0)
  572:       m=1024;
  573:     else if (strcmp(endp,"M")==0)
  574:       m=1024*1024;
  575:     else if (strcmp(endp,"G")==0)
  576:       m=1024*1024*1024;
  577:     else if (strcmp(endp,"T")==0) {
  578: #if (SIZEOF_CHAR_P > 4)
  579:       m=1024L*1024*1024*1024;
  580: #else
  581:       fprintf(stderr,"%s: size specification \"%s\" too large for this machine\n", progname, endp);
  582:       exit(1);
  583: #endif
  584:     } else if (strcmp(endp,"e")!=0 && strcmp(endp,"")!=0) {
  585:       fprintf(stderr,"%s: cannot grok size specification %s: invalid unit \"%s\"\n", progname, s, endp);
  586:       exit(1);
  587:     }
  588:   }
  589:   return n*m;
  590: }
  591: 
  592: void gforth_args(int argc, char ** argv, char ** path, char ** imagename)
  593: {
  594:   int c;
  595: 
  596:   opterr=0;
  597:   while (1) {
  598:     int option_index=0;
  599:     static struct option opts[] = {
  600:       {"appl-image", required_argument, NULL, 'a'},
  601:       {"image-file", required_argument, NULL, 'i'},
  602:       {"dictionary-size", required_argument, NULL, 'm'},
  603:       {"data-stack-size", required_argument, NULL, 'd'},
  604:       {"return-stack-size", required_argument, NULL, 'r'},
  605:       {"fp-stack-size", required_argument, NULL, 'f'},
  606:       {"locals-stack-size", required_argument, NULL, 'l'},
  607:       {"path", required_argument, NULL, 'p'},
  608:       {"version", no_argument, NULL, 'v'},
  609:       {"help", no_argument, NULL, 'h'},
  610:       /* put something != 0 into offset_image */
  611:       {"offset-image", no_argument, &offset_image, 1},
  612:       {"no-offset-im", no_argument, &offset_image, 0},
  613:       {"clear-dictionary", no_argument, &clear_dictionary, 1},
  614:       {"die-on-signal", no_argument, &die_on_signal, 1},
  615:       {"debug", no_argument, &debug, 1},
  616:       {0,0,0,0}
  617:       /* no-init-file, no-rc? */
  618:     };
  619:     
  620:     c = getopt_long(argc, argv, "+i:m:d:r:f:l:p:vh", opts, &option_index);
  621:     
  622:     switch (c) {
  623:     case EOF: return;
  624:     case '?': optind--; return;
  625:     case 'a': *imagename = optarg; return;
  626:     case 'i': *imagename = optarg; break;
  627:     case 'm': dictsize = convsize(optarg,sizeof(Cell)); break;
  628:     case 'd': dsize = convsize(optarg,sizeof(Cell)); break;
  629:     case 'r': rsize = convsize(optarg,sizeof(Cell)); break;
  630:     case 'f': fsize = convsize(optarg,sizeof(Float)); break;
  631:     case 'l': lsize = convsize(optarg,sizeof(Cell)); break;
  632:     case 'p': *path = optarg; break;
  633:     case 'v': fprintf(stderr, "gforth %s\n", VERSION); exit(0);
  634:     case 'h': 
  635:       fprintf(stderr, "Usage: %s [engine options] ['--'] [image arguments]\n\
  636: Engine Options:\n\
  637:   --appl-image FILE		    equivalent to '--image-file=FILE --'\n\
  638:   --clear-dictionary		    Initialize the dictionary with 0 bytes\n\
  639:   -d SIZE, --data-stack-size=SIZE   Specify data stack size\n\
  640:   --debug			    Print debugging information during startup\n\
  641:   --die-on-signal		    exit instead of CATCHing some signals\n\
  642:   -f SIZE, --fp-stack-size=SIZE	    Specify floating point stack size\n\
  643:   -h, --help			    Print this message and exit\n\
  644:   -i FILE, --image-file=FILE	    Use image FILE instead of `gforth.fi'\n\
  645:   -l SIZE, --locals-stack-size=SIZE Specify locals stack size\n\
  646:   -m SIZE, --dictionary-size=SIZE   Specify Forth dictionary size\n\
  647:   --no-offset-im		    Load image at normal position\n\
  648:   --offset-image		    Load image at a different position\n\
  649:   -p PATH, --path=PATH		    Search path for finding image and sources\n\
  650:   -r SIZE, --return-stack-size=SIZE Specify return stack size\n\
  651:   -v, --version			    Print version and exit\n\
  652: SIZE arguments consist of an integer followed by a unit. The unit can be\n\
  653:   `b' (byte), `e' (element; default), `k' (KB), `M' (MB), `G' (GB) or `T' (TB).\n",
  654: 	      argv[0]);
  655:       optind--;
  656:       return;
  657:     }
  658:   }
  659: }
  660: #endif
  661: 
  662: #ifdef INCLUDE_IMAGE
  663: extern Cell image[];
  664: extern const char reloc_bits[];
  665: #endif
  666: 
  667: int main(int argc, char **argv, char **env)
  668: {
  669: #ifdef HAS_OS
  670:   char *path = getenv("GFORTHPATH") ? : DEFAULTPATH;
  671: #else
  672:   char *path = DEFAULTPATH;
  673: #endif
  674: #ifndef INCLUDE_IMAGE
  675:   char *imagename="gforth.fi";
  676:   FILE *image_file;
  677:   Address image;
  678: #endif
  679:   int retvalue;
  680: 	  
  681: #if defined(i386) && defined(ALIGNMENT_CHECK) && !defined(DIRECT_THREADED)
  682:   /* turn on alignment checks on the 486.
  683:    * on the 386 this should have no effect. */
  684:   __asm__("pushfl; popl %eax; orl $0x40000, %eax; pushl %eax; popfl;");
  685:   /* this is unusable with Linux' libc.4.6.27, because this library is
  686:      not alignment-clean; we would have to replace some library
  687:      functions (e.g., memcpy) to make it work. Also GCC doesn't try to keep
  688:      the stack FP-aligned. */
  689: #endif
  690: 
  691:   /* buffering of the user output device */
  692: #ifdef _IONBF
  693:   if (isatty(fileno(stdout))) {
  694:     fflush(stdout);
  695:     setvbuf(stdout,NULL,_IONBF,0);
  696:   }
  697: #endif
  698: 
  699:   progname = argv[0];
  700: 
  701: #ifdef HAS_OS
  702:   gforth_args(argc, argv, &path, &imagename);
  703: #endif
  704: 
  705: #ifdef INCLUDE_IMAGE
  706:   set_stack_sizes((ImageHeader *)image);
  707:   if(((ImageHeader *)image)->base != image)
  708:     relocate(image, reloc_bits, ((ImageHeader *)image)->image_size,
  709: 	     (Label*)engine(0, 0, 0, 0, 0));
  710:   alloc_stacks((ImageHeader *)image);
  711: #else
  712:   image_file = open_image_file(imagename, path);
  713:   image = loader(image_file, imagename);
  714: #endif
  715:   gforth_header=(ImageHeader *)image; /* used in SIGSEGV handler */
  716: 
  717:   {
  718:     char path2[strlen(path)+1];
  719:     char *p1, *p2;
  720:     Cell environ[]= {
  721:       (Cell)argc-(optind-1),
  722:       (Cell)(argv+(optind-1)),
  723:       (Cell)strlen(path),
  724:       (Cell)path2};
  725:     argv[optind-1] = progname;
  726:     /*
  727:        for (i=0; i<environ[0]; i++)
  728:        printf("%s\n", ((char **)(environ[1]))[i]);
  729:        */
  730:     /* make path OS-independent by replacing path separators with NUL */
  731:     for (p1=path, p2=path2; *p1!='\0'; p1++, p2++)
  732:       if (*p1==PATHSEP)
  733: 	*p2 = '\0';
  734:       else
  735: 	*p2 = *p1;
  736:     *p2='\0';
  737:     retvalue = go_forth(image, 4, environ);
  738:     deprep_terminal();
  739:   }
  740:   return retvalue;
  741: }

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