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