Annotation of gforth/main.c, revision 1.22

1.1       anton       1: /*
1.21      pazsan      2:   $Id: main.c,v 1.20 1994/12/12 17:10:42 anton Exp $
1.1       anton       3:   Copyright 1993 by the ANSI figForth Development Group
                      4: */
                      5: 
                      6: #include <ctype.h>
                      7: #include <stdio.h>
                      8: #include <string.h>
                      9: #include <math.h>
                     10: #include <sys/types.h>
                     11: #include <sys/stat.h>
                     12: #include <fcntl.h>
                     13: #include <assert.h>
                     14: #include <stdlib.h>
                     15: #include "forth.h"
1.5       pazsan     16: #include "io.h"
1.20      anton      17: #include "getopt.h"
1.2       pazsan     18: 
1.22    ! pazsan     19: #ifdef MSDOS
        !            20: jmp_buf throw_jmp_buf;
        !            21: #endif
        !            22: 
1.10      anton      23: #ifndef DEFAULTPATH
1.16      pazsan     24: #  define DEFAULTPATH "/usr/local/lib/gforth:."
1.10      anton      25: #endif
                     26: 
1.1       anton      27: #ifdef DIRECT_THREADED
1.16      pazsan     28: #  define CA(n)        (symbols[(n)])
1.1       anton      29: #else
1.21      pazsan     30: #  define CA(n)        ((Cell)(symbols+(n)))
1.1       anton      31: #endif
                     32: 
1.10      anton      33: #define maxaligned(n)  ((((Cell)n)+sizeof(Float)-1)&-sizeof(Float))
                     34: 
1.21      pazsan     35: static Cell dictsize=0;
                     36: static Cell dsize=0;
                     37: static Cell rsize=0;
                     38: static Cell fsize=0;
                     39: static Cell lsize=0;
1.10      anton      40: char *progname;
                     41: 
                     42: 
1.1       anton      43: /* image file format:
1.18      pazsan     44:  *   preamble (is skipped off), size multiple of 8
                     45:  *   magig: "gforth00" (means format version 0.0)
1.1       anton      46:  *   size of image with stacks without tags (in bytes)
                     47:  *   size of image without stacks and tags (in bytes)
1.5       pazsan     48:  *   size of data and FP stack (in bytes)
1.1       anton      49:  *   pointer to start of code
1.7       anton      50:  *   pointer into throw (for signal handling)
1.16      pazsan     51:  *   pointer to dictionary
1.1       anton      52:  *   data (size in image[1])
                     53:  *   tags (1 bit/data cell)
                     54:  *
                     55:  * tag==1 mean that the corresponding word is an address;
                     56:  * If the word is >=0, the address is within the image;
                     57:  * addresses within the image are given relative to the start of the image.
                     58:  * If the word is =-1, the address is NIL,
1.2       pazsan     59:  * If the word is between -2 and -5, it's a CFA (:, Create, Constant, User)
                     60:  * If the word is -6, it's a DOES> CFA
                     61:  * If the word is -7, it's a DOES JUMP
                     62:  * If the word is <-7, it's a primitive
1.1       anton      63:  */
                     64: 
1.10      anton      65: void relocate(Cell *image, char *bitstring, int size, Label symbols[])
1.1       anton      66: {
1.16      pazsan     67:   int i=0, j, k, steps=(size/sizeof(Cell))/8;
                     68:   char bits;
1.5       pazsan     69: /*   static char bits[8]={0x80,0x40,0x20,0x10,0x08,0x04,0x02,0x01};*/
                     70:    
1.16      pazsan     71:   for(k=0; k<=steps; k++)
                     72:     for(j=0, bits=bitstring[k]; j<8; j++, i++, bits<<=1)
                     73:       if(bits & 0x80)
                     74:        if(image[i]<0)
                     75:          switch(image[i])
                     76:            {
                     77:            case CF_NIL      : image[i]=0; break;
                     78:            case CF(DOCOL)   :
                     79:            case CF(DOVAR)   :
                     80:            case CF(DOCON)   :
                     81:            case CF(DOUSER)  : 
                     82:            case CF(DODEFER) : MAKE_CF(image+i,symbols[CF(image[i])]); break;
1.21      pazsan     83:            case CF(DODOES)  : MAKE_DOES_CF(image+i,image[i+1]+((Cell)image));
1.16      pazsan     84:              break;
                     85:            case CF(DOESJUMP): MAKE_DOES_HANDLER(image+i); break;
                     86:            default          : image[i]=(Cell)CA(CF(image[i]));
                     87:            }
                     88:        else
                     89:          image[i]+=(Cell)image;
1.1       anton      90: }
                     91: 
1.10      anton      92: Cell *loader(FILE *imagefile)
                     93: {
1.16      pazsan     94:   Cell header[3];
                     95:   Cell *image;
1.18      pazsan     96:   Char magic[8];
1.16      pazsan     97:   int wholesize;
                     98:   int imagesize; /* everything needed by the image */
1.18      pazsan     99: 
                    100:   do
                    101:     {
                    102:       if(fread(magic,sizeof(Char),8,imagefile) < 8) {
1.21      pazsan    103:        fprintf(stderr,"This file doesn't seem to be a gforth image\n");
1.18      pazsan    104:        exit(1);
                    105:       }
                    106: #ifdef DEBUG
                    107:       printf("Magic found: %s\n",magic);
                    108: #endif
                    109:     }
                    110:   while(memcmp(magic,"gforth00",8));
                    111: 
                    112:   fread(header,sizeof(Cell),3,imagefile);
1.16      pazsan    113:   if (dictsize==0)
                    114:     dictsize = header[0];
                    115:   if (dsize==0)
                    116:     dsize=header[2];
                    117:   if (rsize==0)
                    118:     rsize=header[2];
                    119:   if (fsize==0)
                    120:     fsize=header[2];
                    121:   if (lsize==0)
                    122:     lsize=header[2];
                    123:   dictsize=maxaligned(dictsize);
                    124:   dsize=maxaligned(dsize);
                    125:   rsize=maxaligned(rsize);
                    126:   lsize=maxaligned(lsize);
                    127:   fsize=maxaligned(fsize);
                    128:   
                    129:   wholesize = dictsize+dsize+rsize+fsize+lsize;
                    130:   imagesize = header[1]+((header[1]-1)/sizeof(Cell))/8+1;
                    131:   image=malloc(wholesize>imagesize?wholesize:imagesize);
                    132:   memset(image,0,wholesize); /* why? - anton */
                    133:   image[0]=header[0];
                    134:   image[1]=header[1];
                    135:   image[2]=header[2];
                    136:   
                    137:   fread(image+3,1,header[1]-3*sizeof(Cell),imagefile);
                    138:   fread(((void *)image)+header[1],1,((header[1]-1)/sizeof(Cell))/8+1,
                    139:        imagefile);
                    140:   fclose(imagefile);
                    141:   
                    142:   if(image[5]==0) {
                    143:     relocate(image,(char *)image+header[1],header[1],engine(0,0,0,0,0));
                    144:   }
                    145:   else if(image[5]!=(Cell)image) {
                    146:     fprintf(stderr,"Corrupted image address, please recompile image\n");
                    147:     exit(1);
                    148:   }
1.1       anton     149: 
1.16      pazsan    150:   CACHE_FLUSH(image,image[1]);
                    151:   
                    152:   return(image);
1.1       anton     153: }
                    154: 
1.10      anton     155: int go_forth(Cell *image, int stack, Cell *entries)
1.1       anton     156: {
1.15      anton     157:   Cell *sp=(Cell*)((void *)image+dictsize+dsize);
                    158:   Address lp=(Address)((void *)sp+lsize);
                    159:   Float *fp=(Float *)((void *)lp+fsize);
                    160:   Cell *rp=(Cell*)((void *)fp+rsize);
1.21      pazsan    161:   Xt *ip=(Xt *)((Cell)image[3]);
1.15      anton     162:   int throw_code;
                    163:   
                    164:   for(;stack>0;stack--)
                    165:     *--sp=entries[stack-1];
                    166:   
                    167:   install_signal_handlers(); /* right place? */
                    168:   
                    169:   if ((throw_code=setjmp(throw_jmp_buf))) {
                    170:     static Cell signal_data_stack[8];
                    171:     static Cell signal_return_stack[8];
                    172:     static Float signal_fp_stack[1];
                    173:     
                    174:     signal_data_stack[7]=throw_code;
                    175:     
                    176:     return((int)engine((Xt *)image[4],signal_data_stack+7,
                    177:                       signal_return_stack+8,signal_fp_stack,0));
                    178:   }
                    179:   
                    180:   return((int)engine(ip,sp,rp,fp,lp));
1.1       anton     181: }
                    182: 
1.10      anton     183: int convsize(char *s, int elemsize)
                    184: /* converts s of the format #+u (e.g. 25k) into the number of bytes.
                    185:    the unit u can be one of bekM, where e stands for the element
                    186:    size. default is e */
                    187: {
                    188:   char *endp;
                    189:   int n,m;
                    190: 
                    191:   m = elemsize;
                    192:   n = strtoul(s,&endp,0);
                    193:   if (endp!=NULL) {
                    194:     if (strcmp(endp,"b")==0)
                    195:       m=1;
                    196:     else if (strcmp(endp,"k")==0)
                    197:       m=1024;
                    198:     else if (strcmp(endp,"M")==0)
                    199:       m=1024*1024;
                    200:     else if (strcmp(endp,"e")!=0) {
                    201:       fprintf(stderr,"%s: cannot grok size specification %s\n", progname, s);
                    202:       exit(1);
                    203:     }
                    204:   }
                    205:   return n*m;
                    206: }
                    207: 
1.1       anton     208: int main(int argc, char **argv, char **env)
                    209: {
1.16      pazsan    210:   char *path, *path1;
                    211:   char *imagename="gforth.fi";
                    212:   FILE *image_file;
                    213:   int c, retvalue;
1.10      anton     214:          
1.14      anton     215: #if defined(i386) && defined(ALIGNMENT_CHECK) && !defined(DIRECT_THREADED)
1.6       anton     216:        /* turn on alignment checks on the 486.
                    217:         * on the 386 this should have no effect. */
                    218:        __asm__("pushfl; popl %eax; orl $0x40000, %eax; pushl %eax; popfl;");
                    219: #endif
1.2       pazsan    220: 
1.16      pazsan    221:   progname = argv[0];
                    222:   if ((path=getenv("GFORTHPATH"))==NULL)
                    223:     path = strcpy(malloc(strlen(DEFAULTPATH)+1),DEFAULTPATH);
                    224:   opterr=0;
                    225:   while (1) {
                    226:     int option_index=0;
                    227:     static struct option opts[] = {
                    228:       {"image-file", required_argument, NULL, 'i'},
                    229:       {"dictionary-size", required_argument, NULL, 'm'},
                    230:       {"data-stack-size", required_argument, NULL, 'd'},
                    231:       {"return-stack-size", required_argument, NULL, 'r'},
                    232:       {"fp-stack-size", required_argument, NULL, 'f'},
                    233:       {"locals-stack-size", required_argument, NULL, 'l'},
                    234:       {"path", required_argument, NULL, 'p'},
                    235:       {0,0,0,0}
                    236:       /* no-init-file, no-rc? */
                    237:     };
1.10      anton     238: 
1.17      pazsan    239:     c = getopt_long(argc, argv, "+i:m:d:r:f:l:p:", opts, &option_index);
1.12      pazsan    240: 
1.16      pazsan    241:     if (c==EOF)
                    242:       break;
                    243:     if (c=='?') {
                    244:       optind--;
                    245:       break;
                    246:     }
                    247:     switch (c) {
                    248:     case 'i': imagename = optarg; break;
                    249:     case 'm': dictsize = convsize(optarg,sizeof(Cell)); break;
                    250:     case 'd': dsize = convsize(optarg,sizeof(Cell)); break;
                    251:     case 'r': rsize = convsize(optarg,sizeof(Cell)); break;
                    252:     case 'f': fsize = convsize(optarg,sizeof(Float)); break;
                    253:     case 'l': lsize = convsize(optarg,sizeof(Cell)); break;
                    254:     case 'p': path = optarg; break;
                    255:     }
                    256:   }
                    257:   path1=path;
                    258:   do {
                    259:     char *pend=strchr(path, ':');
                    260:     if (pend==NULL)
                    261:       pend=path+strlen(path);
                    262:     if (strlen(path)==0) {
                    263:       fprintf(stderr,"%s: cannot open image file %s in path %s for reading\n",
                    264:              progname, imagename, path1);
                    265:       exit(1);
                    266:     }
                    267:     {
                    268:       int dirlen=pend-path;
                    269:       char fullfilename[dirlen+strlen(imagename)+2];
                    270:       memcpy(fullfilename, path, dirlen);
                    271:       if (fullfilename[dirlen-1]!='/')
                    272:        fullfilename[dirlen++]='/';
                    273:       strcpy(fullfilename+dirlen,imagename);
                    274:       image_file=fopen(fullfilename,"rb");
                    275:     }
                    276:     path=pend+(*pend==':');
                    277:   } while (image_file==NULL);
                    278:   
                    279:   {
                    280:     Cell environ[]= {
                    281:       (Cell)argc-(optind-1),
                    282:       (Cell)(argv+(optind-1)),
                    283:       (Cell)path1};
                    284:     argv[optind-1] = progname;
                    285:     /*
                    286:        for (i=0; i<environ[0]; i++)
                    287:        printf("%s\n", ((char **)(environ[1]))[i]);
                    288:        */
                    289:     retvalue=go_forth(loader(image_file),3,environ);
                    290:     deprep_terminal();
                    291:     exit(retvalue);
                    292:   }
1.1       anton     293: }

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