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