Annotation of gforth/engine/engine.c, revision 1.23
1.1 anton 1: /* Gforth virtual machine (aka inner interpreter)
2:
1.22 anton 3: Copyright (C) 1995,1996,1997,1998,2000 Free Software Foundation, Inc.
1.1 anton 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
1.23 ! anton 19: Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111, USA.
1.1 anton 20: */
21:
22: #include "config.h"
23: #include <ctype.h>
24: #include <stdio.h>
25: #include <string.h>
26: #include <math.h>
1.4 pazsan 27: #include <assert.h>
28: #include <stdlib.h>
29: #include <errno.h>
30: #include "forth.h"
31: #include "io.h"
32: #include "threaded.h"
33: #ifndef STANDALONE
1.1 anton 34: #include <sys/types.h>
35: #include <sys/stat.h>
36: #include <fcntl.h>
37: #include <time.h>
38: #include <sys/time.h>
39: #include <unistd.h>
40: #include <pwd.h>
1.17 pazsan 41: #include <dirent.h>
1.21 anton 42: #include <sys/resource.h>
1.19 anton 43: #ifdef HAVE_FNMATCH_H
1.18 anton 44: #include <fnmatch.h>
1.19 anton 45: #else
46: #include "fnmatch.h"
47: #endif
1.4 pazsan 48: #else
49: #include "systypes.h"
50: #endif
1.1 anton 51:
52: #if defined(HAVE_LIBDL) || defined(HAVE_DLOPEN) /* what else? */
53: #include <dlfcn.h>
54: #endif
1.8 pazsan 55: #if defined(_WIN32)
56: #include <windows.h>
57: #endif
1.1 anton 58: #ifdef hpux
59: #include <dl.h>
60: #endif
61:
62: #ifndef SEEK_SET
63: /* should be defined in stdio.h, but some systems don't have it */
64: #define SEEK_SET 0
65: #endif
66:
67: #define IOR(flag) ((flag)? -512-errno : 0)
68:
1.4 pazsan 69: struct F83Name {
70: struct F83Name *next; /* the link field for old hands */
71: char countetc;
72: char name[0];
73: };
1.1 anton 74:
75: /* are macros for setting necessary? */
76: #define F83NAME_COUNT(np) ((np)->countetc & 0x1f)
77: #define F83NAME_SMUDGE(np) (((np)->countetc & 0x40) != 0)
78: #define F83NAME_IMMEDIATE(np) (((np)->countetc & 0x20) != 0)
79:
80: Cell *SP;
81: Float *FP;
82: Address UP=NULL;
83:
84: #if 0
85: /* not used currently */
86: int emitcounter;
87: #endif
88: #define NULLC '\0'
89:
1.14 pazsan 90: #ifdef MEMCMP_AS_SUBROUTINE
91: extern int gforth_memcmp(const char * s1, const char * s2, size_t n);
1.15 anton 92: #define memcmp(s1,s2,n) gforth_memcmp(s1,s2,n)
1.14 pazsan 93: #endif
94:
1.9 pazsan 95: #ifdef HAS_FILE
1.1 anton 96: char *cstr(Char *from, UCell size, int clear)
97: /* return a C-string corresponding to the Forth string ( FROM SIZE ).
98: the C-string lives until the next call of cstr with CLEAR being true */
99: {
100: static struct cstr_buffer {
101: char *buffer;
102: size_t size;
103: } *buffers=NULL;
104: static int nbuffers=0;
105: static int used=0;
106: struct cstr_buffer *b;
107:
108: if (buffers==NULL)
109: buffers=malloc(0);
110: if (clear)
111: used=0;
112: if (used>=nbuffers) {
113: buffers=realloc(buffers,sizeof(struct cstr_buffer)*(used+1));
114: buffers[used]=(struct cstr_buffer){malloc(0),0};
115: nbuffers=used+1;
116: }
117: b=&buffers[used];
118: if (size+1 > b->size) {
119: b->buffer = realloc(b->buffer,size+1);
120: b->size = size+1;
121: }
122: memcpy(b->buffer,from,size);
123: b->buffer[size]='\0';
124: used++;
125: return b->buffer;
126: }
127:
128: char *tilde_cstr(Char *from, UCell size, int clear)
129: /* like cstr(), but perform tilde expansion on the string */
130: {
131: char *s1,*s2;
132: int s1_len, s2_len;
133: struct passwd *getpwnam (), *user_entry;
134:
135: if (size<1 || from[0]!='~')
136: return cstr(from, size, clear);
137: if (size<2 || from[1]=='/') {
138: s1 = (char *)getenv ("HOME");
139: if(s1 == NULL)
140: s1 = "";
141: s2 = from+1;
142: s2_len = size-1;
143: } else {
144: UCell i;
145: for (i=1; i<size && from[i]!='/'; i++)
146: ;
1.13 anton 147: if (i==2 && from[1]=='+') /* deal with "~+", i.e., the wd */
148: return cstr(from+3, size<3?0:size-3,clear);
1.1 anton 149: {
150: char user[i];
151: memcpy(user,from+1,i-1);
152: user[i-1]='\0';
153: user_entry=getpwnam(user);
154: }
155: if (user_entry==NULL)
156: return cstr(from, size, clear);
157: s1 = user_entry->pw_dir;
158: s2 = from+i;
159: s2_len = size-i;
160: }
161: s1_len = strlen(s1);
162: if (s1_len>1 && s1[s1_len-1]=='/')
163: s1_len--;
164: {
165: char path[s1_len+s2_len];
166: memcpy(path,s1,s1_len);
167: memcpy(path+s1_len,s2,s2_len);
168: return cstr(path,s1_len+s2_len,clear);
169: }
170: }
1.9 pazsan 171: #endif
1.21 anton 172:
173: DCell timeval2us(struct timeval *tvp)
174: {
175: #ifndef BUGGY_LONG_LONG
176: return (tvp->tv_sec*(DCell)1000000)+tvp->tv_usec;
177: #else
178: DCell d2;
179: DCell d1=mmul(tvp->tv_sec,1000000);
180: d2.lo = d1.lo+tvp->tv_usec;
181: d2.hi = d1.hi + (d2.lo<d1.lo);
182: return d2;
183: #endif
184: }
1.1 anton 185:
186: #define NEWLINE '\n'
187:
188: #ifndef HAVE_RINT
189: #define rint(x) floor((x)+0.5)
190: #endif
191:
1.9 pazsan 192: #ifdef HAS_FILE
1.16 anton 193: static char* fileattr[6]={"rb","rb","r+b","r+b","wb","wb"};
1.1 anton 194:
195: #ifndef O_BINARY
196: #define O_BINARY 0
197: #endif
198: #ifndef O_TEXT
199: #define O_TEXT 0
200: #endif
201:
202: static int ufileattr[6]= {
1.16 anton 203: O_RDONLY|O_BINARY, O_RDONLY|O_BINARY,
204: O_RDWR |O_BINARY, O_RDWR |O_BINARY,
205: O_WRONLY|O_BINARY, O_WRONLY|O_BINARY };
1.9 pazsan 206: #endif
1.1 anton 207:
208: /* if machine.h has not defined explicit registers, define them as implicit */
209: #ifndef IPREG
210: #define IPREG
211: #endif
212: #ifndef SPREG
213: #define SPREG
214: #endif
215: #ifndef RPREG
216: #define RPREG
217: #endif
218: #ifndef FPREG
219: #define FPREG
220: #endif
221: #ifndef LPREG
222: #define LPREG
223: #endif
224: #ifndef CFAREG
225: #define CFAREG
226: #endif
227: #ifndef UPREG
228: #define UPREG
229: #endif
230: #ifndef TOSREG
231: #define TOSREG
232: #endif
233: #ifndef FTOSREG
234: #define FTOSREG
235: #endif
236:
237: #ifndef CPU_DEP1
238: # define CPU_DEP1 0
239: #endif
240:
241: /* declare and compute cfa for certain threading variants */
242: /* warning: this is nonsyntactical; it will not work in place of a statement */
1.12 anton 243: #ifndef GETCFA
1.1 anton 244: #define DOCFA
245: #else
246: #define DOCFA Xt cfa; GETCFA(cfa)
247: #endif
248:
1.10 anton 249: #ifdef GFORTH_DEBUGGING
250: /* define some VM registers as global variables, so they survive exceptions;
251: global register variables are not up to the task (according to the
252: GNU C manual) */
253: Xt *ip;
254: Cell *rp;
255: #endif
256:
1.1 anton 257: Label *engine(Xt *ip0, Cell *sp0, Cell *rp0, Float *fp0, Address lp0)
258: /* executes code at ip, if ip!=NULL
259: returns array of machine code labels (for use in a loader), if ip==NULL
260: */
261: {
1.10 anton 262: #ifndef GFORTH_DEBUGGING
263: register Xt *ip IPREG;
264: register Cell *rp RPREG;
265: #endif
1.1 anton 266: register Cell *sp SPREG = sp0;
267: register Float *fp FPREG = fp0;
268: register Address lp LPREG = lp0;
269: #ifdef CFA_NEXT
270: register Xt cfa CFAREG;
271: #endif
1.11 anton 272: #ifdef MORE_VARS
273: MORE_VARS
274: #endif
1.1 anton 275: register Address up UPREG = UP;
276: IF_TOS(register Cell TOS TOSREG;)
277: IF_FTOS(register Float FTOS FTOSREG;)
278: #if defined(DOUBLY_INDIRECT)
279: static Label *symbols;
280: static void *routines[]= {
281: #else /* !defined(DOUBLY_INDIRECT) */
282: static Label symbols[]= {
283: #endif /* !defined(DOUBLY_INDIRECT) */
1.4 pazsan 284: (Label)&&docol,
285: (Label)&&docon,
286: (Label)&&dovar,
287: (Label)&&douser,
288: (Label)&&dodefer,
289: (Label)&&dofield,
290: (Label)&&dodoes,
1.1 anton 291: /* the following entry is normally unused;
292: it's there because its index indicates a does-handler */
1.7 pazsan 293: CPU_DEP1,
1.1 anton 294: #include "prim_lab.i"
1.4 pazsan 295: (Label)0
1.1 anton 296: };
297: #ifdef CPU_DEP2
298: CPU_DEP2
299: #endif
300:
1.10 anton 301: ip = ip0;
302: rp = rp0;
1.1 anton 303: #ifdef DEBUG
304: fprintf(stderr,"ip=%x, sp=%x, rp=%x, fp=%x, lp=%x, up=%x\n",
305: (unsigned)ip,(unsigned)sp,(unsigned)rp,
306: (unsigned)fp,(unsigned)lp,(unsigned)up);
307: #endif
308:
309: if (ip == NULL) {
310: #if defined(DOUBLY_INDIRECT)
1.3 anton 311: #define MAX_SYMBOLS (sizeof(routines)/sizeof(routines[0]))
312: #define CODE_OFFSET (22*sizeof(Cell))
1.1 anton 313: int i;
1.3 anton 314: Cell code_offset = offset_image? CODE_OFFSET : 0;
1.7 pazsan 315:
1.3 anton 316: symbols = (Label *)(malloc(MAX_SYMBOLS*sizeof(Cell)+CODE_OFFSET)+code_offset);
1.1 anton 317: for (i=0; i<DOESJUMP+1; i++)
1.7 pazsan 318: symbols[i] = (Label)routines[i];
1.1 anton 319: for (; routines[i]!=0; i++) {
320: if (i>=MAX_SYMBOLS) {
321: fprintf(stderr,"gforth-ditc: more than %d primitives\n",MAX_SYMBOLS);
322: exit(1);
1.20 anton 323: }
324: symbols[i] = &routines[i];
1.1 anton 325: }
1.20 anton 326: #endif /* defined(DOUBLY_INDIRECT) */
327: return symbols;
1.7 pazsan 328: }
1.1 anton 329:
330: IF_TOS(TOS = sp[0]);
331: IF_FTOS(FTOS = fp[0]);
1.7 pazsan 332: /* prep_terminal(); */
1.11 anton 333: SET_IP(ip);
1.1 anton 334: NEXT;
335:
1.11 anton 336:
1.1 anton 337: #ifdef CPU_DEP3
338: CPU_DEP3
339: #endif
340:
341: docol:
342: {
343: DOCFA;
344: #ifdef DEBUG
345: fprintf(stderr,"%08lx: col: %08lx\n",(Cell)ip,(Cell)PFA1(cfa));
346: #endif
347: #ifdef CISC_NEXT
348: /* this is the simple version */
349: *--rp = (Cell)ip;
1.11 anton 350: SET_IP((Xt *)PFA1(cfa));
1.1 anton 351: NEXT;
352: #else
1.11 anton 353: /* this one is important, so we help the compiler optimizing */
1.1 anton 354: {
355: DEF_CA
1.11 anton 356: rp[-1] = (Cell)ip;
357: SET_IP((Xt *)PFA1(cfa));
358: NEXT_P1;
359: rp--;
360: NEXT_P2;
1.1 anton 361: }
362: #endif
363: }
364:
365: docon:
366: {
367: DOCFA;
368: #ifdef DEBUG
369: fprintf(stderr,"%08lx: con: %08lx\n",(Cell)ip,*(Cell*)PFA1(cfa));
370: #endif
371: #ifdef USE_TOS
372: *sp-- = TOS;
373: TOS = *(Cell *)PFA1(cfa);
374: #else
375: *--sp = *(Cell *)PFA1(cfa);
376: #endif
377: }
378: NEXT_P0;
379: NEXT;
380:
381: dovar:
382: {
383: DOCFA;
384: #ifdef DEBUG
385: fprintf(stderr,"%08lx: var: %08lx\n",(Cell)ip,(Cell)PFA1(cfa));
386: #endif
387: #ifdef USE_TOS
388: *sp-- = TOS;
389: TOS = (Cell)PFA1(cfa);
390: #else
391: *--sp = (Cell)PFA1(cfa);
392: #endif
393: }
394: NEXT_P0;
395: NEXT;
396:
397: douser:
398: {
399: DOCFA;
400: #ifdef DEBUG
401: fprintf(stderr,"%08lx: user: %08lx\n",(Cell)ip,(Cell)PFA1(cfa));
402: #endif
403: #ifdef USE_TOS
404: *sp-- = TOS;
405: TOS = (Cell)(up+*(Cell*)PFA1(cfa));
406: #else
407: *--sp = (Cell)(up+*(Cell*)PFA1(cfa));
408: #endif
409: }
410: NEXT_P0;
411: NEXT;
412:
413: dodefer:
414: {
415: DOCFA;
416: #ifdef DEBUG
417: fprintf(stderr,"%08lx: defer: %08lx\n",(Cell)ip,*(Cell*)PFA1(cfa));
418: #endif
419: EXEC(*(Xt *)PFA1(cfa));
420: }
421:
422: dofield:
423: {
424: DOCFA;
425: #ifdef DEBUG
426: fprintf(stderr,"%08lx: field: %08lx\n",(Cell)ip,(Cell)PFA1(cfa));
427: #endif
1.11 anton 428: TOS += *(Cell*)PFA1(cfa);
1.1 anton 429: }
430: NEXT_P0;
431: NEXT;
432:
433: dodoes:
434: /* this assumes the following structure:
435: defining-word:
436:
437: ...
438: DOES>
439: (possible padding)
440: possibly handler: jmp dodoes
441: (possible branch delay slot(s))
442: Forth code after DOES>
443:
444: defined word:
445:
446: cfa: address of or jump to handler OR
447: address of or jump to dodoes, address of DOES-code
448: pfa:
449:
450: */
451: {
452: DOCFA;
453:
454: /* fprintf(stderr, "Got CFA %08lx at doescode %08lx/%08lx: does: %08lx\n",cfa,(Cell)ip,(Cell)PFA(cfa),(Cell)DOES_CODE1(cfa));*/
455: #ifdef DEBUG
456: fprintf(stderr,"%08lx/%08lx: does: %08lx\n",(Cell)ip,(Cell)PFA(cfa),(Cell)DOES_CODE1(cfa));
457: fflush(stderr);
458: #endif
459: *--rp = (Cell)ip;
460: /* PFA1 might collide with DOES_CODE1 here, so we use PFA */
461: #ifdef USE_TOS
462: *sp-- = TOS;
463: TOS = (Cell)PFA(cfa);
464: #else
465: *--sp = (Cell)PFA(cfa);
466: #endif
1.11 anton 467: SET_IP(DOES_CODE1(cfa));
1.1 anton 468: /* fprintf(stderr,"TOS = %08lx, IP=%08lx\n", TOS, IP);*/
469: }
470: NEXT;
471:
472: #include "prim.i"
473: }
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