Annotation of gforth/engine/main.c, revision 1.40

1.1       anton       1: /* command line interpretation, image loading etc. for Gforth
                      2: 
                      3: 
1.39      anton       4:   Copyright (C) 1995,1996,1997,1998,2000 Free Software Foundation, Inc.
1.1       anton       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
1.40    ! anton      20:   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111, USA.
1.1       anton      21: */
                     22: 
                     23: #include "config.h"
                     24: #include <errno.h>
                     25: #include <ctype.h>
                     26: #include <stdio.h>
1.2       pazsan     27: #include <unistd.h>
1.1       anton      28: #include <string.h>
                     29: #include <math.h>
                     30: #include <sys/types.h>
1.32      pazsan     31: #ifndef STANDALONE
1.1       anton      32: #include <sys/stat.h>
1.32      pazsan     33: #endif
1.1       anton      34: #include <fcntl.h>
                     35: #include <assert.h>
                     36: #include <stdlib.h>
1.11      pazsan     37: #ifndef STANDALONE
1.1       anton      38: #if HAVE_SYS_MMAN_H
                     39: #include <sys/mman.h>
                     40: #endif
1.11      pazsan     41: #endif
1.1       anton      42: #include "forth.h"
                     43: #include "io.h"
                     44: #include "getopt.h"
1.11      pazsan     45: #ifdef STANDALONE
                     46: #include <systypes.h>
                     47: #endif
1.1       anton      48: 
                     49: #define PRIM_VERSION 1
                     50: /* increment this whenever the primitives change in an incompatible way */
                     51: 
1.14      pazsan     52: #ifndef DEFAULTPATH
1.39      anton      53: #  define DEFAULTPATH "."
1.14      pazsan     54: #endif
                     55: 
1.1       anton      56: #ifdef MSDOS
                     57: jmp_buf throw_jmp_buf;
                     58: #endif
                     59: 
                     60: #if defined(DIRECT_THREADED) 
                     61: #  define CA(n)        (symbols[(n)])
                     62: #else
                     63: #  define CA(n)        ((Cell)(symbols+(n)))
                     64: #endif
                     65: 
                     66: #define maxaligned(n)  (typeof(n))((((Cell)n)+sizeof(Float)-1)&-sizeof(Float))
                     67: 
                     68: static UCell dictsize=0;
                     69: static UCell dsize=0;
                     70: static UCell rsize=0;
                     71: static UCell fsize=0;
                     72: static UCell lsize=0;
                     73: int offset_image=0;
1.4       anton      74: int die_on_signal=0;
1.13      pazsan     75: #ifndef INCLUDE_IMAGE
1.1       anton      76: static int clear_dictionary=0;
1.24      anton      77: UCell pagesize=1;
1.22      pazsan     78: char *progname;
                     79: #else
                     80: char *progname = "gforth";
                     81: int optind = 1;
1.13      pazsan     82: #endif
1.31      pazsan     83: 
1.30      pazsan     84: #ifdef HAS_DEBUG
1.1       anton      85: static int debug=0;
1.31      pazsan     86: #else
                     87: # define debug 0
                     88: # define perror(x...)
                     89: # define fprintf(x...)
1.30      pazsan     90: #endif
1.31      pazsan     91: 
1.24      anton      92: ImageHeader *gforth_header;
1.1       anton      93: 
1.30      pazsan     94: #ifdef MEMCMP_AS_SUBROUTINE
                     95: int gforth_memcmp(const char * s1, const char * s2, size_t n)
                     96: {
                     97:   return memcmp(s1, s2, n);
                     98: }
                     99: #endif
                    100: 
1.1       anton     101: /* image file format:
1.15      pazsan    102:  *  "#! binary-path -i\n" (e.g., "#! /usr/local/bin/gforth-0.4.0 -i\n")
1.1       anton     103:  *   padding to a multiple of 8
1.15      pazsan    104:  *   magic: "Gforth2x" means format 0.4,
                    105:  *              where x is a byte with
                    106:  *              bit 7:   reserved = 0
                    107:  *              bit 6:5: address unit size 2^n octets
                    108:  *              bit 4:3: character size 2^n octets
                    109:  *              bit 2:1: cell size 2^n octets
                    110:  *              bit 0:   endian, big=0, little=1.
                    111:  *  The magic are always 8 octets, no matter what the native AU/character size is
1.1       anton     112:  *  padding to max alignment (no padding necessary on current machines)
1.24      anton     113:  *  ImageHeader structure (see forth.h)
1.1       anton     114:  *  data (size in ImageHeader.image_size)
                    115:  *  tags ((if relocatable, 1 bit/data cell)
                    116:  *
                    117:  * tag==1 means that the corresponding word is an address;
                    118:  * If the word is >=0, the address is within the image;
                    119:  * addresses within the image are given relative to the start of the image.
                    120:  * If the word =-1 (CF_NIL), the address is NIL,
                    121:  * If the word is <CF_NIL and >CF(DODOES), it's a CFA (:, Create, ...)
                    122:  * If the word =CF(DODOES), it's a DOES> CFA
                    123:  * If the word =CF(DOESJUMP), it's a DOES JUMP (2 Cells after DOES>,
                    124:  *                                     possibly containing a jump to dodoes)
                    125:  * If the word is <CF(DOESJUMP), it's a primitive
                    126:  */
                    127: 
1.10      pazsan    128: void relocate(Cell *image, const char *bitstring, int size, Label symbols[])
1.1       anton     129: {
1.16      pazsan    130:   int i=0, j, k, steps=(size/sizeof(Cell))/RELINFOBITS;
1.11      pazsan    131:   Cell token;
1.1       anton     132:   char bits;
1.37      anton     133:   Cell max_symbols;
1.1       anton     134: 
                    135: /*  printf("relocating %x[%x]\n", image, size); */
1.37      anton     136:   
                    137:   for (max_symbols=DOESJUMP+1; symbols[max_symbols]!=0; max_symbols++)
                    138:     ;
1.35      pazsan    139:   size/=sizeof(Cell);
                    140: 
1.31      pazsan    141:   for(k=0; k<=steps; k++) {
1.13      pazsan    142:     for(j=0, bits=bitstring[k]; j<RELINFOBITS; j++, i++, bits<<=1) {
1.1       anton     143:       /*      fprintf(stderr,"relocate: image[%d]\n", i);*/
1.35      pazsan    144:       if((i < size) && (bits & (1U << (RELINFOBITS-1)))) {
                    145:        /* fprintf(stderr,"relocate: image[%d]=%d of %d\n", i, image[i], size/sizeof(Cell)); */
1.11      pazsan    146:        if((token=image[i])<0)
                    147:          switch(token)
1.1       anton     148:            {
                    149:            case CF_NIL      : image[i]=0; break;
                    150: #if !defined(DOUBLY_INDIRECT)
                    151:            case CF(DOCOL)   :
                    152:            case CF(DOVAR)   :
                    153:            case CF(DOCON)   :
                    154:            case CF(DOUSER)  : 
                    155:            case CF(DODEFER) : 
1.11      pazsan    156:            case CF(DOFIELD) : MAKE_CF(image+i,symbols[CF(token)]); break;
1.1       anton     157:            case CF(DOESJUMP): MAKE_DOES_HANDLER(image+i); break;
                    158: #endif /* !defined(DOUBLY_INDIRECT) */
                    159:            case CF(DODOES)  :
1.33      anton     160:              MAKE_DOES_CF(image+i,(Xt *)(image[i+1]+((Cell)image)));
1.1       anton     161:              break;
                    162:            default          :
                    163: /*           printf("Code field generation image[%x]:=CA(%x)\n",
                    164:                     i, CF(image[i])); */
1.37      anton     165:              if (CF(token)<max_symbols)
                    166:                image[i]=(Cell)CA(CF(token));
                    167:              else
                    168:                fprintf(stderr,"Primitive %d used in this image at $%lx is not implemented by this\n engine (%s); executing this code will crash.\n",CF(token),(long)&image[i],VERSION);
1.1       anton     169:            }
                    170:        else
                    171:          image[i]+=(Cell)image;
                    172:       }
                    173:     }
1.31      pazsan    174:   }
1.26      jwilke    175:   ((ImageHeader*)(image))->base = (Address) image;
1.1       anton     176: }
                    177: 
                    178: UCell checksum(Label symbols[])
                    179: {
                    180:   UCell r=PRIM_VERSION;
                    181:   Cell i;
                    182: 
                    183:   for (i=DOCOL; i<=DOESJUMP; i++) {
                    184:     r ^= (UCell)(symbols[i]);
                    185:     r = (r << 5) | (r >> (8*sizeof(Cell)-5));
                    186:   }
                    187: #ifdef DIRECT_THREADED
                    188:   /* we have to consider all the primitives */
                    189:   for (; symbols[i]!=(Label)0; i++) {
                    190:     r ^= (UCell)(symbols[i]);
                    191:     r = (r << 5) | (r >> (8*sizeof(Cell)-5));
                    192:   }
                    193: #else
                    194:   /* in indirect threaded code all primitives are accessed through the
                    195:      symbols table, so we just have to put the base address of symbols
                    196:      in the checksum */
                    197:   r ^= (UCell)symbols;
                    198: #endif
                    199:   return r;
                    200: }
                    201: 
1.3       anton     202: Address verbose_malloc(Cell size)
                    203: {
                    204:   Address r;
                    205:   /* leave a little room (64B) for stack underflows */
                    206:   if ((r = malloc(size+64))==NULL) {
                    207:     perror(progname);
                    208:     exit(1);
                    209:   }
                    210:   r = (Address)((((Cell)r)+(sizeof(Float)-1))&(-sizeof(Float)));
                    211:   if (debug)
                    212:     fprintf(stderr, "malloc succeeds, address=$%lx\n", (long)r);
                    213:   return r;
                    214: }
                    215: 
1.33      anton     216: static Address next_address=0;
                    217: void after_alloc(Address r, Cell size)
                    218: {
                    219:   if (r != (Address)-1) {
                    220:     if (debug)
                    221:       fprintf(stderr, "success, address=$%lx\n", (long) r);
                    222:     if (pagesize != 1)
                    223:       next_address = (Address)(((((Cell)r)+size-1)&-pagesize)+2*pagesize); /* leave one page unmapped */
                    224:   } else {
                    225:     if (debug)
                    226:       fprintf(stderr, "failed: %s\n", strerror(errno));
                    227:   }
                    228: }
                    229: 
1.34      anton     230: #ifndef MAP_FAILED
                    231: #define MAP_FAILED ((Address) -1)
                    232: #endif
                    233: #ifndef MAP_FILE
                    234: # define MAP_FILE 0
                    235: #endif
                    236: #ifndef MAP_PRIVATE
                    237: # define MAP_PRIVATE 0
                    238: #endif
                    239: 
                    240: #if defined(HAVE_MMAP)
                    241: static Address alloc_mmap(Cell size)
1.1       anton     242: {
                    243:   Address r;
                    244: 
                    245: #if defined(MAP_ANON)
                    246:   if (debug)
                    247:     fprintf(stderr,"try mmap($%lx, $%lx, ..., MAP_ANON, ...); ", (long)next_address, (long)size);
1.34      anton     248:   r = mmap(next_address, size, PROT_EXEC|PROT_READ|PROT_WRITE, MAP_ANON|MAP_PRIVATE, -1, 0);
1.1       anton     249: #else /* !defined(MAP_ANON) */
1.17      anton     250:   /* Ultrix (at least) does not define MAP_FILE and MAP_PRIVATE (both are
                    251:      apparently defaults) */
1.1       anton     252:   static int dev_zero=-1;
                    253: 
                    254:   if (dev_zero == -1)
                    255:     dev_zero = open("/dev/zero", O_RDONLY);
                    256:   if (dev_zero == -1) {
1.34      anton     257:     r = MAP_FAILED;
1.1       anton     258:     if (debug)
                    259:       fprintf(stderr, "open(\"/dev/zero\"...) failed (%s), no mmap; ", 
                    260:              strerror(errno));
                    261:   } else {
                    262:     if (debug)
                    263:       fprintf(stderr,"try mmap($%lx, $%lx, ..., MAP_FILE, dev_zero, ...); ", (long)next_address, (long)size);
                    264:     r=mmap(next_address, size, PROT_EXEC|PROT_READ|PROT_WRITE, MAP_FILE|MAP_PRIVATE, dev_zero, 0);
                    265:   }
                    266: #endif /* !defined(MAP_ANON) */
1.34      anton     267:   after_alloc(r, size);
                    268:   return r;  
                    269: }
                    270: #endif
                    271: 
                    272: Address my_alloc(Cell size)
                    273: {
                    274: #if HAVE_MMAP
                    275:   Address r;
                    276: 
                    277:   r=alloc_mmap(size);
                    278:   if (r!=MAP_FAILED)
1.1       anton     279:     return r;
                    280: #endif /* HAVE_MMAP */
1.3       anton     281:   /* use malloc as fallback */
                    282:   return verbose_malloc(size);
1.1       anton     283: }
                    284: 
1.3       anton     285: #if (defined(mips) && !defined(INDIRECT_THREADED))
                    286: /* the 256MB jump restriction on the MIPS architecture makes the
                    287:    combination of direct threading and mmap unsafe. */
1.33      anton     288: #define mips_dict_alloc 1
1.3       anton     289: #define dict_alloc(size) verbose_malloc(size)
                    290: #else
                    291: #define dict_alloc(size) my_alloc(size)
                    292: #endif
                    293: 
1.34      anton     294: Address dict_alloc_read(FILE *file, Cell imagesize, Cell dictsize, Cell offset)
1.33      anton     295: {
1.34      anton     296:   Address image = MAP_FAILED;
1.33      anton     297: 
1.34      anton     298: #if defined(HAVE_MMAP) && !defined(mips_dict_alloc)
1.33      anton     299:   if (offset==0) {
1.34      anton     300:     image=alloc_mmap(dictsize);
1.33      anton     301:     if (debug)
1.34      anton     302:       fprintf(stderr,"try mmap($%lx, $%lx, ..., MAP_FIXED|MAP_FILE, imagefile, 0); ", (long)image, (long)imagesize);
                    303:     image = mmap(image, imagesize, PROT_EXEC|PROT_READ|PROT_WRITE, MAP_FIXED|MAP_FILE|MAP_PRIVATE, fileno(file), 0);
                    304:     after_alloc(image,dictsize);
1.33      anton     305:   }
1.34      anton     306: #endif /* defined(MAP_ANON) && !defined(mips_dict_alloc) */
                    307:   if (image == MAP_FAILED) {
                    308:     image = dict_alloc(dictsize+offset)+offset;
1.33      anton     309:     rewind(file);  /* fseek(imagefile,0L,SEEK_SET); */
1.34      anton     310:     fread(image, 1, imagesize, file);
1.33      anton     311:   }
                    312:   return image;
                    313: }
                    314: 
1.10      pazsan    315: void set_stack_sizes(ImageHeader * header)
                    316: {
                    317:   if (dictsize==0)
                    318:     dictsize = header->dict_size;
                    319:   if (dsize==0)
                    320:     dsize = header->data_stack_size;
                    321:   if (rsize==0)
                    322:     rsize = header->return_stack_size;
                    323:   if (fsize==0)
                    324:     fsize = header->fp_stack_size;
                    325:   if (lsize==0)
                    326:     lsize = header->locals_stack_size;
                    327:   dictsize=maxaligned(dictsize);
                    328:   dsize=maxaligned(dsize);
                    329:   rsize=maxaligned(rsize);
                    330:   lsize=maxaligned(lsize);
                    331:   fsize=maxaligned(fsize);
                    332: }
                    333: 
                    334: void alloc_stacks(ImageHeader * header)
                    335: {
                    336:   header->dict_size=dictsize;
                    337:   header->data_stack_size=dsize;
                    338:   header->fp_stack_size=fsize;
                    339:   header->return_stack_size=rsize;
                    340:   header->locals_stack_size=lsize;
                    341: 
                    342:   header->data_stack_base=my_alloc(dsize);
                    343:   header->fp_stack_base=my_alloc(fsize);
                    344:   header->return_stack_base=my_alloc(rsize);
                    345:   header->locals_stack_base=my_alloc(lsize);
                    346: }
                    347: 
1.11      pazsan    348: int go_forth(Address image, int stack, Cell *entries)
                    349: {
1.38      anton     350:   volatile ImageHeader *image_header = (ImageHeader *)image;
1.18      anton     351:   Cell *sp0=(Cell*)(image_header->data_stack_base + dsize);
                    352:   Float *fp0=(Float *)(image_header->fp_stack_base + fsize);
                    353:   Cell *rp0=(Cell *)(image_header->return_stack_base + rsize);
1.38      anton     354:   volatile Cell *orig_rp0=rp0;
1.18      anton     355:   Address lp0=image_header->locals_stack_base + lsize;
                    356:   Xt *ip0=(Xt *)(image_header->boot_entry);
1.13      pazsan    357: #ifdef SYSSIGNALS
1.11      pazsan    358:   int throw_code;
1.13      pazsan    359: #endif
1.11      pazsan    360: 
                    361:   /* ensure that the cached elements (if any) are accessible */
1.18      anton     362:   IF_TOS(sp0--);
                    363:   IF_FTOS(fp0--);
1.11      pazsan    364:   
                    365:   for(;stack>0;stack--)
1.18      anton     366:     *--sp0=entries[stack-1];
1.11      pazsan    367: 
1.30      pazsan    368: #ifdef SYSSIGNALS
1.11      pazsan    369:   get_winsize();
                    370:    
                    371:   install_signal_handlers(); /* right place? */
                    372:   
                    373:   if ((throw_code=setjmp(throw_jmp_buf))) {
                    374:     static Cell signal_data_stack[8];
                    375:     static Cell signal_return_stack[8];
                    376:     static Float signal_fp_stack[1];
1.13      pazsan    377: 
1.11      pazsan    378:     signal_data_stack[7]=throw_code;
1.18      anton     379: 
                    380: #ifdef GFORTH_DEBUGGING
1.38      anton     381:     /* fprintf(stderr,"\nrp=%ld\n",(long)rp); */
                    382:     if (rp <= orig_rp0 && rp > (Cell *)(image_header->return_stack_base+5)) {
1.18      anton     383:       /* no rstack overflow or underflow */
                    384:       rp0 = rp;
1.27      anton     385:       *--rp0 = (Cell)ip;
1.18      anton     386:     }
                    387:     else /* I love non-syntactic ifdefs :-) */
                    388: #endif
                    389:     rp0 = signal_return_stack+8;
1.25      anton     390:     /* fprintf(stderr, "rp=$%x\n",rp0);*/
1.11      pazsan    391:     
1.33      anton     392:     return((int)(Cell)engine(image_header->throw_entry, signal_data_stack+7,
1.18      anton     393:                       rp0, signal_fp_stack, 0));
1.11      pazsan    394:   }
1.13      pazsan    395: #endif
1.11      pazsan    396: 
1.33      anton     397:   return((int)(Cell)engine(ip0,sp0,rp0,fp0,lp0));
1.11      pazsan    398: }
                    399: 
1.21      anton     400: 
1.30      pazsan    401: #ifndef INCLUDE_IMAGE
1.21      anton     402: void print_sizes(Cell sizebyte)
                    403:      /* print size information */
                    404: {
                    405:   static char* endianstring[]= { "   big","little" };
                    406:   
                    407:   fprintf(stderr,"%s endian, cell=%d bytes, char=%d bytes, au=%d bytes\n",
                    408:          endianstring[sizebyte & 1],
                    409:          1 << ((sizebyte >> 1) & 3),
                    410:          1 << ((sizebyte >> 3) & 3),
                    411:          1 << ((sizebyte >> 5) & 3));
                    412: }
                    413: 
1.1       anton     414: Address loader(FILE *imagefile, char* filename)
                    415: /* returns the address of the image proper (after the preamble) */
                    416: {
                    417:   ImageHeader header;
                    418:   Address image;
                    419:   Address imp; /* image+preamble */
1.17      anton     420:   Char magic[8];
                    421:   char magic7; /* size byte of magic number */
1.1       anton     422:   Cell preamblesize=0;
                    423:   Label *symbols = engine(0,0,0,0,0);
1.6       pazsan    424:   Cell data_offset = offset_image ? 56*sizeof(Cell) : 0;
1.1       anton     425:   UCell check_sum;
1.15      pazsan    426:   Cell ausize = ((RELINFOBITS ==  8) ? 0 :
                    427:                 (RELINFOBITS == 16) ? 1 :
                    428:                 (RELINFOBITS == 32) ? 2 : 3);
                    429:   Cell charsize = ((sizeof(Char) == 1) ? 0 :
                    430:                   (sizeof(Char) == 2) ? 1 :
                    431:                   (sizeof(Char) == 4) ? 2 : 3) + ausize;
                    432:   Cell cellsize = ((sizeof(Cell) == 1) ? 0 :
                    433:                   (sizeof(Cell) == 2) ? 1 :
                    434:                   (sizeof(Cell) == 4) ? 2 : 3) + ausize;
1.21      anton     435:   Cell sizebyte = (ausize << 5) + (charsize << 3) + (cellsize << 1) +
                    436: #ifdef WORDS_BIGENDIAN
                    437:        0
                    438: #else
                    439:        1
                    440: #endif
                    441:     ;
1.1       anton     442: 
                    443: #ifndef DOUBLY_INDIRECT
                    444:   check_sum = checksum(symbols);
                    445: #else /* defined(DOUBLY_INDIRECT) */
                    446:   check_sum = (UCell)symbols;
                    447: #endif /* defined(DOUBLY_INDIRECT) */
1.10      pazsan    448:   
                    449:   do {
                    450:     if(fread(magic,sizeof(Char),8,imagefile) < 8) {
1.15      pazsan    451:       fprintf(stderr,"%s: image %s doesn't seem to be a Gforth (>=0.4) image.\n",
1.10      pazsan    452:              progname, filename);
                    453:       exit(1);
1.1       anton     454:     }
1.10      pazsan    455:     preamblesize+=8;
1.15      pazsan    456:   } while(memcmp(magic,"Gforth2",7));
1.17      anton     457:   magic7 = magic[7];
1.1       anton     458:   if (debug) {
1.17      anton     459:     magic[7]='\0';
1.21      anton     460:     fprintf(stderr,"Magic found: %s ", magic);
                    461:     print_sizes(magic7);
1.1       anton     462:   }
                    463: 
1.21      anton     464:   if (magic7 != sizebyte)
                    465:     {
                    466:       fprintf(stderr,"This image is:         ");
                    467:       print_sizes(magic7);
                    468:       fprintf(stderr,"whereas the machine is ");
                    469:       print_sizes(sizebyte);
1.1       anton     470:       exit(-2);
                    471:     };
                    472: 
                    473:   fread((void *)&header,sizeof(ImageHeader),1,imagefile);
1.10      pazsan    474: 
                    475:   set_stack_sizes(&header);
1.1       anton     476:   
                    477: #if HAVE_GETPAGESIZE
                    478:   pagesize=getpagesize(); /* Linux/GNU libc offers this */
                    479: #elif HAVE_SYSCONF && defined(_SC_PAGESIZE)
                    480:   pagesize=sysconf(_SC_PAGESIZE); /* POSIX.4 */
                    481: #elif PAGESIZE
                    482:   pagesize=PAGESIZE; /* in limits.h according to Gallmeister's POSIX.4 book */
                    483: #endif
                    484:   if (debug)
1.5       jwilke    485:     fprintf(stderr,"pagesize=%ld\n",(unsigned long) pagesize);
1.1       anton     486: 
1.34      anton     487:   image = dict_alloc_read(imagefile, preamblesize+header.image_size,
                    488:                          preamblesize+dictsize, data_offset);
1.33      anton     489:   imp=image+preamblesize;
1.1       anton     490:   if (clear_dictionary)
1.33      anton     491:     memset(imp+header.image_size, 0, dictsize-header.image_size);
1.1       anton     492:   if(header.base==0) {
                    493:     Cell reloc_size=((header.image_size-1)/sizeof(Cell))/8+1;
                    494:     char reloc_bits[reloc_size];
1.33      anton     495:     fseek(imagefile, preamblesize+header.image_size, SEEK_SET);
1.10      pazsan    496:     fread(reloc_bits, 1, reloc_size, imagefile);
                    497:     relocate((Cell *)imp, reloc_bits, header.image_size, symbols);
1.1       anton     498: #if 0
                    499:     { /* let's see what the relocator did */
                    500:       FILE *snapshot=fopen("snapshot.fi","wb");
                    501:       fwrite(image,1,imagesize,snapshot);
                    502:       fclose(snapshot);
                    503:     }
                    504: #endif
                    505:   }
                    506:   else if(header.base!=imp) {
                    507:     fprintf(stderr,"%s: Cannot load nonrelocatable image (compiled for address $%lx) at address $%lx\n",
                    508:            progname, (unsigned long)header.base, (unsigned long)imp);
                    509:     exit(1);
                    510:   }
                    511:   if (header.checksum==0)
                    512:     ((ImageHeader *)imp)->checksum=check_sum;
                    513:   else if (header.checksum != check_sum) {
                    514:     fprintf(stderr,"%s: Checksum of image ($%lx) does not match the executable ($%lx)\n",
                    515:            progname, (unsigned long)(header.checksum),(unsigned long)check_sum);
                    516:     exit(1);
                    517:   }
                    518:   fclose(imagefile);
                    519: 
1.10      pazsan    520:   alloc_stacks((ImageHeader *)imp);
1.1       anton     521: 
                    522:   CACHE_FLUSH(imp, header.image_size);
                    523: 
                    524:   return imp;
                    525: }
                    526: 
1.28      anton     527: /* index of last '/' or '\' in file, 0 if there is none. !! Hmm, could
                    528:    be implemented with strrchr and the separator should be
                    529:    OS-dependent */
1.1       anton     530: int onlypath(char *file)
1.10      pazsan    531: {
                    532:   int i;
1.1       anton     533:   i=strlen(file);
1.10      pazsan    534:   while (i) {
                    535:     if (file[i]=='\\' || file[i]=='/') break;
                    536:     i--;
                    537:   }
                    538:   return i;
1.1       anton     539: }
                    540: 
                    541: FILE *openimage(char *fullfilename)
1.10      pazsan    542: {
                    543:   FILE *image_file;
1.28      anton     544:   char * expfilename = tilde_cstr(fullfilename, strlen(fullfilename), 1);
1.10      pazsan    545: 
1.28      anton     546:   image_file=fopen(expfilename,"rb");
1.1       anton     547:   if (image_file!=NULL && debug)
1.28      anton     548:     fprintf(stderr, "Opened image file: %s\n", expfilename);
1.10      pazsan    549:   return image_file;
1.1       anton     550: }
                    551: 
1.28      anton     552: /* try to open image file concat(path[0:len],imagename) */
1.1       anton     553: FILE *checkimage(char *path, int len, char *imagename)
1.10      pazsan    554: {
                    555:   int dirlen=len;
1.1       anton     556:   char fullfilename[dirlen+strlen(imagename)+2];
1.10      pazsan    557: 
1.1       anton     558:   memcpy(fullfilename, path, dirlen);
                    559:   if (fullfilename[dirlen-1]!='/')
                    560:     fullfilename[dirlen++]='/';
                    561:   strcpy(fullfilename+dirlen,imagename);
1.10      pazsan    562:   return openimage(fullfilename);
1.1       anton     563: }
                    564: 
1.10      pazsan    565: FILE * open_image_file(char * imagename, char * path)
1.1       anton     566: {
1.10      pazsan    567:   FILE * image_file=NULL;
1.28      anton     568:   char *origpath=path;
1.10      pazsan    569:   
                    570:   if(strchr(imagename, '/')==NULL) {
                    571:     /* first check the directory where the exe file is in !! 01may97jaw */
                    572:     if (onlypath(progname))
                    573:       image_file=checkimage(progname, onlypath(progname), imagename);
                    574:     if (!image_file)
                    575:       do {
                    576:        char *pend=strchr(path, PATHSEP);
                    577:        if (pend==NULL)
                    578:          pend=path+strlen(path);
                    579:        if (strlen(path)==0) break;
                    580:        image_file=checkimage(path, pend-path, imagename);
                    581:        path=pend+(*pend==PATHSEP);
                    582:       } while (image_file==NULL);
                    583:   } else {
                    584:     image_file=openimage(imagename);
                    585:   }
1.1       anton     586: 
1.10      pazsan    587:   if (!image_file) {
                    588:     fprintf(stderr,"%s: cannot open image file %s in path %s for reading\n",
1.28      anton     589:            progname, imagename, origpath);
1.10      pazsan    590:     exit(1);
1.7       anton     591:   }
                    592: 
1.10      pazsan    593:   return image_file;
                    594: }
1.11      pazsan    595: #endif
                    596: 
                    597: #ifdef HAS_OS
                    598: UCell convsize(char *s, UCell elemsize)
                    599: /* converts s of the format [0-9]+[bekMGT]? (e.g. 25k) into the number
                    600:    of bytes.  the letter at the end indicates the unit, where e stands
                    601:    for the element size. default is e */
                    602: {
                    603:   char *endp;
                    604:   UCell n,m;
                    605: 
                    606:   m = elemsize;
                    607:   n = strtoul(s,&endp,0);
                    608:   if (endp!=NULL) {
                    609:     if (strcmp(endp,"b")==0)
                    610:       m=1;
                    611:     else if (strcmp(endp,"k")==0)
                    612:       m=1024;
                    613:     else if (strcmp(endp,"M")==0)
                    614:       m=1024*1024;
                    615:     else if (strcmp(endp,"G")==0)
                    616:       m=1024*1024*1024;
                    617:     else if (strcmp(endp,"T")==0) {
                    618: #if (SIZEOF_CHAR_P > 4)
1.24      anton     619:       m=1024L*1024*1024*1024;
1.11      pazsan    620: #else
                    621:       fprintf(stderr,"%s: size specification \"%s\" too large for this machine\n", progname, endp);
                    622:       exit(1);
                    623: #endif
                    624:     } else if (strcmp(endp,"e")!=0 && strcmp(endp,"")!=0) {
                    625:       fprintf(stderr,"%s: cannot grok size specification %s: invalid unit \"%s\"\n", progname, s, endp);
                    626:       exit(1);
                    627:     }
                    628:   }
                    629:   return n*m;
                    630: }
1.10      pazsan    631: 
                    632: void gforth_args(int argc, char ** argv, char ** path, char ** imagename)
                    633: {
                    634:   int c;
                    635: 
1.1       anton     636:   opterr=0;
                    637:   while (1) {
                    638:     int option_index=0;
                    639:     static struct option opts[] = {
1.29      anton     640:       {"appl-image", required_argument, NULL, 'a'},
1.1       anton     641:       {"image-file", required_argument, NULL, 'i'},
                    642:       {"dictionary-size", required_argument, NULL, 'm'},
                    643:       {"data-stack-size", required_argument, NULL, 'd'},
                    644:       {"return-stack-size", required_argument, NULL, 'r'},
                    645:       {"fp-stack-size", required_argument, NULL, 'f'},
                    646:       {"locals-stack-size", required_argument, NULL, 'l'},
                    647:       {"path", required_argument, NULL, 'p'},
                    648:       {"version", no_argument, NULL, 'v'},
                    649:       {"help", no_argument, NULL, 'h'},
                    650:       /* put something != 0 into offset_image */
                    651:       {"offset-image", no_argument, &offset_image, 1},
                    652:       {"no-offset-im", no_argument, &offset_image, 0},
                    653:       {"clear-dictionary", no_argument, &clear_dictionary, 1},
1.4       anton     654:       {"die-on-signal", no_argument, &die_on_signal, 1},
1.1       anton     655:       {"debug", no_argument, &debug, 1},
                    656:       {0,0,0,0}
                    657:       /* no-init-file, no-rc? */
                    658:     };
                    659:     
1.36      pazsan    660:     c = getopt_long(argc, argv, "+i:m:d:r:f:l:p:vhoncsx", opts, &option_index);
1.1       anton     661:     
                    662:     switch (c) {
1.29      anton     663:     case EOF: return;
                    664:     case '?': optind--; return;
                    665:     case 'a': *imagename = optarg; return;
1.10      pazsan    666:     case 'i': *imagename = optarg; break;
1.1       anton     667:     case 'm': dictsize = convsize(optarg,sizeof(Cell)); break;
                    668:     case 'd': dsize = convsize(optarg,sizeof(Cell)); break;
                    669:     case 'r': rsize = convsize(optarg,sizeof(Cell)); break;
                    670:     case 'f': fsize = convsize(optarg,sizeof(Float)); break;
                    671:     case 'l': lsize = convsize(optarg,sizeof(Cell)); break;
1.10      pazsan    672:     case 'p': *path = optarg; break;
1.36      pazsan    673:     case 'o': offset_image = 1; break;
                    674:     case 'n': offset_image = 0; break;
                    675:     case 'c': clear_dictionary = 1; break;
                    676:     case 's': die_on_signal = 1; break;
                    677:     case 'x': debug = 1; break;
1.8       anton     678:     case 'v': fprintf(stderr, "gforth %s\n", VERSION); exit(0);
1.1       anton     679:     case 'h': 
1.29      anton     680:       fprintf(stderr, "Usage: %s [engine options] ['--'] [image arguments]\n\
1.1       anton     681: Engine Options:\n\
1.29      anton     682:   --appl-image FILE                equivalent to '--image-file=FILE --'\n\
1.10      pazsan    683:   --clear-dictionary               Initialize the dictionary with 0 bytes\n\
                    684:   -d SIZE, --data-stack-size=SIZE   Specify data stack size\n\
                    685:   --debug                          Print debugging information during startup\n\
                    686:   --die-on-signal                  exit instead of CATCHing some signals\n\
                    687:   -f SIZE, --fp-stack-size=SIZE            Specify floating point stack size\n\
                    688:   -h, --help                       Print this message and exit\n\
                    689:   -i FILE, --image-file=FILE       Use image FILE instead of `gforth.fi'\n\
                    690:   -l SIZE, --locals-stack-size=SIZE Specify locals stack size\n\
                    691:   -m SIZE, --dictionary-size=SIZE   Specify Forth dictionary size\n\
                    692:   --no-offset-im                   Load image at normal position\n\
                    693:   --offset-image                   Load image at a different position\n\
                    694:   -p PATH, --path=PATH             Search path for finding image and sources\n\
                    695:   -r SIZE, --return-stack-size=SIZE Specify return stack size\n\
                    696:   -v, --version                            Print version and exit\n\
1.1       anton     697: SIZE arguments consist of an integer followed by a unit. The unit can be\n\
1.10      pazsan    698:   `b' (byte), `e' (element; default), `k' (KB), `M' (MB), `G' (GB) or `T' (TB).\n",
                    699:              argv[0]);
                    700:       optind--;
                    701:       return;
1.1       anton     702:     }
                    703:   }
1.10      pazsan    704: }
1.11      pazsan    705: #endif
1.10      pazsan    706: 
                    707: #ifdef INCLUDE_IMAGE
                    708: extern Cell image[];
                    709: extern const char reloc_bits[];
                    710: #endif
                    711: 
                    712: int main(int argc, char **argv, char **env)
                    713: {
1.30      pazsan    714: #ifdef HAS_OS
1.10      pazsan    715:   char *path = getenv("GFORTHPATH") ? : DEFAULTPATH;
1.30      pazsan    716: #else
                    717:   char *path = DEFAULTPATH;
                    718: #endif
1.13      pazsan    719: #ifndef INCLUDE_IMAGE
1.10      pazsan    720:   char *imagename="gforth.fi";
                    721:   FILE *image_file;
                    722:   Address image;
                    723: #endif
                    724:   int retvalue;
                    725:          
                    726: #if defined(i386) && defined(ALIGNMENT_CHECK) && !defined(DIRECT_THREADED)
                    727:   /* turn on alignment checks on the 486.
                    728:    * on the 386 this should have no effect. */
                    729:   __asm__("pushfl; popl %eax; orl $0x40000, %eax; pushl %eax; popfl;");
                    730:   /* this is unusable with Linux' libc.4.6.27, because this library is
                    731:      not alignment-clean; we would have to replace some library
                    732:      functions (e.g., memcpy) to make it work. Also GCC doesn't try to keep
                    733:      the stack FP-aligned. */
                    734: #endif
                    735: 
                    736:   /* buffering of the user output device */
1.11      pazsan    737: #ifdef _IONBF
1.10      pazsan    738:   if (isatty(fileno(stdout))) {
                    739:     fflush(stdout);
                    740:     setvbuf(stdout,NULL,_IONBF,0);
1.1       anton     741:   }
1.11      pazsan    742: #endif
1.1       anton     743: 
1.10      pazsan    744:   progname = argv[0];
                    745: 
1.11      pazsan    746: #ifdef HAS_OS
1.10      pazsan    747:   gforth_args(argc, argv, &path, &imagename);
1.11      pazsan    748: #endif
1.10      pazsan    749: 
                    750: #ifdef INCLUDE_IMAGE
                    751:   set_stack_sizes((ImageHeader *)image);
1.22      pazsan    752:   if(((ImageHeader *)image)->base != image)
                    753:     relocate(image, reloc_bits, ((ImageHeader *)image)->image_size,
                    754:             (Label*)engine(0, 0, 0, 0, 0));
1.10      pazsan    755:   alloc_stacks((ImageHeader *)image);
                    756: #else
                    757:   image_file = open_image_file(imagename, path);
                    758:   image = loader(image_file, imagename);
                    759: #endif
1.24      anton     760:   gforth_header=(ImageHeader *)image; /* used in SIGSEGV handler */
1.1       anton     761: 
                    762:   {
1.10      pazsan    763:     char path2[strlen(path)+1];
1.1       anton     764:     char *p1, *p2;
                    765:     Cell environ[]= {
                    766:       (Cell)argc-(optind-1),
                    767:       (Cell)(argv+(optind-1)),
1.10      pazsan    768:       (Cell)strlen(path),
1.1       anton     769:       (Cell)path2};
                    770:     argv[optind-1] = progname;
                    771:     /*
                    772:        for (i=0; i<environ[0]; i++)
                    773:        printf("%s\n", ((char **)(environ[1]))[i]);
                    774:        */
                    775:     /* make path OS-independent by replacing path separators with NUL */
1.10      pazsan    776:     for (p1=path, p2=path2; *p1!='\0'; p1++, p2++)
1.1       anton     777:       if (*p1==PATHSEP)
                    778:        *p2 = '\0';
                    779:       else
                    780:        *p2 = *p1;
                    781:     *p2='\0';
1.10      pazsan    782:     retvalue = go_forth(image, 4, environ);
1.1       anton     783:     deprep_terminal();
                    784:   }
1.13      pazsan    785:   return retvalue;
1.1       anton     786: }

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