Annotation of gforth/main.c, revision 1.31

1.30      anton       1: /* command line interpretation, image loading etc. for Gforth
                      2: 
                      3: 
                      4:   Copyright (C) 1995 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.
1.1       anton      21: */
                     22: 
                     23: #include <ctype.h>
                     24: #include <stdio.h>
                     25: #include <string.h>
                     26: #include <math.h>
                     27: #include <sys/types.h>
                     28: #include <sys/stat.h>
                     29: #include <fcntl.h>
                     30: #include <assert.h>
                     31: #include <stdlib.h>
                     32: #include "forth.h"
1.5       pazsan     33: #include "io.h"
1.20      anton      34: #include "getopt.h"
1.2       pazsan     35: 
1.22      pazsan     36: #ifdef MSDOS
                     37: jmp_buf throw_jmp_buf;
                     38: #endif
                     39: 
1.10      anton      40: #ifndef DEFAULTPATH
1.16      pazsan     41: #  define DEFAULTPATH "/usr/local/lib/gforth:."
1.10      anton      42: #endif
                     43: 
1.1       anton      44: #ifdef DIRECT_THREADED
1.16      pazsan     45: #  define CA(n)        (symbols[(n)])
1.1       anton      46: #else
1.21      pazsan     47: #  define CA(n)        ((Cell)(symbols+(n)))
1.1       anton      48: #endif
                     49: 
1.23      pazsan     50: #define maxaligned(n)  (typeof(n))((((Cell)n)+sizeof(Float)-1)&-sizeof(Float))
1.10      anton      51: 
1.21      pazsan     52: static Cell dictsize=0;
                     53: static Cell dsize=0;
                     54: static Cell rsize=0;
                     55: static Cell fsize=0;
                     56: static Cell lsize=0;
1.10      anton      57: char *progname;
                     58: 
                     59: 
1.1       anton      60: /* image file format:
1.18      pazsan     61:  *   preamble (is skipped off), size multiple of 8
                     62:  *   magig: "gforth00" (means format version 0.0)
1.25      pazsan     63:  *   "gforth0x" means format 0.1,
                     64:  *              whereas x in 2 4 8 for big endian and 3 5 9 for little endian
                     65:  *              and x & -2 is the size of the cell in byte.
1.1       anton      66:  *   size of image with stacks without tags (in bytes)
                     67:  *   size of image without stacks and tags (in bytes)
1.5       pazsan     68:  *   size of data and FP stack (in bytes)
1.1       anton      69:  *   pointer to start of code
1.7       anton      70:  *   pointer into throw (for signal handling)
1.16      pazsan     71:  *   pointer to dictionary
1.1       anton      72:  *   data (size in image[1])
                     73:  *   tags (1 bit/data cell)
                     74:  *
                     75:  * tag==1 mean that the corresponding word is an address;
                     76:  * If the word is >=0, the address is within the image;
                     77:  * addresses within the image are given relative to the start of the image.
                     78:  * If the word is =-1, the address is NIL,
1.2       pazsan     79:  * If the word is between -2 and -5, it's a CFA (:, Create, Constant, User)
1.24      pazsan     80:  * If the word is -7, it's a DOES> CFA
                     81:  * If the word is -8, it's a DOES JUMP
                     82:  * If the word is <-9, it's a primitive
1.1       anton      83:  */
                     84: 
1.10      anton      85: void relocate(Cell *image, char *bitstring, int size, Label symbols[])
1.1       anton      86: {
1.16      pazsan     87:   int i=0, j, k, steps=(size/sizeof(Cell))/8;
                     88:   char bits;
1.5       pazsan     89: /*   static char bits[8]={0x80,0x40,0x20,0x10,0x08,0x04,0x02,0x01};*/
                     90:    
1.16      pazsan     91:   for(k=0; k<=steps; k++)
                     92:     for(j=0, bits=bitstring[k]; j<8; j++, i++, bits<<=1)
                     93:       if(bits & 0x80)
                     94:        if(image[i]<0)
                     95:          switch(image[i])
                     96:            {
                     97:            case CF_NIL      : image[i]=0; break;
                     98:            case CF(DOCOL)   :
                     99:            case CF(DOVAR)   :
                    100:            case CF(DOCON)   :
                    101:            case CF(DOUSER)  : 
1.24      pazsan    102:            case CF(DODEFER) : 
1.28      anton     103:            case CF(DOFIELD) : MAKE_CF(image+i,symbols[CF(image[i])]); break;
1.21      pazsan    104:            case CF(DODOES)  : MAKE_DOES_CF(image+i,image[i+1]+((Cell)image));
1.16      pazsan    105:              break;
                    106:            case CF(DOESJUMP): MAKE_DOES_HANDLER(image+i); break;
                    107:            default          : image[i]=(Cell)CA(CF(image[i]));
                    108:            }
                    109:        else
                    110:          image[i]+=(Cell)image;
1.1       anton     111: }
                    112: 
1.10      anton     113: Cell *loader(FILE *imagefile)
                    114: {
1.16      pazsan    115:   Cell header[3];
                    116:   Cell *image;
1.18      pazsan    117:   Char magic[8];
1.16      pazsan    118:   int wholesize;
                    119:   int imagesize; /* everything needed by the image */
1.18      pazsan    120: 
1.25      pazsan    121:   static char* endsize[10]=
                    122:     {
                    123:       "no size information", "",
                    124:       "16 bit big endian", "16 bit little endian",
                    125:       "32 bit big endian", "32 bit little endian",
                    126:       "n/n", "n/n",
                    127:       "64 bit big endian", "64 bit little endian",
                    128:     };
                    129: 
1.18      pazsan    130:   do
                    131:     {
                    132:       if(fread(magic,sizeof(Char),8,imagefile) < 8) {
1.25      pazsan    133:        fprintf(stderr,"This image doesn't seem to be a gforth image.\n");
1.18      pazsan    134:        exit(1);
                    135:       }
                    136: #ifdef DEBUG
                    137:       printf("Magic found: %s\n",magic);
                    138: #endif
                    139:     }
1.25      pazsan    140:   while(memcmp(magic,"gforth0",7));
                    141:   
                    142:   if(!(magic[7]=='0' || magic[7] == sizeof(Cell) +
                    143: #ifdef WORDS_BIGENDIAN
                    144:        '0'
                    145: #else
                    146:        '1'
                    147: #endif
                    148:        ))
                    149:     { fprintf(stderr,"This image is %s, whereas the machine is %s.\n",
                    150:              endsize[magic[7]-'0'],
                    151:              endsize[sizeof(Cell) +
                    152: #ifdef WORDS_BIGENDIAN
                    153:                      0
                    154: #else
                    155:                      1
                    156: #endif
                    157:                      ]);
                    158:       exit(-2);
                    159:     };
1.18      pazsan    160: 
                    161:   fread(header,sizeof(Cell),3,imagefile);
1.16      pazsan    162:   if (dictsize==0)
                    163:     dictsize = header[0];
                    164:   if (dsize==0)
                    165:     dsize=header[2];
                    166:   if (rsize==0)
                    167:     rsize=header[2];
                    168:   if (fsize==0)
                    169:     fsize=header[2];
                    170:   if (lsize==0)
                    171:     lsize=header[2];
                    172:   dictsize=maxaligned(dictsize);
                    173:   dsize=maxaligned(dsize);
                    174:   rsize=maxaligned(rsize);
                    175:   lsize=maxaligned(lsize);
                    176:   fsize=maxaligned(fsize);
                    177:   
                    178:   wholesize = dictsize+dsize+rsize+fsize+lsize;
                    179:   imagesize = header[1]+((header[1]-1)/sizeof(Cell))/8+1;
1.23      pazsan    180:   image=malloc((wholesize>imagesize?wholesize:imagesize)+sizeof(Float));
                    181:   image = maxaligned(image);
1.16      pazsan    182:   memset(image,0,wholesize); /* why? - anton */
                    183:   image[0]=header[0];
                    184:   image[1]=header[1];
                    185:   image[2]=header[2];
                    186:   
                    187:   fread(image+3,1,header[1]-3*sizeof(Cell),imagefile);
                    188:   fread(((void *)image)+header[1],1,((header[1]-1)/sizeof(Cell))/8+1,
                    189:        imagefile);
                    190:   fclose(imagefile);
                    191:   
                    192:   if(image[5]==0) {
                    193:     relocate(image,(char *)image+header[1],header[1],engine(0,0,0,0,0));
                    194:   }
                    195:   else if(image[5]!=(Cell)image) {
1.28      anton     196:     fprintf(stderr,"%s: Cannot load nonrelocatable image (compiled for address 0x%lx) at address 0x%lx\nThe Gforth installer should look into the INSTALL file\n", progname, image[5], (Cell)image);
1.16      pazsan    197:     exit(1);
                    198:   }
1.1       anton     199: 
1.16      pazsan    200:   CACHE_FLUSH(image,image[1]);
                    201:   
                    202:   return(image);
1.1       anton     203: }
                    204: 
1.10      anton     205: int go_forth(Cell *image, int stack, Cell *entries)
1.1       anton     206: {
1.15      anton     207:   Cell *sp=(Cell*)((void *)image+dictsize+dsize);
                    208:   Address lp=(Address)((void *)sp+lsize);
                    209:   Float *fp=(Float *)((void *)lp+fsize);
                    210:   Cell *rp=(Cell*)((void *)fp+rsize);
1.21      pazsan    211:   Xt *ip=(Xt *)((Cell)image[3]);
1.15      anton     212:   int throw_code;
                    213:   
                    214:   for(;stack>0;stack--)
                    215:     *--sp=entries[stack-1];
                    216:   
                    217:   install_signal_handlers(); /* right place? */
                    218:   
                    219:   if ((throw_code=setjmp(throw_jmp_buf))) {
                    220:     static Cell signal_data_stack[8];
                    221:     static Cell signal_return_stack[8];
                    222:     static Float signal_fp_stack[1];
                    223:     
                    224:     signal_data_stack[7]=throw_code;
                    225:     
                    226:     return((int)engine((Xt *)image[4],signal_data_stack+7,
                    227:                       signal_return_stack+8,signal_fp_stack,0));
                    228:   }
                    229:   
                    230:   return((int)engine(ip,sp,rp,fp,lp));
1.1       anton     231: }
                    232: 
1.10      anton     233: int convsize(char *s, int elemsize)
                    234: /* converts s of the format #+u (e.g. 25k) into the number of bytes.
                    235:    the unit u can be one of bekM, where e stands for the element
                    236:    size. default is e */
                    237: {
                    238:   char *endp;
                    239:   int n,m;
                    240: 
                    241:   m = elemsize;
                    242:   n = strtoul(s,&endp,0);
                    243:   if (endp!=NULL) {
                    244:     if (strcmp(endp,"b")==0)
                    245:       m=1;
                    246:     else if (strcmp(endp,"k")==0)
                    247:       m=1024;
                    248:     else if (strcmp(endp,"M")==0)
                    249:       m=1024*1024;
1.31    ! anton     250:     else if (strcmp(endp,"e")!=0 && strcmp(endp,"")!=0) {
        !           251:       fprintf(stderr,"%s: cannot grok size specification %s: invalid unit \"%s\"\n", progname, s, endp);
1.10      anton     252:       exit(1);
                    253:     }
                    254:   }
                    255:   return n*m;
                    256: }
                    257: 
1.1       anton     258: int main(int argc, char **argv, char **env)
                    259: {
1.16      pazsan    260:   char *path, *path1;
                    261:   char *imagename="gforth.fi";
                    262:   FILE *image_file;
                    263:   int c, retvalue;
1.10      anton     264:          
1.14      anton     265: #if defined(i386) && defined(ALIGNMENT_CHECK) && !defined(DIRECT_THREADED)
1.30      anton     266:   /* turn on alignment checks on the 486.
                    267:    * on the 386 this should have no effect. */
                    268:   __asm__("pushfl; popl %eax; orl $0x40000, %eax; pushl %eax; popfl;");
                    269:   /* this is unusable with Linux' libc.4.6.27, because this library is
                    270:      not alignment-clean; we would have to replace some library
                    271:      functions (e.g., memcpy) to make it work */
1.6       anton     272: #endif
1.2       pazsan    273: 
1.16      pazsan    274:   progname = argv[0];
                    275:   if ((path=getenv("GFORTHPATH"))==NULL)
                    276:     path = strcpy(malloc(strlen(DEFAULTPATH)+1),DEFAULTPATH);
                    277:   opterr=0;
                    278:   while (1) {
                    279:     int option_index=0;
                    280:     static struct option opts[] = {
                    281:       {"image-file", required_argument, NULL, 'i'},
                    282:       {"dictionary-size", required_argument, NULL, 'm'},
                    283:       {"data-stack-size", required_argument, NULL, 'd'},
                    284:       {"return-stack-size", required_argument, NULL, 'r'},
                    285:       {"fp-stack-size", required_argument, NULL, 'f'},
                    286:       {"locals-stack-size", required_argument, NULL, 'l'},
                    287:       {"path", required_argument, NULL, 'p'},
                    288:       {0,0,0,0}
                    289:       /* no-init-file, no-rc? */
                    290:     };
1.10      anton     291: 
1.17      pazsan    292:     c = getopt_long(argc, argv, "+i:m:d:r:f:l:p:", opts, &option_index);
1.12      pazsan    293: 
1.16      pazsan    294:     if (c==EOF)
                    295:       break;
                    296:     if (c=='?') {
                    297:       optind--;
                    298:       break;
                    299:     }
                    300:     switch (c) {
                    301:     case 'i': imagename = optarg; break;
                    302:     case 'm': dictsize = convsize(optarg,sizeof(Cell)); break;
                    303:     case 'd': dsize = convsize(optarg,sizeof(Cell)); break;
                    304:     case 'r': rsize = convsize(optarg,sizeof(Cell)); break;
                    305:     case 'f': fsize = convsize(optarg,sizeof(Float)); break;
                    306:     case 'l': lsize = convsize(optarg,sizeof(Cell)); break;
                    307:     case 'p': path = optarg; break;
                    308:     }
                    309:   }
                    310:   path1=path;
1.29      pazsan    311: 
                    312:   if(strchr(imagename, '/')==NULL)
                    313:     {
                    314:       do {
                    315:        char *pend=strchr(path, ':');
                    316:        if (pend==NULL)
                    317:          pend=path+strlen(path);
                    318:        if (strlen(path)==0) {
                    319:          fprintf(stderr,"%s: cannot open image file %s in path %s for reading\n",
                    320:                  progname, imagename, path1);
                    321:          exit(1);
                    322:        }
                    323:        {
                    324:          int dirlen=pend-path;
                    325:          char fullfilename[dirlen+strlen(imagename)+2];
                    326:          memcpy(fullfilename, path, dirlen);
                    327:          if (fullfilename[dirlen-1]!='/')
                    328:            fullfilename[dirlen++]='/';
                    329:          strcpy(fullfilename+dirlen,imagename);
                    330:          image_file=fopen(fullfilename,"rb");
                    331:        }
                    332:        path=pend+(*pend==':');
                    333:       } while (image_file==NULL);
1.16      pazsan    334:     }
1.29      pazsan    335:   else
1.16      pazsan    336:     {
1.29      pazsan    337:       image_file=fopen(imagename,"rb");
                    338:       if(image_file==NULL)
                    339:          fprintf(stderr,"%s: cannot open image file %s for reading\n",
                    340:                  progname, imagename);
1.16      pazsan    341:     }
1.29      pazsan    342: 
1.16      pazsan    343:   {
                    344:     Cell environ[]= {
                    345:       (Cell)argc-(optind-1),
                    346:       (Cell)(argv+(optind-1)),
                    347:       (Cell)path1};
                    348:     argv[optind-1] = progname;
                    349:     /*
                    350:        for (i=0; i<environ[0]; i++)
                    351:        printf("%s\n", ((char **)(environ[1]))[i]);
                    352:        */
                    353:     retvalue=go_forth(loader(image_file),3,environ);
                    354:     deprep_terminal();
                    355:     exit(retvalue);
                    356:   }
1.1       anton     357: }

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