1: /* Gforth virtual machine (aka inner interpreter)
2:
3: Copyright (C) 1995 Free Software Foundation, Inc.
4:
5: This file is part of Gforth.
6:
7: Gforth is free software; you can redistribute it and/or
8: modify it under the terms of the GNU General Public License
9: as published by the Free Software Foundation; either version 2
10: of the License, or (at your option) any later version.
11:
12: This program is distributed in the hope that it will be useful,
13: but WITHOUT ANY WARRANTY; without even the implied warranty of
14: MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15: GNU General Public License for more details.
16:
17: You should have received a copy of the GNU General Public License
18: along with this program; if not, write to the Free Software
19: Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
20: */
21:
22: #include "config.h"
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 <time.h>
33: #include <sys/time.h>
34: #include <unistd.h>
35: #include <errno.h>
36: #include <pwd.h>
37: #include "forth.h"
38: #include "io.h"
39: #include "threaded.h"
40:
41: #if defined(HAVE_LIBDL) || defined(HAVE_DLOPEN) /* what else? */
42: #include <dlfcn.h>
43: #endif
44: #ifdef hpux
45: #include <dl.h>
46: #endif
47:
48: #ifndef SEEK_SET
49: /* should be defined in stdio.h, but some systems don't have it */
50: #define SEEK_SET 0
51: #endif
52:
53: #define IOR(flag) ((flag)? -512-errno : 0)
54:
55: typedef struct F83Name {
56: struct F83Name *next; /* the link field for old hands */
57: char countetc;
58: Char name[0];
59: } F83Name;
60:
61: /* are macros for setting necessary? */
62: #define F83NAME_COUNT(np) ((np)->countetc & 0x1f)
63: #define F83NAME_SMUDGE(np) (((np)->countetc & 0x40) != 0)
64: #define F83NAME_IMMEDIATE(np) (((np)->countetc & 0x20) != 0)
65:
66: Cell *SP;
67: Float *FP;
68: Address UP=NULL;
69:
70: #if 0
71: /* not used currently */
72: int emitcounter;
73: #endif
74: #define NULLC '\0'
75:
76: char *cstr(Char *from, UCell size, int clear)
77: /* return a C-string corresponding to the Forth string ( FROM SIZE ).
78: the C-string lives until the next call of cstr with CLEAR being true */
79: {
80: static struct cstr_buffer {
81: char *buffer;
82: size_t size;
83: } *buffers=NULL;
84: static int nbuffers=0;
85: static int used=0;
86: struct cstr_buffer *b;
87:
88: if (buffers==NULL)
89: buffers=malloc(0);
90: if (clear)
91: used=0;
92: if (used>=nbuffers) {
93: buffers=realloc(buffers,sizeof(struct cstr_buffer)*(used+1));
94: buffers[used]=(struct cstr_buffer){malloc(0),0};
95: nbuffers=used+1;
96: }
97: b=&buffers[used];
98: if (size+1 > b->size) {
99: b->buffer = realloc(b->buffer,size+1);
100: b->size = size+1;
101: }
102: memcpy(b->buffer,from,size);
103: b->buffer[size]='\0';
104: used++;
105: return b->buffer;
106: }
107:
108: char *tilde_cstr(Char *from, UCell size, int clear)
109: /* like cstr(), but perform tilde expansion on the string */
110: {
111: char *s1,*s2;
112: int s1_len, s2_len;
113: struct passwd *getpwnam (), *user_entry;
114:
115: if (size<1 || from[0]!='~')
116: return cstr(from, size, clear);
117: if (size<2 || from[1]=='/') {
118: s1 = (char *)getenv ("HOME");
119: if(s1 == NULL)
120: s1 = "";
121: s2 = from+1;
122: s2_len = size-1;
123: } else {
124: UCell i;
125: for (i=1; i<size && from[i]!='/'; i++)
126: ;
127: {
128: char user[i];
129: memcpy(user,from+1,i-1);
130: user[i-1]='\0';
131: user_entry=getpwnam(user);
132: }
133: if (user_entry==NULL)
134: return cstr(from, size, clear);
135: s1 = user_entry->pw_dir;
136: s2 = from+i;
137: s2_len = size-i;
138: }
139: s1_len = strlen(s1);
140: if (s1_len>1 && s1[s1_len-1]=='/')
141: s1_len--;
142: {
143: char path[s1_len+s2_len];
144: memcpy(path,s1,s1_len);
145: memcpy(path+s1_len,s2,s2_len);
146: return cstr(path,s1_len+s2_len,clear);
147: }
148: }
149:
150:
151: #define NEWLINE '\n'
152:
153: #ifndef HAVE_RINT
154: #define rint(x) floor((x)+0.5)
155: #endif
156:
157: static char* fileattr[6]={"r","rb","r+","r+b","w","wb"};
158:
159: #ifndef O_BINARY
160: #define O_BINARY 0
161: #endif
162: #ifndef O_TEXT
163: #define O_TEXT 0
164: #endif
165:
166: static int ufileattr[6]= {
167: O_RDONLY|O_TEXT, O_RDONLY|O_BINARY,
168: O_RDWR |O_TEXT, O_RDWR |O_BINARY,
169: O_WRONLY|O_TEXT, O_WRONLY|O_BINARY };
170:
171: /* if machine.h has not defined explicit registers, define them as implicit */
172: #ifndef IPREG
173: #define IPREG
174: #endif
175: #ifndef SPREG
176: #define SPREG
177: #endif
178: #ifndef RPREG
179: #define RPREG
180: #endif
181: #ifndef FPREG
182: #define FPREG
183: #endif
184: #ifndef LPREG
185: #define LPREG
186: #endif
187: #ifndef CFAREG
188: #define CFAREG
189: #endif
190: #ifndef UPREG
191: #define UPREG
192: #endif
193: #ifndef TOSREG
194: #define TOSREG
195: #endif
196: #ifndef FTOSREG
197: #define FTOSREG
198: #endif
199:
200: #ifndef CPU_DEP1
201: # define CPU_DEP1 0
202: #endif
203:
204: /* declare and compute cfa for certain threading variants */
205: /* warning: this is nonsyntactical; it will not work in place of a statement */
206: #ifdef CFA_NEXT
207: #define DOCFA
208: #else
209: #define DOCFA Xt cfa; GETCFA(cfa)
210: #endif
211:
212: Label *engine(Xt *ip0, Cell *sp0, Cell *rp0, Float *fp0, Address lp0)
213: /* executes code at ip, if ip!=NULL
214: returns array of machine code labels (for use in a loader), if ip==NULL
215: */
216: {
217: register Xt *ip IPREG = ip0;
218: register Cell *sp SPREG = sp0;
219: register Cell *rp RPREG = rp0;
220: register Float *fp FPREG = fp0;
221: register Address lp LPREG = lp0;
222: #ifdef CFA_NEXT
223: register Xt cfa CFAREG;
224: #endif
225: register Address up UPREG = UP;
226: IF_TOS(register Cell TOS TOSREG;)
227: IF_FTOS(register Float FTOS FTOSREG;)
228: #if defined(DOUBLY_INDIRECT)
229: static Label *symbols;
230: static void *routines[]= {
231: #else /* !defined(DOUBLY_INDIRECT) */
232: static Label symbols[]= {
233: #endif /* !defined(DOUBLY_INDIRECT) */
234: &&docol,
235: &&docon,
236: &&dovar,
237: &&douser,
238: &&dodefer,
239: &&dofield,
240: &&dodoes,
241: /* the following entry is normally unused;
242: it's there because its index indicates a does-handler */
243: CPU_DEP1,
244: #include "prim_lab.i"
245: 0
246: };
247: #ifdef CPU_DEP2
248: CPU_DEP2
249: #endif
250:
251: #ifdef DEBUG
252: fprintf(stderr,"ip=%x, sp=%x, rp=%x, fp=%x, lp=%x, up=%x\n",
253: (unsigned)ip,(unsigned)sp,(unsigned)rp,
254: (unsigned)fp,(unsigned)lp,(unsigned)up);
255: #endif
256:
257: if (ip == NULL) {
258: #if defined(DOUBLY_INDIRECT)
259: #define MAX_SYMBOLS 1000
260: int i;
261: Cell code_offset = offset_image? 22*sizeof(Cell) : 0;
262:
263: symbols = (Label *)(malloc(MAX_SYMBOLS*sizeof(Cell)+code_offset)+code_offset);
264: for (i=0; i<DOESJUMP+1; i++)
265: symbols[i] = (Label)routines[i];
266: for (; routines[i]!=0; i++) {
267: if (i>=MAX_SYMBOLS) {
268: fprintf(stderr,"gforth-ditc: more than %d primitives\n",MAX_SYMBOLS);
269: exit(1);
270: }
271: symbols[i] = &routines[i];
272: }
273: #endif /* defined(DOUBLY_INDIRECT) */
274: return symbols;
275: }
276:
277: IF_TOS(TOS = sp[0]);
278: IF_FTOS(FTOS = fp[0]);
279: /* prep_terminal(); */
280: NEXT_P0;
281: NEXT;
282:
283: #ifdef CPU_DEP3
284: CPU_DEP3
285: #endif
286:
287: docol:
288: {
289: DOCFA;
290: #ifdef DEBUG
291: fprintf(stderr,"%08lx: col: %08lx\n",(Cell)ip,(Cell)PFA1(cfa));
292: #endif
293: #ifdef CISC_NEXT
294: /* this is the simple version */
295: *--rp = (Cell)ip;
296: ip = (Xt *)PFA1(cfa);
297: NEXT_P0;
298: NEXT;
299: #else
300: /* this one is important, so we help the compiler optimizing
301: The following version may be better (for scheduling), but probably has
302: problems with code fields employing calls and delay slots
303: */
304: {
305: DEF_CA
306: Xt *current_ip = (Xt *)PFA1(cfa);
307: cfa = *current_ip;
308: NEXT1_P1;
309: *--rp = (Cell)ip;
310: ip = current_ip+1;
311: NEXT1_P2;
312: }
313: #endif
314: }
315:
316: docon:
317: {
318: DOCFA;
319: #ifdef DEBUG
320: fprintf(stderr,"%08lx: con: %08lx\n",(Cell)ip,*(Cell*)PFA1(cfa));
321: #endif
322: #ifdef USE_TOS
323: *sp-- = TOS;
324: TOS = *(Cell *)PFA1(cfa);
325: #else
326: *--sp = *(Cell *)PFA1(cfa);
327: #endif
328: }
329: NEXT_P0;
330: NEXT;
331:
332: dovar:
333: {
334: DOCFA;
335: #ifdef DEBUG
336: fprintf(stderr,"%08lx: var: %08lx\n",(Cell)ip,(Cell)PFA1(cfa));
337: #endif
338: #ifdef USE_TOS
339: *sp-- = TOS;
340: TOS = (Cell)PFA1(cfa);
341: #else
342: *--sp = (Cell)PFA1(cfa);
343: #endif
344: }
345: NEXT_P0;
346: NEXT;
347:
348: douser:
349: {
350: DOCFA;
351: #ifdef DEBUG
352: fprintf(stderr,"%08lx: user: %08lx\n",(Cell)ip,(Cell)PFA1(cfa));
353: #endif
354: #ifdef USE_TOS
355: *sp-- = TOS;
356: TOS = (Cell)(up+*(Cell*)PFA1(cfa));
357: #else
358: *--sp = (Cell)(up+*(Cell*)PFA1(cfa));
359: #endif
360: }
361: NEXT_P0;
362: NEXT;
363:
364: dodefer:
365: {
366: DOCFA;
367: #ifdef DEBUG
368: fprintf(stderr,"%08lx: defer: %08lx\n",(Cell)ip,*(Cell*)PFA1(cfa));
369: #endif
370: EXEC(*(Xt *)PFA1(cfa));
371: }
372:
373: dofield:
374: {
375: DOCFA;
376: #ifdef DEBUG
377: fprintf(stderr,"%08lx: field: %08lx\n",(Cell)ip,(Cell)PFA1(cfa));
378: #endif
379: TOS += *(Cell*)PFA1(cfa);
380: }
381: NEXT_P0;
382: NEXT;
383:
384: dodoes:
385: /* this assumes the following structure:
386: defining-word:
387:
388: ...
389: DOES>
390: (possible padding)
391: possibly handler: jmp dodoes
392: (possible branch delay slot(s))
393: Forth code after DOES>
394:
395: defined word:
396:
397: cfa: address of or jump to handler OR
398: address of or jump to dodoes, address of DOES-code
399: pfa:
400:
401: */
402: {
403: DOCFA;
404:
405: /* fprintf(stderr, "Got CFA %08lx at doescode %08lx/%08lx: does: %08lx\n",cfa,(Cell)ip,(Cell)PFA(cfa),(Cell)DOES_CODE1(cfa));*/
406: #ifdef DEBUG
407: fprintf(stderr,"%08lx/%08lx: does: %08lx\n",(Cell)ip,(Cell)PFA(cfa),(Cell)DOES_CODE1(cfa));
408: fflush(stderr);
409: #endif
410: *--rp = (Cell)ip;
411: /* PFA1 might collide with DOES_CODE1 here, so we use PFA */
412: ip = DOES_CODE1(cfa);
413: #ifdef USE_TOS
414: *sp-- = TOS;
415: TOS = (Cell)PFA(cfa);
416: #else
417: *--sp = (Cell)PFA(cfa);
418: #endif
419: /* fprintf(stderr,"TOS = %08lx, IP=%08lx\n", TOS, IP);*/
420: }
421: NEXT_P0;
422: NEXT;
423:
424: #include "prim.i"
425: }
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