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 (sizeof(routines)/sizeof(routines[0]))
260: #define CODE_OFFSET (22*sizeof(Cell))
261: int i;
262: Cell code_offset = offset_image? CODE_OFFSET : 0;
263:
264: symbols = (Label *)(malloc(MAX_SYMBOLS*sizeof(Cell)+CODE_OFFSET)+code_offset);
265: for (i=0; i<DOESJUMP+1; i++)
266: symbols[i] = (Label)routines[i];
267: for (; routines[i]!=0; i++) {
268: if (i>=MAX_SYMBOLS) {
269: fprintf(stderr,"gforth-ditc: more than %d primitives\n",MAX_SYMBOLS);
270: exit(1);
271: }
272: symbols[i] = &routines[i];
273: }
274: #endif /* defined(DOUBLY_INDIRECT) */
275: return symbols;
276: }
277:
278: IF_TOS(TOS = sp[0]);
279: IF_FTOS(FTOS = fp[0]);
280: /* prep_terminal(); */
281: NEXT_P0;
282: NEXT;
283:
284: #ifdef CPU_DEP3
285: CPU_DEP3
286: #endif
287:
288: docol:
289: {
290: DOCFA;
291: #ifdef DEBUG
292: fprintf(stderr,"%08lx: col: %08lx\n",(Cell)ip,(Cell)PFA1(cfa));
293: #endif
294: #ifdef CISC_NEXT
295: /* this is the simple version */
296: *--rp = (Cell)ip;
297: ip = (Xt *)PFA1(cfa);
298: NEXT_P0;
299: NEXT;
300: #else
301: /* this one is important, so we help the compiler optimizing
302: The following version may be better (for scheduling), but probably has
303: problems with code fields employing calls and delay slots
304: */
305: {
306: DEF_CA
307: Xt *current_ip = (Xt *)PFA1(cfa);
308: cfa = *current_ip;
309: NEXT1_P1;
310: *--rp = (Cell)ip;
311: ip = current_ip+1;
312: NEXT1_P2;
313: }
314: #endif
315: }
316:
317: docon:
318: {
319: DOCFA;
320: #ifdef DEBUG
321: fprintf(stderr,"%08lx: con: %08lx\n",(Cell)ip,*(Cell*)PFA1(cfa));
322: #endif
323: #ifdef USE_TOS
324: *sp-- = TOS;
325: TOS = *(Cell *)PFA1(cfa);
326: #else
327: *--sp = *(Cell *)PFA1(cfa);
328: #endif
329: }
330: NEXT_P0;
331: NEXT;
332:
333: dovar:
334: {
335: DOCFA;
336: #ifdef DEBUG
337: fprintf(stderr,"%08lx: var: %08lx\n",(Cell)ip,(Cell)PFA1(cfa));
338: #endif
339: #ifdef USE_TOS
340: *sp-- = TOS;
341: TOS = (Cell)PFA1(cfa);
342: #else
343: *--sp = (Cell)PFA1(cfa);
344: #endif
345: }
346: NEXT_P0;
347: NEXT;
348:
349: douser:
350: {
351: DOCFA;
352: #ifdef DEBUG
353: fprintf(stderr,"%08lx: user: %08lx\n",(Cell)ip,(Cell)PFA1(cfa));
354: #endif
355: #ifdef USE_TOS
356: *sp-- = TOS;
357: TOS = (Cell)(up+*(Cell*)PFA1(cfa));
358: #else
359: *--sp = (Cell)(up+*(Cell*)PFA1(cfa));
360: #endif
361: }
362: NEXT_P0;
363: NEXT;
364:
365: dodefer:
366: {
367: DOCFA;
368: #ifdef DEBUG
369: fprintf(stderr,"%08lx: defer: %08lx\n",(Cell)ip,*(Cell*)PFA1(cfa));
370: #endif
371: EXEC(*(Xt *)PFA1(cfa));
372: }
373:
374: dofield:
375: {
376: DOCFA;
377: #ifdef DEBUG
378: fprintf(stderr,"%08lx: field: %08lx\n",(Cell)ip,(Cell)PFA1(cfa));
379: #endif
380: TOS += *(Cell*)PFA1(cfa);
381: }
382: NEXT_P0;
383: NEXT;
384:
385: dodoes:
386: /* this assumes the following structure:
387: defining-word:
388:
389: ...
390: DOES>
391: (possible padding)
392: possibly handler: jmp dodoes
393: (possible branch delay slot(s))
394: Forth code after DOES>
395:
396: defined word:
397:
398: cfa: address of or jump to handler OR
399: address of or jump to dodoes, address of DOES-code
400: pfa:
401:
402: */
403: {
404: DOCFA;
405:
406: /* fprintf(stderr, "Got CFA %08lx at doescode %08lx/%08lx: does: %08lx\n",cfa,(Cell)ip,(Cell)PFA(cfa),(Cell)DOES_CODE1(cfa));*/
407: #ifdef DEBUG
408: fprintf(stderr,"%08lx/%08lx: does: %08lx\n",(Cell)ip,(Cell)PFA(cfa),(Cell)DOES_CODE1(cfa));
409: fflush(stderr);
410: #endif
411: *--rp = (Cell)ip;
412: /* PFA1 might collide with DOES_CODE1 here, so we use PFA */
413: ip = DOES_CODE1(cfa);
414: #ifdef USE_TOS
415: *sp-- = TOS;
416: TOS = (Cell)PFA(cfa);
417: #else
418: *--sp = (Cell)PFA(cfa);
419: #endif
420: /* fprintf(stderr,"TOS = %08lx, IP=%08lx\n", TOS, IP);*/
421: }
422: NEXT_P0;
423: NEXT;
424:
425: #include "prim.i"
426: }
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