1: /*
2: $Id: main.c,v 1.13 1994/09/26 20:31:14 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: #ifdef USE_GETOPT
18: # include "getopt.h"
19: #else
20: extern int getopt (argc, argv, optstring);
21:
22: extern char *optarg;
23: extern int optind, opterr;
24: #endif
25:
26: #ifndef DEFAULTPATH
27: # define DEFAULTPATH "/usr/local/lib/gforth:."
28: #endif
29:
30: #ifdef DIRECT_THREADED
31: # define CA(n) (symbols[(n)])
32: #else
33: # define CA(n) ((int)(symbols+(n)))
34: #endif
35:
36: #define maxaligned(n) ((((Cell)n)+sizeof(Float)-1)&-sizeof(Float))
37:
38: static int dictsize=0;
39: static int dsize=0;
40: static int rsize=0;
41: static int fsize=0;
42: static int lsize=0;
43: char *progname;
44:
45:
46: /* image file format:
47: * size of image with stacks without tags (in bytes)
48: * size of image without stacks and tags (in bytes)
49: * size of data and FP stack (in bytes)
50: * pointer to start of code
51: * pointer into throw (for signal handling)
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]+((int)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: CACHE_FLUSH(image,size);
92: }
93:
94: Cell *loader(FILE *imagefile)
95: {
96: Cell header[3];
97: Cell *image;
98: int wholesize;
99: int imagesize; /* everything needed by the image */
100:
101: fread(header,1,3*sizeof(Cell),imagefile);
102: if (dictsize==0)
103: dictsize = header[0];
104: if (dsize==0)
105: dsize=header[2];
106: if (rsize==0)
107: rsize=header[2];
108: if (fsize==0)
109: fsize=header[2];
110: if (lsize==0)
111: lsize=header[2];
112: dictsize=maxaligned(dictsize);
113: dsize=maxaligned(dsize);
114: rsize=maxaligned(rsize);
115: lsize=maxaligned(lsize);
116: fsize=maxaligned(fsize);
117:
118: wholesize = dictsize+dsize+rsize+fsize+lsize;
119: imagesize = header[1]+((header[1]-1)/sizeof(Cell))/8+1;
120: image=malloc(wholesize>imagesize?wholesize:imagesize);
121: memset(image,0,wholesize); /* why? - anton */
122: image[0]=header[0];
123: image[1]=header[1];
124: image[2]=header[2];
125:
126: fread(image+3,1,header[1]-3*sizeof(Cell),imagefile);
127: fread(((void *)image)+header[1],1,((header[1]-1)/sizeof(Cell))/8+1,
128: imagefile);
129: fclose(imagefile);
130:
131: relocate(image,(char *)image+header[1],header[1],engine(0,0,0,0,0));
132:
133: return(image);
134: }
135:
136: int go_forth(Cell *image, int stack, Cell *entries)
137: {
138: Cell *sp=(Cell*)((void *)image+dictsize+dsize);
139: Address lp=(Address)((void *)sp+lsize);
140: Float *fp=(Float *)((void *)lp+fsize);
141: Cell *rp=(Cell*)((void *)fp+rsize);
142: Xt *ip=(Xt *)(image[3]);
143: int throw_code;
144:
145: for(;stack>0;stack--)
146: *--sp=entries[stack-1];
147:
148: install_signal_handlers(); /* right place? */
149:
150: if ((throw_code=setjmp(throw_jmp_buf))) {
151: static Cell signal_data_stack[8];
152: static Cell signal_return_stack[8];
153: static Float signal_fp_stack[1];
154:
155: signal_data_stack[7]=throw_code;
156:
157: return((int)engine((Xt *)image[4],signal_data_stack+7,
158: signal_return_stack+8,signal_fp_stack,0));
159: }
160:
161: return((int)engine(ip,sp,rp,fp,lp));
162: }
163:
164: int convsize(char *s, int elemsize)
165: /* converts s of the format #+u (e.g. 25k) into the number of bytes.
166: the unit u can be one of bekM, where e stands for the element
167: size. default is e */
168: {
169: char *endp;
170: int n,m;
171:
172: m = elemsize;
173: n = strtoul(s,&endp,0);
174: if (endp!=NULL) {
175: if (strcmp(endp,"b")==0)
176: m=1;
177: else if (strcmp(endp,"k")==0)
178: m=1024;
179: else if (strcmp(endp,"M")==0)
180: m=1024*1024;
181: else if (strcmp(endp,"e")!=0) {
182: fprintf(stderr,"%s: cannot grok size specification %s\n", progname, s);
183: exit(1);
184: }
185: }
186: return n*m;
187: }
188:
189: int main(int argc, char **argv, char **env)
190: {
191: char *path, *path1;
192: char *imagename="gforth.fi";
193: FILE *image_file;
194: int c, retvalue;
195:
196: #if defined(i386) && defined(ALIGNMENT_CHECK)
197: /* turn on alignment checks on the 486.
198: * on the 386 this should have no effect. */
199: __asm__("pushfl; popl %eax; orl $0x40000, %eax; pushl %eax; popfl;");
200: #endif
201:
202: progname = argv[0];
203: if ((path=getenv("GFORTHPATH"))==NULL)
204: path = strcpy(malloc(strlen(DEFAULTPATH)+1),DEFAULTPATH);
205: opterr=0;
206: while (1) {
207: int option_index=0;
208: #ifdef USE_GETOPT
209: static struct option opts[] = {
210: {"image-file", required_argument, NULL, 'i'},
211: {"dictionary-size", required_argument, NULL, 'm'},
212: {"data-stack-size", required_argument, NULL, 'd'},
213: {"return-stack-size", required_argument, NULL, 'r'},
214: {"fp-stack-size", required_argument, NULL, 'f'},
215: {"locals-stack-size", required_argument, NULL, 'l'},
216: {"path", required_argument, NULL, 'p'},
217: {0,0,0,0}
218: /* no-init-file, no-rc? */
219: };
220:
221: c = getopt_long(argc, argv, "+drfl", opts, &option_index);
222: #else
223: c = getopt(argc, argv, "imdrflp");
224: #endif
225:
226: if (c==EOF)
227: break;
228: if (c=='?') {
229: optind--;
230: break;
231: }
232: switch (c) {
233: case 'i': imagename = optarg; break;
234: case 'm': dictsize = convsize(optarg,sizeof(Cell)); break;
235: case 'd': dsize = convsize(optarg,sizeof(Cell)); break;
236: case 'r': rsize = convsize(optarg,sizeof(Cell)); break;
237: case 'f': fsize = convsize(optarg,sizeof(Float)); break;
238: case 'l': lsize = convsize(optarg,sizeof(Cell)); break;
239: case 'p': path = optarg; break;
240: }
241: }
242: path1=path;
243: do {
244: char *pend=strchr(path, ':');
245: if (pend==NULL)
246: pend=path+strlen(path);
247: if (strlen(path)==0) {
248: fprintf(stderr,"%s: cannot open image file %s in path %s for reading\n", progname, imagename, path1);
249: exit(1);
250: }
251: {
252: int dirlen=pend-path;
253: char fullfilename[dirlen+strlen(imagename)+2];
254: memcpy(fullfilename, path, dirlen);
255: if (fullfilename[dirlen-1]!='/')
256: fullfilename[dirlen++]='/';
257: strcpy(fullfilename+dirlen,imagename);
258: image_file=fopen(fullfilename,"rb");
259: }
260: path=pend+(*pend==':');
261: } while (image_file==NULL);
262:
263: {
264: Cell environ[]= {(Cell)argc-(optind-1), (Cell)(argv+(optind-1)), (Cell)path1};
265: argv[optind-1] = progname;
266: /*
267: for (i=0; i<environ[0]; i++)
268: printf("%s\n", ((char **)(environ[1]))[i]);
269: */
270: retvalue=go_forth(loader(image_file),3,environ);
271: deprep_terminal();
272: exit(retvalue);
273: }
274: }
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