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