1: /*
2: $Id: main.c,v 1.23 1995/02/14 18:18:36 pazsan Exp $
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"
16: #include "io.h"
17: #include "getopt.h"
18:
19: #ifdef MSDOS
20: jmp_buf throw_jmp_buf;
21: #endif
22:
23: #ifndef DEFAULTPATH
24: # define DEFAULTPATH "/usr/local/lib/gforth:."
25: #endif
26:
27: #ifdef DIRECT_THREADED
28: # define CA(n) (symbols[(n)])
29: #else
30: # define CA(n) ((Cell)(symbols+(n)))
31: #endif
32:
33: #define maxaligned(n) (typeof(n))((((Cell)n)+sizeof(Float)-1)&-sizeof(Float))
34:
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;
40: char *progname;
41:
42:
43: /* image file format:
44: * preamble (is skipped off), size multiple of 8
45: * magig: "gforth00" (means format version 0.0)
46: * size of image with stacks without tags (in bytes)
47: * size of image without stacks and tags (in bytes)
48: * size of data and FP stack (in bytes)
49: * pointer to start of code
50: * pointer into throw (for signal handling)
51: * pointer to dictionary
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,
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
63: */
64:
65: void relocate(Cell *image, char *bitstring, int size, Label symbols[])
66: {
67: int i=0, j, k, steps=(size/sizeof(Cell))/8;
68: char bits;
69: /* static char bits[8]={0x80,0x40,0x20,0x10,0x08,0x04,0x02,0x01};*/
70:
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;
83: case CF(DODOES) : MAKE_DOES_CF(image+i,image[i+1]+((Cell)image));
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;
90: }
91:
92: Cell *loader(FILE *imagefile)
93: {
94: Cell header[3];
95: Cell *image;
96: Char magic[8];
97: int wholesize;
98: int imagesize; /* everything needed by the image */
99:
100: do
101: {
102: if(fread(magic,sizeof(Char),8,imagefile) < 8) {
103: fprintf(stderr,"This file doesn't seem to be a gforth image\n");
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);
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)+sizeof(Float));
132: image = maxaligned(image);
133: memset(image,0,wholesize); /* why? - anton */
134: image[0]=header[0];
135: image[1]=header[1];
136: image[2]=header[2];
137:
138: fread(image+3,1,header[1]-3*sizeof(Cell),imagefile);
139: fread(((void *)image)+header[1],1,((header[1]-1)/sizeof(Cell))/8+1,
140: imagefile);
141: fclose(imagefile);
142:
143: if(image[5]==0) {
144: relocate(image,(char *)image+header[1],header[1],engine(0,0,0,0,0));
145: }
146: else if(image[5]!=(Cell)image) {
147: fprintf(stderr,"Corrupted image address, please recompile image\n");
148: exit(1);
149: }
150:
151: CACHE_FLUSH(image,image[1]);
152:
153: return(image);
154: }
155:
156: int go_forth(Cell *image, int stack, Cell *entries)
157: {
158: Cell *sp=(Cell*)((void *)image+dictsize+dsize);
159: Address lp=(Address)((void *)sp+lsize);
160: Float *fp=(Float *)((void *)lp+fsize);
161: Cell *rp=(Cell*)((void *)fp+rsize);
162: Xt *ip=(Xt *)((Cell)image[3]);
163: int throw_code;
164:
165: for(;stack>0;stack--)
166: *--sp=entries[stack-1];
167:
168: install_signal_handlers(); /* right place? */
169:
170: if ((throw_code=setjmp(throw_jmp_buf))) {
171: static Cell signal_data_stack[8];
172: static Cell signal_return_stack[8];
173: static Float signal_fp_stack[1];
174:
175: signal_data_stack[7]=throw_code;
176:
177: return((int)engine((Xt *)image[4],signal_data_stack+7,
178: signal_return_stack+8,signal_fp_stack,0));
179: }
180:
181: return((int)engine(ip,sp,rp,fp,lp));
182: }
183:
184: int convsize(char *s, int elemsize)
185: /* converts s of the format #+u (e.g. 25k) into the number of bytes.
186: the unit u can be one of bekM, where e stands for the element
187: size. default is e */
188: {
189: char *endp;
190: int n,m;
191:
192: m = elemsize;
193: n = strtoul(s,&endp,0);
194: if (endp!=NULL) {
195: if (strcmp(endp,"b")==0)
196: m=1;
197: else if (strcmp(endp,"k")==0)
198: m=1024;
199: else if (strcmp(endp,"M")==0)
200: m=1024*1024;
201: else if (strcmp(endp,"e")!=0) {
202: fprintf(stderr,"%s: cannot grok size specification %s\n", progname, s);
203: exit(1);
204: }
205: }
206: return n*m;
207: }
208:
209: int main(int argc, char **argv, char **env)
210: {
211: char *path, *path1;
212: char *imagename="gforth.fi";
213: FILE *image_file;
214: int c, retvalue;
215:
216: #if defined(i386) && defined(ALIGNMENT_CHECK) && !defined(DIRECT_THREADED)
217: /* turn on alignment checks on the 486.
218: * on the 386 this should have no effect. */
219: __asm__("pushfl; popl %eax; orl $0x40000, %eax; pushl %eax; popfl;");
220: #endif
221:
222: progname = argv[0];
223: if ((path=getenv("GFORTHPATH"))==NULL)
224: path = strcpy(malloc(strlen(DEFAULTPATH)+1),DEFAULTPATH);
225: opterr=0;
226: while (1) {
227: int option_index=0;
228: static struct option opts[] = {
229: {"image-file", required_argument, NULL, 'i'},
230: {"dictionary-size", required_argument, NULL, 'm'},
231: {"data-stack-size", required_argument, NULL, 'd'},
232: {"return-stack-size", required_argument, NULL, 'r'},
233: {"fp-stack-size", required_argument, NULL, 'f'},
234: {"locals-stack-size", required_argument, NULL, 'l'},
235: {"path", required_argument, NULL, 'p'},
236: {0,0,0,0}
237: /* no-init-file, no-rc? */
238: };
239:
240: c = getopt_long(argc, argv, "+i:m:d:r:f:l:p:", opts, &option_index);
241:
242: if (c==EOF)
243: break;
244: if (c=='?') {
245: optind--;
246: break;
247: }
248: switch (c) {
249: case 'i': imagename = optarg; break;
250: case 'm': dictsize = convsize(optarg,sizeof(Cell)); break;
251: case 'd': dsize = convsize(optarg,sizeof(Cell)); break;
252: case 'r': rsize = convsize(optarg,sizeof(Cell)); break;
253: case 'f': fsize = convsize(optarg,sizeof(Float)); break;
254: case 'l': lsize = convsize(optarg,sizeof(Cell)); break;
255: case 'p': path = optarg; break;
256: }
257: }
258: path1=path;
259: do {
260: char *pend=strchr(path, ':');
261: if (pend==NULL)
262: pend=path+strlen(path);
263: if (strlen(path)==0) {
264: fprintf(stderr,"%s: cannot open image file %s in path %s for reading\n",
265: progname, imagename, path1);
266: exit(1);
267: }
268: {
269: int dirlen=pend-path;
270: char fullfilename[dirlen+strlen(imagename)+2];
271: memcpy(fullfilename, path, dirlen);
272: if (fullfilename[dirlen-1]!='/')
273: fullfilename[dirlen++]='/';
274: strcpy(fullfilename+dirlen,imagename);
275: image_file=fopen(fullfilename,"rb");
276: }
277: path=pend+(*pend==':');
278: } while (image_file==NULL);
279:
280: {
281: Cell environ[]= {
282: (Cell)argc-(optind-1),
283: (Cell)(argv+(optind-1)),
284: (Cell)path1};
285: argv[optind-1] = progname;
286: /*
287: for (i=0; i<environ[0]; i++)
288: printf("%s\n", ((char **)(environ[1]))[i]);
289: */
290: retvalue=go_forth(loader(image_file),3,environ);
291: deprep_terminal();
292: exit(retvalue);
293: }
294: }
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