Annotation of gforth/engine/engine.c, revision 1.8
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>
1.4 pazsan 41: #else
42: #include "systypes.h"
43: #endif
1.1 anton 44:
45: #if defined(HAVE_LIBDL) || defined(HAVE_DLOPEN) /* what else? */
46: #include <dlfcn.h>
47: #endif
1.8 ! pazsan 48: #if defined(_WIN32)
! 49: #include <windows.h>
! 50: #endif
1.1 anton 51: #ifdef hpux
52: #include <dl.h>
53: #endif
54:
55: #ifndef SEEK_SET
56: /* should be defined in stdio.h, but some systems don't have it */
57: #define SEEK_SET 0
58: #endif
59:
60: #define IOR(flag) ((flag)? -512-errno : 0)
61:
1.4 pazsan 62: struct F83Name {
63: struct F83Name *next; /* the link field for old hands */
64: char countetc;
65: char name[0];
66: };
1.1 anton 67:
68: /* are macros for setting necessary? */
69: #define F83NAME_COUNT(np) ((np)->countetc & 0x1f)
70: #define F83NAME_SMUDGE(np) (((np)->countetc & 0x40) != 0)
71: #define F83NAME_IMMEDIATE(np) (((np)->countetc & 0x20) != 0)
72:
73: Cell *SP;
74: Float *FP;
75: Address UP=NULL;
76:
77: #if 0
78: /* not used currently */
79: int emitcounter;
80: #endif
81: #define NULLC '\0'
82:
83: char *cstr(Char *from, UCell size, int clear)
84: /* return a C-string corresponding to the Forth string ( FROM SIZE ).
85: the C-string lives until the next call of cstr with CLEAR being true */
86: {
87: static struct cstr_buffer {
88: char *buffer;
89: size_t size;
90: } *buffers=NULL;
91: static int nbuffers=0;
92: static int used=0;
93: struct cstr_buffer *b;
94:
95: if (buffers==NULL)
96: buffers=malloc(0);
97: if (clear)
98: used=0;
99: if (used>=nbuffers) {
100: buffers=realloc(buffers,sizeof(struct cstr_buffer)*(used+1));
101: buffers[used]=(struct cstr_buffer){malloc(0),0};
102: nbuffers=used+1;
103: }
104: b=&buffers[used];
105: if (size+1 > b->size) {
106: b->buffer = realloc(b->buffer,size+1);
107: b->size = size+1;
108: }
109: memcpy(b->buffer,from,size);
110: b->buffer[size]='\0';
111: used++;
112: return b->buffer;
113: }
114:
1.4 pazsan 115: #ifdef STANDALONE
116: char *tilde_cstr(Char *from, UCell size, int clear)
117: {
118: return cstr(from, size, clear);
119: }
120: #else
1.1 anton 121: char *tilde_cstr(Char *from, UCell size, int clear)
122: /* like cstr(), but perform tilde expansion on the string */
123: {
124: char *s1,*s2;
125: int s1_len, s2_len;
126: struct passwd *getpwnam (), *user_entry;
127:
128: if (size<1 || from[0]!='~')
129: return cstr(from, size, clear);
130: if (size<2 || from[1]=='/') {
131: s1 = (char *)getenv ("HOME");
132: if(s1 == NULL)
133: s1 = "";
134: s2 = from+1;
135: s2_len = size-1;
136: } else {
137: UCell i;
138: for (i=1; i<size && from[i]!='/'; i++)
139: ;
140: {
141: char user[i];
142: memcpy(user,from+1,i-1);
143: user[i-1]='\0';
144: user_entry=getpwnam(user);
145: }
146: if (user_entry==NULL)
147: return cstr(from, size, clear);
148: s1 = user_entry->pw_dir;
149: s2 = from+i;
150: s2_len = size-i;
151: }
152: s1_len = strlen(s1);
153: if (s1_len>1 && s1[s1_len-1]=='/')
154: s1_len--;
155: {
156: char path[s1_len+s2_len];
157: memcpy(path,s1,s1_len);
158: memcpy(path+s1_len,s2,s2_len);
159: return cstr(path,s1_len+s2_len,clear);
160: }
161: }
1.4 pazsan 162: #endif
1.1 anton 163:
164: #define NEWLINE '\n'
165:
166: #ifndef HAVE_RINT
167: #define rint(x) floor((x)+0.5)
168: #endif
169:
170: static char* fileattr[6]={"r","rb","r+","r+b","w","wb"};
171:
172: #ifndef O_BINARY
173: #define O_BINARY 0
174: #endif
175: #ifndef O_TEXT
176: #define O_TEXT 0
177: #endif
178:
179: static int ufileattr[6]= {
180: O_RDONLY|O_TEXT, O_RDONLY|O_BINARY,
181: O_RDWR |O_TEXT, O_RDWR |O_BINARY,
182: O_WRONLY|O_TEXT, O_WRONLY|O_BINARY };
183:
184: /* if machine.h has not defined explicit registers, define them as implicit */
185: #ifndef IPREG
186: #define IPREG
187: #endif
188: #ifndef SPREG
189: #define SPREG
190: #endif
191: #ifndef RPREG
192: #define RPREG
193: #endif
194: #ifndef FPREG
195: #define FPREG
196: #endif
197: #ifndef LPREG
198: #define LPREG
199: #endif
200: #ifndef CFAREG
201: #define CFAREG
202: #endif
203: #ifndef UPREG
204: #define UPREG
205: #endif
206: #ifndef TOSREG
207: #define TOSREG
208: #endif
209: #ifndef FTOSREG
210: #define FTOSREG
211: #endif
212:
213: #ifndef CPU_DEP1
214: # define CPU_DEP1 0
215: #endif
216:
217: /* declare and compute cfa for certain threading variants */
218: /* warning: this is nonsyntactical; it will not work in place of a statement */
219: #ifdef CFA_NEXT
220: #define DOCFA
221: #else
222: #define DOCFA Xt cfa; GETCFA(cfa)
223: #endif
224:
225: Label *engine(Xt *ip0, Cell *sp0, Cell *rp0, Float *fp0, Address lp0)
226: /* executes code at ip, if ip!=NULL
227: returns array of machine code labels (for use in a loader), if ip==NULL
228: */
229: {
230: register Xt *ip IPREG = ip0;
231: register Cell *sp SPREG = sp0;
232: register Cell *rp RPREG = rp0;
233: register Float *fp FPREG = fp0;
234: register Address lp LPREG = lp0;
235: #ifdef CFA_NEXT
236: register Xt cfa CFAREG;
237: #endif
238: register Address up UPREG = UP;
239: IF_TOS(register Cell TOS TOSREG;)
240: IF_FTOS(register Float FTOS FTOSREG;)
241: #if defined(DOUBLY_INDIRECT)
242: static Label *symbols;
243: static void *routines[]= {
244: #else /* !defined(DOUBLY_INDIRECT) */
245: static Label symbols[]= {
246: #endif /* !defined(DOUBLY_INDIRECT) */
1.4 pazsan 247: (Label)&&docol,
248: (Label)&&docon,
249: (Label)&&dovar,
250: (Label)&&douser,
251: (Label)&&dodefer,
252: (Label)&&dofield,
253: (Label)&&dodoes,
1.1 anton 254: /* the following entry is normally unused;
255: it's there because its index indicates a does-handler */
1.7 pazsan 256: CPU_DEP1,
1.1 anton 257: #include "prim_lab.i"
1.4 pazsan 258: (Label)0
1.1 anton 259: };
260: #ifdef CPU_DEP2
261: CPU_DEP2
262: #endif
263:
264: #ifdef DEBUG
265: fprintf(stderr,"ip=%x, sp=%x, rp=%x, fp=%x, lp=%x, up=%x\n",
266: (unsigned)ip,(unsigned)sp,(unsigned)rp,
267: (unsigned)fp,(unsigned)lp,(unsigned)up);
268: #endif
269:
270: if (ip == NULL) {
271: #if defined(DOUBLY_INDIRECT)
1.3 anton 272: #define MAX_SYMBOLS (sizeof(routines)/sizeof(routines[0]))
273: #define CODE_OFFSET (22*sizeof(Cell))
1.1 anton 274: int i;
1.3 anton 275: Cell code_offset = offset_image? CODE_OFFSET : 0;
1.7 pazsan 276:
1.3 anton 277: symbols = (Label *)(malloc(MAX_SYMBOLS*sizeof(Cell)+CODE_OFFSET)+code_offset);
1.1 anton 278: for (i=0; i<DOESJUMP+1; i++)
1.7 pazsan 279: symbols[i] = (Label)routines[i];
1.1 anton 280: for (; routines[i]!=0; i++) {
281: if (i>=MAX_SYMBOLS) {
282: fprintf(stderr,"gforth-ditc: more than %d primitives\n",MAX_SYMBOLS);
283: exit(1);
284: }
1.7 pazsan 285: symbols[i] = &routines[i];
286: }
1.5 pazsan 287: #endif /* defined(DOUBLY_INDIRECT) */
1.7 pazsan 288: return symbols;
289: }
1.1 anton 290:
291: IF_TOS(TOS = sp[0]);
292: IF_FTOS(FTOS = fp[0]);
1.7 pazsan 293: /* prep_terminal(); */
1.1 anton 294: NEXT_P0;
295: NEXT;
296:
297: #ifdef CPU_DEP3
298: CPU_DEP3
299: #endif
300:
301: docol:
302: {
303: DOCFA;
304: #ifdef DEBUG
305: fprintf(stderr,"%08lx: col: %08lx\n",(Cell)ip,(Cell)PFA1(cfa));
306: #endif
307: #ifdef CISC_NEXT
308: /* this is the simple version */
309: *--rp = (Cell)ip;
310: ip = (Xt *)PFA1(cfa);
311: NEXT_P0;
312: NEXT;
313: #else
314: /* this one is important, so we help the compiler optimizing
315: The following version may be better (for scheduling), but probably has
316: problems with code fields employing calls and delay slots
317: */
318: {
319: DEF_CA
320: Xt *current_ip = (Xt *)PFA1(cfa);
321: cfa = *current_ip;
322: NEXT1_P1;
323: *--rp = (Cell)ip;
324: ip = current_ip+1;
325: NEXT1_P2;
326: }
327: #endif
328: }
329:
330: docon:
331: {
332: DOCFA;
333: #ifdef DEBUG
334: fprintf(stderr,"%08lx: con: %08lx\n",(Cell)ip,*(Cell*)PFA1(cfa));
335: #endif
336: #ifdef USE_TOS
337: *sp-- = TOS;
338: TOS = *(Cell *)PFA1(cfa);
339: #else
340: *--sp = *(Cell *)PFA1(cfa);
341: #endif
342: }
343: NEXT_P0;
344: NEXT;
345:
346: dovar:
347: {
348: DOCFA;
349: #ifdef DEBUG
350: fprintf(stderr,"%08lx: var: %08lx\n",(Cell)ip,(Cell)PFA1(cfa));
351: #endif
352: #ifdef USE_TOS
353: *sp-- = TOS;
354: TOS = (Cell)PFA1(cfa);
355: #else
356: *--sp = (Cell)PFA1(cfa);
357: #endif
358: }
359: NEXT_P0;
360: NEXT;
361:
362: douser:
363: {
364: DOCFA;
365: #ifdef DEBUG
366: fprintf(stderr,"%08lx: user: %08lx\n",(Cell)ip,(Cell)PFA1(cfa));
367: #endif
368: #ifdef USE_TOS
369: *sp-- = TOS;
370: TOS = (Cell)(up+*(Cell*)PFA1(cfa));
371: #else
372: *--sp = (Cell)(up+*(Cell*)PFA1(cfa));
373: #endif
374: }
375: NEXT_P0;
376: NEXT;
377:
378: dodefer:
379: {
380: DOCFA;
381: #ifdef DEBUG
382: fprintf(stderr,"%08lx: defer: %08lx\n",(Cell)ip,*(Cell*)PFA1(cfa));
383: #endif
384: EXEC(*(Xt *)PFA1(cfa));
385: }
386:
387: dofield:
388: {
389: DOCFA;
390: #ifdef DEBUG
391: fprintf(stderr,"%08lx: field: %08lx\n",(Cell)ip,(Cell)PFA1(cfa));
392: #endif
393: TOS += *(Cell*)PFA1(cfa);
394: }
395: NEXT_P0;
396: NEXT;
397:
398: dodoes:
399: /* this assumes the following structure:
400: defining-word:
401:
402: ...
403: DOES>
404: (possible padding)
405: possibly handler: jmp dodoes
406: (possible branch delay slot(s))
407: Forth code after DOES>
408:
409: defined word:
410:
411: cfa: address of or jump to handler OR
412: address of or jump to dodoes, address of DOES-code
413: pfa:
414:
415: */
416: {
417: DOCFA;
418:
419: /* fprintf(stderr, "Got CFA %08lx at doescode %08lx/%08lx: does: %08lx\n",cfa,(Cell)ip,(Cell)PFA(cfa),(Cell)DOES_CODE1(cfa));*/
420: #ifdef DEBUG
421: fprintf(stderr,"%08lx/%08lx: does: %08lx\n",(Cell)ip,(Cell)PFA(cfa),(Cell)DOES_CODE1(cfa));
422: fflush(stderr);
423: #endif
424: *--rp = (Cell)ip;
425: /* PFA1 might collide with DOES_CODE1 here, so we use PFA */
426: ip = DOES_CODE1(cfa);
427: #ifdef USE_TOS
428: *sp-- = TOS;
429: TOS = (Cell)PFA(cfa);
430: #else
431: *--sp = (Cell)PFA(cfa);
432: #endif
433: /* fprintf(stderr,"TOS = %08lx, IP=%08lx\n", TOS, IP);*/
434: }
435: NEXT_P0;
436: NEXT;
437:
438: #include "prim.i"
439: }
FreeBSD-CVSweb <freebsd-cvsweb@FreeBSD.org>