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